DirContext (Java SE 26 & JDK 26)
Description: declaration: module: java.naming, package: javax.naming.directory, interface: DirContext
Keywords: javax.naming.directory.DirContext interface

# Interface DirContext

All Superinterfaces:
  `Context`

All Known Subinterfaces:
  `EventDirContext, LdapContext`

All Known Implementing Classes:
  `InitialDirContext, InitialLdapContext`

public interface DirContext extends Context
The directory service interface, containing methods for examining and updating attributes associated with objects, and for searching the directory.

## Names

Each name passed as an argument to a `DirContext` method is relative to that context. The empty name is used to name the context itself. The name parameter may never be null.

Most of the methods have overloaded versions with one taking a `Name` parameter and one taking a `String`. These overloaded versions are equivalent in that if the `Name` and `String` parameters are just different representations of the same name, then the overloaded versions of the same methods behave the same. In the method descriptions below, only one version is documented. The second version instead has a link to the first: the same documentation applies to both.

See `Context` for a discussion on the interpretation of the name argument to the `Context` methods. These same rules apply to the name argument to the `DirContext` methods.

## Attribute Models

There are two basic models of what attributes should be associated with. First, attributes may be directly associated with a DirContext object. In this model, an attribute operation on the named object is roughly equivalent to a lookup on the name (which returns the DirContext object), followed by the attribute operation invoked on the DirContext object in which the caller supplies an empty name. The attributes can be viewed as being stored along with the object (note that this does not imply that the implementation must do so).

The second model is that attributes are associated with a name (typically an atomic name) in a DirContext. In this model, an attribute operation on the named object is roughly equivalent to a lookup on the name of the parent DirContext of the named object, followed by the attribute operation invoked on the parent in which the caller supplies the terminal atomic name. The attributes can be viewed as being stored in the parent DirContext (again, this does not imply that the implementation must do so). Objects that are not DirContexts can have attributes, as long as their parents are DirContexts.

JNDI support both of these models. It is up to the individual service providers to decide where to "store" attributes. JNDI clients are safest when they do not make assumptions about whether an object's attributes are stored as part of the object, or stored within the parent object and associated with the object's name.

## Attribute Type Names

In the `getAttributes()` and `search()` methods, you can supply the attributes to return by supplying a list of attribute names (strings). The attributes that you get back might not have the same names as the attribute names you have specified. This is because some directories support features that cause them to return other attributes. Such features include attribute subclassing, attribute name synonyms, and attribute language codes.

In attribute subclassing, attributes are defined in a class hierarchy. In some directories, for example, the "name" attribute might be the superclass of all name-related attributes, including "commonName" and "surName". Asking for the "name" attribute might return both the "commonName" and "surName" attributes.

With attribute type synonyms, a directory can assign multiple names to the same attribute. For example, "cn" and "commonName" might both refer to the same attribute. Asking for "cn" might return the "commonName" attribute.

Some directories support the language codes for attributes. Asking such a directory for the "description" attribute, for example, might return all of the following attributes:

- description
- description;lang-en
- description;lang-de
- description;lang-fr

## Operational Attributes

Some directories have the notion of "operational attributes" which are attributes associated with a directory object for administrative purposes. An example of operational attributes is the access control list for an object.

In the `getAttributes()` and `search()` methods, you can specify that all attributes associated with the requested objects be returned by supply `null` as the list of attributes to return. The attributes returned do not include operational attributes. In order to retrieve operational attributes, you must name them explicitly.

## Named Context

There are certain methods in which the name must resolve to a context (for example, when searching a single level context). The documentation of such methods use the term named context to describe their name parameter. For these methods, if the named object is not a DirContext, `NotContextException` is thrown. Aside from these methods, there is no requirement that the named object be a DirContext.

## Parameters

An `Attributes`, `SearchControls`, or array object passed as a parameter to any method will not be modified by the service provider. The service provider may keep a reference to it for the duration of the operation, including any enumeration of the method's results and the processing of any referrals generated. The caller should not modify the object during this time. An `Attributes` object returned by any method is owned by the caller. The caller may subsequently modify it; the service provider will not.

## Exceptions

All the methods in this interface can throw a NamingException or any of its subclasses. See NamingException and their subclasses for details on each exception.

Since:
  1.3
See Also:
  - `Context`

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final int`
  `ADD_ATTRIBUTE`
  This constant specifies to add an attribute with the specified values.
  `static final int`
  `REMOVE_ATTRIBUTE`
  This constant specifies to delete the specified attribute values from the attribute.
  `static final int`
  `REPLACE_ATTRIBUTE`
  This constant specifies to replace an attribute with specified values.

  ### Fields declared in interface Context

  `AUTHORITATIVE, BATCHSIZE, DNS_URL, INITIAL_CONTEXT_FACTORY, LANGUAGE, OBJECT_FACTORIES, PROVIDER_URL, REFERRAL, SECURITY_AUTHENTICATION, SECURITY_CREDENTIALS, SECURITY_PRINCIPAL, SECURITY_PROTOCOL, STATE_FACTORIES, URL_PKG_PREFIXES`
  Modifier and Type
  Field
  Description
  `static final String`
  `AUTHORITATIVE`
  Constant that holds the name of the environment property for specifying the authoritativeness of the service requested.
  `static final String`
  `BATCHSIZE`
  Constant that holds the name of the environment property for specifying the batch size to use when returning data via the service's protocol.
  `static final String`
  `DNS_URL`
  Constant that holds the name of the environment property for specifying the DNS host and domain names to use for the JNDI URL context (for example, "dns://somehost/wiz.com").
  `static final String`
  `INITIAL_CONTEXT_FACTORY`
  Constant that holds the name of the environment property for specifying the initial context factory to use.
  `static final String`
  `LANGUAGE`
  Constant that holds the name of the environment property for specifying the preferred language to use with the service.
  `static final String`
  `OBJECT_FACTORIES`
  Constant that holds the name of the environment property for specifying the list of object factories to use.
  `static final String`
  `PROVIDER_URL`
  Constant that holds the name of the environment property for specifying configuration information for the service provider to use.
  `static final String`
  `REFERRAL`
  Constant that holds the name of the environment property for specifying how referrals encountered by the service provider are to be processed.
  `static final String`
  `SECURITY_AUTHENTICATION`
  Constant that holds the name of the environment property for specifying the security level to use.
  `static final String`
  `SECURITY_CREDENTIALS`
  Constant that holds the name of the environment property for specifying the credentials of the principal for authenticating the caller to the service.
  `static final String`
  `SECURITY_PRINCIPAL`
  Constant that holds the name of the environment property for specifying the identity of the principal for authenticating the caller to the service.
  `static final String`
  `SECURITY_PROTOCOL`
  Constant that holds the name of the environment property for specifying the security protocol to use.
  `static final String`
  `STATE_FACTORIES`
  Constant that holds the name of the environment property for specifying the list of state factories to use.
  `static final String`
  `URL_PKG_PREFIXES`
  Constant that holds the name of the environment property for specifying the list of package prefixes to use when loading in URL context factories.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `bind(String name, Object obj, Attributes attrs)`
  Binds a name to an object, along with associated attributes.
  `void`
  `bind(Name name, Object obj, Attributes attrs)`
  Binds a name to an object, along with associated attributes.
  `DirContext`
  `createSubcontext(String name, Attributes attrs)`
  Creates and binds a new context, along with associated attributes.
  `DirContext`
  `createSubcontext(Name name, Attributes attrs)`
  Creates and binds a new context, along with associated attributes.
  `Attributes`
  `getAttributes(String name)`
  Retrieves all of the attributes associated with a named object.
  `Attributes`
  `getAttributes(String name, String[] attrIds)`
  Retrieves selected attributes associated with a named object.
  `Attributes`
  `getAttributes(Name name)`
  Retrieves all of the attributes associated with a named object.
  `Attributes`
  `getAttributes(Name name, String[] attrIds)`
  Retrieves selected attributes associated with a named object.
  `DirContext`
  `getSchema(String name)`
  Retrieves the schema associated with the named object.
  `DirContext`
  `getSchema(Name name)`
  Retrieves the schema associated with the named object.
  `DirContext`
  `getSchemaClassDefinition(String name)`
  Retrieves a context containing the schema objects of the named object's class definitions.
  `DirContext`
  `getSchemaClassDefinition(Name name)`
  Retrieves a context containing the schema objects of the named object's class definitions.
  `void`
  `modifyAttributes(String name, int mod_op, Attributes attrs)`
  Modifies the attributes associated with a named object.
  `void`
  `modifyAttributes(String name, ModificationItem[] mods)`
  Modifies the attributes associated with a named object using an ordered list of modifications.
  `void`
  `modifyAttributes(Name name, int mod_op, Attributes attrs)`
  Modifies the attributes associated with a named object.
  `void`
  `modifyAttributes(Name name, ModificationItem[] mods)`
  Modifies the attributes associated with a named object using an ordered list of modifications.
  `void`
  `rebind(String name, Object obj, Attributes attrs)`
  Binds a name to an object, along with associated attributes, overwriting any existing binding.
  `void`
  `rebind(Name name, Object obj, Attributes attrs)`
  Binds a name to an object, along with associated attributes, overwriting any existing binding.
  `NamingEnumeration<SearchResult>`
  `search(String name, String filterExpr, Object[] filterArgs, SearchControls cons)`
  Searches in the named context or object for entries that satisfy the given search filter.
  `NamingEnumeration<SearchResult>`
  `search(String name, String filter, SearchControls cons)`
  Searches in the named context or object for entries that satisfy the given search filter.
  `NamingEnumeration<SearchResult>`
  `search(String name, Attributes matchingAttributes)`
  Searches in a single context for objects that contain a specified set of attributes.
  `NamingEnumeration<SearchResult>`
  `search(String name, Attributes matchingAttributes, String[] attributesToReturn)`
  Searches in a single context for objects that contain a specified set of attributes, and retrieves selected attributes.
  `NamingEnumeration<SearchResult>`
  `search(Name name, String filterExpr, Object[] filterArgs, SearchControls cons)`
  Searches in the named context or object for entries that satisfy the given search filter.
  `NamingEnumeration<SearchResult>`
  `search(Name name, String filter, SearchControls cons)`
  Searches in the named context or object for entries that satisfy the given search filter.
  `NamingEnumeration<SearchResult>`
  `search(Name name, Attributes matchingAttributes)`
  Searches in a single context for objects that contain a specified set of attributes.
  `NamingEnumeration<SearchResult>`
  `search(Name name, Attributes matchingAttributes, String[] attributesToReturn)`
  Searches in a single context for objects that contain a specified set of attributes, and retrieves selected attributes.

  ### Methods declared in interface Context

  `addToEnvironment, bind, bind, close, composeName, composeName, createSubcontext, createSubcontext, destroySubcontext, destroySubcontext, getEnvironment, getNameInNamespace, getNameParser, getNameParser, list, list, listBindings, listBindings, lookup, lookup, lookupLink, lookupLink, rebind, rebind, removeFromEnvironment, rename, rename, unbind, unbind`
  Modifier and Type
  Method
  Description
  `Object`
  `addToEnvironment(String propName, Object propVal)`
  Adds a new environment property to the environment of this context.
  `void`
  `bind(String name, Object obj)`
  Binds a name to an object.
  `void`
  `bind(Name name, Object obj)`
  Binds a name to an object.
  `void`
  `close()`
  Closes this context.
  `String`
  `composeName(String name, String prefix)`
  Composes the name of this context with a name relative to this context.
  `Name`
  `composeName(Name name, Name prefix)`
  Composes the name of this context with a name relative to this context.
  `Context`
  `createSubcontext(String name)`
  Creates and binds a new context.
  `Context`
  `createSubcontext(Name name)`
  Creates and binds a new context.
  `void`
  `destroySubcontext(String name)`
  Destroys the named context and removes it from the namespace.
  `void`
  `destroySubcontext(Name name)`
  Destroys the named context and removes it from the namespace.
  `Hashtable<?,?>`
  `getEnvironment()`
  Retrieves the environment in effect for this context.
  `String`
  `getNameInNamespace()`
  Retrieves the full name of this context within its own namespace.
  `NameParser`
  `getNameParser(String name)`
  Retrieves the parser associated with the named context.
  `NameParser`
  `getNameParser(Name name)`
  Retrieves the parser associated with the named context.
  `NamingEnumeration<NameClassPair>`
  `list(String name)`
  Enumerates the names bound in the named context, along with the class names of objects bound to them.
  `NamingEnumeration<NameClassPair>`
  `list(Name name)`
  Enumerates the names bound in the named context, along with the class names of objects bound to them.
  `NamingEnumeration<Binding>`
  `listBindings(String name)`
  Enumerates the names bound in the named context, along with the objects bound to them.
  `NamingEnumeration<Binding>`
  `listBindings(Name name)`
  Enumerates the names bound in the named context, along with the objects bound to them.
  `Object`
  `lookup(String name)`
  Retrieves the named object.
  `Object`
  `lookup(Name name)`
  Retrieves the named object.
  `Object`
  `lookupLink(String name)`
  Retrieves the named object, following links except for the terminal atomic component of the name.
  `Object`
  `lookupLink(Name name)`
  Retrieves the named object, following links except for the terminal atomic component of the name.
  `void`
  `rebind(String name, Object obj)`
  Binds a name to an object, overwriting any existing binding.
  `void`
  `rebind(Name name, Object obj)`
  Binds a name to an object, overwriting any existing binding.
  `Object`
  `removeFromEnvironment(String propName)`
  Removes an environment property from the environment of this context.
  `void`
  `rename(String oldName, String newName)`
  Binds a new name to the object bound to an old name, and unbinds the old name.
  `void`
  `rename(Name oldName, Name newName)`
  Binds a new name to the object bound to an old name, and unbinds the old name.
  `void`
  `unbind(String name)`
  Unbinds the named object.
  `void`
  `unbind(Name name)`
  Unbinds the named object.

- ## Field Details

  - ### ADD_ATTRIBUTE

    static final int ADD_ATTRIBUTE
    This constant specifies to add an attribute with the specified values.

    If attribute does not exist, create the attribute. The resulting attribute has a union of the specified value set and the prior value set. Adding an attribute with no value will throw `InvalidAttributeValueException` if the attribute must have at least one value. For a single-valued attribute where that attribute already exists, throws `AttributeInUseException`. If attempting to add more than one value to a single-valued attribute, throws `InvalidAttributeValueException`.

    The value of this constant is `1`.

    See Also:
      - `ModificationItem`
      - `modifyAttributes(Name, int, Attributes)`
      - Constant Field Values

  - ### REPLACE_ATTRIBUTE

    static final int REPLACE_ATTRIBUTE
    This constant specifies to replace an attribute with specified values.

    If attribute already exists, replaces all existing values with new specified values. If the attribute does not exist, creates it. If no value is specified, deletes all the values of the attribute. Removal of the last value will remove the attribute if the attribute is required to have at least one value. If attempting to add more than one value to a single-valued attribute, throws `InvalidAttributeValueException`.

    The value of this constant is `2`.

    See Also:
      - `ModificationItem`
      - `modifyAttributes(Name, int, Attributes)`
      - Constant Field Values

  - ### REMOVE_ATTRIBUTE

    static final int REMOVE_ATTRIBUTE
    This constant specifies to delete the specified attribute values from the attribute.

    The resulting attribute has the set difference of its prior value set and the specified value set. If no values are specified, deletes the entire attribute. If the attribute does not exist, or if some or all members of the specified value set do not exist, this absence may be ignored and the operation succeeds, or a NamingException may be thrown to indicate the absence. Removal of the last value will remove the attribute if the attribute is required to have at least one value.

    The value of this constant is `3`.

    See Also:
      - `ModificationItem`
      - `modifyAttributes(Name, int, Attributes)`
      - Constant Field Values

- ## Method Details

  - ### getAttributes

    Attributes getAttributes(Name name) throws NamingException
    Retrieves all of the attributes associated with a named object. See the class description regarding attribute models, attribute type names, and operational attributes.
    Parameters:
      `name` - the name of the object from which to retrieve attributes
    Returns:
      the set of attributes associated with `name`. Returns an empty attribute set if name has no attributes; never null.
    Throws:
      `NamingException` - if a naming exception is encountered
    See Also:
      - `getAttributes(String)`
      - `getAttributes(Name, String[])`

  - ### getAttributes

    Attributes getAttributes(String name) throws NamingException
    Retrieves all of the attributes associated with a named object. See `getAttributes(Name)` for details.
    Parameters:
      `name` - the name of the object from which to retrieve attributes
    Returns:
      the set of attributes associated with `name`
    Throws:
      `NamingException` - if a naming exception is encountered

  - ### getAttributes

    Attributes getAttributes(Name name, String[] attrIds) throws NamingException
    Retrieves selected attributes associated with a named object. See the class description regarding attribute models, attribute type names, and operational attributes.

    If the object does not have an attribute specified, the directory will ignore the nonexistent attribute and return those requested attributes that the object does have.

    A directory might return more attributes than was requested (see Attribute Type Names in the class description), but is not allowed to return arbitrary, unrelated attributes.

    See also Operational Attributes in the class description.

    Parameters:
      `name` - the name of the object from which to retrieve attributes
      `attrIds` - the identifiers of the attributes to retrieve. null indicates that all attributes should be retrieved; an empty array indicates that none should be retrieved.
    Returns:
      the requested attributes; never null
    Throws:
      `NamingException` - if a naming exception is encountered

  - ### getAttributes

    Attributes getAttributes(String name, String[] attrIds) throws NamingException
    Retrieves selected attributes associated with a named object. See `getAttributes(Name, String[])` for details.
    Parameters:
      `name` - The name of the object from which to retrieve attributes
      `attrIds` - the identifiers of the attributes to retrieve. null indicates that all attributes should be retrieved; an empty array indicates that none should be retrieved.
    Returns:
      the requested attributes; never null
    Throws:
      `NamingException` - if a naming exception is encountered

  - ### modifyAttributes

    void modifyAttributes(Name name, int mod_op, Attributes attrs) throws NamingException
    Modifies the attributes associated with a named object. The order of the modifications is not specified. Where possible, the modifications are performed atomically.
    Parameters:
      `name` - the name of the object whose attributes will be updated
      `mod_op` - the modification operation, one of: `ADD_ATTRIBUTE`, `REPLACE_ATTRIBUTE`, `REMOVE_ATTRIBUTE`.
      `attrs` - the attributes to be used for the modification; may not be null
    Throws:
      `AttributeModificationException` - if the modification cannot be completed successfully
      `NamingException` - if a naming exception is encountered
    See Also:
      - `modifyAttributes(Name, ModificationItem[])`

  - ### modifyAttributes

    void modifyAttributes(String name, int mod_op, Attributes attrs) throws NamingException
    Modifies the attributes associated with a named object. See `modifyAttributes(Name, int, Attributes)` for details.
    Parameters:
      `name` - the name of the object whose attributes will be updated
      `mod_op` - the modification operation, one of: `ADD_ATTRIBUTE`, `REPLACE_ATTRIBUTE`, `REMOVE_ATTRIBUTE`.
      `attrs` - the attributes to be used for the modification; may not be null
    Throws:
      `AttributeModificationException` - if the modification cannot be completed successfully
      `NamingException` - if a naming exception is encountered

  - ### modifyAttributes

    void modifyAttributes(Name name, ModificationItem[] mods) throws NamingException
    Modifies the attributes associated with a named object using an ordered list of modifications. The modifications are performed in the order specified. Each modification specifies a modification operation code and an attribute on which to operate. Where possible, the modifications are performed atomically.
    Parameters:
      `name` - the name of the object whose attributes will be updated
      `mods` - an ordered sequence of modifications to be performed; may not be null
    Throws:
      `AttributeModificationException` - if the modifications cannot be completed successfully
      `NamingException` - if a naming exception is encountered
    See Also:
      - `modifyAttributes(Name, int, Attributes)`
      - `ModificationItem`

  - ### modifyAttributes

    void modifyAttributes(String name, ModificationItem[] mods) throws NamingException
    Modifies the attributes associated with a named object using an ordered list of modifications. See `modifyAttributes(Name, ModificationItem[])` for details.
    Parameters:
      `name` - the name of the object whose attributes will be updated
      `mods` - an ordered sequence of modifications to be performed; may not be null
    Throws:
      `AttributeModificationException` - if the modifications cannot be completed successfully
      `NamingException` - if a naming exception is encountered

  - ### bind

    void bind(Name name, Object obj, Attributes attrs) throws NamingException
    Binds a name to an object, along with associated attributes. If `attrs` is null, the resulting binding will have the attributes associated with `obj` if `obj` is a `DirContext`, and no attributes otherwise. If `attrs` is non-null, the resulting binding will have `attrs` as its attributes; any attributes associated with `obj` are ignored.
    Parameters:
      `name` - the name to bind; may not be empty
      `obj` - the object to bind; possibly null
      `attrs` - the attributes to associate with the binding
    Throws:
      `NameAlreadyBoundException` - if name is already bound
      `InvalidAttributesException` - if some "mandatory" attributes of the binding are not supplied
      `NamingException` - if a naming exception is encountered
    See Also:
      - `Context.bind(Name, Object)`
      - `rebind(Name, Object, Attributes)`

  - ### bind

    void bind(String name, Object obj, Attributes attrs) throws NamingException
    Binds a name to an object, along with associated attributes. See `bind(Name, Object, Attributes)` for details.
    Parameters:
      `name` - the name to bind; may not be empty
      `obj` - the object to bind; possibly null
      `attrs` - the attributes to associate with the binding
    Throws:
      `NameAlreadyBoundException` - if name is already bound
      `InvalidAttributesException` - if some "mandatory" attributes of the binding are not supplied
      `NamingException` - if a naming exception is encountered

  - ### rebind

    void rebind(Name name, Object obj, Attributes attrs) throws NamingException
    Binds a name to an object, along with associated attributes, overwriting any existing binding. If `attrs` is null and `obj` is a `DirContext`, the attributes from `obj` are used. If `attrs` is null and `obj` is not a `DirContext`, any existing attributes associated with the object already bound in the directory remain unchanged. If `attrs` is non-null, any existing attributes associated with the object already bound in the directory are removed and `attrs` is associated with the named object. If `obj` is a `DirContext` and `attrs` is non-null, the attributes of `obj` are ignored.
    Parameters:
      `name` - the name to bind; may not be empty
      `obj` - the object to bind; possibly null
      `attrs` - the attributes to associate with the binding
    Throws:
      `InvalidAttributesException` - if some "mandatory" attributes of the binding are not supplied
      `NamingException` - if a naming exception is encountered
    See Also:
      - `Context.bind(Name, Object)`
      - `bind(Name, Object, Attributes)`

  - ### rebind

    void rebind(String name, Object obj, Attributes attrs) throws NamingException
    Binds a name to an object, along with associated attributes, overwriting any existing binding. See `rebind(Name, Object, Attributes)` for details.
    Parameters:
      `name` - the name to bind; may not be empty
      `obj` - the object to bind; possibly null
      `attrs` - the attributes to associate with the binding
    Throws:
      `InvalidAttributesException` - if some "mandatory" attributes of the binding are not supplied
      `NamingException` - if a naming exception is encountered

  - ### createSubcontext

    DirContext createSubcontext(Name name, Attributes attrs) throws NamingException
    Creates and binds a new context, along with associated attributes. This method creates a new subcontext with the given name, binds it in the target context (that named by all but terminal atomic component of the name), and associates the supplied attributes with the newly created object. All intermediate and target contexts must already exist. If `attrs` is null, this method is equivalent to `Context.createSubcontext()`.
    Parameters:
      `name` - the name of the context to create; may not be empty
      `attrs` - the attributes to associate with the newly created context
    Returns:
      the newly created context
    Throws:
      `NameAlreadyBoundException` - if the name is already bound
      `InvalidAttributesException` - if `attrs` does not contain all the mandatory attributes required for creation
      `NamingException` - if a naming exception is encountered
    See Also:
      - `Context.createSubcontext(Name)`

  - ### createSubcontext

    DirContext createSubcontext(String name, Attributes attrs) throws NamingException
    Creates and binds a new context, along with associated attributes. See `createSubcontext(Name, Attributes)` for details.
    Parameters:
      `name` - the name of the context to create; may not be empty
      `attrs` - the attributes to associate with the newly created context
    Returns:
      the newly created context
    Throws:
      `NameAlreadyBoundException` - if the name is already bound
      `InvalidAttributesException` - if `attrs` does not contain all the mandatory attributes required for creation
      `NamingException` - if a naming exception is encountered

  - ### getSchema

    DirContext getSchema(Name name) throws NamingException
    Retrieves the schema associated with the named object. The schema describes rules regarding the structure of the namespace and the attributes stored within it. The schema specifies what types of objects can be added to the directory and where they can be added; what mandatory and optional attributes an object can have. The range of support for schemas is directory-specific.

    This method returns the root of the schema information tree that is applicable to the named object. Several named objects (or even an entire directory) might share the same schema.

    Issues such as structure and contents of the schema tree, permission to modify to the contents of the schema tree, and the effect of such modifications on the directory are dependent on the underlying directory.

    Parameters:
      `name` - the name of the object whose schema is to be retrieved
    Returns:
      the schema associated with the context; never null
    Throws:
      `OperationNotSupportedException` - if schema not supported
      `NamingException` - if a naming exception is encountered

  - ### getSchema

    DirContext getSchema(String name) throws NamingException
    Retrieves the schema associated with the named object. See `getSchema(Name)` for details.
    Parameters:
      `name` - the name of the object whose schema is to be retrieved
    Returns:
      the schema associated with the context; never null
    Throws:
      `OperationNotSupportedException` - if schema not supported
      `NamingException` - if a naming exception is encountered

  - ### getSchemaClassDefinition

    DirContext getSchemaClassDefinition(Name name) throws NamingException
    Retrieves a context containing the schema objects of the named object's class definitions.

    One category of information found in directory schemas is class definitions. An "object class" definition specifies the object's type and what attributes (mandatory and optional) the object must/can have. Note that the term "object class" being referred to here is in the directory sense rather than in the Java sense. For example, if the named object is a directory object of "Person" class, `getSchemaClassDefinition()` would return a `DirContext` representing the (directory's) object class definition of "Person".

    The information that can be retrieved from an object class definition is directory-dependent.

    Prior to JNDI 1.2, this method returned a single schema object representing the class definition of the named object. Since JNDI 1.2, this method returns a `DirContext` containing all of the named object's class definitions.

    Parameters:
      `name` - the name of the object whose object class definition is to be retrieved
    Returns:
      the `DirContext` containing the named object's class definitions; never null
    Throws:
      `OperationNotSupportedException` - if schema not supported
      `NamingException` - if a naming exception is encountered

  - ### getSchemaClassDefinition

    DirContext getSchemaClassDefinition(String name) throws NamingException
    Retrieves a context containing the schema objects of the named object's class definitions. See `getSchemaClassDefinition(Name)` for details.
    Parameters:
      `name` - the name of the object whose object class definition is to be retrieved
    Returns:
      the `DirContext` containing the named object's class definitions; never null
    Throws:
      `OperationNotSupportedException` - if schema not supported
      `NamingException` - if a naming exception is encountered

  - ### search

    NamingEnumeration<SearchResult> search(Name name, Attributes matchingAttributes, String[] attributesToReturn) throws NamingException
    Searches in a single context for objects that contain a specified set of attributes, and retrieves selected attributes. The search is performed using the default `SearchControls` settings.

    For an object to be selected, each attribute in `matchingAttributes` must match some attribute of the object. If `matchingAttributes` is empty or null, all objects in the target context are returned.

    An attribute A1 in `matchingAttributes` is considered to match an attribute A2 of an object if A1 and A2 have the same identifier, and each value of A1 is equal to some value of A2. This implies that the order of values is not significant, and that A2 may contain "extra" values not found in A1 without affecting the comparison. It also implies that if A1 has no values, then testing for a match is equivalent to testing for the presence of an attribute A2 with the same identifier.

    The precise definition of "equality" used in comparing attribute values is defined by the underlying directory service. It might use the `Object.equals` method, for example, or might use a schema to specify a different equality operation. For matching based on operations other than equality (such as substring comparison) use the version of the `search` method that takes a filter argument.

    When changes are made to this `DirContext`, the effect on enumerations returned by prior calls to this method is undefined.

    If the object does not have the attribute specified, the directory will ignore the nonexistent attribute and return the requested attributes that the object does have.

    A directory might return more attributes than was requested (see Attribute Type Names in the class description), but is not allowed to return arbitrary, unrelated attributes.

    See also Operational Attributes in the class description.

    Parameters:
      `name` - the name of the context to search
      `matchingAttributes` - the attributes to search for. If empty or null, all objects in the target context are returned.
      `attributesToReturn` - the attributes to return. null indicates that all attributes are to be returned; an empty array indicates that none are to be returned.
    Returns:
      a non-null enumeration of `SearchResult` objects. Each `SearchResult` contains the attributes identified by `attributesToReturn` and the name of the corresponding object, named relative to the context named by `name`.
    Throws:
      `NamingException` - if a naming exception is encountered
    See Also:
      - `SearchControls`
      - `SearchResult`
      - `search(Name, String, Object[], SearchControls)`

  - ### search

    NamingEnumeration<SearchResult> search(String name, Attributes matchingAttributes, String[] attributesToReturn) throws NamingException
    Searches in a single context for objects that contain a specified set of attributes, and retrieves selected attributes. See `search(Name, Attributes, String[])` for details.
    Parameters:
      `name` - the name of the context to search
      `matchingAttributes` - the attributes to search for
      `attributesToReturn` - the attributes to return
    Returns:
      a non-null enumeration of `SearchResult` objects
    Throws:
      `NamingException` - if a naming exception is encountered

  - ### search

    NamingEnumeration<SearchResult> search(Name name, Attributes matchingAttributes) throws NamingException
    Searches in a single context for objects that contain a specified set of attributes. This method returns all the attributes of such objects. It is equivalent to supplying null as the `attributesToReturn` parameter to the method `search(Name, Attributes, String[])`.
    See `search(Name, Attributes, String[])` for a full description.
    Parameters:
      `name` - the name of the context to search
      `matchingAttributes` - the attributes to search for
    Returns:
      an enumeration of `SearchResult` objects
    Throws:
      `NamingException` - if a naming exception is encountered
    See Also:
      - `search(Name, Attributes, String[])`

  - ### search

    NamingEnumeration<SearchResult> search(String name, Attributes matchingAttributes) throws NamingException
    Searches in a single context for objects that contain a specified set of attributes. See `search(Name, Attributes)` for details.
    Parameters:
      `name` - the name of the context to search
      `matchingAttributes` - the attributes to search for
    Returns:
      an enumeration of `SearchResult` objects
    Throws:
      `NamingException` - if a naming exception is encountered

  - ### search

    NamingEnumeration<SearchResult> search(Name name, String filter, SearchControls cons) throws NamingException
    Searches in the named context or object for entries that satisfy the given search filter. Performs the search as specified by the search controls.

    The format and interpretation of `filter` follows RFC 2254 with the following interpretations for `attr` and `value` mentioned in the RFC.

    `attr` is the attribute's identifier.

    `value` is the string representation the attribute's value. The translation of this string representation into the attribute's value is directory-specific.

    For the assertion "someCount=127", for example, `attr` is "someCount" and `value` is "127". The provider determines, based on the attribute ID ("someCount") (and possibly its schema), that the attribute's value is an integer. It then parses the string "127" appropriately.

    Any non-ASCII characters in the filter string should be represented by the appropriate Java (Unicode) characters, and not encoded as UTF-8 octets. Alternately, the "backslash-hexcode" notation described in RFC 2254 may be used.

    If the directory does not support a string representation of some or all of its attributes, the form of `search` that accepts filter arguments in the form of Objects can be used instead. The service provider for such a directory would then translate the filter arguments to its service-specific representation for filter evaluation. See `search(Name, String, Object[], SearchControls)`.

    RFC 2254 defines certain operators for the filter, including substring matches, equality, approximate match, greater than, less than. These operators are mapped to operators with corresponding semantics in the underlying directory. For example, for the equals operator, suppose the directory has a matching rule defining "equality" of the attributes in the filter. This rule would be used for checking equality of the attributes specified in the filter with the attributes of objects in the directory. Similarly, if the directory has a matching rule for ordering, this rule would be used for making "greater than" and "less than" comparisons.

    Not all of the operators defined in RFC 2254 are applicable to all attributes. When an operator is not applicable, the exception `InvalidSearchFilterException` is thrown.

    The result is returned in an enumeration of `SearchResult`s. Each `SearchResult` contains the name of the object and other information about the object (see SearchResult). The name is either relative to the target context of the search (which is named by the `name` parameter), or it is a URL string. If the target context is included in the enumeration (as is possible when `cons` specifies a search scope of `SearchControls.OBJECT_SCOPE` or `SearchControls.SUBSTREE_SCOPE`), its name is the empty string. The `SearchResult` may also contain attributes of the matching object if the `cons` argument specified that attributes be returned.

    If the object does not have a requested attribute, that nonexistent attribute will be ignored. Those requested attributes that the object does have will be returned.

    A directory might return more attributes than were requested (see Attribute Type Names in the class description) but is not allowed to return arbitrary, unrelated attributes.

    See also Operational Attributes in the class description.

    Parameters:
      `name` - the name of the context or object to search
      `filter` - the filter expression to use for the search; may not be null
      `cons` - the search controls that control the search. If null, the default search controls are used (equivalent to `(new SearchControls())`).
    Returns:
      an enumeration of `SearchResult`s of the objects that satisfy the filter; never null
    Throws:
      `InvalidSearchFilterException` - if the search filter specified is not supported or understood by the underlying directory
      `InvalidSearchControlsException` - if the search controls contain invalid settings
      `NamingException` - if a naming exception is encountered
    See Also:
      - `search(Name, String, Object[], SearchControls)`
      - `SearchControls`
      - `SearchResult`

  - ### search

    NamingEnumeration<SearchResult> search(String name, String filter, SearchControls cons) throws NamingException
    Searches in the named context or object for entries that satisfy the given search filter. Performs the search as specified by the search controls. See `search(Name, String, SearchControls)` for details.
    Parameters:
      `name` - the name of the context or object to search
      `filter` - the filter expression to use for the search; may not be null
      `cons` - the search controls that control the search. If null, the default search controls are used (equivalent to `(new SearchControls())`).
    Returns:
      an enumeration of `SearchResult`s for the objects that satisfy the filter.
    Throws:
      `InvalidSearchFilterException` - if the search filter specified is not supported or understood by the underlying directory
      `InvalidSearchControlsException` - if the search controls contain invalid settings
      `NamingException` - if a naming exception is encountered

  - ### search

    NamingEnumeration<SearchResult> search(Name name, String filterExpr, Object[] filterArgs, SearchControls cons) throws NamingException
    Searches in the named context or object for entries that satisfy the given search filter. Performs the search as specified by the search controls.

    The interpretation of `filterExpr` is based on RFC 2254. It may additionally contain variables of the form `{i}` -- where `i` is an integer -- that refer to objects in the `filterArgs` array. The interpretation of `filterExpr` is otherwise identical to that of the `filter` parameter of the method `search(Name, String, SearchControls)`.

    When a variable `{i}` appears in a search filter, it indicates that the filter argument `filterArgs[i]` is to be used in that place. Such variables may be used wherever an attr, value, or matchingrule production appears in the filter grammar of RFC 2254, section 4. When a string-valued filter argument is substituted for a variable, the filter is interpreted as if the string were given in place of the variable, with any characters having special significance within filters (such as `'*'`) having been escaped according to the rules of RFC 2254.

    For directories that do not use a string representation for some or all of their attributes, the filter argument corresponding to an attribute value may be of a type other than String. Directories that support unstructured binary-valued attributes, for example, should accept byte arrays as filter arguments. The interpretation (if any) of filter arguments of any other type is determined by the service provider for that directory, which maps the filter operations onto operations with corresponding semantics in the underlying directory.

    This method returns an enumeration of the results. Each element in the enumeration contains the name of the object and other information about the object (see `SearchResult`). The name is either relative to the target context of the search (which is named by the `name` parameter), or it is a URL string. If the target context is included in the enumeration (as is possible when `cons` specifies a search scope of `SearchControls.OBJECT_SCOPE` or `SearchControls.SUBSTREE_SCOPE`), its name is the empty string.

    The `SearchResult` may also contain attributes of the matching object if the `cons` argument specifies that attributes be returned.

    If the object does not have a requested attribute, that nonexistent attribute will be ignored. Those requested attributes that the object does have will be returned.

    A directory might return more attributes than were requested (see Attribute Type Names in the class description) but is not allowed to return arbitrary, unrelated attributes.

    If a search filter with invalid variable substitutions is provided to this method, the result is undefined. When changes are made to this DirContext, the effect on enumerations returned by prior calls to this method is undefined.

    See also Operational Attributes in the class description.

    Parameters:
      `name` - the name of the context or object to search
      `filterExpr` - the filter expression to use for the search. The expression may contain variables of the form "`{i}`" where `i` is a nonnegative integer. May not be null.
      `filterArgs` - the array of arguments to substitute for the variables in `filterExpr`. The value of `filterArgs[i]` will replace each occurrence of "`{i}`". If null, equivalent to an empty array.
      `cons` - the search controls that control the search. If null, the default search controls are used (equivalent to `(new SearchControls())`).
    Returns:
      an enumeration of `SearchResult`s of the objects that satisfy the filter; never null
    Throws:
      `ArrayIndexOutOfBoundsException` - if `filterExpr` contains `{i}` expressions where `i` is outside the bounds of the array `filterArgs`
      `InvalidSearchControlsException` - if `cons` contains invalid settings
      `InvalidSearchFilterException` - if `filterExpr` with `filterArgs` represents an invalid search filter
      `NamingException` - if a naming exception is encountered
    See Also:
      - `search(Name, Attributes, String[])`
      - `MessageFormat`

  - ### search

    NamingEnumeration<SearchResult> search(String name, String filterExpr, Object[] filterArgs, SearchControls cons) throws NamingException
    Searches in the named context or object for entries that satisfy the given search filter. Performs the search as specified by the search controls. See `search(Name, String, Object[], SearchControls)` for details.
    Parameters:
      `name` - the name of the context or object to search
      `filterExpr` - the filter expression to use for the search. The expression may contain variables of the form "`{i}`" where `i` is a nonnegative integer. May not be null.
      `filterArgs` - the array of arguments to substitute for the variables in `filterExpr`. The value of `filterArgs[i]` will replace each occurrence of "`{i}`". If null, equivalent to an empty array.
      `cons` - the search controls that control the search. If null, the default search controls are used (equivalent to `(new SearchControls())`).
    Returns:
      an enumeration of `SearchResult`s of the objects that satisfy the filter; never null
    Throws:
      `ArrayIndexOutOfBoundsException` - if `filterExpr` contains `{i}` expressions where `i` is outside the bounds of the array `filterArgs`
      `InvalidSearchControlsException` - if `cons` contains invalid settings
      `InvalidSearchFilterException` - if `filterExpr` with `filterArgs` represents an invalid search filter
      `NamingException` - if a naming exception is encountered