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Java example source code file (Context.java)

This example Java source code file (Context.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

context, dns_url, language, name, nameparser, namingenumeration, namingexception, object, security_credentials, security_principal, security_protocol, state_factories, string, url_pkg_prefixes, util

The Context.java Java example source code

/*
 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.naming;

import java.util.Hashtable;

/**
 * This interface represents a naming context, which
 * consists of a set of name-to-object bindings.
 * It contains methods for examining and updating these bindings.
 *
 * <h1>Names
 * Each name passed as an argument to a <tt>Context method is relative
 * to that context.  The empty name is used to name the context itself.
 * A name parameter may never be null.
 * <p>
 * Most of the methods have overloaded versions with one taking a
 * <code>Name parameter and one taking a String.
 * These overloaded versions are equivalent in that if
 * the <code>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 fully documented.
 * The second version instead has a link to the first:  the same
 * documentation applies to both.
 * <p>
 * For systems that support federation, <tt>String name arguments to
 * <tt>Context methods are composite names. Name arguments that are
 * instances of <tt>CompositeName are treated as composite names,
 * while <tt>Name arguments that are not instances of
 * <tt>CompositeName are treated as compound names (which might be
 * instances of <tt>CompoundName or other implementations of compound
 * names). This allows the results of <tt>NameParser.parse() to be used as
 * arguments to the <tt>Context methods.
 * Prior to JNDI 1.2, all name arguments were treated as composite names.
 *<p>
 * Furthermore, for systems that support federation, all names returned
 * in a <tt>NamingEnumeration
 * from <tt>list() and listBindings() are composite names
 * represented as strings.
 * See <tt>CompositeName for the string syntax of names.
 *<p>
 * For systems that do not support federation, the name arguments (in
 * either <tt>Name or String forms) and the names returned in
 * <tt>NamingEnumeration may be names in their own namespace rather than
 * names in a composite namespace, at the discretion of the service
 * provider.
 *
 *<h1>Exceptions
 * All the methods in this interface can throw a <tt>NamingException or
 * any of its subclasses. See <tt>NamingException and their subclasses
 * for details on each exception.
 *
 *<h1>Concurrent Access
 * A Context instance is not guaranteed to be synchronized against
 * concurrent access by multiple threads.  Threads that need to access
 * a single Context instance concurrently should synchronize amongst
 * themselves and provide the necessary locking.  Multiple threads
 * each manipulating a different Context instance need not
 * synchronize.  Note that the {@link #lookup(Name) <tt>lookup}
 * method, when passed an empty name, will return a new Context instance
 * representing the same naming context.
 *<p>
 * For purposes of concurrency control,
 * a Context operation that returns a <tt>NamingEnumeration is
 * not considered to have completed while the enumeration is still in
 * use, or while any referrals generated by that operation are still
 * being followed.
 *
 *
 *<h1>Parameters
 * A <tt>Name parameter passed to any method of the
 * <tt>Context interface or one of its subinterfaces
 * 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.
 * A <tt>Name returned by any such method is owned by the caller.
 * The caller may subsequently modify it; the service provider may not.
 *
 *
 *<h1>Environment Properties
 *<p>
 * JNDI applications need a way to communicate various preferences
 * and properties that define the environment in which naming and
 * directory services are accessed. For example, a context might
 * require specification of security credentials in order to access
 * the service. Another context might require that server configuration
 * information be supplied. These are referred to as the <em>environment
 * of a context. The <tt>Context interface provides methods for
 * retrieving and updating this environment.
 *<p>
 * The environment is inherited from the parent context as
 * context methods proceed from one context to the next. Changes to
 * the environment of one context do not directly affect those
 * of other contexts.
 *<p>
 * It is implementation-dependent when environment properties are used
 * and/or verified for validity.  For example, some of the
 * security-related properties are used by service providers to "log in"
 * to the directory.  This login process might occur at the time the
 * context is created, or the first time a method is invoked on the
 * context.  When, and whether this occurs at all, is
 * implementation-dependent.  When environment properties are added or
 * removed from the context, verifying the validity of the changes is again
 * implementation-dependent. For example, verification of some properties
 * might occur at the time the change is made, or at the time the next
 * operation is performed on the context, or not at all.
 *<p>
 * Any object with a reference to a context may examine that context's
 * environment.  Sensitive information such as clear-text
 * passwords should not be stored there unless the implementation is
 * known to protect it.
 *
 *<p>
 *<a name=RESOURCEFILES>
 *<h1>Resource Files
 *<p>
 * To simplify the task of setting up the environment
 * required by a JNDI application,
 * application components and service providers may be distributed
 * along with <em>resource files.
 * A JNDI resource file is a file in the properties file format (see
 * {@link java.util.Properties#load <tt>java.util.Properties}),
 * containing a list of key/value pairs.
 * The key is the name of the property (e.g. "java.naming.factory.object")
 * and the value is a string in the format defined
 * for that property.  Here is an example of a JNDI resource file:
 *
 * <blockquote>{@code
 * java.naming.factory.object=com.sun.jndi.ldap.AttrsToCorba:com.wiz.from.Person
 * java.naming.factory.state=com.sun.jndi.ldap.CorbaToAttrs:com.wiz.from.Person
 * java.naming.factory.control=com.sun.jndi.ldap.ResponseControlFactory
 * }</blockquote>
 *
 * The JNDI class library reads the resource files and makes the property
 * values freely available.  Thus JNDI resource files should be considered
 * to be "world readable", and sensitive information such as clear-text
 * passwords should not be stored there.
 *<p>
 * There are two kinds of JNDI resource files:
 * <em>provider and application.
 *
 * <h2>Provider Resource Files
 *
 * Each service provider has an optional resource that lists properties
 * specific to that provider.  The name of this resource is:
 * <blockquote>
 * [<em>prefix/]jndiprovider.properties
 * </blockquote>
 * where <em>prefix is
 * the package name of the provider's context implementation(s),
 * with each period (".") converted to a slash ("/").
 *
 * For example, suppose a service provider defines a context
 * implementation with class name <tt>com.sun.jndi.ldap.LdapCtx.
 * The provider resource for this provider is named
 * <tt>com/sun/jndi/ldap/jndiprovider.properties.  If the class is
 * not in a package, the resource's name is simply
 * <tt>jndiprovider.properties.
 *
 * <p>
 * <a name=LISTPROPS>
 * Certain methods in the JNDI class library make use of the standard
 * JNDI properties that specify lists of JNDI factories:
 * <ul>
 * <li>java.naming.factory.object
 * <li>java.naming.factory.state
 * <li>java.naming.factory.control
 * <li>java.naming.factory.url.pkgs
 * </ul>
 * The JNDI library will consult the provider resource file
 * when determining the values of these properties.
 * Properties other than these may be set in the provider
 * resource file at the discretion of the service provider.
 * The service provider's documentation should clearly state which
 * properties are allowed; other properties in the file will be ignored.
 *
 * <h2>Application Resource Files
 *
 * When an application is deployed, it will generally have several
 * codebase directories and JARs in its classpath.  Similarly, when an
 * applet is deployed, it will have a codebase and archives specifying
 * where to find the applet's classes.  JNDI locates (using
 * {@link ClassLoader#getResources <tt>ClassLoader.getResources()})
 * all <em>application resource files named jndi.properties
 * in the classpath.
 * In addition, if the file <i>java.home/lib/jndi.properties
 * exists and is readable,
 * JNDI treats it as an additional application resource file.
 * (<i>java.home indicates the
 * directory named by the <tt>java.home system property.)
 * All of the properties contained in these files are placed
 * into the environment of the initial context.  This environment
 * is then inherited by other contexts.
 *
 * <p>
 * For each property found in more than one application resource file,
 * JNDI uses the first value found or, in a few cases where it makes
 * sense to do so, it concatenates all of the values (details are given
 * below).
 * For example, if the "java.naming.factory.object" property is found in
 * three <tt>jndi.properties resource files, the
 * list of object factories is a concatenation of the property
 * values from all three files.
 * Using this scheme, each deployable component is responsible for
 * listing the factories that it exports.  JNDI automatically
 * collects and uses all of these export lists when searching for factory
 * classes.
 *
 * <h2>Search Algorithm for Properties
 *
 * When JNDI constructs an initial context, the context's environment
 * is initialized with properties defined in the environment parameter
 * passed to the constructor, the system properties, the applet parameters,
 * and the application resource files.  See
 * <a href=InitialContext.html#ENVIRONMENT>InitialContext
 * for details.
 * This initial environment is then inherited by other context instances.
 *
 * <p>
 * When the JNDI class library needs to determine
 * the value of a property, it does so by merging
 * the values from the following two sources, in order:
 * <ol>
 * <li>The environment of the context being operated on.
 * <li>The provider resource file (jndiprovider.properties)
 * for the context being operated on.
 * </ol>
 * For each property found in both of these two sources,
 * JNDI determines the property's value as follows.  If the property is
 * one of the standard JNDI properties that specify a list of JNDI
 * factories (listed <a href=#LISTPROPS>above), the values are
 * concatenated into a single colon-separated list.  For other
 * properties, only the first value found is used.
 *
 * <p>
 * When a service provider needs to determine the value of a property,
 * it will generally take that value directly from the environment.
 * A service provider may define provider-specific properties
 * to be placed in its own provider resource file.  In that
 * case it should merge values as described in the previous paragraph.
 *
 * <p>
 * In this way, each service provider developer can specify a list of
 * factories to use with that service provider. These can be modified by
 * the application resources specified by the deployer of the application
 * or applet, which in turn can be modified by the user.
 *
 * @author Rosanna Lee
 * @author Scott Seligman
 * @author R. Vasudevan
 *
 * @since 1.3
 */

public interface Context {

    /**
     * Retrieves the named object.
     * If <tt>name is empty, returns a new instance of this context
     * (which represents the same naming context as this context, but its
     * environment may be modified independently and it may be accessed
     * concurrently).
     *
     * @param name
     *          the name of the object to look up
     * @return  the object bound to <tt>name
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #lookup(String)
     * @see #lookupLink(Name)
     */
    public Object lookup(Name name) throws NamingException;

    /**
     * Retrieves the named object.
     * See {@link #lookup(Name)} for details.
     * @param name
     *          the name of the object to look up
     * @return  the object bound to <tt>name
     * @throws  NamingException if a naming exception is encountered
     */
    public Object lookup(String name) throws NamingException;

    /**
     * Binds a name to an object.
     * All intermediate contexts and the target context (that named by all
     * but terminal atomic component of the name) must already exist.
     *
     * @param name
     *          the name to bind; may not be empty
     * @param obj
     *          the object to bind; possibly null
     * @throws  NameAlreadyBoundException if name is already bound
     * @throws  javax.naming.directory.InvalidAttributesException
     *          if object did not supply all mandatory attributes
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #bind(String, Object)
     * @see #rebind(Name, Object)
     * @see javax.naming.directory.DirContext#bind(Name, Object,
     *          javax.naming.directory.Attributes)
     */
    public void bind(Name name, Object obj) throws NamingException;

    /**
     * Binds a name to an object.
     * See {@link #bind(Name, Object)} for details.
     *
     * @param name
     *          the name to bind; may not be empty
     * @param obj
     *          the object to bind; possibly null
     * @throws  NameAlreadyBoundException if name is already bound
     * @throws  javax.naming.directory.InvalidAttributesException
     *          if object did not supply all mandatory attributes
     * @throws  NamingException if a naming exception is encountered
     */
    public void bind(String name, Object obj) throws NamingException;

    /**
     * Binds a name to an object, overwriting any existing binding.
     * All intermediate contexts and the target context (that named by all
     * but terminal atomic component of the name) must already exist.
     *
     * <p> If the object is a DirContext, any existing attributes
     * associated with the name are replaced with those of the object.
     * Otherwise, any existing attributes associated with the name remain
     * unchanged.
     *
     * @param name
     *          the name to bind; may not be empty
     * @param obj
     *          the object to bind; possibly null
     * @throws  javax.naming.directory.InvalidAttributesException
     *          if object did not supply all mandatory attributes
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #rebind(String, Object)
     * @see #bind(Name, Object)
     * @see javax.naming.directory.DirContext#rebind(Name, Object,
     *          javax.naming.directory.Attributes)
     * @see javax.naming.directory.DirContext
     */
    public void rebind(Name name, Object obj) throws NamingException;

    /**
     * Binds a name to an object, overwriting any existing binding.
     * See {@link #rebind(Name, Object)} for details.
     *
     * @param name
     *          the name to bind; may not be empty
     * @param obj
     *          the object to bind; possibly null
     * @throws  javax.naming.directory.InvalidAttributesException
     *          if object did not supply all mandatory attributes
     * @throws  NamingException if a naming exception is encountered
     */
    public void rebind(String name, Object obj) throws NamingException;

    /**
     * Unbinds the named object.
     * Removes the terminal atomic name in <code>name
     * from the target context--that named by all but the terminal
     * atomic part of <code>name.
     *
     * <p> This method is idempotent.
     * It succeeds even if the terminal atomic name
     * is not bound in the target context, but throws
     * <tt>NameNotFoundException
     * if any of the intermediate contexts do not exist.
     *
     * <p> Any attributes associated with the name are removed.
     * Intermediate contexts are not changed.
     *
     * @param name
     *          the name to unbind; may not be empty
     * @throws  NameNotFoundException if an intermediate context does not exist
     * @throws  NamingException if a naming exception is encountered
     * @see #unbind(String)
     */
    public void unbind(Name name) throws NamingException;

    /**
     * Unbinds the named object.
     * See {@link #unbind(Name)} for details.
     *
     * @param name
     *          the name to unbind; may not be empty
     * @throws  NameNotFoundException if an intermediate context does not exist
     * @throws  NamingException if a naming exception is encountered
     */
    public void unbind(String name) throws NamingException;

    /**
     * Binds a new name to the object bound to an old name, and unbinds
     * the old name.  Both names are relative to this context.
     * Any attributes associated with the old name become associated
     * with the new name.
     * Intermediate contexts of the old name are not changed.
     *
     * @param oldName
     *          the name of the existing binding; may not be empty
     * @param newName
     *          the name of the new binding; may not be empty
     * @throws  NameAlreadyBoundException if <tt>newName is already bound
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #rename(String, String)
     * @see #bind(Name, Object)
     * @see #rebind(Name, Object)
     */
    public void rename(Name oldName, Name newName) throws NamingException;

    /**
     * Binds a new name to the object bound to an old name, and unbinds
     * the old name.
     * See {@link #rename(Name, Name)} for details.
     *
     * @param oldName
     *          the name of the existing binding; may not be empty
     * @param newName
     *          the name of the new binding; may not be empty
     * @throws  NameAlreadyBoundException if <tt>newName is already bound
     * @throws  NamingException if a naming exception is encountered
     */
    public void rename(String oldName, String newName) throws NamingException;

    /**
     * Enumerates the names bound in the named context, along with the
     * class names of objects bound to them.
     * The contents of any subcontexts are not included.
     *
     * <p> If a binding is added to or removed from this context,
     * its effect on an enumeration previously returned is undefined.
     *
     * @param name
     *          the name of the context to list
     * @return  an enumeration of the names and class names of the
     *          bindings in this context.  Each element of the
     *          enumeration is of type <tt>NameClassPair.
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #list(String)
     * @see #listBindings(Name)
     * @see NameClassPair
     */
    public NamingEnumeration<NameClassPair> list(Name name)
        throws NamingException;

    /**
     * Enumerates the names bound in the named context, along with the
     * class names of objects bound to them.
     * See {@link #list(Name)} for details.
     *
     * @param name
     *          the name of the context to list
     * @return  an enumeration of the names and class names of the
     *          bindings in this context.  Each element of the
     *          enumeration is of type <tt>NameClassPair.
     * @throws  NamingException if a naming exception is encountered
     */
    public NamingEnumeration<NameClassPair> list(String name)
        throws NamingException;

    /**
     * Enumerates the names bound in the named context, along with the
     * objects bound to them.
     * The contents of any subcontexts are not included.
     *
     * <p> If a binding is added to or removed from this context,
     * its effect on an enumeration previously returned is undefined.
     *
     * @param name
     *          the name of the context to list
     * @return  an enumeration of the bindings in this context.
     *          Each element of the enumeration is of type
     *          <tt>Binding.
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #listBindings(String)
     * @see #list(Name)
     * @see Binding
      */
    public NamingEnumeration<Binding> listBindings(Name name)
        throws NamingException;

    /**
     * Enumerates the names bound in the named context, along with the
     * objects bound to them.
     * See {@link #listBindings(Name)} for details.
     *
     * @param name
     *          the name of the context to list
     * @return  an enumeration of the bindings in this context.
     *          Each element of the enumeration is of type
     *          <tt>Binding.
     * @throws  NamingException if a naming exception is encountered
     */
    public NamingEnumeration<Binding> listBindings(String name)
        throws NamingException;

    /**
     * Destroys the named context and removes it from the namespace.
     * Any attributes associated with the name are also removed.
     * Intermediate contexts are not destroyed.
     *
     * <p> This method is idempotent.
     * It succeeds even if the terminal atomic name
     * is not bound in the target context, but throws
     * <tt>NameNotFoundException
     * if any of the intermediate contexts do not exist.
     *
     * <p> In a federated naming system, a context from one naming system
     * may be bound to a name in another.  One can subsequently
     * look up and perform operations on the foreign context using a
     * composite name.  However, an attempt destroy the context using
     * this composite name will fail with
     * <tt>NotContextException, because the foreign context is not
     * a "subcontext" of the context in which it is bound.
     * Instead, use <tt>unbind() to remove the
     * binding of the foreign context.  Destroying the foreign context
     * requires that the <tt>destroySubcontext() be performed
     * on a context from the foreign context's "native" naming system.
     *
     * @param name
     *          the name of the context to be destroyed; may not be empty
     * @throws  NameNotFoundException if an intermediate context does not exist
     * @throws  NotContextException if the name is bound but does not name a
     *          context, or does not name a context of the appropriate type
     * @throws  ContextNotEmptyException if the named context is not empty
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #destroySubcontext(String)
     */
    public void destroySubcontext(Name name) throws NamingException;

    /**
     * Destroys the named context and removes it from the namespace.
     * See {@link #destroySubcontext(Name)} for details.
     *
     * @param name
     *          the name of the context to be destroyed; may not be empty
     * @throws  NameNotFoundException if an intermediate context does not exist
     * @throws  NotContextException if the name is bound but does not name a
     *          context, or does not name a context of the appropriate type
     * @throws  ContextNotEmptyException if the named context is not empty
     * @throws  NamingException if a naming exception is encountered
     */
    public void destroySubcontext(String name) throws NamingException;

    /**
     * Creates and binds a new context.
     * Creates a new context with the given name and binds it in
     * the target context (that named by all but terminal atomic
     * component of the name).  All intermediate contexts and the
     * target context must already exist.
     *
     * @param name
     *          the name of the context to create; may not be empty
     * @return  the newly created context
     *
     * @throws  NameAlreadyBoundException if name is already bound
     * @throws  javax.naming.directory.InvalidAttributesException
     *          if creation of the subcontext requires specification of
     *          mandatory attributes
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #createSubcontext(String)
     * @see javax.naming.directory.DirContext#createSubcontext
     */
    public Context createSubcontext(Name name) throws NamingException;

    /**
     * Creates and binds a new context.
     * See {@link #createSubcontext(Name)} for details.
     *
     * @param name
     *          the name of the context to create; may not be empty
     * @return  the newly created context
     *
     * @throws  NameAlreadyBoundException if name is already bound
     * @throws  javax.naming.directory.InvalidAttributesException
     *          if creation of the subcontext requires specification of
     *          mandatory attributes
     * @throws  NamingException if a naming exception is encountered
     */
    public Context createSubcontext(String name) throws NamingException;

    /**
     * Retrieves the named object, following links except
     * for the terminal atomic component of the name.
     * If the object bound to <tt>name is not a link,
     * returns the object itself.
     *
     * @param name
     *          the name of the object to look up
     * @return  the object bound to <tt>name, not following the
     *          terminal link (if any).
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #lookupLink(String)
     */
    public Object lookupLink(Name name) throws NamingException;

    /**
     * Retrieves the named object, following links except
     * for the terminal atomic component of the name.
     * See {@link #lookupLink(Name)} for details.
     *
     * @param name
     *          the name of the object to look up
     * @return  the object bound to <tt>name, not following the
     *          terminal link (if any)
     * @throws  NamingException if a naming exception is encountered
     */
    public Object lookupLink(String name) throws NamingException;

    /**
     * Retrieves the parser associated with the named context.
     * In a federation of namespaces, different naming systems will
     * parse names differently.  This method allows an application
     * to get a parser for parsing names into their atomic components
     * using the naming convention of a particular naming system.
     * Within any single naming system, <tt>NameParser objects
     * returned by this method must be equal (using the <tt>equals()
     * test).
     *
     * @param name
     *          the name of the context from which to get the parser
     * @return  a name parser that can parse compound names into their atomic
     *          components
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #getNameParser(String)
     * @see CompoundName
     */
    public NameParser getNameParser(Name name) throws NamingException;

    /**
     * Retrieves the parser associated with the named context.
     * See {@link #getNameParser(Name)} for details.
     *
     * @param name
     *          the name of the context from which to get the parser
     * @return  a name parser that can parse compound names into their atomic
     *          components
     * @throws  NamingException if a naming exception is encountered
     */
    public NameParser getNameParser(String name) throws NamingException;

    /**
     * Composes the name of this context with a name relative to
     * this context.
     * Given a name (<code>name) relative to this context, and
     * the name (<code>prefix) of this context relative to one
     * of its ancestors, this method returns the composition of the
     * two names using the syntax appropriate for the naming
     * system(s) involved.  That is, if <code>name names an
     * object relative to this context, the result is the name of the
     * same object, but relative to the ancestor context.  None of the
     * names may be null.
     * <p>
     * For example, if this context is named "wiz.com" relative
     * to the initial context, then
     * <pre>
     *  composeName("east", "wiz.com")  </pre>
     * might return <code>"east.wiz.com".
     * If instead this context is named "org/research", then
     * <pre>
     *  composeName("user/jane", "org/research")        </pre>
     * might return <code>"org/research/user/jane" while
     * <pre>
     *  composeName("user/jane", "research")    </pre>
     * returns <code>"research/user/jane".
     *
     * @param name
     *          a name relative to this context
     * @param prefix
     *          the name of this context relative to one of its ancestors
     * @return  the composition of <code>prefix and name
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #composeName(String, String)
     */
    public Name composeName(Name name, Name prefix)
        throws NamingException;

    /**
     * Composes the name of this context with a name relative to
     * this context.
     * See {@link #composeName(Name, Name)} for details.
     *
     * @param name
     *          a name relative to this context
     * @param prefix
     *          the name of this context relative to one of its ancestors
     * @return  the composition of <code>prefix and name
     * @throws  NamingException if a naming exception is encountered
     */
    public String composeName(String name, String prefix)
            throws NamingException;

    /**
     * Adds a new environment property to the environment of this
     * context.  If the property already exists, its value is overwritten.
     * See class description for more details on environment properties.
     *
     * @param propName
     *          the name of the environment property to add; may not be null
     * @param propVal
     *          the value of the property to add; may not be null
     * @return  the previous value of the property, or null if the property was
     *          not in the environment before
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #getEnvironment()
     * @see #removeFromEnvironment(String)
     */
    public Object addToEnvironment(String propName, Object propVal)
        throws NamingException;

    /**
     * Removes an environment property from the environment of this
     * context.  See class description for more details on environment
     * properties.
     *
     * @param propName
     *          the name of the environment property to remove; may not be null
     * @return  the previous value of the property, or null if the property was
     *          not in the environment
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #getEnvironment()
     * @see #addToEnvironment(String, Object)
     */
    public Object removeFromEnvironment(String propName)
        throws NamingException;

    /**
     * Retrieves the environment in effect for this context.
     * See class description for more details on environment properties.
     *
     * <p> The caller should not make any changes to the object returned:
     * their effect on the context is undefined.
     * The environment of this context may be changed using
     * <tt>addToEnvironment() and removeFromEnvironment().
     *
     * @return  the environment of this context; never null
     * @throws  NamingException if a naming exception is encountered
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     */
    public Hashtable<?,?> getEnvironment() throws NamingException;

    /**
     * Closes this context.
     * This method releases this context's resources immediately, instead of
     * waiting for them to be released automatically by the garbage collector.
     *
     * <p> This method is idempotent:  invoking it on a context that has
     * already been closed has no effect.  Invoking any other method
     * on a closed context is not allowed, and results in undefined behaviour.
     *
     * @throws  NamingException if a naming exception is encountered
     */
    public void close() throws NamingException;

    /**
     * Retrieves the full name of this context within its own namespace.
     *
     * <p> Many naming services have a notion of a "full name" for objects
     * in their respective namespaces.  For example, an LDAP entry has
     * a distinguished name, and a DNS record has a fully qualified name.
     * This method allows the client application to retrieve this name.
     * The string returned by this method is not a JNDI composite name
     * and should not be passed directly to context methods.
     * In naming systems for which the notion of full name does not
     * make sense, <tt>OperationNotSupportedException is thrown.
     *
     * @return  this context's name in its own namespace; never null
     * @throws  OperationNotSupportedException if the naming system does
     *          not have the notion of a full name
     * @throws  NamingException if a naming exception is encountered
     *
     * @since 1.3
     */
    public String getNameInNamespace() throws NamingException;

// public static final:  JLS says recommended style is to omit these modifiers
// because they are the default

    /**
     * Constant that holds the name of the environment property
     * for specifying the initial context factory to use. The value
     * of the property should be the fully qualified class name
     * of the factory class that will create an initial context.
     * This property may be specified in the environment parameter
     * passed to the initial context constructor, an applet parameter,
     * a system property, or an application resource file.
     * If it is not specified in any of these sources,
     * <tt>NoInitialContextException is thrown when an initial
     * context is required to complete an operation.
     *
     * <p> The value of this constant is "java.naming.factory.initial".
     *
     * @see InitialContext
     * @see javax.naming.directory.InitialDirContext
     * @see javax.naming.spi.NamingManager#getInitialContext
     * @see javax.naming.spi.InitialContextFactory
     * @see NoInitialContextException
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     * @see #APPLET
     */
    String INITIAL_CONTEXT_FACTORY = "java.naming.factory.initial";

    /**
     * Constant that holds the name of the environment property
     * for specifying the list of object factories to use. The value
     * of the property should be a colon-separated list of the fully
     * qualified class names of factory classes that will create an object
     * given information about the object.
     * This property may be specified in the environment, an applet
     * parameter, a system property, or one or more resource files.
     *
     * <p> The value of this constant is "java.naming.factory.object".
     *
     * @see javax.naming.spi.NamingManager#getObjectInstance
     * @see javax.naming.spi.ObjectFactory
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     * @see #APPLET
     */
    String OBJECT_FACTORIES = "java.naming.factory.object";

    /**
     * Constant that holds the name of the environment property
     * for specifying the list of state factories to use. The value
     * of the property should be a colon-separated list of the fully
     * qualified class names of state factory classes that will be used
     * to get an object's state given the object itself.
     * This property may be specified in the environment, an applet
     * parameter, a system property, or one or more resource files.
     *
     * <p> The value of this constant is "java.naming.factory.state".
     *
     * @see javax.naming.spi.NamingManager#getStateToBind
     * @see javax.naming.spi.StateFactory
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     * @see #APPLET
     * @since 1.3
     */
    String STATE_FACTORIES = "java.naming.factory.state";

    /**
     * Constant that holds the name of the environment property
     * for specifying the list of package prefixes to use when
     * loading in URL context factories. The value
     * of the property should be a colon-separated list of package
     * prefixes for the class name of the factory class that will create
     * a URL context factory.
     * This property may be specified in the environment,
     * an applet parameter, a system property, or one or more
     * resource files.
     * The prefix <tt>com.sun.jndi.url is always appended to
     * the possibly empty list of package prefixes.
     *
     * <p> The value of this constant is "java.naming.factory.url.pkgs".
     *
     * @see javax.naming.spi.NamingManager#getObjectInstance
     * @see javax.naming.spi.NamingManager#getURLContext
     * @see javax.naming.spi.ObjectFactory
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     * @see #APPLET
      */
    String URL_PKG_PREFIXES = "java.naming.factory.url.pkgs";

    /**
     * Constant that holds the name of the environment property
     * for specifying configuration information for the service provider
     * to use. The value of the property should contain a URL string
     * (e.g. "ldap://somehost:389").
     * This property may be specified in the environment,
     * an applet parameter, a system property, or a resource file.
     * If it is not specified in any of these sources,
     * the default configuration is determined by the service provider.
     *
     * <p> The value of this constant is "java.naming.provider.url".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     * @see #APPLET
     */
    String PROVIDER_URL = "java.naming.provider.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").
     * This property may be specified in the environment,
     * an applet parameter, a system property, or a resource file.
     * If it is not specified in any of these sources
     * and the program attempts to use a JNDI URL containing a DNS name,
     * a <tt>ConfigurationException will be thrown.
     *
     * <p> The value of this constant is "java.naming.dns.url".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     */
    String DNS_URL = "java.naming.dns.url";

    /**
     * Constant that holds the name of the environment property for
     * specifying the authoritativeness of the service requested.
     * If the value of the property is the string "true", it means
     * that the access is to the most authoritative source (i.e. bypass
     * any cache or replicas). If the value is anything else,
     * the source need not be (but may be) authoritative.
     * If unspecified, the value defaults to "false".
     *
     * <p> The value of this constant is "java.naming.authoritative".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     */
    String AUTHORITATIVE = "java.naming.authoritative";

    /**
     * Constant that holds the name of the environment property for
     * specifying the batch size to use when returning data via the
     * service's protocol. This is a hint to the provider to return
     * the results of operations in batches of the specified size, so
     * the provider can optimize its performance and usage of resources.
     * The value of the property is the string representation of an
     * integer.
     * If unspecified, the batch size is determined by the service
     * provider.
     *
     * <p> The value of this constant is "java.naming.batchsize".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     */
    String BATCHSIZE = "java.naming.batchsize";

    /**
     * Constant that holds the name of the environment property for
     * specifying how referrals encountered by the service provider
     * are to be processed. The value of the property is one of the
     * following strings:
     * <dl>
     * <dt>"follow"
     * <dd>follow referrals automatically
     * <dt>"ignore"
     * <dd>ignore referrals
     * <dt>"throw"
     * <dd>throw ReferralException when a referral is encountered.
     * </dl>
     * If this property is not specified, the default is
     * determined by the provider.
     *
     * <p> The value of this constant is "java.naming.referral".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     */
    String REFERRAL = "java.naming.referral";

    /**
     * Constant that holds the name of the environment property for
     * specifying the security protocol to use.
     * Its value is a string determined by the service provider
     * (e.g. "ssl").
     * If this property is unspecified,
     * the behaviour is determined by the service provider.
     *
     * <p> The value of this constant is "java.naming.security.protocol".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     */
    String SECURITY_PROTOCOL = "java.naming.security.protocol";

    /**
     * Constant that holds the name of the environment property for
     * specifying the security level to use.
     * Its value is one of the following strings:
     * "none", "simple", "strong".
     * If this property is unspecified,
     * the behaviour is determined by the service provider.
     *
     * <p> The value of this constant is "java.naming.security.authentication".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     */
    String SECURITY_AUTHENTICATION = "java.naming.security.authentication";

    /**
     * Constant that holds the name of the environment property for
     * specifying the identity of the principal for authenticating
     * the caller to the service. The format of the principal
     * depends on the authentication scheme.
     * If this property is unspecified,
     * the behaviour is determined by the service provider.
     *
     * <p> The value of this constant is "java.naming.security.principal".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     */
    String SECURITY_PRINCIPAL = "java.naming.security.principal";

    /**
     * Constant that holds the name of the environment property for
     * specifying the credentials of the principal for authenticating
     * the caller to the service. The value of the property depends
     * on the authentication scheme. For example, it could be a hashed
     * password, clear-text password, key, certificate, and so on.
     * If this property is unspecified,
     * the behaviour is determined by the service provider.
     *
     * <p> The value of this constant is "java.naming.security.credentials".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     */

    String SECURITY_CREDENTIALS = "java.naming.security.credentials";
    /**
     * Constant that holds the name of the environment property for
     * specifying the preferred language to use with the service.
     * The value of the property is a colon-separated list of language
     * tags as defined in RFC 1766.
     * If this property is unspecified,
     * the language preference is determined by the service provider.
     *
     * <p> The value of this constant is "java.naming.language".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     */
    String LANGUAGE = "java.naming.language";

    /**
     * Constant that holds the name of the environment property for
     * specifying an applet for the initial context constructor to use
     * when searching for other properties.
     * The value of this property is the
     * <tt>java.applet.Applet instance that is being executed.
     * This property may be specified in the environment parameter
     * passed to the initial context constructor.
     * When this property is set, each property that the initial context
     * constructor looks for in the system properties is first looked for
     * in the applet's parameter list.
     * If this property is unspecified, the initial context constructor
     * will search for properties only in the environment parameter
     * passed to it, the system properties, and application resource files.
     *
     * <p> The value of this constant is "java.naming.applet".
     *
     * @see #addToEnvironment(String, Object)
     * @see #removeFromEnvironment(String)
     * @see InitialContext
     *
     * @since 1.3
     */
    String APPLET = "java.naming.applet";
};

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