basecontext.java

Tomcat 4.1与WebServer集成组件的源代码包.

/*
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
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 * [Additional notices, if required by prior licensing conditions]
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package org.apache.naming.core;

import java.util.*;
import javax.naming.*;
import javax.naming.directory.DirContext;
import javax.naming.directory.Attributes;
import javax.naming.directory.Attribute;
import javax.naming.directory.ModificationItem;
import javax.naming.directory.SearchControls;

import org.apache.tomcat.util.res.StringManager;

// Based on a merge of various catalina naming contexts
// Name is used - it provide better oportunities for reuse and optimizations

/**
 * Base Context implementation. Use it if the source doesn't support attributes.
 *
 * Implements all JNDI methods with reasonable defaults or UnsuportedOperation.
 *
 * IMPORTANT: all contexts should use setters/getters for configuration, instead
 * of the Hashtable. The default constructor will use introspection to configure
 * and may provide ( via a hook ? ) JMX management on all contexts.
 *
 * All methods use Name variant. They should expect an arbitrary implementation, but
 * it's recommended to check if ServerName is used - and take advantage of the
 * specific features ( MessageBytes, etc ).
 *
 * @author Remy Maucherat
 * @author Costin Manolache
 */
public class BaseContext extends BaseNaming implements Context {

    public BaseContext() {
        super();
    }

    public BaseContext(Hashtable env) {
        super(env);
    }


    // -------------------- Context impl --------------------

    /**
     * Retrieves the named object. If 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 name
     * @exception NamingException if a naming exception is encountered
     */
    public Object lookup(Name name)
            throws NamingException {
        return lookup(name, true);
    }

    /**
     * Retrieves the named object.
     *
     * @param name the name of the object to look up
     * @return the object bound to name
     * @exception NamingException if a naming exception is encountered
     */
    public Object lookup(String name)
            throws NamingException {
        return lookup(string2Name(name), true);
    }


    /**
     * 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
     * @exception NameAlreadyBoundException if name is already bound
     * @exception InvalidAttributesException if object did not supply all
     * mandatory attributes
     * @exception NamingException if a naming exception is encountered
     */
    public void bind(Name name, Object obj)
            throws NamingException {
        bind(name, obj, null, false);
    }


    /**
     * Binds a name to an object.
     *
     * @param name the name to bind; may not be empty
     * @param obj the object to bind; possibly null
     * @exception NameAlreadyBoundException if name is already bound
     * @exception InvalidAttributesException if object did not supply all
     * mandatory attributes
     * @exception NamingException if a naming exception is encountered
     */
    public void bind(String name, Object obj)
            throws NamingException {
        bind(string2Name(name), obj, null, false);
    }


    /**
     * 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
     * @exception InvalidAttributesException if object did not supply all
     * mandatory attributes
     * @exception NamingException if a naming exception is encountered
     */
    public void rebind(Name name, Object obj)
            throws NamingException {
        bind(name, obj, null, true);
    }


    /**
     * Binds a name to an object, overwriting any existing binding.
     *
     * @param name the name to bind; may not be empty
     * @param obj the object to bind; possibly null
     * @exception InvalidAttributesException if object did not supply all
     * mandatory attributes
     * @exception NamingException if a naming exception is encountered
     */
    public void rebind(String name, Object obj)
            throws NamingException {
        bind(string2Name(name), obj, null, true);
    }


    /**
     * Unbinds the named object. Removes the terminal atomic name in name
     * from the target context--that named by all but the terminal atomic
     * part of name.
     * <p>
     * This method is idempotent. It succeeds even if the terminal atomic
     * name is not bound in the target context, but throws
     * NameNotFoundException if any of the intermediate contexts do not exist.
     *
     * @param name the name to bind; may not be empty
     * @exception NameNotFoundException if an intermediate context does not
     * exist
     * @exception NamingException if a naming exception is encountered
     */
    public void unbind(Name name)
            throws NamingException {
        unbind(name, false);
    }

    public void unbind(String name)
            throws NamingException {
        unbind(string2Name(name), false);
    }


    /**
     * 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
     * @exception NameAlreadyBoundException if newName is already bound
     * @exception NamingException if a naming exception is encountered
     */
    public void rename(String oldName, String newName)
            throws NamingException {
        rename(string2Name(oldName), string2Name(newName));
    }


    /**
     * 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 NameClassPair.
     * @exception NamingException if a naming exception is encountered
     */
    public NamingEnumeration list(String name)
            throws NamingException {
        return list(string2Name(name));
    }

    public NamingEnumeration list(Name name)
            throws NamingException {
        return new NamingContextEnumeration(super.getChildren(), this, false);
    }


    /**
     * 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 Binding.
     * @exception NamingException if a naming exception is encountered
     */
    public NamingEnumeration listBindings(Name name)
            throws NamingException {
        return new NamingContextEnumeration(super.getChildren(), this, true);
    }

    public NamingEnumeration listBindings(String name)
            throws NamingException {
        return listBindings(string2Name(name));
    }


    /**
     * 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
     * NameNotFoundException if any of the intermediate contexts do not exist.
     *
     * 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
     * NotContextException, because the foreign context is not a "subcontext"
     * of the context in which it is bound. Instead, use unbind() to remove
     * the binding of the foreign context. Destroying the foreign context
     * requires that the 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
     * @exception NameNotFoundException if an intermediate context does not
     * exist
     * @exception NotContextException if the name is bound but does not name
     * a context, or does not name a context of the appropriate type
     */
    public void destroySubcontext(Name name)
            throws NamingException {
        unbind(name, true);
    }


    /**
     * Destroys the named context and removes it from the namespace.
     *
     * @param name the name of the context to be destroyed; may not be empty
     * @exception NameNotFoundException if an intermediate context does not
     * exist
     * @exception NotContextException if the name is bound but does not name
     * a context, or does not name a context of the appropriate type
     */
    public void destroySubcontext(String name)
            throws NamingException {
        unbind(string2Name(name), true);
    }


    /**
     * Creates and binds a new context. Creates a new context with the given