wardircontext.java

业界著名的tomcat服务器的最新6.0的源代码。

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 


package org.apache.naming.resources;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;

import javax.naming.CompositeName;
import javax.naming.Name;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.OperationNotSupportedException;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.ModificationItem;
import javax.naming.directory.SearchControls;

import org.apache.naming.NamingContextBindingsEnumeration;
import org.apache.naming.NamingContextEnumeration;
import org.apache.naming.NamingEntry;

/**
 * WAR Directory Context implementation.
 *
 * @author Remy Maucherat
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 */

public class WARDirContext extends BaseDirContext {

    private static org.apache.juli.logging.Log log=
        org.apache.juli.logging.LogFactory.getLog( WARDirContext.class );
    
    // ----------------------------------------------------------- Constructors


    /**
     * Builds a WAR directory context using the given environment.
     */
    public WARDirContext() {
        super();
    }


    /**
     * Builds a WAR directory context using the given environment.
     */
    public WARDirContext(Hashtable env) {
        super(env);
    }


    /**
     * Constructor used for returning fake subcontexts.
     */
    protected WARDirContext(ZipFile base, Entry entries) {
        this.base = base;
        this.entries = entries;
    }


    // ----------------------------------------------------- Instance Variables


    /**
     * The WAR file.
     */
    protected ZipFile base = null;


    /**
     * WAR entries.
     */
    protected Entry entries = null;


    // ------------------------------------------------------------- Properties


    /**
     * Set the document root.
     * 
     * @param docBase The new document root
     * 
     * @exception IllegalArgumentException if the specified value is not
     *  supported by this implementation
     * @exception IllegalArgumentException if this would create a
     *  malformed URL
     */
    public void setDocBase(String docBase) {

	// Validate the format of the proposed document root
	if (docBase == null)
	    throw new IllegalArgumentException
		(sm.getString("resources.null"));
	if (!(docBase.endsWith(".war")))
	    throw new IllegalArgumentException
		(sm.getString("warResources.notWar"));

	// Calculate a File object referencing this document base directory
	File base = new File(docBase);

	// Validate that the document base is an existing directory
	if (!base.exists() || !base.canRead() || base.isDirectory())
	    throw new IllegalArgumentException
		(sm.getString("warResources.invalidWar", docBase));
        try {
            this.base = new ZipFile(base);
        } catch (Exception e) {
	    throw new IllegalArgumentException
		(sm.getString("warResources.invalidWar", e.getMessage()));
        }
        super.setDocBase(docBase);

        loadEntries();

    }


    // --------------------------------------------------------- Public Methods


    /**
     * Release any resources allocated for this directory context.
     */
    public void release() {

        entries = null;
        if (base != null) {
            try {
                base.close();
            } catch (IOException e) {
                log.warn
                    ("Exception closing WAR File " + base.getName(), e);
            }
        }
        base = null;
        super.release();

    }


    // -------------------------------------------------------- Context Methods


    /**
     * 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(new CompositeName(name));
    }


    /**
     * 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 {
        if (name.isEmpty())
            return this;
        Entry entry = treeLookup(name);
        if (entry == null)
            throw new NamingException
                (sm.getString("resources.notFound", name));
        ZipEntry zipEntry = entry.getEntry();
        if (zipEntry.isDirectory())
            return new WARDirContext(base, entry);
        else
            return new WARResource(entry.getEntry());
    }


    /**
     * 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(String name)
        throws NamingException {
        throw new OperationNotSupportedException();
    }


    /**
     * 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 {
        throw new OperationNotSupportedException();
    }


    /**
     * 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(new CompositeName(name));
    }


    /**
     * 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(Name name)
        throws NamingException {
        if (name.isEmpty())
            return new NamingContextEnumeration(list(entries).iterator());
        Entry entry = treeLookup(name);
        if (entry == null)
            throw new NamingException
                (sm.getString("resources.notFound", name));
        return new NamingContextEnumeration(list(entry).iterator());
    }


    /**
     * 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(String name)
        throws NamingException {
        return listBindings(new CompositeName(name));
    }


    /**
     * 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.