wardircontext.java

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/*
 * $Header: /home/cvs/jakarta-tomcat-catalina/catalina/src/share/org/apache/naming/resources/WARDirContext.java,v 1.3 2004/01/26 19:48:27 remm Exp $
 * $Revision: 1.3 $
 * $Date: 2004/01/26 19:48:27 $
 *
 * ====================================================================
 *
 * 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. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    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.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */ 


package org.apache.naming.resources;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Date;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
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: 1.3 $ $Date: 2004/01/26 19:48:27 $
 */

public class WARDirContext extends BaseDirContext {


    // ----------------------------------------------------------- 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.notWar"));
        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) {
                System.out.println
                    ("Exception closing WAR File " + base.getName());
                e.printStackTrace(System.out);
            }
        }
        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));
        Entry entry = treeLookup(name);
        if (entry == null)
            throw new NamingException
                (sm.getString("resources.notFound", name));
        return new NamingContextEnumeration(list(entry));
    }