applicationcontext.java

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/*
 * $Header: /home/cvs/jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/core/ApplicationContext.java,v 1.22 2004/01/26 23:13:51 luehe Exp $
 * $Revision: 1.22 $
 * $Date: 2004/01/26 23:13:51 $
 *
 * ====================================================================
 *
 * 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.catalina.core;


import java.io.File;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;

import javax.naming.Binding;
import javax.naming.NamingException;
import javax.naming.directory.DirContext;
import javax.servlet.RequestDispatcher;
import javax.servlet.Servlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextAttributeEvent;
import javax.servlet.ServletContextAttributeListener;

import org.apache.catalina.Context;
import org.apache.catalina.Host;
import org.apache.catalina.Logger;
import org.apache.catalina.Wrapper;
import org.apache.catalina.deploy.ApplicationParameter;
import org.apache.catalina.util.Enumerator;
import org.apache.catalina.util.ResourceSet;
import org.apache.catalina.util.ServerInfo;
import org.apache.catalina.util.StringManager;
import org.apache.naming.resources.DirContextURLStreamHandler;
import org.apache.naming.resources.Resource;
import org.apache.tomcat.util.buf.CharChunk;
import org.apache.tomcat.util.buf.MessageBytes;
import org.apache.tomcat.util.http.mapper.MappingData;


/**
 * Standard implementation of <code>ServletContext</code> that represents
 * a web application's execution environment.  An instance of this class is
 * associated with each instance of <code>StandardContext</code>.
 *
 * @author Craig R. McClanahan
 * @author Remy Maucherat
 * @version $Revision: 1.22 $ $Date: 2004/01/26 23:13:51 $
 */

public class ApplicationContext
    implements ServletContext {

    // ----------------------------------------------------------- Constructors


    /**
     * Construct a new instance of this class, associated with the specified
     * Context instance.
     *
     * @param context The associated Context instance
     */
    public ApplicationContext(String basePath, StandardContext context) {
        super();
        this.context = context;
        this.basePath = basePath;
    }


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


    /**
     * The context attributes for this context.
     */
    private HashMap attributes = new HashMap();


    /**
     * List of read only attributes for this context.
     */
    private HashMap readOnlyAttributes = new HashMap();


    /**
     * The Context instance with which we are associated.
     */
    private StandardContext context = null;


    /**
     * Empty collection to serve as the basis for empty enumerations.
     * <strong>DO NOT ADD ANY ELEMENTS TO THIS COLLECTION!</strong>
     */
    private static final ArrayList empty = new ArrayList();


    /**
     * The facade around this object.
     */
    private ServletContext facade = new ApplicationContextFacade(this);


    /**
     * The merged context initialization parameters for this Context.
     */
    private HashMap parameters = null;


    /**
     * The string manager for this package.
     */
    private static final StringManager sm =
      StringManager.getManager(Constants.Package);


    /**
     * Base path.
     */
    private String basePath = null;


    /**
     * Thread local mapping data.
     */
    private ThreadLocal localMappingData = new ThreadLocal();


    /**
     * Thread local URI message bytes.
     */
    private ThreadLocal localUriMB = new ThreadLocal();


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


    /**
     * Return the resources object that is mapped to a specified path.
     * The path must begin with a "/" and is interpreted as relative to the
     * current context root.
     */
    public DirContext getResources() {

        return context.getResources();

    }


    // ------------------------------------------------- ServletContext Methods


    /**
     * Return the value of the specified context attribute, if any;
     * otherwise return <code>null</code>.
     *
     * @param name Name of the context attribute to return
     */
    public Object getAttribute(String name) {

        synchronized (attributes) {
            return (attributes.get(name));
        }

    }


    /**
     * Return an enumeration of the names of the context attributes
     * associated with this context.
     */
    public Enumeration getAttributeNames() {

        synchronized (attributes) {
            return new Enumerator(attributes.keySet(), true);
        }

    }


    /**
     * Return a <code>ServletContext</code> object that corresponds to a
     * specified URI on the server.  This method allows servlets to gain
     * access to the context for various parts of the server, and as needed
     * obtain <code>RequestDispatcher</code> objects or resources from the
     * context.  The given path must be absolute (beginning with a "/"),
     * and is interpreted based on our virtual host's document root.
     *
     * @param uri Absolute URI of a resource on the server
     */
    public ServletContext getContext(String uri) {

        // Validate the format of the specified argument
        if ((uri == null) || (!uri.startsWith("/")))
            return (null);

        // Return the current context if requested
        String contextPath = context.getPath();
        if (!contextPath.endsWith("/"))
            contextPath = contextPath + "/";
        if ((contextPath.length() > 1) && 
            ((uri.equals(context.getPath())) 
             || (uri.startsWith(contextPath)))) {
            return (this);
        }

        // Return other contexts only if allowed
        if (!context.getCrossContext())
            return (null);
        try {
            Host host = (Host) context.getParent();
            Context child = null;
            String mapuri = uri;
            while (true) {
                child = (Context) host.findChild(mapuri);
                if (context != null)
                    break;
                int slash = mapuri.lastIndexOf('/');
                if (slash < 0)
                    break;
                mapuri = mapuri.substring(0, slash);
            }
            if (child == null) {
                child = (Context) host.findChild("");
            }
            if (child != null)
                return (child.getServletContext());
            else
                return (null);
        } catch (Throwable t) {
            return (null);
        }

    }


    /**
     * Return the value of the specified initialization parameter, or
     * <code>null</code> if this parameter does not exist.
     *
     * @param name Name of the initialization parameter to retrieve
     */
    public String getInitParameter(final String name) {

        mergeParameters();
        synchronized (parameters) {
            return ((String) parameters.get(name));
        }
    }


    /**
     * Return the names of the context's initialization parameters, or an
     * empty enumeration if the context has no initialization parameters.
     */
    public Enumeration getInitParameterNames() {

        mergeParameters();
        synchronized (parameters) {
           return (new Enumerator(parameters.keySet()));
        }

    }


    /**
     * Return the major version of the Java Servlet API that we implement.
     */
    public int getMajorVersion() {

        return (Constants.MAJOR_VERSION);

    }


    /**
     * Return the minor version of the Java Servlet API that we implement.
     */
    public int getMinorVersion() {

        return (Constants.MINOR_VERSION);

    }