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Tomcat example source code file (ApplicationRequest.java)

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

Java - Tomcat tags/keywords

applicationrequest, applicationrequest, enumeration, enumeration, hashmap, object, object, servlet, servletrequestwrapper, string, string, stringmanager, util

The Tomcat ApplicationRequest.java source code

/*
 * 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.catalina.core;


import java.util.Enumeration;
import java.util.HashMap;

import javax.servlet.ServletRequest;
import javax.servlet.ServletRequestWrapper;

import org.apache.catalina.Globals;
import org.apache.catalina.util.Enumerator;
import org.apache.catalina.util.StringManager;


/**
 * Wrapper around a <code>javax.servlet.ServletRequest
 * that transforms an application request object (which might be the original
 * one passed to a servlet, or might be based on the 2.3
 * <code>javax.servlet.ServletRequestWrapper class)
 * back into an internal <code>org.apache.catalina.Request.
 * <p>
 * <strong>WARNING:  Due to Java's lack of support for multiple
 * inheritance, all of the logic in <code>ApplicationRequest is
 * duplicated in <code>ApplicationHttpRequest.  Make sure that you
 * keep these two classes in synchronization when making changes!
 *
 * @author Craig R. McClanahan
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 */

class ApplicationRequest extends ServletRequestWrapper {


    // ------------------------------------------------------- Static Variables


    /**
     * The set of attribute names that are special for request dispatchers.
     */
    protected static final String specials[] =
    { Globals.INCLUDE_REQUEST_URI_ATTR, Globals.INCLUDE_CONTEXT_PATH_ATTR,
      Globals.INCLUDE_SERVLET_PATH_ATTR, Globals.INCLUDE_PATH_INFO_ATTR,
      Globals.INCLUDE_QUERY_STRING_ATTR, Globals.FORWARD_REQUEST_URI_ATTR, 
      Globals.FORWARD_CONTEXT_PATH_ATTR, Globals.FORWARD_SERVLET_PATH_ATTR, 
      Globals.FORWARD_PATH_INFO_ATTR, Globals.FORWARD_QUERY_STRING_ATTR };


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


    /**
     * Construct a new wrapped request around the specified servlet request.
     *
     * @param request The servlet request being wrapped
     */
    public ApplicationRequest(ServletRequest request) {

        super(request);
        setRequest(request);

    }


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


    /**
     * The request attributes for this request.  This is initialized from the
     * wrapped request, but updates are allowed.
     */
    protected HashMap attributes = new HashMap();


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


    // ------------------------------------------------- ServletRequest Methods


    /**
     * Override the <code>getAttribute() method of the wrapped request.
     *
     * @param name Name of the attribute to retrieve
     */
    public Object getAttribute(String name) {

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

    }


    /**
     * Override the <code>getAttributeNames() method of the wrapped
     * request.
     */
    public Enumeration getAttributeNames() {

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

    }


    /**
     * Override the <code>removeAttribute() method of the
     * wrapped request.
     *
     * @param name Name of the attribute to remove
     */
    public void removeAttribute(String name) {

        synchronized (attributes) {
            attributes.remove(name);
            if (!isSpecial(name))
                getRequest().removeAttribute(name);
        }

    }


    /**
     * Override the <code>setAttribute() method of the
     * wrapped request.
     *
     * @param name Name of the attribute to set
     * @param value Value of the attribute to set
     */
    public void setAttribute(String name, Object value) {

        synchronized (attributes) {
            attributes.put(name, value);
            if (!isSpecial(name))
                getRequest().setAttribute(name, value);
        }

    }


    // ------------------------------------------ ServletRequestWrapper Methods


    /**
     * Set the request that we are wrapping.
     *
     * @param request The new wrapped request
     */
    public void setRequest(ServletRequest request) {

        super.setRequest(request);

        // Initialize the attributes for this request
        synchronized (attributes) {
            attributes.clear();
            Enumeration names = request.getAttributeNames();
            while (names.hasMoreElements()) {
                String name = (String) names.nextElement();
                Object value = request.getAttribute(name);
                attributes.put(name, value);
            }
        }

    }


    // ------------------------------------------------------ Protected Methods


    /**
     * Is this attribute name one of the special ones that is added only for
     * included servlets?
     *
     * @param name Attribute name to be tested
     */
    protected boolean isSpecial(String name) {

        for (int i = 0; i < specials.length; i++) {
            if (specials[i].equals(name))
                return (true);
        }
        return (false);

    }


}

Other Tomcat examples (source code examples)

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