/*
 * 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.Collections;
import java.util.Enumeration;
import java.util.HashMap;

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


Wrapper around a 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
javax.servlet.ServletRequestWrapper class)
back into an internal org.apache.catalina.Request.

WARNING:  Due to Java's lack of support for multiple
inheritance, all of the logic in ApplicationRequest is
duplicated in ApplicationHttpRequest.  Make sure that you
keep these two classes in synchronization when making changes!
Author:
Craig R. McClanahan/**
 * Wrapper around a <code>javax.servlet.ServletRequest</code>
 * 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</code> class)
 * back into an internal <code>org.apache.catalina.Request</code>.
 * <p>
 * <strong>WARNING</strong>:  Due to Java's lack of support for multiple
 * inheritance, all of the logic in <code>ApplicationRequest</code> is
 * duplicated in <code>ApplicationHttpRequest</code>.  Make sure that you
 * keep these two classes in synchronization when making changes!
 *
 * @author Craig R. McClanahan
 */
class ApplicationRequest extends ServletRequestWrapper {


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


    
The set of attribute names that are special for request dispatchers.
/**
     * The set of attribute names that are special for request dispatchers.
     */
    protected static final String specials[] =
    { RequestDispatcher.INCLUDE_REQUEST_URI,
      RequestDispatcher.INCLUDE_CONTEXT_PATH,
      RequestDispatcher.INCLUDE_SERVLET_PATH,
      RequestDispatcher.INCLUDE_PATH_INFO,
      RequestDispatcher.INCLUDE_QUERY_STRING,
      RequestDispatcher.INCLUDE_MAPPING,
      RequestDispatcher.FORWARD_REQUEST_URI,
      RequestDispatcher.FORWARD_CONTEXT_PATH,
      RequestDispatcher.FORWARD_SERVLET_PATH,
      RequestDispatcher.FORWARD_PATH_INFO,
      RequestDispatcher.FORWARD_QUERY_STRING,
      RequestDispatcher.FORWARD_MAPPING};


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


    
Construct a new wrapped request around the specified servlet request.
Params:
request – The servlet request being wrapped/**
     * 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.
/**
     * The request attributes for this request.  This is initialized from the
     * wrapped request, but updates are allowed.
     */
    protected final HashMap<String, Object> attributes = new HashMap<>();


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


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

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

    }


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

        synchronized (attributes) {
            return Collections.enumeration(attributes.keySet());
        }

    }


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

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

    }


    
Override the setAttribute() method of the
wrapped request.
Params:
name – Name of the attribute to set
value – Value of the attribute to set/**
     * Override the <code>setAttribute()</code> method of the
     * wrapped request.
     *
     * @param name Name of the attribute to set
     * @param value Value of the attribute to set
     */
    @Override
    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.
Params:
request – The new wrapped request/**
     * Set the request that we are wrapping.
     *
     * @param request The new wrapped request
     */
    @Override
    public void setRequest(ServletRequest request) {

        super.setRequest(request);

        // Initialize the attributes for this request
        synchronized (attributes) {
            attributes.clear();
            Enumeration<String> names = request.getAttributeNames();
            while (names.hasMoreElements()) {
                String name = 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?
Params:
name – Attribute name to be tested/**
     * 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;

    }


}