applicationhttprequest.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.catalina.core;


import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;

import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpSession;

import org.apache.catalina.Context;
import org.apache.catalina.Globals;
import org.apache.catalina.Session;
import org.apache.catalina.Manager;
import org.apache.catalina.util.Enumerator;
import org.apache.catalina.util.RequestUtil;
import org.apache.catalina.util.StringManager;


/**
 * Wrapper around a <code>javax.servlet.http.HttpServletRequest</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.http.HttpServletRequestWrapper</code> class)
 * back into an internal <code>org.apache.catalina.HttpRequest</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
 * @author Remy Maucherat
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 */

class ApplicationHttpRequest extends HttpServletRequestWrapper {


    // ------------------------------------------------------- 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 };


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


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


    /**
     * Construct a new wrapped request around the specified servlet request.
     *
     * @param request The servlet request being wrapped
     */
    public ApplicationHttpRequest(HttpServletRequest request, Context context,
                                  boolean crossContext) {

        super(request);
        this.context = context;
        this.crossContext = crossContext;
        setRequest(request);

    }


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


    /**
     * The context for this request.
     */
    protected Context context = null;


    /**
     * The context path for this request.
     */
    protected String contextPath = null;


    /**
     * If this request is cross context, since this changes session accesss
     * behavior.
     */
    protected boolean crossContext = false;


    /**
     * The current dispatcher type.
     */
    protected Object dispatcherType = null;


    /**
     * Descriptive information about this implementation.
     */
    protected static final String info =
        "org.apache.catalina.core.ApplicationHttpRequest/1.0";


    /**
     * The request parameters for this request.  This is initialized from the
     * wrapped request, but updates are allowed.
     */
    protected Map parameters = null;


    /**
     * Have the parameters for this request already been parsed?
     */
    private boolean parsedParams = false;


    /**
     * The path information for this request.
     */
    protected String pathInfo = null;


    /**
     * The query parameters for the current request.
     */
    private String queryParamString = null;


    /**
     * The query string for this request.
     */
    protected String queryString = null;


    /**
     * The current request dispatcher path.
     */
    protected Object requestDispatcherPath = null;


    /**
     * The request URI for this request.
     */
    protected String requestURI = null;


    /**
     * The servlet path for this request.
     */
    protected String servletPath = null;


    /**
     * The currently active session for this request.
     */
    protected Session session = null;


    /**
     * Special attributes.
     */
    protected Object[] specialAttributes = new Object[specials.length];


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


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

        if (name.equals(Globals.DISPATCHER_TYPE_ATTR)) {
            return dispatcherType;
        } else if (name.equals(Globals.DISPATCHER_REQUEST_PATH_ATTR)) {
            if ( requestDispatcherPath != null ){
                return requestDispatcherPath.toString();
            } else {
                return null;   
            }
        }

        int pos = getSpecial(name);
        if (pos == -1) {
            return getRequest().getAttribute(name);
        } else {
            if ((specialAttributes[pos] == null) 
                && (specialAttributes[5] == null) && (pos >= 5)) {
                // If it's a forward special attribute, and null, it means this
                // is an include, so we check the wrapped request since 
                // the request could have been forwarded before the include
                return getRequest().getAttribute(name);
            } else {
                return specialAttributes[pos];
            }
        }

    }


    /**
     * Override the <code>getAttributeNames()</code> method of the wrapped
     * request.
     */
    public Enumeration getAttributeNames() {
        return (new AttributeNamesEnumerator());
    }


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

        if (!removeSpecial(name))
            getRequest().removeAttribute(name);

    }


    /**
     * 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
     */
    public void setAttribute(String name, Object value) {

        if (name.equals(Globals.DISPATCHER_TYPE_ATTR)) {
            dispatcherType = value;
            return;
        } else if (name.equals(Globals.DISPATCHER_REQUEST_PATH_ATTR)) {
            requestDispatcherPath = value;
            return;
        }

        if (!setSpecial(name, value)) {
            getRequest().setAttribute(name, value);
        }

    }


    /**
     * Return a RequestDispatcher that wraps the resource at the specified
     * path, which may be interpreted as relative to the current request path.
     *
     * @param path Path of the resource to be wrapped
     */
    public RequestDispatcher getRequestDispatcher(String path) {

        if (context == null)
            return (null);

        // If the path is already context-relative, just pass it through
        if (path == null)
            return (null);
        else if (path.startsWith("/"))
            return (context.getServletContext().getRequestDispatcher(path));

        // Convert a request-relative path to a context-relative one
        String servletPath = 
            (String) getAttribute(Globals.INCLUDE_SERVLET_PATH_ATTR);
        if (servletPath == null)
            servletPath = getServletPath();

        // Add the path info, if there is any
        String pathInfo = getPathInfo();
        String requestPath = null;

        if (pathInfo == null) {
            requestPath = servletPath;
        } else {
            requestPath = servletPath + pathInfo;
        }

        int pos = requestPath.lastIndexOf('/');
        String relative = null;
        if (pos >= 0) {
            relative = RequestUtil.normalize
                (requestPath.substring(0, pos + 1) + path);
        } else {
            relative = RequestUtil.normalize(requestPath + path);
        }

        return (context.getServletContext().getRequestDispatcher(relative));

    }


    // --------------------------------------------- HttpServletRequest Methods


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

        return (this.contextPath);

    }


    /**
     * Override the <code>getParameter()</code> method of the wrapped request.
     *
     * @param name Name of the requested parameter
     */
    public String getParameter(String name) {

	parseParameters();

        Object value = parameters.get(name);
        if (value == null)
            return (null);
        else if (value instanceof String[])
            return (((String[]) value)[0]);
        else if (value instanceof String)
            return ((String) value);
        else
            return (value.toString());

    }


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

	parseParameters();
        return (parameters);

    }


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

	parseParameters();
        return (new Enumerator(parameters.keySet()));

    }


    /**
     * Override the <code>getParameterValues()</code> method of the
     * wrapped request.
     *
     * @param name Name of the requested parameter
     */
    public String[] getParameterValues(String name) {

	parseParameters();
        Object value = parameters.get(name);
        if (value == null)
            return ((String[]) null);
        else if (value instanceof String[])
            return ((String[]) value);
        else if (value instanceof String) {
            String values[] = new String[1];
            values[0] = (String) value;
            return (values);
        } else {
            String values[] = new String[1];
            values[0] = value.toString();
            return (values);
        }

    }


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

        return (this.pathInfo);

    }


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

        return (this.queryString);

    }


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

        return (this.requestURI);

    }


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

        StringBuffer url = new StringBuffer();
        String scheme = getScheme();
        int port = getServerPort();
        if (port < 0)
            port = 80; // Work around java.net.URL bug

        url.append(scheme);
        url.append("://");
        url.append(getServerName());
        if ((scheme.equals("http") && (port != 80))
            || (scheme.equals("https") && (port != 443))) {
            url.append(':');
            url.append(port);
        }
        url.append(getRequestURI());

        return (url);

    }