Quelle ApplicationRequest.java Sprache: JAVA

/*
* 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.Arrays;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;

import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletRequestWrapper;

/**
* Wrapper around a <code>jakarta.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>jakarta.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 {

    /**
     * The set of attribute names that are special for request dispatchers.
     *
     * @deprecated Will be removed without replacement in Tomcat 11 onwards.
     */
    @Deprecated
    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 };
    /*
     * This duplicates specials but has been added to improve the performance of isSpecial().
     */
    private static final Set<String> specialsSet = new HashSet<>(Arrays.asList(specials));

    /**
     * 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<>();

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

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

    /**
     * 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 <code>getAttributeNames()</code> method of the wrapped request.
     */
    @Override
    public Enumeration<String> getAttributeNames() {
        synchronized (attributes) {
            return Collections.enumeration(attributes.keySet());
        }
    }

    /**
     * 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 <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.
     *
     * @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?
     *
     * @param name Attribute name to be tested
     *
     * @deprecated Will be removed without replacement in Tomcat 11 onwards.
     */
    @Deprecated
    protected boolean isSpecial(String name) {
        return specialsSet.contains(name);
    }
}

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