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Tiles servlet support, to enable use of Tiles inside a Servlet environment.
There is a newer version: 3.0.8
/*
 * $Id: ServletRequestScopeMap.java 581985 2007-10-04 18:57:15Z apetrelli $
 *
 * 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.tiles.servlet.context;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.servlet.ServletRequest;

import org.apache.tiles.context.MapEntry;

/**
 * Private implementation of Map for servlet request
 * attributes.
 *
 * @version $Rev: 581985 $ $Date: 2007-10-04 20:57:15 +0200 (gio, 04 ott 2007) $
 */

final class ServletRequestScopeMap implements Map {


    /**
     * Constructor.
     *
     * @param request The request object to use.
     */
    public ServletRequestScopeMap(ServletRequest request) {
        this.request = request;
    }


    /**
     * The request object to use.
     */
    private ServletRequest request = null;


    /** {@inheritDoc} */
    public void clear() {
        Iterator keys = keySet().iterator();
        while (keys.hasNext()) {
            request.removeAttribute(keys.next());
        }
    }


    /** {@inheritDoc} */
    public boolean containsKey(Object key) {
        return (request.getAttribute(key(key)) != null);
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public boolean containsValue(Object value) {
        if (value == null) {
            return (false);
        }
        Enumeration keys = request.getAttributeNames();
        while (keys.hasMoreElements()) {
            Object next = request.getAttribute(keys.nextElement());
            if (next == value) {
                return (true);
            }
        }
        return (false);
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public Set> entrySet() {
        Set> set = new HashSet>();
        Enumeration keys = request.getAttributeNames();
        String key;
        while (keys.hasMoreElements()) {
            key = keys.nextElement();
            set.add(new MapEntry(key,
                    request.getAttribute(key), true));
        }
        return (set);
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public boolean equals(Object o) {
        ServletRequest otherRequest = ((ServletRequestScopeMap) o).request;
        boolean retValue = true;
        synchronized (request) {
            for (Enumeration attribs = request.getAttributeNames(); attribs
                    .hasMoreElements()
                    && retValue;) {
                String attributeName = attribs.nextElement();
                retValue = request.getAttribute(attributeName).equals(
                        otherRequest.getAttribute(attributeName));
            }
        }

        return retValue;
    }


    /** {@inheritDoc} */
    public Object get(Object key) {
        return (request.getAttribute(key(key)));
    }


    /** {@inheritDoc} */
    public int hashCode() {
        return (request.hashCode());
    }


    /** {@inheritDoc} */
    public boolean isEmpty() {
        return (size() < 1);
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public Set keySet() {
        Set set = new HashSet();
        Enumeration keys = request.getAttributeNames();
        while (keys.hasMoreElements()) {
            set.add(keys.nextElement());
        }
        return (set);
    }


    /** {@inheritDoc} */
    public Object put(String key, Object value) {
        if (value == null) {
            return (remove(key));
        }
        String skey = key(key);
        Object previous = request.getAttribute(skey);
        request.setAttribute(skey, value);
        return (previous);
    }


    /** {@inheritDoc} */
    public void putAll(Map map) {
        Iterator keys = map.keySet().iterator();
        while (keys.hasNext()) {
            String key = keys.next();
            request.setAttribute(key, map.get(key));
        }
    }


    /** {@inheritDoc} */
    public Object remove(Object key) {
        String skey = key(key);
        Object previous = request.getAttribute(skey);
        request.removeAttribute(skey);
        return (previous);
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public int size() {
        int n = 0;
        Enumeration keys = request.getAttributeNames();
        while (keys.hasMoreElements()) {
            keys.nextElement();
            n++;
        }
        return (n);
    }


    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public Collection