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Struts example source code file (PortletSessionMap.java)

This example Struts source code file (PortletSessionMap.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 - Struts tags/keywords

abstractmap, abstractmap, enumeration, hashset, log, logger, object, object, portletsession, portletsessionmap, portletsessionmap, set, set, string, util

The Struts PortletSessionMap.java source code

/*
 * $Id: PortletSessionMap.java 651946 2008-04-27 13:41:38Z 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.struts2.portlet;

import java.util.AbstractMap;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import javax.portlet.PortletRequest;
import javax.portlet.PortletSession;

import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;

/**
 * A simple implementation of the {@link java.util.Map} interface to handle a collection of portlet session
 * attributes. The {@link #entrySet()} method enumerates over all session attributes and creates a Set of entries.
 * Note, this will occur lazily - only when the entry set is asked for.
 *
 */
public class PortletSessionMap extends AbstractMap {

    private static final Logger LOG = LoggerFactory.getLogger(PortletSessionMap.class);

    private PortletSession session = null;
    private Set<Object> entries = null;

    /**
     * Creates a new session map given a portlet request.
     *
     * @param request the portlet request object.
     */
    public PortletSessionMap(PortletRequest request) {
        this.session = request.getPortletSession();
    }

    /**
     * @see java.util.Map#entrySet()
     */
    public Set entrySet() {
        synchronized (session) {
            if (entries == null) {
                entries = new HashSet<Object>();

                Enumeration enumeration = session.getAttributeNames();

                while (enumeration.hasMoreElements()) {
                    final String key = enumeration.nextElement().toString();
                    final Object value = session.getAttribute(key);
                    entries.add(new Map.Entry() {
                        public boolean equals(Object obj) {
                            Map.Entry entry = (Map.Entry) obj;

                            return ((key == null) ? (entry.getKey() == null)
                                    : key.equals(entry.getKey()))
                                    && ((value == null) ? (entry.getValue() == null)
                                            : value.equals(entry.getValue()));
                        }

                        public int hashCode() {
                            return ((key == null) ? 0 : key.hashCode())
                                    ^ ((value == null) ? 0 : value.hashCode());
                        }

                        public Object getKey() {
                            return key;
                        }

                        public Object getValue() {
                            return value;
                        }

                        public Object setValue(Object obj) {
                            session.setAttribute(key, obj);

                            return value;
                        }
                    });
                }
            }
        }

        return entries;
    }

    /**
     * Returns the session attribute associated with the given key or
     * <tt>null if it doesn't exist.
     *
     * @param key the name of the session attribute.
     * @return the session attribute or <tt>null if it doesn't exist.
     */
    public Object get(Object key) {
        synchronized (session) {
            return session.getAttribute(key.toString());
        }
    }

    /**
     * Saves an attribute in the session.
     *
     * @param key the name of the session attribute.
     * @param value the value to set.
     * @return the object that was just set.
     */
    public Object put(Object key, Object value) {
        synchronized (session) {
            entries = null;
            session.setAttribute(key.toString(), value);

            return get(key);
        }
    }

    /**
     * @see java.util.Map#clear()
     */
    public void clear() {
        synchronized (session) {
            entries = null;
            session.invalidate();
        }
    }

    /**
     * Removes the specified session attribute.
     *
     * @param key the name of the attribute to remove.
     * @return the value that was removed or <tt>null if the value was
     * not found (and hence, not removed).
     */
    public Object remove(Object key) {
        synchronized (session) {
            entries = null;

            Object value = get(key);
            session.removeAttribute(key.toString());

            return value;
        }
    }
}

Other Struts examples (source code examples)

Here is a short list of links related to this Struts PortletSessionMap.java source code file:

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