org.apache.portals.pluto.demo.chat.ChatHistory.java Source code

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Here is the source code for org.apache.portals.pluto.demo.chat.ChatHistory.java

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/*  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.portals.pluto.demo.chat;

import org.apache.commons.lang3.StringEscapeUtils;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;

/**
 * Manages the chat history by maintaining a list of messages entered. This is an
 * application scoped bean, so all portlet instances see the same view.
 * 
 * @author Scott Nicklous
 */
@ApplicationScoped
public class ChatHistory {

    private List<String> messages = Collections.synchronizedList(new ArrayList<String>());

    // Injects the name bean in order to prepend the name to the message

    @Inject
    private NameBean nameBean;

    /**
     * Adds a new chat message
     */
    public void addMessage(String message) {
        String name = nameBean.getName();
        if (name == null || name.length() == 0) {
            name = "World";
        }
        messages.add(name + ": " + message);
    }

    /**
     * returns the number of messages. Used in order to poll for changes.
     */
    public int getNumberOfMessages() {
        return messages.size();
    }

    /**
     * returns the markup for the stored messages
     */
    public String getMarkup() {
        StringBuilder txt = new StringBuilder(128);
        synchronized (messages) {
            for (String msg : messages) {
                txt.append("<p>").append(StringEscapeUtils.escapeHtml4(msg)).append("</p>\n");
            }
        }
        return txt.toString();
    }

    /**
     * clears all stored messages
     */
    public void clear() {
        messages.clear();
    }
}