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Mockrunner is a lightweight framework for unit testing applications in the J2EE environment. It supports servlets, filters, tag classes and Struts actions. It includes a JDBC a JMS and a JCA test framework and can be used to test EJB based applications.
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package com.mockrunner.jms;

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

import com.mockrunner.mock.jms.MockBytesMessage;
import com.mockrunner.mock.jms.MockMapMessage;
import com.mockrunner.mock.jms.MockMessage;
import com.mockrunner.mock.jms.MockObjectMessage;
import com.mockrunner.mock.jms.MockStreamMessage;
import com.mockrunner.mock.jms.MockTextMessage;

/**
 * Can be used to create and access all type of messages.
 * The create methods are usually called by
 * {@link com.mockrunner.mock.jms.MockSession}.
 */
public class MessageManager
{
    private List messages;
    private List byteMessages;
    private List mapMessages;
    private List textMessages;
    private List streamMessages;
    private List objectMessages;
    
    public MessageManager()
    {
        messages = new ArrayList();
        byteMessages = new ArrayList();
        mapMessages = new ArrayList();
        textMessages = new ArrayList();
        streamMessages = new ArrayList();
        objectMessages = new ArrayList();
    }

    /**
     * Creates a new Message. Usually this method is called
     * by {@link com.mockrunner.mock.jms.MockSession#createMessage}.
     * @return the created Message
     */
    public MockMessage createMessage()
    {
        MockMessage message = new MockMessage();
        messages.add(message);
        return message;
    }
    
    /**
     * Returns a Message by its index or
     * null, if no such Message is
     * present.
     * @param index the index of the Message
     * @return the Message
     */
    public MockMessage getMessage(int index)
    {
        if(messages.size() <= index || index < 0) return null;
        return (MockMessage)messages.get(index);
    }
    
    /**
     * Returns the list of Message objects.
     * @return the Message list
     */
    public List getMessageList()
    {
        return Collections.unmodifiableList(messages);
    }
    
    /**
     * Creates a new BytesMessage. Usually this method is called
     * by {@link com.mockrunner.mock.jms.MockSession#createBytesMessage}.
     * @return the created BytesMessage
     */
    public MockBytesMessage createBytesMessage()
    {
        MockBytesMessage message = new MockBytesMessage();
        byteMessages.add(message);
        return message;
    }

    /**
     * Returns a BytesMessage by its index or
     * null, if no such BytesMessage is
     * present.
     * @param index the index of the BytesMessage
     * @return the BytesMessage
     */
    public MockBytesMessage getBytesMessage(int index)
    {
        if(byteMessages.size() <= index || index < 0) return null;
        return (MockBytesMessage)byteMessages.get(index);
    }
    
    /**
     * Returns the list of BytesMessage objects.
     * @return the BytesMessage list
     */
    public List getBytesMessageList()
    {
        return Collections.unmodifiableList(byteMessages);
    }
    
    /**
     * Creates a new MapMessage. Usually this method is called
     * by {@link com.mockrunner.mock.jms.MockSession#createMapMessage}.
     * @return the created MapMessage
     */
    public MockMapMessage createMapMessage()
    {
        MockMapMessage message = new MockMapMessage();
        mapMessages.add(message);
        return message;
    }

    /**
     * Returns a MapMessage by its index or
     * null, if no such MapMessage is
     * present.
     * @param index the index of the MapMessage
     * @return the MapMessage
     */
    public MockMapMessage getMapMessage(int index)
    {
        if(mapMessages.size() <= index || index < 0) return null;
        return (MockMapMessage)mapMessages.get(index);
    }
    
    /**
     * Returns the list of MapMessage objects.
     * @return the MapMessage list
     */
    public List getMapMessageList()
    {
        return Collections.unmodifiableList(mapMessages);
    }
    
    /**
     * Creates a new TextMessage. Usually this method is called
     * by {@link com.mockrunner.mock.jms.MockSession#createTextMessage}.
     * @return the created TextMessage
     */
    public MockTextMessage createTextMessage(String text)
    {
        MockTextMessage message = new MockTextMessage(text);
        textMessages.add(message);
        return message;
    }

    /**
     * Returns a TextMessage by its index or
     * null, if no such TextMessage is
     * present.
     * @param index the index of the TextMessage
     * @return the TextMessage
     */
    public MockTextMessage getTextMessage(int index)
    {
        if(textMessages.size() <= index || index < 0) return null;
        return (MockTextMessage)textMessages.get(index);
    }
    
    /**
     * Returns the list of TextMessage objects.
     * @return the TextMessage list
     */
    public List getTextMessageList()
    {
        return Collections.unmodifiableList(textMessages);
    }
    
    /**
     * Creates a new StreamMessage. Usually this method is called
     * by {@link com.mockrunner.mock.jms.MockSession#createStreamMessage}.
     * @return the created StreamMessage
     */
    public MockStreamMessage createStreamMessage()
    {
        MockStreamMessage message = new MockStreamMessage();
        streamMessages.add(message);
        return message;
    }

    /**
     * Returns a StreamMessage by its index or
     * null, if no such StreamMessage is
     * present.
     * @param index the index of the StreamMessage
     * @return the StreamMessage
     */
    public MockStreamMessage getStreamMessage(int index)
    {
        if(streamMessages.size() <= index || index < 0) return null;
        return (MockStreamMessage)streamMessages.get(index);
    }
    
    /**
     * Returns the list of StreamMessage objects.
     * @return the StreamMessage list
     */
    public List getStreamMessageList()
    {
        return Collections.unmodifiableList(streamMessages);
    }
    
    /**
     * Creates a new ObjectMessage. Usually this method is called
     * by {@link com.mockrunner.mock.jms.MockSession#createObjectMessage}.
     * @return the created ObjectMessage
     */
    public MockObjectMessage createObjectMessage(java.io.Serializable object)
    {
        MockObjectMessage message = new MockObjectMessage(object);
        objectMessages.add(message);
        return message;
    }

    /**
     * Returns a ObjectMessage by its index or
     * null, if no such ObjectMessage is
     * present.
     * @param index the index of the ObjectMessage
     * @return the ObjectMessage
     */
    public MockObjectMessage getObjectMessage(int index)
    {
        if(objectMessages.size() <= index || index < 0) return null;
        return (MockObjectMessage)objectMessages.get(index);
    }
    
    /**
     * Returns the list of ObjectMessage objects.
     * @return the ObjectMessage list
     */
    public List getObjectMessageList()
    {
        return Collections.unmodifiableList(objectMessages);
    }
}