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This is a set of utilities and classes that I have found useful over the years. In my career spanning over a decade, I have time and again written the same code or some part of the code over and over again. I never found the time to collate the details in a reusable library. This project will be a collection of such files. The work that I have been doing is more than 5 years old, however the project has been conceived in 2011.

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/*******************************************************************************
 * Copyright 2011 @ Kapil Viren Ahuja
 * 
 * Licensed 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 com.kapil.framework.reader;

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

/**
 * 
 * Factory to initialize different kinds of message readers. This factory takes away the responsibility from the
 * consumer of the framework to initialize readers. Any change in underlying implementations will not impact application
 * code.
 * 
 */
public class MessageReaderFactory
{

    /** The INSTANCE. */
    private static MessageReaderFactory INSTANCE;


    /**
     * Only constructor which is made private, forcing a Singleton instance.
     */
    private MessageReaderFactory()
    {
    }


    /**
     * Gets the single instance of MessageReaderFactory.
     * 
     * @return instance of MessageReaderFactory
     */
    public static MessageReaderFactory getInstance()
    {
        if (INSTANCE == null)
        {
            INSTANCE = new MessageReaderFactory();
        }

        return INSTANCE;
    }


    /**
     * Creates a new instance of the {@link ResourceBundleMessageReader} for multiple data sources.
     * 
     * @param dataSources list of data sources needed to initialise the bundle reader
     * 
     * @return new instance of the {@link ResourceBundleMessageReader}
     */
    public IMessageReader getReader(String type, List dataSources)
    {
        if ("ResourceBundle".equals(type))
        {
            return new ResourceBundleMessageReader(dataSources);
        }
        else
        {
            throw new RuntimeException("Message Reader Factory can not return any instance of type [" + type + "]");
        }
    }


    /**
     * Creates a new instance of the {@link ResourceBundleMessageReader} for a single data source.
     * 
     * @param dataSource the data source
     * 
     * @return new instance of the {@link ResourceBundleMessageReader}
     */
    public IMessageReader getReader(String type, String dataSource)
    {
        List dataSourceList = new ArrayList();
        dataSourceList.add(dataSource);
        return getReader(type, dataSourceList);
    }


    /**
     * Creates a new instance of the {@link XMLConfigurationReader} for a single data source.
     * 
     * 
     * @param dataSource the data source
     * @return new instance of the {@link ResourceBundleMessageReader}
     */
    public IMessageReader getXmlConfigurationReader(final String dataSourceName)
    {
        return new XMLConfigurationReader(dataSourceName);
    }

}