LoggerCollectorMessages.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.motorola.studio.android.logger.collector.util;

import java.text.MessageFormat;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

/**
 * Class to handle the messages. By default, all keys has the class name in its
 * prefix, plus a sequential number.
 */
public class LoggerCollectorMessages
{

    /**
     * The shared instance.
     */
    private static LoggerCollectorMessages instance = null;

    /**
     * Bundle to get messages from module (properties file).
     */
    private final ResourceBundle bundle;

    /**
     * Class used to get the message.
     */
    private Class<? extends Object> clazz;

    /**
     * Default constructor.
     */
    private LoggerCollectorMessages()
    {
        this.bundle = ResourceBundle.getBundle("loggerCollector"); //$NON-NLS-1$
    }

    /**
     * Returns the single instance.
     * 
     * @param clazz Class used to get the messages.
     * @return The singleton instance.
     */
    public static synchronized LoggerCollectorMessages getInstance(Class<? extends Object> clazz)
    {
        if (instance == null)
        {
            instance = new LoggerCollectorMessages();
        }
        instance.clazz = clazz;
        return instance;
    }

    /**
     * Returns the single instance.
     * 
     * @return The singleton instance.
     */
    public static synchronized LoggerCollectorMessages getInstance()
    {
        if (instance == null)
        {
            instance = new LoggerCollectorMessages();
        }
        instance.clazz = null;
        return instance;
    }

    /**
     * Returns the message of the given key.
     * 
     * @param key The message key
     * @return The message of the given key.
     */
    public String getString(String key)
    {
        try
        {
            return bundle
                    .getString(((this.clazz == null) ? "" : (this.clazz.getName() + ".")) + key); //$NON-NLS-1$ //$NON-NLS-2$
        }
        catch (MissingResourceException e)
        {
            return "!" + key + "!"; //$NON-NLS-1$ //$NON-NLS-2$
        }
    }

    /**
     * Returns the message of the given key.
     * 
     * @param key The message key
     * @param arguments Arguments to replace the pattern in the corresponding
     *            message of the key.
     * @return The message of the given key.
     */
    public String getString(String key, Object... arguments)
    {
        try
        {
            String message =
                    bundle.getString(((this.clazz == null) ? "" : (this.clazz.getName() + ".")) + key); //$NON-NLS-1$ //$NON-NLS-2$
            return MessageFormat.format(message, arguments);
        }
        catch (MissingResourceException e)
        {
            return "!" + key + "!"; //$NON-NLS-1$ //$NON-NLS-2$
        }
    }
}