TAudioInputStream.java

/*
 *	TAudioInputStream.java
 *
 *	This file is part of Tritonus: http://www.tritonus.org/
 */

/*
 *  Copyright (c) 2003 by Matthias Pfisterer
 *  Copyright (c) 2012 by fireandfuel from Cuina Team (http://www.cuina.byethost12.com/)
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as published
 *   by the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package sound.tritonus;

import java.io.InputStream;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;

/**
 * AudioInputStream base class. This class implements "dynamic" properties.
 * "Dynamic" properties are properties that may change during the life time of
 * the objects. This is typically used to pass information like the current
 * frame number, volume of subbands and similar values. "Dynamic" properties are
 * different from properties in AudioFormat and AudioFileFormat, which are
 * considered "static", as they aren't allowed to change after creating of the
 * object, thereby maintaining the immutable character of these classes.
 */

public class TAudioInputStream extends AudioInputStream
{
	private Map<String, Object> m_properties;
	private Map<String, Object> m_unmodifiableProperties;

	/**
	 * Constructor without properties. Creates an empty properties map.
	 */
	public TAudioInputStream(InputStream inputStream, AudioFormat audioFormat, long lLengthInFrames)
	{
		super(inputStream, audioFormat, lLengthInFrames);
		initMaps(new HashMap<String, Object>());
	}

	/**
	 * Constructor with properties. The passed properties map is not copied.
	 * This allows subclasses to change values in the map after creation, and
	 * the changes are reflected in the map the application program can obtain.
	 */
	public TAudioInputStream(InputStream inputStream, AudioFormat audioFormat,
			long lLengthInFrames, Map<String, Object> properties)
	{
		super(inputStream, audioFormat, lLengthInFrames);
		initMaps(properties);
	}

	private void initMaps(Map<String, Object> properties)
	{
		/*
		 * Here, we make a shallow copy of the map. It's unclear if this is
		 * sufficient (of if a deep copy should be made).
		 */
		m_properties = properties;
		m_unmodifiableProperties = Collections.unmodifiableMap(m_properties);
	}

	/**
	 * Obtain a Map containing the properties. This method returns a Map that
	 * cannot be modified by the application program, but reflects changes to
	 * the map made by the implementation.
	 * 
	 * @return a map containing the properties.
	 */
	public Map<String, Object> properties()
	{
		return m_unmodifiableProperties;
	}

	/**
	 * Set a property. Unlike in AudioFormat and AudioFileFormat, this method
	 * may be used anywhere by subclasses - it is not restricted to be used in
	 * the constructor.
	 */
	protected void setProperty(String key, Object value)
	{
		m_properties.put(key, value);
	}
}

/*** TAudioInputStream.java ***/