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/*
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* Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.media.sound;
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import java.util.Vector;
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import javax.sound.sampled.AudioSystem;
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import javax.sound.sampled.Control;
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import javax.sound.sampled.Mixer;
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import javax.sound.sampled.Line;
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import javax.sound.sampled.LineEvent;
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import javax.sound.sampled.LineListener;
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import javax.sound.sampled.LineUnavailableException;
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/**
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* AbstractLine
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*
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* @author Kara Kytle
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*/
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abstract class AbstractLine implements Line {
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protected Line.Info info;
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protected Control[] controls;
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protected AbstractMixer mixer;
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private boolean open = false;
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private Vector listeners = new Vector();
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/**
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* Global event thread
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*/
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private static final EventDispatcher eventDispatcher;
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static {
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// create and start the global event thread
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// $$kk: 12.21.98:
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// 1) probably don't want a single global event queue
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// 2) need a way to stop this thread when the engine is done
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eventDispatcher = new EventDispatcher();
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eventDispatcher.start();
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}
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/**
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* Constructs a new AbstractLine.
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* @param mixer the mixer with which this line is associated
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* @param controls set of supported controls
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*/
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protected AbstractLine(Line.Info info, AbstractMixer mixer, Control[] controls) {
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if (controls == null) {
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controls = new Control[0];
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}
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this.info = info;
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this.mixer = mixer;
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this.controls = controls;
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}
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// LINE METHODS
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public Line.Info getLineInfo() {
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return info;
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}
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public boolean isOpen() {
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return open;
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}
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public void addLineListener(LineListener listener) {
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synchronized(listeners) {
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if ( ! (listeners.contains(listener)) ) {
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listeners.addElement(listener);
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}
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}
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}
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/**
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* Removes an audio listener.
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* @param listener listener to remove
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*/
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public void removeLineListener(LineListener listener) {
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listeners.removeElement(listener);
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}
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/**
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* Obtains the set of controls supported by the
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* line. If no controls are supported, returns an
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* array of length 0.
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* @return control set
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*/
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public Control[] getControls() {
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Control[] returnedArray = new Control[controls.length];
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for (int i = 0; i < controls.length; i++) {
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returnedArray[i] = controls[i];
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}
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return returnedArray;
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}
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public boolean isControlSupported(Control.Type controlType) {
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// protect against a NullPointerException
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if (controlType == null) {
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return false;
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}
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for (int i = 0; i < controls.length; i++) {
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if (controlType == controls[i].getType()) {
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return true;
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}
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}
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return false;
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}
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public Control getControl(Control.Type controlType) {
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// protect against a NullPointerException
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if (controlType != null) {
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for (int i = 0; i < controls.length; i++) {
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if (controlType == controls[i].getType()) {
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return controls[i];
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}
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}
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}
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throw new IllegalArgumentException("Unsupported control type: " + controlType);
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}
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// HELPER METHODS
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/**
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* This method sets the open state and generates
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* events if it changes.
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*/
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protected void setOpen(boolean open) {
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if (Printer.trace) Printer.trace("> "+getClass().getName()+" (AbstractLine): setOpen(" + open + ") this.open: " + this.open);
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boolean sendEvents = false;
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long position = getLongFramePosition();
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synchronized (this) {
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if (this.open != open) {
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this.open = open;
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sendEvents = true;
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}
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}
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if (sendEvents) {
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if (open) {
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sendEvents(new LineEvent(this, LineEvent.Type.OPEN, position));
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} else {
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sendEvents(new LineEvent(this, LineEvent.Type.CLOSE, position));
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}
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}
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if (Printer.trace) Printer.trace("< "+getClass().getName()+" (AbstractLine): setOpen(" + open + ") this.open: " + this.open);
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}
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/**
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* Send line events.
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*/
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protected void sendEvents(LineEvent event) {
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eventDispatcher.sendAudioEvents(event, listeners);
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}
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/**
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* This is an error in the API: getFramePosition
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* should return a long value. At CD quality,
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* the int value wraps around after 13 hours.
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*/
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public final int getFramePosition() {
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return (int) getLongFramePosition();
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}
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/**
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* Return the frame position in a long value
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* This implementation returns AudioSystem.NOT_SPECIFIED.
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*/
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public long getLongFramePosition() {
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return AudioSystem.NOT_SPECIFIED;
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}
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// $$kk: 06.03.99: returns the mixer used in construction.
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// this is a hold-over from when there was a public method like
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// this on line and should be fixed!!
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protected AbstractMixer getMixer() {
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return mixer;
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}
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protected EventDispatcher getEventDispatcher() {
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return eventDispatcher;
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}
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// ABSTRACT METHODS
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public abstract void open() throws LineUnavailableException;
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public abstract void close();
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}
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