/* * Copyright (c) 1999, 2003, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.sound.sampled; /** * The <code>LineEvent</code> class encapsulates information that a line * sends its listeners whenever the line opens, closes, starts, or stops. * Each of these four state changes is represented by a corresponding * type of event. A listener receives the event as a parameter to its * {@link LineListener#update update} method. By querying the event, * the listener can learn the type of event, the line responsible for * the event, and how much data the line had processed when the event occurred. * * <p>Although this class implements Serializable, attempts to * serialize a <code>LineEvent</code> object will fail. * * @author Kara Kytle * * @see Line * @see LineListener#update * @since 1.3 * * @serial exclude */public class LineEvent extends java.util.EventObject { // INSTANCE VARIABLES /** * The kind of line event (<code>OPEN</code>, <code>CLOSE</code>, * <code>START</code>, or <code>STOP</code>). * @see #getType * @serial */ private final Type type; /** * The media position when the event occurred, expressed in sample frames. * Note that this field is only relevant to certain events generated by * data lines, such as <code>START</code> and <code>STOP</code>. For * events generated by lines that do not count sample frames, and for any * other events for which this value is not known, the position value * should be {@link AudioSystem#NOT_SPECIFIED}. * @serial * @see #getFramePosition */ private final long position; /** * Constructs a new event of the specified type, originating from the specified line. * @param line the source of this event * @param type the event type (<code>OPEN</code>, <code>CLOSE</code>, <code>START</code>, or <code>STOP</code>) * @param position the number of sample frames that the line had already processed when the event occurred, * or {@link AudioSystem#NOT_SPECIFIED} * * @throws IllegalArgumentException if <code>line</code> is * <code>null</code>. */ public LineEvent(Line line, Type type, long position) { super(line); this.type = type; this.position = position; } /** * Obtains the audio line that is the source of this event. * @return the line responsible for this event */ public final Line getLine() { return (Line)getSource(); } /** * Obtains the event's type. * @return this event's type ({@link Type#OPEN}, {@link Type#CLOSE}, * {@link Type#START}, or {@link Type#STOP}) */ public final Type getType() { return type; } /** * Obtains the position in the line's audio data when the event occurred, expressed in sample frames. * For example, if a source line had already played back 14 sample frames at the time it was * paused, the pause event would report the line's position as 14. The next frame to be processed * would be frame number 14 using zero-based numbering, or 15 using one-based numbering. * <p> * Note that this field is relevant only to certain events generated by * data lines, such as <code>START</code> and <code>STOP</code>. For * events generated by lines that do not count sample frames, and for any * other events for which this value is not known, the position value * should be {@link AudioSystem#NOT_SPECIFIED}. * * @return the line's position as a sample frame number */ /* * $$kk: 04.20.99: note to myself: should make sure our implementation is consistent with this. * which is a reasonable definition.... */ public final long getFramePosition() { return position; } /** * Obtains a string representation of the event. The contents of the string may vary * between implementations of Java Sound. * @return a string describing the event. */ public String toString() { String sType = ""; if (type != null) sType = type.toString()+" "; String sLine; if (getLine() == null) { sLine = "null"; } else { sLine = getLine().toString(); } return new String(sType + "event from line " + sLine); } /** * The LineEvent.Type inner class identifies what kind of event occurred on a line. * Static instances are provided for the common types (OPEN, CLOSE, START, and STOP). * * @see LineEvent#getType() */ public static class Type { /** * Type name. */ // $$kk: 03.25.99: why can't this be final?? private /*final*/ String name; /** * Constructs a new event type. * @param name name of the type */ protected Type(String name) { this.name = name; } //$$fb 2002-11-26: fix for 4695001: SPEC: description of equals() method contains typo /** * Indicates whether the specified object is equal to this event type, * returning <code>true</code> if the objects are identical. * @param obj the reference object with which to compare * @return <code>true</code> if this event type is the same as * <code>obj</code>; <code>false</code> otherwise */ public final boolean equals(Object obj) { return super.equals(obj); } /** * Finalizes the hashcode method. */ public final int hashCode() { return super.hashCode(); } /** * Returns the type name as the string representation. */ public String toString() { return name; } // LINE EVENT TYPE DEFINES /** * A type of event that is sent when a line opens, reserving system * resources for itself. * @see #CLOSE * @see Line#open */ public static final Type OPEN = new Type("Open"); /** * A type of event that is sent when a line closes, freeing the system * resources it had obtained when it was opened. * @see #OPEN * @see Line#close */ public static final Type CLOSE = new Type("Close"); /** * A type of event that is sent when a line begins to engage in active * input or output of audio data in response to a * {@link DataLine#start start} request. * @see #STOP * @see DataLine#start */ public static final Type START = new Type("Start"); /** * A type of event that is sent when a line ceases active input or output * of audio data in response to a {@link DataLine#stop stop} request, * or because the end of media has been reached. * @see #START * @see DataLine#stop */ public static final Type STOP = new Type("Stop"); /** * A type of event that is sent when a line ceases to engage in active * input or output of audio data because the end of media has been reached. */ /* * ISSUE: we may want to get rid of this. Is JavaSound * responsible for reporting this?? * * [If it's decided to keep this API, the docs will need to be updated to include mention * of EOM events elsewhere.] */ //public static final Type EOM = new Type("EOM"); /** * A type of event that is sent when a line begins to engage in active * input or output of audio data. Examples of when this happens are * when a source line begins or resumes writing data to its mixer, and * when a target line begins or resumes reading data from its mixer. * @see #STOP * @see SourceDataLine#write * @see TargetDataLine#read * @see DataLine#start */ //public static final Type ACTIVE = new Type("ACTIVE"); /** * A type of event that is sent when a line ceases active input or output * of audio data. * @see #START * @see DataLine#stop */ //public static final Type INACTIVE = new Type("INACTIVE"); } // class Type } // class LineEvent
/*
* Copyright (c) 1999, 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.sound.sampled;
/**
* The <code>LineEvent</code> class encapsulates information that a line
* sends its listeners whenever the line opens, closes, starts, or stops.
* Each of these four state changes is represented by a corresponding
* type of event. A listener receives the event as a parameter to its
* {@link LineListener#update update} method. By querying the event,
* the listener can learn the type of event, the line responsible for
* the event, and how much data the line had processed when the event occurred.
*
* <p>Although this class implements Serializable, attempts to
* serialize a <code>LineEvent</code> object will fail.
*
* @author Kara Kytle
*
* @see Line
* @see LineListener#update
* @since 1.3
*
* @serial exclude
*/
public class LineEvent extends java.util.EventObject {
// INSTANCE VARIABLES
/**
* The kind of line event (<code>OPEN</code>, <code>CLOSE</code>,
* <code>START</code>, or <code>STOP</code>).
* @see #getType
* @serial
*/
private final Type type;
/**
* The media position when the event occurred, expressed in sample frames.
* Note that this field is only relevant to certain events generated by
* data lines, such as <code>START</code> and <code>STOP</code>. For
* events generated by lines that do not count sample frames, and for any
* other events for which this value is not known, the position value
* should be {@link AudioSystem#NOT_SPECIFIED}.
* @serial
* @see #getFramePosition
*/
private final long position;
/**
* Constructs a new event of the specified type, originating from the specified line.
* @param line the source of this event
* @param type the event type (<code>OPEN</code>, <code>CLOSE</code>, <code>START</code>, or <code>STOP</code>)
* @param position the number of sample frames that the line had already processed when the event occurred,
* or {@link AudioSystem#NOT_SPECIFIED}
*
* @throws IllegalArgumentException if <code>line</code> is
* <code>null</code>.
*/
public LineEvent(Line line, Type type, long position) {
super(line);
this.type = type;
this.position = position;
}
/**
* Obtains the audio line that is the source of this event.
* @return the line responsible for this event
*/
public final Line getLine() {
return (Line)getSource();
}
/**
* Obtains the event's type.
* @return this event's type ({@link Type#OPEN}, {@link Type#CLOSE},
* {@link Type#START}, or {@link Type#STOP})
*/
public final Type getType() {
return type;
}
/**
* Obtains the position in the line's audio data when the event occurred, expressed in sample frames.
* For example, if a source line had already played back 14 sample frames at the time it was
* paused, the pause event would report the line's position as 14. The next frame to be processed
* would be frame number 14 using zero-based numbering, or 15 using one-based numbering.
* <p>
* Note that this field is relevant only to certain events generated by
* data lines, such as <code>START</code> and <code>STOP</code>. For
* events generated by lines that do not count sample frames, and for any
* other events for which this value is not known, the position value
* should be {@link AudioSystem#NOT_SPECIFIED}.
*
* @return the line's position as a sample frame number
*/
/*
* $$kk: 04.20.99: note to myself: should make sure our implementation is consistent with this.
* which is a reasonable definition....
*/
public final long getFramePosition() {
return position;
}
/**
* Obtains a string representation of the event. The contents of the string may vary
* between implementations of Java Sound.
* @return a string describing the event.
*/
public String toString() {
String sType = "";
if (type != null) sType = type.toString()+" ";
String sLine;
if (getLine() == null) {
sLine = "null";
} else {
sLine = getLine().toString();
}
return new String(sType + "event from line " + sLine);
}
/**
* The LineEvent.Type inner class identifies what kind of event occurred on a line.
* Static instances are provided for the common types (OPEN, CLOSE, START, and STOP).
*
* @see LineEvent#getType()
*/
public static class Type {
/**
* Type name.
*/
// $$kk: 03.25.99: why can't this be final??
private /*final*/ String name;
/**
* Constructs a new event type.
* @param name name of the type
*/
protected Type(String name) {
this.name = name;
}
//$$fb 2002-11-26: fix for 4695001: SPEC: description of equals() method contains typo
/**
* Indicates whether the specified object is equal to this event type,
* returning <code>true</code> if the objects are identical.
* @param obj the reference object with which to compare
* @return <code>true</code> if this event type is the same as
* <code>obj</code>; <code>false</code> otherwise
*/
public final boolean equals(Object obj) {
return super.equals(obj);
}
/**
* Finalizes the hashcode method.
*/
public final int hashCode() {
return super.hashCode();
}
/**
* Returns the type name as the string representation.
*/
public String toString() {
return name;
}
// LINE EVENT TYPE DEFINES
/**
* A type of event that is sent when a line opens, reserving system
* resources for itself.
* @see #CLOSE
* @see Line#open
*/
public static final Type OPEN = new Type("Open");
/**
* A type of event that is sent when a line closes, freeing the system
* resources it had obtained when it was opened.
* @see #OPEN
* @see Line#close
*/
public static final Type CLOSE = new Type("Close");
/**
* A type of event that is sent when a line begins to engage in active
* input or output of audio data in response to a
* {@link DataLine#start start} request.
* @see #STOP
* @see DataLine#start
*/
public static final Type START = new Type("Start");
/**
* A type of event that is sent when a line ceases active input or output
* of audio data in response to a {@link DataLine#stop stop} request,
* or because the end of media has been reached.
* @see #START
* @see DataLine#stop
*/
public static final Type STOP = new Type("Stop");
/**
* A type of event that is sent when a line ceases to engage in active
* input or output of audio data because the end of media has been reached.
*/
/*
* ISSUE: we may want to get rid of this. Is JavaSound
* responsible for reporting this??
*
* [If it's decided to keep this API, the docs will need to be updated to include mention
* of EOM events elsewhere.]
*/
//public static final Type EOM = new Type("EOM");
/**
* A type of event that is sent when a line begins to engage in active
* input or output of audio data. Examples of when this happens are
* when a source line begins or resumes writing data to its mixer, and
* when a target line begins or resumes reading data from its mixer.
* @see #STOP
* @see SourceDataLine#write
* @see TargetDataLine#read
* @see DataLine#start
*/
//public static final Type ACTIVE = new Type("ACTIVE");
/**
* A type of event that is sent when a line ceases active input or output
* of audio data.
* @see #START
* @see DataLine#stop
*/
//public static final Type INACTIVE = new Type("INACTIVE");
} // class Type
} // class LineEvent