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/**
* Copyright 1998-2001 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and
* redistribution of this file, and for a DISCLAIMER OF ALL
* WARRANTIES.
*/
package com.sun.speech.engine;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.Collection;
import java.util.EventObject;
import java.util.Iterator;
import javax.speech.EngineProperties;
import javax.speech.SpeechError;
import javax.speech.SpeechEvent;
/**
* Supports the JSAPI 1.0 <code>EngineProperties</code>
* interface.
*/
public abstract class BaseEngineProperties
implements EngineProperties, SpeechEventDispatcher {
/**
* List of <code>PropertyChangeListeners</code> registered for
* <code>PropertyChangeEvents</code> on this object.
*/
protected Collection propertyChangeListeners;
/**
* Class constructor.
*/
protected BaseEngineProperties() {
propertyChangeListeners = new java.util.ArrayList();
}
/**
* Obtains the AWT <code>Component</code> that provides the
* default user interface
* for setting the properties of the <code>Engine</code>
* associated with this object.
*
* @return an AWT <code>Component</code> to manipulate this object
*/
public java.awt.Component getControlComponent() {
return null;
}
/**
* Returns all properties to reasonable defaults
* for the <code>Engine</code>. A
* <code>PropertyChangeEvent</code> is issued
* for each property that changes as the reset takes effect.
*/
public abstract void reset();
/**
* Adds a <code>PropertyChangeListener</code> to the listener list.
*
* @param listener the <code>PropertyChangeListener</code> to add
*/
public void addPropertyChangeListener(PropertyChangeListener listener) {
if (!propertyChangeListeners.contains(listener)) {
propertyChangeListeners.add(listener);
}
}
/**
* Removes a <code>PropertyChangeListener</code> from the listener
* list.
*
* @param listener the <code>PropertyChangeListener</code> to remove
*/
public void removePropertyChangeListener(PropertyChangeListener listener) {
propertyChangeListeners.remove(listener);
}
/**
* Generates a
* <code>PropertyChangeEvent</code> for an <code>Object</code> value
* and posts it to the event queue. Eventually
* <code>firePropertyChangeEvent</code> will be called by
* <code>dispatchSpeechEvent</code> as a result of this action.
*
* @param propName the name of the property
* @param oldValue the old value
* @param newValue the new value
*
* @see #firePropertyChangeEvent
* @see #dispatchSpeechEvent
*/
protected void postPropertyChangeEvent(String propName,
Object oldValue,
Object newValue) {
EventObject e = new PropertyChangeEvent(this,
propName,
oldValue,
newValue);
SpeechEvent se = new SpeechEventWrapper(e);
SpeechEventUtilities.postSpeechEvent(this, se);
}
/**
* Generates a
* <code>PropertyChangeEvent</code> for a <code>float</code> value
* and posts it to the event queue. Eventually
* <code>firePropertyChangeEvent</code> will be called by
* <code>dispatchSpeechEvent</code> as a result of this action.
*
* @param propName the name of the property
* @param oldValue the old value
* @param newValue the new value
*
* @see #firePropertyChangeEvent
* @see #dispatchSpeechEvent
*/
protected void postPropertyChangeEvent(String propName,
float oldValue,
float newValue) {
EventObject e = new PropertyChangeEvent(this,
propName,
new Float(oldValue),
new Float(newValue));
SpeechEvent se = new SpeechEventWrapper(e);
SpeechEventUtilities.postSpeechEvent(this, se);
}
/**
* Generates a
* <code>PropertyChangeEvent</code> for a <code>int</code> value
* and posts it to the event queue. Eventually
* <code>firePropertyChangeEvent</code> will be called by
* <code>dispatchSpeechEvent</code> as a result of this action.
*
* @param propName the name of the property
* @param oldValue the old value
* @param newValue the new value
*
* @see #firePropertyChangeEvent
* @see #dispatchSpeechEvent
*/
protected void postPropertyChangeEvent(String propName,
int oldValue,
int newValue) {
EventObject e = new PropertyChangeEvent(this,
propName,
new Integer(oldValue),
new Integer(newValue));
SpeechEvent se = new SpeechEventWrapper(e);
SpeechEventUtilities.postSpeechEvent(this, se);
}
/**
* Generates a
* <code>PropertyChangeEvent</code> for a <code>boolean</code> value
* and posts it to the event queue. Eventually
* <code>firePropertyChangeEvent</code> will be called by
* <code>dispatchSpeechEvent</code> as a result of this action.
*
* @param propName the name of the property
* @param oldValue the old value
* @param newValue the new value
*
* @see #firePropertyChangeEvent
* @see #dispatchSpeechEvent
*/
protected void postPropertyChangeEvent(String propName,
boolean oldValue,
boolean newValue) {
EventObject e = new PropertyChangeEvent(this,
propName,
new Boolean(oldValue),
new Boolean(newValue));
SpeechEvent se = new SpeechEventWrapper(e);
SpeechEventUtilities.postSpeechEvent(this, se);
}
/**
* Sends a <code>PropertyChangeEvent</code>
* to all <code>PropertyChangeListeners</code> registered with
* this object. Called by <code>dispatchSpeechEvent</code>.
*
* @param event the <code>PropertyChangeEvent</code> to send
*
* @see #firePropertyChangeEvent
* @see #dispatchSpeechEvent
*/
public void firePropertyChangeEvent(PropertyChangeEvent event) {
if (propertyChangeListeners == null) {
return;
}
Iterator iterator = propertyChangeListeners.iterator();
while (iterator.hasNext()) {
PropertyChangeListener pl =
(PropertyChangeListener) iterator.next();
pl.propertyChange(event);
}
}
/**
* Dispatches a <code>PropertyChangeEvent</code>.
* The dispatcher should notify all <code>PropertyChangeListeners</code>
* from this method. The <code>SpeechEvent</code> was added
* via the various post methods of this class.
*
* @param event the <code>SpeechEvent</code> containing a
* <code>PropertyChangeEvent</code>
*
* @see #postPropertyChangeEvent
*/
public void dispatchSpeechEvent(SpeechEvent event) {
if (event instanceof SpeechEventWrapper) {
SpeechEventWrapper se = (SpeechEventWrapper)event;
PropertyChangeEvent pe =
(PropertyChangeEvent)(se.getEventObject());
firePropertyChangeEvent(pe);
}
else {
throw new SpeechError(
"BaseEngineProperties: speech event type error");
}
}
}
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