EncoderPhidget.java

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/*
 * Copyright 2006 Phidgets Inc.  All rights reserved.
 */

package com.phidgets;
import java.util.Iterator;
import java.util.LinkedList;
import com.phidgets.event.*;
public final class EncoderPhidget extends Phidget
{
        public EncoderPhidget () throws PhidgetException
        {
                super (create ());
        }
        private static native long create () throws PhidgetException;
        public native int getEncoderCount () throws PhidgetException;
        public native int getInputCount () throws PhidgetException;
        public native int getPosition (int index) throws PhidgetException;
        public native int getIndexPosition (int index) throws PhidgetException;
        public native int getEncoderPosition (int index) throws PhidgetException;
        public native void setPosition (int index, int position) throws PhidgetException;
        public native void setEncoderPosition (int index, int position) throws PhidgetException;
        public native boolean getInputState (int index) throws PhidgetException;
        public native boolean getEnabled (int index) throws PhidgetException;
        public native void setEnabled (int index, boolean state) throws PhidgetException;

        private final void enableDeviceSpecificEvents (boolean b)
        {
                enableEncoderPositionChangeEvents (b && encoderPositionChangeListeners.size () > 0);
                enableInputChangeEvents (b && inputChangeListeners.size () > 0);
        }
        public final void addEncoderPositionChangeListener (EncoderPositionChangeListener l)
        {
                synchronized (encoderPositionChangeListeners)
                {
                        encoderPositionChangeListeners.add (l);
                        enableEncoderPositionChangeEvents (true);
        }} private LinkedList encoderPositionChangeListeners = new LinkedList ();
        private long nativeEncoderPositionChangeHandler = 0;
        public final void removeEncoderPositionChangeListener (EncoderPositionChangeListener l)
        {
                synchronized (encoderPositionChangeListeners)
                {
                        encoderPositionChangeListeners.remove (l);
                        enableEncoderPositionChangeEvents (encoderPositionChangeListeners.size () > 0);
        }} private void fireEncoderPositionChange (EncoderPositionChangeEvent e)
        {
                synchronized (encoderPositionChangeListeners)
                {
                        for (Iterator it = encoderPositionChangeListeners.iterator (); it.hasNext ();)
                                ((EncoderPositionChangeListener) it.next ()).encoderPositionChanged (e);
                }
        }
        private native void enableEncoderPositionChangeEvents (boolean b);
        public final void addInputChangeListener (InputChangeListener l)
        {
                synchronized (inputChangeListeners)
                {
                        inputChangeListeners.add (l);
                        enableInputChangeEvents (true);
        }} private LinkedList inputChangeListeners = new LinkedList ();
        private long nativeInputChangeHandler = 0;
        public final void removeInputChangeListener (InputChangeListener l)
        {
                synchronized (inputChangeListeners)
                {
                        inputChangeListeners.remove (l);
                        enableInputChangeEvents (inputChangeListeners.size () > 0);
        }} private void fireInputChange (InputChangeEvent e)
        {
                synchronized (inputChangeListeners)
                {
                        for (Iterator it = inputChangeListeners.iterator (); it.hasNext ();)
                                ((InputChangeListener) it.next ()).inputChanged (e);
                }
        }
        private native void enableInputChangeEvents (boolean b);
}