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/*
* Copyright 2012 Phidgets Inc. All rights reserved.
*/
package com.phidgets;
import java.util.Iterator;
import java.util.LinkedList;
import com.phidgets.event.*;
/**
* This class represents a Phidget Weight Sensor. All methods
* to read weight data from the weight sensor are implemented in this class.
* <p>
* The Phidget Weight Sensor is simply an electronic scale with a USB interface.
* It provides one weight value, in kg.
* See your device's User Guide for more specific API details,
* technical information, and revision details. The User Guide, along with other resources, can be found on
* the product page for your device.
*
* @author Phidget Inc.
*/
public final class WeightSensorPhidget extends Phidget
{
public WeightSensorPhidget () throws PhidgetException
{
super (create ());
}
private static native long create () throws PhidgetException;
/**
* Returns the sensed weight in kg. This weight is in kg (kilograms), but can
* easily be converted into other units. The accuracy, sesitivity and range depends on the scale and version.
*
* @return The sensed weight
* @throws PhidgetException If this Phidget is not opened and attached.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native double getWeight () throws PhidgetException;
/**
* Sets the weight change trigger. This is the ammount by which the sensed weight must
* change between WeightChangeEvents. By default this is set to 5.
*
* @param newVal The new trigger value
* @throws PhidgetException If this Phidget is not opened and attached.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native void setWeightChangeTrigger (double newVal) throws PhidgetException;
/**
* Returns the weight change trigger. This is the ammount by which the sensed weight must
* change between WeightChangeEvents. By default this is set to 5.
*
* @return The trigger value
* @throws PhidgetException If this Phidget is not opened and attached.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native double getWeightChangeTrigger () throws PhidgetException;
private final void enableDeviceSpecificEvents (boolean b)
{
enableWeightChangeEvents (b && weightChangeListeners.size () > 0);
}
/**
* Adds a weight change listener. The weight change handler is a method that will be called when the weight
* has changed by at least the {@link #getWeightChangeTrigger() Trigger} that has been set.
* <p>
* There is no limit on the number of weight change handlers that can be registered for a particular Phidget.
*
* @param l An implemetation of the {@link com.phidgets.event.WeightChangeListener WeightChangeListener} interface
*/
public final void addWeightChangeListener (WeightChangeListener l)
{
synchronized (weightChangeListeners)
{
weightChangeListeners.add (l);
enableWeightChangeEvents (true);
}} private LinkedList weightChangeListeners = new LinkedList ();
private long nativeWeightChangeHandler = 0;
public final void removeWeightChangeListener (WeightChangeListener l)
{
synchronized (weightChangeListeners)
{
weightChangeListeners.remove (l);
enableWeightChangeEvents (weightChangeListeners.size () > 0);
}} private void fireWeightChange (WeightChangeEvent e)
{
synchronized (weightChangeListeners)
{
for (Iterator it = weightChangeListeners.iterator (); it.hasNext ();)
((WeightChangeListener) it.next ()).weightChanged (e);
}
}
private native void enableWeightChangeEvents (boolean b);
}
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