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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 RFID Reader. All methods
* to read tags and set outputs on the RFID reader are implemented in this class.
* <p>
* The Phidget RFID reader can read one tag at a time. Both tag and tagloss event handlers are provided,
* as well as control over the antenna so that multiple readers can exist in close proximity without interference.
* 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 Phidgets Inc.
*/
public final class RFIDPhidget extends Phidget
{
public RFIDPhidget () throws PhidgetException
{
super (create ());
}
private static native long create () throws PhidgetException;
/**
* Returns the number of outputs. These are the outputs provided by the terminal block.
* Older RFID readers do not have these outputs, and this method will return 0.
* @return number of outputs
* @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 int getOutputCount () throws PhidgetException;
/**
* Returns the state of an output. True indicated activated, False deactivated, which is the default.
* @param index index of the output
* @return state of the output
* @throws PhidgetException If this Phidget is not opened and attached, or the index is out of range.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native boolean getOutputState (int index) throws PhidgetException;
/**
* Sets the state of a digital output. True indicated activated, False deactivated, which is the default.
* @param index index of the output
* @param state desired state
* @throws PhidgetException If this Phidget is not opened and attached, or the index is out of range.
* See {@link com.phidgets.Phidget#open(int) open} for information on determining if a device is attached.
*/
public native void setOutputState (int index, boolean state) throws PhidgetException;
/**
* Returns the state of the antenna. True indicated that the antenna is active, False indicated inactive.
* @return state of the antenna
* @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 boolean getAntennaOn () throws PhidgetException;
/**
* Sets the state of the antenna. True turns the antenna on, False turns it off. The antenna if by default
* turned off, and needs to be explicitely activated before tags can be read. Control over the antenna
* allows multiple readers to be used in close proximity, as multiple readers will interfere with each other if
* their antenna's are activated simultaneously.
* @param state new state for the antenna
* @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 setAntennaOn (boolean state) throws PhidgetException;
/**
* Returns the state of the onboard LED. This LED is by default turned off.
* @return state of the LED
* @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 boolean getLEDOn () throws PhidgetException;
/**
* Sets the state of the onboard LED. True turns the LED on, False turns it off. The LED is by default turned off.
* @param state new state for the LED
* @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 setLEDOn (boolean state) throws PhidgetException;
/**
* Returns the last tag read. This method will only return a valid tag after a tag has been seen.
* This method can be used even after a tag has been removed from the reader
* @return tag
* @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 String getLastTag () throws PhidgetException;
/**
* Returns the state of whether or not a tag is being read by the reader.
* True indicated that a tag is on (or near) the reader, false indicates that one is not.
* @return tag read state
* @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 boolean getTagStatus () throws PhidgetException;
private final void enableDeviceSpecificEvents (boolean b)
{
enableTagGainEvents (b && tagGainListeners.size () > 0);
enableTagLossEvents (b && tagLossListeners.size () > 0);
enableOutputChangeEvents (b && outputChangeListeners.size () > 0);
}
/**
* Adds a tag gained listener. The tag gaiend handler is a method that will be called when a new tag is
seen by the reader. The event is only fired one time for a new tag, so the tag has to be removed and then replaced before
another tag gained event will fire.
* <p>
* There is no limit on the number of tag gained change handlers that can be registered for a particular Phidget.
*
* @param l An implemetation of the {@link com.phidgets.event.TagGainListener TagGainListener} interface
*/
public final void addTagGainListener (TagGainListener l)
{
synchronized (tagGainListeners)
{
tagGainListeners.add (l);
enableTagGainEvents (true);
}} private LinkedList tagGainListeners = new LinkedList ();
private long nativeTagGainHandler = 0;
public final void removeTagGainListener (TagGainListener l)
{
synchronized (tagGainListeners)
{
tagGainListeners.remove (l);
enableTagGainEvents (tagGainListeners.size () > 0);
}} private void fireTagGain (TagGainEvent e)
{
synchronized (tagGainListeners)
{
for (Iterator it = tagGainListeners.iterator (); it.hasNext ();)
((TagGainListener) it.next ()).tagGained (e);
}
}
private native void enableTagGainEvents (boolean b);
/**
* Adds a tag lost listener. The tag lost handler is a method that will be called when a tag is
removed from the reader.
* <p>
* There is no limit on the number of tag lost change handlers that can be registered for a particular Phidget.
*
* @param l An implemetation of the {@link com.phidgets.event.TagLossListener TagLossListener} interface
*/
public final void addTagLossListener (TagLossListener l)
{
synchronized (tagLossListeners)
{
tagLossListeners.add (l);
enableTagLossEvents (true);
}} private LinkedList tagLossListeners = new LinkedList ();
private long nativeTagLossHandler = 0;
public final void removeTagLossListener (TagLossListener l)
{
synchronized (tagLossListeners)
{
tagLossListeners.remove (l);
enableTagLossEvents (tagLossListeners.size () > 0);
}} private void fireTagLoss (TagLossEvent e)
{
synchronized (tagLossListeners)
{
for (Iterator it = tagLossListeners.iterator (); it.hasNext ();)
((TagLossListener) it.next ()).tagLost (e);
}
}
private native void enableTagLossEvents (boolean b);
/**
* Adds an output change listener. The output change handler is a method that will be called when an output has changed.
* <p>
* There is no limit on the number of output change handlers that can be registered for a particular Phidget.
*
* @param l An implemetation of the {@link com.phidgets.event.OutputChangeListener OutputChangeListener} interface
*/
public final void addOutputChangeListener (OutputChangeListener l)
{
synchronized (outputChangeListeners)
{
outputChangeListeners.add (l);
enableOutputChangeEvents (true);
}} private LinkedList outputChangeListeners = new LinkedList ();
private long nativeOutputChangeHandler = 0;
public final void removeOutputChangeListener (OutputChangeListener l)
{
synchronized (outputChangeListeners)
{
outputChangeListeners.remove (l);
enableOutputChangeEvents (outputChangeListeners.size () > 0);
}} private void fireOutputChange (OutputChangeEvent e)
{
synchronized (outputChangeListeners)
{
for (Iterator it = outputChangeListeners.iterator (); it.hasNext ();)
((OutputChangeListener) it.next ()).outputChanged (e);
}
}
private native void enableOutputChangeEvents (boolean b);
}
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