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IOIOLib/src/ioio/lib/impl/DigitalInputImpl.java

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+/*
+ * Copyright 2011 Ytai Ben-Tsvi. All rights reserved.
+ *  
+ * 
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ * 
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ * 
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ARSHAN POURSOHI OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied.
+ */
+package ioio.lib.impl;
+
+import ioio.lib.api.DigitalInput;
+import ioio.lib.api.exception.ConnectionLostException;
+import ioio.lib.impl.IncomingState.InputPinListener;
+
+import java.io.IOException;
+
+public class DigitalInputImpl extends AbstractPin implements DigitalInput,
+		InputPinListener {
+	private boolean value_;
+	private boolean valid_ = false;
+
+	DigitalInputImpl(IOIOImpl ioio, int pin) throws ConnectionLostException {
+		super(ioio, pin);
+	}
+
+	@Override
+	synchronized public void setValue(int value) {
+		// Log.v("DigitalInputImpl", "Pin " + pinNum_ + " value is " + value);
+		assert (value == 0 || value == 1);
+		value_ = (value == 1);
+		if (!valid_) {
+			valid_ = true;
+		}
+		notifyAll();
+	}
+
+	synchronized public void waitForValue(boolean value)
+			throws InterruptedException, ConnectionLostException {
+		checkState();
+		while ((!valid_ || value_ != value) && state_ != State.DISCONNECTED) {
+			wait();
+		}
+		checkState();
+	}
+
+	@Override
+	synchronized public void close() {
+		super.close();
+		try {
+			ioio_.protocol_.setChangeNotify(pinNum_, false);
+		} catch (IOException e) {
+		}
+	}
+
+	@Override
+	synchronized public boolean read() throws InterruptedException,
+			ConnectionLostException {
+		checkState();
+		while (!valid_ && state_ != State.DISCONNECTED) {
+			wait();
+		}
+		checkState();
+		return value_;
+	}
+
+	@Override
+	public synchronized void disconnected() {
+		super.disconnected();
+		notifyAll();
+	}
+}