DyIOInputStream.java

Go to the documentation of this file.

/*******************************************************************************
 * Copyright 2010 Neuron Robotics, LLC
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package com.neuronrobotics.sdk.dyio;
 
import java.io.IOException;
import java.io.InputStream;
 
import com.neuronrobotics.sdk.common.ByteList;
 
// TODO: Auto-generated Javadoc
public class DyIOInputStream extends InputStream {
 
    private ByteList buffer = new ByteList();
    
    DyIOChannel chan;
    
    public DyIOInputStream(DyIOChannel channel) {
        chan = channel;
    }
    
    public void write(ByteList data) {
        synchronized (buffer) {
            buffer.add(data);
        }
    }
 
    /* (non-Javadoc)
     * @see java.io.InputStream#read()
     */
    @Override
    public int read() throws IOException {
        while(chan.getMode() == DyIOChannelMode.USART_RX) {
            if(available() > 0) {
                // cast the poped byte as an int to make sure its positive
                Byte val = buffer.pop();
                
                if(val == null) {
                    continue;
                }
                
                return (int) val;
            }
        }
        
        return -1;
    }
    
    /* (non-Javadoc)
     * @see java.io.InputStream#available()
     */
    @Override
    public int available() {
        return buffer.size();
    }
}