Connection.java

/**
 * Copyright (c) 2010-2015, openHAB.org and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */

package org.octoller.devicecom;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;

import org.openhab.binding.octoller.internal.OctollerBindingConfig;
import org.openhab.core.events.EventPublisher;
import org.openhab.core.library.types.OnOffType;
import org.openhab.core.library.types.PercentType;

/**
 * openHAB binding for octoller (www.octoller.com) For use with octoller-Gateway
 *
 * @author JPlenert
 * @since 1.8.0
 */
public class Connection {

    Socket socket;
    InetAddress address;
    OutputStream outStream;
    InputStream inStream;

    public Connection(String nameOrAddress) throws IOException {
        address = InetAddress.getByName(nameOrAddress);
        socket = new Socket(address, 2300);
        outStream = socket.getOutputStream();
        inStream = socket.getInputStream();
    }

    public String doCommand(String command) throws IOException {
        ByteBuffer b = ByteBuffer.allocate(4).order(ByteOrder.LITTLE_ENDIAN);
        b.putInt(command.length());
        outStream.write(b.array(), 0, 4); // length
        outStream.write(command.getBytes()); // data

        byte[] buffer = new byte[4];
        inStream.read(buffer, 0, 4);
        b = ByteBuffer.wrap(buffer).order(ByteOrder.LITTLE_ENDIAN);
        int len = b.getInt();
        buffer = new byte[len];
        inStream.read(buffer, 0, len);
        return new String(buffer, "UTF-8");
    }

    public void close() throws IOException {
        socket.close();
    }

    public void processResultToPublisher(EventPublisher eventPublisher, String itemName, String result) {
        if (result.equals("Up")) {
            eventPublisher.postUpdate(itemName, new PercentType(0));
        } else if (result.equals("Down")) {
            eventPublisher.postUpdate(itemName, new PercentType(100));
        } else if (result.equals("Unknown")) {
            eventPublisher.postUpdate(itemName, new PercentType(50));
        } else if (result.equals("On")) {
            eventPublisher.postUpdate(itemName, OnOffType.ON);
        } else if (result.equals("Off")) {
            eventPublisher.postUpdate(itemName, OnOffType.OFF);
        }
    }

    public String buildCommandString(OctollerBindingConfig config, String commandType, String command) {
        StringBuilder sb = new StringBuilder();
        sb.append("DeviceHost=");
        sb.append(config.DeviceHost);
        sb.append("|");
        sb.append("CommandType=");
        sb.append(commandType);
        sb.append("|");
        sb.append("Command=");
        sb.append(command);
        sb.append("|");

        if (config.BlockID != 0) {
            sb.append("BlockID=");
            sb.append(config.BlockID);
            sb.append("|");
        }

        if (config.BlockName != null) {
            sb.append("BlockName=");
            sb.append(config.BlockName);
            sb.append("|");
        }

        return sb.toString();
    }

}