Led.java

/**
 * Copyright (c) 2010-2016 by the respective copyright holders.
 *
 * 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.openhab.binding.lcn.mappingtarget;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.openhab.binding.lcn.common.LcnAddr;
import org.openhab.binding.lcn.common.LcnAddrMod;
import org.openhab.binding.lcn.common.LcnDefs;
import org.openhab.binding.lcn.common.PckGenerator;
import org.openhab.binding.lcn.connection.Connection;
import org.openhab.binding.lcn.connection.ModInfo;
import org.openhab.binding.lcn.input.ModStatusBinSensors;
import org.openhab.binding.lcn.input.ModStatusKeyLocks;
import org.openhab.binding.lcn.input.ModStatusLedsAndLogicOps;
import org.openhab.binding.lcn.input.ModStatusOutput;
import org.openhab.binding.lcn.input.ModStatusRelays;
import org.openhab.binding.lcn.input.ModStatusVar;
import org.openhab.core.events.EventPublisher;
import org.openhab.core.items.Item;
import org.openhab.core.library.types.OnOffType;
import org.openhab.core.types.Command;

/**
 * Changes the state of an LED.
 *
 * @author Tobias J�ttner
 */
public class Led extends TargetWithLcnAddr {

    /** Pattern to parse LED commands. */
    private static final Pattern PATTERN_LED = Pattern.compile(
            "(?<ledId>\\d+)\\.(?<action>(OFF)|(ON)|(BLINK)|(FLICKER))",
            Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);

    /** 0..11 */
    private final int ledId;

    /** Target LED state. */
    private final LcnDefs.LedStatus state;

    /**
     * Constructor.
     * 
     * @param addr the target LCN address
     * @param ledId 0..11
     * @param state the state to set
     */
    Led(LcnAddr addr, int ledId, LcnDefs.LedStatus state) {
        super(addr);
        this.ledId = ledId;
        this.state = state;
    }

    /**
     * Tries to parse the given input text.
     * 
     * @param input the text to parse
     * @return the parsed {@link Led} or null
     */
    static Target tryParseTarget(String input) {
        CmdAndAddressRet header = CmdAndAddressRet.parse(input, true);
        if (header != null) {
            Matcher matcher;
            switch (header.getCmd().toUpperCase()) {
                case "LED":
                    if ((matcher = PATTERN_LED.matcher(header.getRestInput())).matches()) {
                        int ledId = Integer.parseInt(matcher.group("ledId")) - 1;
                        if (ledId < 12) {
                            LcnDefs.LedStatus state;
                            switch (matcher.group("action").toUpperCase()) {
                                case "OFF":
                                    state = LcnDefs.LedStatus.OFF;
                                    break;
                                case "ON":
                                    state = LcnDefs.LedStatus.ON;
                                    break;
                                case "BLINK":
                                    state = LcnDefs.LedStatus.BLINK;
                                    break;
                                case "FLICKER":
                                    state = LcnDefs.LedStatus.FLICKER;
                                    break;
                                default:
                                    throw new Error();
                            }
                            return new Led(header.getAddr(), ledId, state);
                        }
                    }
                    break;
            }
        }
        return null;
    }

    /** {@inheritDoc} */
    @Override
    public void send(Connection conn, Item item, Command cmd) {
        conn.queue(this.addr, !this.addr.isGroup(), PckGenerator.controlLed(this.ledId, this.state));
        // Force status update (status is polled and should be updated now)
        if (!this.addr.isGroup()) {
            ModInfo info = conn.getModInfo((LcnAddrMod) this.addr);
            if (info != null) {
                info.requestStatusLedsAndLogicOps.nextRequestIn(ModInfo.STATUS_REQUEST_DELAY_AFTER_COMMAND_MSEC,
                        System.nanoTime());
            }
        }
    }

    /** {@inheritDoc} */
    @Override
    public void register(Connection conn) {
        if (!this.addr.isGroup()) {
            ModInfo info = conn.updateModuleData((LcnAddrMod) this.addr);
            if (!info.requestStatusLedsAndLogicOps.isActive()) {
                info.requestStatusLedsAndLogicOps.nextRequestIn(0, System.nanoTime());
            }
        }
    }

    /** {@inheritDoc} */
    @Override
    public boolean visualizationHandleOutputStatus(ModStatusOutput pchkInput, Command cmd, Item item,
            EventPublisher eventPublisher) {
        return false;
    }

    /** {@inheritDoc} */
    @Override
    public boolean visualizationHandleRelaysStatus(ModStatusRelays pchkInput, Command cmd, Item item,
            EventPublisher eventPublisher) {
        return false;
    }

    /** {@inheritDoc} */
    @Override
    public boolean visualizationBinSensorsStatus(ModStatusBinSensors pchkInput, Command cmd, Item item,
            EventPublisher eventPublisher) {
        return false;
    }

    /** {@inheritDoc} */
    @Override
    public boolean visualizationVarStatus(ModStatusVar pchkInput, Command cmd, Item item,
            EventPublisher eventPublisher) {
        return false;
    }

    /**
     * Visualization for {@link OnOffType}.
     * {@inheritDoc}
     */
    @Override
    public boolean visualizationLedsAndLogicOpsStatus(ModStatusLedsAndLogicOps pchkInput, Command cmd, Item item,
            EventPublisher eventPublisher) {
        // We are actually not meant to visualize anything.
        // But (just in case) someone is really lazy in doing the item-definitions, we try to be helpful by implementing
        // some ON/OFF logic.
        if (pchkInput.getLogicalSourceAddr().equals(this.addr)
                && item.getAcceptedDataTypes().contains(OnOffType.class)) {
            // Only update if the state we are bound to is equal to the reported one
            if (this.state == pchkInput.getLedState(this.ledId)) {
                eventPublisher.postUpdate(item.getName(), cmd == OnOffType.ON ? OnOffType.ON : OnOffType.OFF);
                return true;
            }
        }
        return false;
    }

    /** {@inheritDoc} */
    @Override
    public boolean visualizationKeyLocksStatus(ModStatusKeyLocks pchkInput, Command cmd, Item item,
            EventPublisher eventPublisher) {
        return false;
    }

}