StateCache.java

/**
 * Copyright (c) 2010-2016, 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.openhab.binding.fatekplc.internal;

import java.util.HashMap;
import java.util.Map;

import org.openhab.binding.fatekplc.items.FatekPLCItem;
import org.openhab.core.types.State;

/**
 * Implementing cache state.
 *
 * @author Slawomir Jaranowski
 * @since 1.9.0
 */
class StateCache {

    private Map<String, State> cache = new HashMap<>();

    boolean isStateChange(FatekPLCItem item, State newState) {

        State oldState = cache.get(item.getItemName());

        if (newState != null && newState.equals(oldState)) {
            return false;
        } else {
            cache.put(item.getItemName(), newState);
            return true;
        }
    }
}