/*-
 * ============LICENSE_START=======================================================
 * ONAP-XACML
 * ================================================================================
 * Copyright (C) 2017, 2019 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.policy.xacml.std.pap;

import java.util.Collection;
import java.util.LinkedList;

import org.onap.policy.xacml.api.pap.OnapPDP;
import org.onap.policy.xacml.api.pap.OnapPDPGroup;

public class StdPDPItemSetChangeNotifier {

    private Collection<StdItemSetChangeListener> listeners = null;

    public interface StdItemSetChangeListener {

        public void changed();

        public void groupChanged(OnapPDPGroup group);

        public void pdpChanged(OnapPDP pdp);

    }

    /**
     * addItemSetChangeListener.
     *
     * @param listener StdItemSetChangeListener
     */
    public void addItemSetChangeListener(StdItemSetChangeListener listener) {
        if (this.listeners == null) {
            this.listeners = new LinkedList<>();
        }
        this.listeners.add(listener);
    }

    /**
     * removeItemSetChangeListener.
     *
     * @param listener StdItemSetChangeListener
     */
    public void removeItemSetChangeListener(StdItemSetChangeListener listener) {
        if (this.listeners != null) {
            this.listeners.remove(listener);
        }
    }

    /**
     * fireChanged.
     */
    public void fireChanged() {
        if (this.listeners == null) {
            return;
        }
        for (StdItemSetChangeListener l : this.listeners) {
            l.changed();
        }
    }

    /**
     * firePDPGroupChanged.
     *
     * @param group OnapPDPGroup
     */
    public void firePDPGroupChanged(OnapPDPGroup group) {
        if (this.listeners == null) {
            return;
        }
        for (StdItemSetChangeListener l : this.listeners) {
            l.groupChanged(group);
        }
    }

    /**
     * firePDPChanged.
     *
     * @param pdp OnapPDP
     */
    public void firePDPChanged(OnapPDP pdp) {
        if (this.listeners == null) {
            return;
        }
        for (StdItemSetChangeListener l : this.listeners) {
            l.pdpChanged(pdp);
        }
    }
}