com.github.fritaly.dualcommander.event.ChangeEventSupport.java Source code

Introduction

Here is the source code for com.github.fritaly.dualcommander.event.ChangeEventSupport.java

Source

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.github.fritaly.dualcommander.event;

import java.util.ArrayList;
import java.util.List;

import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.apache.commons.lang.Validate;

public final class ChangeEventSupport implements ChangeEventSource {

    private final List<ChangeListener> listeners = new ArrayList<>();

    public ChangeEventSupport() {
    }

    @Override
    public void addChangeListener(ChangeListener listener) {
        Validate.notNull(listener, "The given listener is null");

        this.listeners.add(listener);
    }

    @Override
    public void removeChangeListener(ChangeListener listener) {
        Validate.notNull(listener, "The given listener is null");

        this.listeners.remove(listener);
    }

    public void fireEvent(ChangeEvent event) {
        Validate.notNull(event, "The given event is null");

        for (ChangeListener listener : listeners) {
            listener.stateChanged(event);
        }
    }
}