ListMessageRegistry.java

/*
 * Copyright 2013 serso aka se.solovyev
 *
 * 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.
 *
 * ---------------------------------------------------------------------
 * Contact details
 *
 * Email: se.solovyev@gmail.com
 * Site:  http://se.solovyev.org
 */

package org.solovyev.common.msg;

import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.List;

public class ListMessageRegistry implements MessageRegistry {

    @Nonnull
    private final List<Message> messages = new ArrayList<Message>();

    @Override
    public void addMessage(@Nonnull Message message) {
        if (!messages.contains(message)) {
            messages.add(message);
        }
    }

    @Nonnull
    @Override
    public Message getMessage() {
        return this.messages.remove(0);
    }

    @Override
    public boolean hasMessage() {
        return !this.messages.isEmpty();
    }
}