/*
 * Copyright 2016 Cisco Systems, Inc.
 *
 * 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.
 *
 */

package com.cisco.gerrit.plugins.slack.message;

import com.cisco.gerrit.plugins.slack.config.ProjectConfig;
import com.google.gerrit.server.events.ChangeEvent;

/**
 * A specific MessageGenerator implementation that can generate a message for
 * an unsupported ChangeEvent. The default behavior for this MessageGenerator
 * is to flag that it should not be published.
 *
 * @author Matthew Montgomery
 */
public class UnsupportedMessageGenerator extends MessageGenerator
{
    private ProjectConfig config;
    private ChangeEvent event;

    protected UnsupportedMessageGenerator(ChangeEvent event,
            ProjectConfig config)
    {
        if (event == null)
        {
            throw new NullPointerException("event cannot be null");
        }

        this.event = event;
        this.config = config;
    }

    @Override
    public boolean shouldPublish()
    {
        return false;
    }

    @Override
    public String generate()
    {
        StringBuilder message;
        message = new StringBuilder();

        message.append("Unsupported change event: ");
        message.append(this.event.toString());

        return message.toString();
    }
}