package org.apache.maven.plugin;

/*
 * 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.
 */

import java.util.Iterator;
import java.util.List;

import org.apache.maven.plugin.descriptor.MojoDescriptor;
import org.apache.maven.plugin.descriptor.PluginDescriptor;

public class MojoNotFoundException
    extends Exception
{
    private String goal;

    private PluginDescriptor pluginDescriptor;

    public MojoNotFoundException( String goal, PluginDescriptor pluginDescriptor )
    {
        super( toMessage( goal, pluginDescriptor ) );

        this.goal = goal;
        this.pluginDescriptor = pluginDescriptor;
    }

    public String getGoal()
    {
        return goal;
    }

    public PluginDescriptor getPluginDescriptor()
    {
        return pluginDescriptor;
    }

    private static String toMessage( String goal, PluginDescriptor pluginDescriptor )
    {
        StringBuilder buffer = new StringBuilder( 256 );

        buffer.append( "Could not find goal '" ).append( goal ).append( "'" );

        if ( pluginDescriptor != null )
        {
            buffer.append( " in plugin " ).append( pluginDescriptor.getId() );

            buffer.append( " among available goals " );
            List<MojoDescriptor> mojos = pluginDescriptor.getMojos();
            if ( mojos != null )
            {
                for ( Iterator<MojoDescriptor> it = mojos.iterator(); it.hasNext(); )
                {
                    MojoDescriptor mojo = it.next();
                    if ( mojo != null )
                    {
                        buffer.append( mojo.getGoal() );
                    }
                    if ( it.hasNext() )
                    {
                        buffer.append( ", " );
                    }
                }
            }
        }

        return buffer.toString();
    }

}
