package org.apache.maven.model.transform;

/*
 * 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.List;

import org.apache.maven.model.transform.pull.NodeBufferingParser;
import org.codehaus.plexus.util.xml.pull.XmlPullParser;

/**
 * Remove relativePath element, has no value for consumer pom
 *
 * @author Robert Scholte
 * @author Guillaume Nodet
 * @since 4.0.0
 */
public class RelativePathXMLFilter extends NodeBufferingParser
{

    public RelativePathXMLFilter( XmlPullParser xmlPullParser )
    {
        super( xmlPullParser, "parent" );
    }

    protected void process( List<Event> buffer )
    {
        boolean skip = false;
        Event prev = null;
        for ( Event event : buffer )
        {
            if ( event.event == START_TAG && "relativePath".equals( event.name ) )
            {
                skip = true;
                if ( prev != null && prev.event == TEXT && prev.text.matches( "\\s+" ) )
                {
                    prev = null;
                }
                event = null;
            }
            else if ( event.event == END_TAG && "relativePath".equals( event.name ) )
            {
                skip = false;
                event = null;
            }
            else if ( skip )
            {
                event = null;
            }
            if ( prev != null )
            {
                pushEvent( prev );
            }
            prev = event;
        }
        pushEvent( prev );
    }

}