001    package org.apache.maven.model.path;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one
005     * or more contributor license agreements.  See the NOTICE file
006     * distributed with this work for additional information
007     * regarding copyright ownership.  The ASF licenses this file
008     * to you under the Apache License, Version 2.0 (the
009     * "License"); you may not use this file except in compliance
010     * with the License.  You may obtain a copy of the License at
011     *
012     *  http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing,
015     * software distributed under the License is distributed on an
016     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017     * KIND, either express or implied.  See the License for the
018     * specific language governing permissions and limitations
019     * under the License.
020     */
021    
022    import org.codehaus.plexus.component.annotations.Component;
023    
024    /**
025     * Normalizes a URL.
026     * 
027     * @author Benjamin Bentmann
028     */
029    @Component( role = UrlNormalizer.class )
030    public class DefaultUrlNormalizer
031        implements UrlNormalizer
032    {
033    
034        public String normalize( String url )
035        {
036            String result = url;
037    
038            if ( result != null )
039            {
040                while ( true )
041                {
042                    int idx = result.indexOf( "/../" );
043                    if ( idx <= 0 )
044                    {
045                        break;
046                    }
047                    int parent = idx - 1;
048                    while ( parent >= 0 && result.charAt( parent ) == '/' )
049                    {
050                        parent--;
051                    }
052                    parent = result.lastIndexOf( '/', parent );
053                    if ( parent < 0 )
054                    {
055                        break;
056                    }
057                    result = result.substring( 0, parent ) + result.substring( idx + 3 );
058                }
059            }
060    
061            return result;
062        }
063    
064    }