001package 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
022import org.codehaus.plexus.component.annotations.Component;
023
024/**
025 * Normalizes a URL.
026 *
027 * @author Benjamin Bentmann
028 */
029@Component( role = UrlNormalizer.class )
030public class DefaultUrlNormalizer
031    implements UrlNormalizer
032{
033
034    @Override
035    public String normalize( String url )
036    {
037        String result = url;
038
039        if ( result != null )
040        {
041            while ( true )
042            {
043                int idx = result.indexOf( "/../" );
044                if ( idx <= 0 )
045                {
046                    break;
047                }
048                int parent = idx - 1;
049                while ( parent >= 0 && result.charAt( parent ) == '/' )
050                {
051                    parent--;
052                }
053                parent = result.lastIndexOf( '/', parent );
054                if ( parent < 0 )
055                {
056                    break;
057                }
058                result = result.substring( 0, parent ) + result.substring( idx + 3 );
059            }
060        }
061
062        return result;
063    }
064
065}