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    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}