package org.apache.maven.shared.filtering;

 /*

  * 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.regex.Pattern;

 import org.codehaus.plexus.util.StringUtils;

 /**

  * @author Olivier Lamy

  * @author Dennis Lundberg

  *

  */

 public final class FilteringUtils

 {

     private static final String WINDOWS_PATH_PATTERN = "^(.*)[a-zA-Z]:\\\\(.*)";

     private static final Pattern PATTERN = Pattern.compile( WINDOWS_PATH_PATTERN ) ;

     /**

      * 

      */

     private FilteringUtils()

     {

         // nothing just an util class

     }

     // TODO: Correct to handle relative windows paths. (http://jira.codehaus.org/browse/MSHARED-121)

     // How do we distinguish a relative windows path from some other value that happens to contain backslashes??

     public static String escapeWindowsPath( String val )

     {

         if ( !StringUtils.isEmpty( val ) && PATTERN.matcher( val ).matches() )

         {

             // Adapted from StringUtils.replace in plexus-utils to accommodate pre-escaped backslashes.

             StringBuffer buf = new StringBuffer( val.length() );

             int start = 0, end = 0;

             while ( ( end = val.indexOf( '\\', start ) ) != -1 )

             {

                 buf.append( val.substring( start, end ) ).append( "\\\\" );

                 start = end + 1;

                 if ( val.indexOf( '\\', end + 1 ) == end + 1 )

                 {

                     start++;

                 }

             }

             buf.append( val.substring( start ) );

             return buf.toString();

         }

         return val;

     }

 }