/*
    * 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.
   */
  package org.apache.maven.plugins.assembly.archive.archiver;
  
  import java.io.File;
  
  import org.codehaus.plexus.archiver.FileSet;
  import org.codehaus.plexus.components.io.filemappers.FileMapper;
  import org.codehaus.plexus.components.io.fileselectors.FileSelector;
  import org.codehaus.plexus.components.io.functions.InputStreamTransformer;
  
  /**
   *
   */
  class PrefixedFileSet implements FileSet {
      private static final FileMapper[] EMPTY_FILE_MAPPERS_ARRAY = new FileMapper[0];
  
      private final String rootPrefix;
  
      private final FileSet fileSet;
  
      private final FileSelector[] selectors;
  
      /**
       * @param fileSet    The file set.
       * @param rootPrefix The root prefix
       * @param selectors  The file selectors.
       */
      PrefixedFileSet(final FileSet fileSet, final String rootPrefix, final FileSelector[] selectors) {
          this.fileSet = fileSet;
          this.selectors = selectors;
  
          if (rootPrefix.length() > 0 && !rootPrefix.endsWith("/")) {
              this.rootPrefix = rootPrefix + "/";
          } else {
              this.rootPrefix = rootPrefix;
          }
      }
  
      /**
       * {@inheritDoc}
       */
      static FileSelector[] combineSelectors(FileSelector[] first, FileSelector[] second) {
          if ((first != null) && (second != null)) {
              final FileSelector[] temp = new FileSelector[first.length + second.length];
  
              System.arraycopy(first, 0, temp, 0, first.length);
              System.arraycopy(second, 0, temp, first.length, second.length);
  
              first = temp;
          } else if ((first == null) && (second != null)) {
              first = second;
          }
  
          return first;
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String[] getExcludes() {
          return fileSet.getExcludes();
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public FileSelector[] getFileSelectors() {
          FileSelector[] sel = fileSet.getFileSelectors();
          return combineSelectors(sel, selectors);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String[] getIncludes() {
          return fileSet.getIncludes();
      }
  
      /**
      * {@inheritDoc}
      */
     @Override
     public String getPrefix() {
         String prefix = fileSet.getPrefix();
         if (prefix == null) {
             return rootPrefix;
         }
 
         if (prefix.startsWith("/")) {
             if (prefix.length() > 1) {
                 prefix = prefix.substring(1);
             } else {
                 prefix = "";
             }
         }
 
         return rootPrefix + prefix;
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isCaseSensitive() {
         return fileSet.isCaseSensitive();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isIncludingEmptyDirectories() {
         return fileSet.isIncludingEmptyDirectories();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public boolean isUsingDefaultExcludes() {
         return fileSet.isUsingDefaultExcludes();
     }
 
     /**
      * {@inheritDoc}
      */
     @Override
     public File getDirectory() {
         return fileSet.getDirectory();
     }
 
     @Override
     public InputStreamTransformer getStreamTransformer() {
         return fileSet.getStreamTransformer();
     }
 
     @Override
     public FileMapper[] getFileMappers() {
         return EMPTY_FILE_MAPPERS_ARRAY;
     }
 }