/*
    * 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.clean;
  
  import java.io.File;
  import java.util.Arrays;
  
  import org.codehaus.plexus.util.DirectoryScanner;
  import org.codehaus.plexus.util.SelectorUtils;
  
  /**
   * Selects paths based on Ant-like glob patterns.
   *
   * @author Benjamin Bentmann
   */
  class GlobSelector implements Selector {
  
      private final String[] includes;
  
      private final String[] excludes;
  
      private final String str;
  
      GlobSelector(String[] includes, String[] excludes) {
          this(includes, excludes, false);
      }
  
      GlobSelector(String[] includes, String[] excludes, boolean useDefaultExcludes) {
          this.str = "includes = " + toString(includes) + ", excludes = " + toString(excludes);
          this.includes = normalizePatterns(includes);
          this.excludes = normalizePatterns(addDefaultExcludes(excludes, useDefaultExcludes));
      }
  
      private static String toString(String[] patterns) {
          return (patterns == null) ? "[]" : Arrays.asList(patterns).toString();
      }
  
      private static String[] addDefaultExcludes(String[] excludes, boolean useDefaultExcludes) {
          String[] defaults = DirectoryScanner.DEFAULTEXCLUDES;
          if (!useDefaultExcludes) {
              return excludes;
          } else if (excludes == null || excludes.length <= 0) {
              return defaults;
          } else {
              String[] patterns = new String[excludes.length + defaults.length];
              System.arraycopy(excludes, 0, patterns, 0, excludes.length);
              System.arraycopy(defaults, 0, patterns, excludes.length, defaults.length);
              return patterns;
          }
      }
  
      private static String[] normalizePatterns(String[] patterns) {
          String[] normalized;
  
          if (patterns != null) {
              normalized = new String[patterns.length];
              for (int i = patterns.length - 1; i >= 0; i--) {
                  normalized[i] = normalizePattern(patterns[i]);
              }
          } else {
              normalized = new String[0];
          }
  
          return normalized;
      }
  
      private static String normalizePattern(String pattern) {
          if (pattern == null) {
              return "";
          }
  
          String normalized = pattern.replace((File.separatorChar == '/') ? '\\' : '/', File.separatorChar);
  
          if (normalized.endsWith(File.separator)) {
              normalized += "**";
          }
  
          return normalized;
      }
  
      public boolean isSelected(String pathname) {
          return (includes.length <= 0 || isMatched(pathname, includes))
                  && (excludes.length <= 0 || !isMatched(pathname, excludes));
     }
 
     private static boolean isMatched(String pathname, String[] patterns) {
         for (String pattern : patterns) {
             if (SelectorUtils.matchPath(pattern, pathname)) {
                 return true;
             }
         }
         return false;
     }
 
     public boolean couldHoldSelected(String pathname) {
         for (String include : includes) {
             if (SelectorUtils.matchPatternStart(include, pathname)) {
                 return true;
             }
         }
         return includes.length <= 0;
     }
 
     public String toString() {
         return str;
     }
 }