content: /*
   *  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
   *
   *      https://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.tools.ant.types.selectors;
  
  import java.io.File;
  import java.util.StringTokenizer;
  
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.types.Parameter;
  
  /**
   * Selector that filters files based on the how deep in the directory
   * tree they are.
   *
   * @since 1.5
   */
  public class DepthSelector extends BaseExtendSelector {
  
      /** Used for parameterized custom selector */
      public static final String MIN_KEY = "min";
      /** Used for parameterized custom selector */
      public static final String MAX_KEY = "max";
  
      // CheckStyle:VisibilityModifier OFF - bc
  
      /** min attribute */
      public int min = -1;
      /** max attribute */
      public int max = -1;
  
      // CheckStyle:VisibilityModifier ON
  
      /**
       * @return a string describing this object
       */
      public String toString() {
          return "{depthselector min: " + min + " max: " + max + "}";
      }
  
      /**
       * The minimum depth below the basedir before a file is selected.
       *
       * @param min minimum directory levels below basedir to go
       */
      public void setMin(int min) {
          this.min = min;
      }
  
      /**
       * The minimum depth below the basedir before a file is selected.
       *
       * @param max maximum directory levels below basedir to go
       */
      public void setMax(int max) {
          this.max = max;
      }
  
      /**
       * When using this as a custom selector, this method will be called.
       * It translates each parameter into the appropriate setXXX() call.
       *
       * @param parameters the complete set of parameters for this selector
       */
      public void setParameters(Parameter... parameters) {
          super.setParameters(parameters);
          if (parameters != null) {
              for (Parameter parameter : parameters) {
                  String paramname = parameter.getName();
                  if (MIN_KEY.equalsIgnoreCase(paramname)) {
                      try {
                          setMin(Integer.parseInt(parameter.getValue()));
                      } catch (NumberFormatException nfe1) {
                          setError("Invalid minimum value "
                                  + parameter.getValue());
                      }
                  } else if (MAX_KEY.equalsIgnoreCase(paramname)) {
                      try {
                          setMax(Integer.parseInt(parameter.getValue()));
                      } catch (NumberFormatException nfe1) {
                          setError("Invalid maximum value "
                                  + parameter.getValue());
                      }
                  } else {
                      setError("Invalid parameter " + paramname);
                  }
              }
          }
      }
  
      /**
       * Checks to make sure all settings are kosher. In this case, it
       * means that the max depth is not lower than the min depth.
       */
      public void verifySettings() {
          if (min < 0 && max < 0) {
              setError("You must set at least one of the min or the max levels.");
          }
          if (max < min && max > -1) {
              setError("The maximum depth is lower than the minimum.");
          }
      }
  
      /**
       * The heart of the matter. This is where the selector gets to decide
       * on the inclusion of a file in a particular fileset. Most of the work
       * for this selector is offloaded into SelectorUtils, a static class
       * that provides the same services for both FilenameSelector and
       * DirectoryScanner.
       *
       * @param basedir the base directory the scan is being done from
       * @param filename is the name of the file to check
       * @param file is a java.io.File object the selector can use
       * @return whether the file should be selected or not
       */
      public boolean isSelected(File basedir, String filename, File file) {
  
          // throw BuildException on error
          validate();
  
          int depth = -1;
          // If you felt daring, you could cache the basedir absolute path
          String absBase = basedir.getAbsolutePath();
          String absFile = file.getAbsolutePath();
          StringTokenizer tokBase = new StringTokenizer(absBase, File.separator);
          StringTokenizer tokFile = new StringTokenizer(absFile, File.separator);
          while (tokFile.hasMoreTokens()) {
              String filetoken = tokFile.nextToken();
              if (tokBase.hasMoreTokens()) {
                  String basetoken = tokBase.nextToken();
                  // Sanity check. Ditch it if you want faster performance
                  if (!basetoken.equals(filetoken)) {
                      throw new BuildException(
                          "File %s does not appear within %s directory", filename,
                          absBase);
                  }
              } else {
                  depth += 1;
                  if (max > -1 && depth > max) {
                      return false;
                  }
              }
          }
          if (tokBase.hasMoreTokens()) {
              throw new BuildException("File %s is outside of %s directory tree",
                  filename, absBase);
          }
          return min <= -1 || depth >= min;
      }
  }
  