code: /*
   * 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.commons.io.filefilter;
  
  import java.io.File;
  import java.io.Serializable;
  import java.util.List;
  
  import org.apache.commons.io.FilenameUtils;
  import org.apache.commons.io.IOCase;
  
  /**
   * Filters files using the supplied wildcards.
   * <p>
   * This filter selects files and directories based on one or more wildcards.
   * Testing is case-sensitive by default, but this can be configured.
   * <p>
   * The wildcard matcher uses the characters '?' and '*' to represent a
   * single or multiple wildcard characters.
   * This is the same as often found on Dos/Unix command lines.
   * The extension check is case-sensitive by .
   * See {@link FilenameUtils#wildcardMatchOnSystem} for more information.
   * <p>
   * For example:
   * <pre>
   * File dir = new File(".");
   * FileFilter fileFilter = new WildcardFileFilter("*test*.java~*~");
   * File[] files = dir.listFiles(fileFilter);
   * for (int i = 0; i < files.length; i++) {
   *   System.out.println(files[i]);
   * }
   * </pre>
   *
   * @author Jason Anderson
   * @version $Revision: 1004077 $ $Date: 2010-10-04 01:58:42 +0100 (Mon, 04 Oct 2010) $
   * @since Commons IO 1.3
   */
  public class WildcardFileFilter extends AbstractFileFilter implements Serializable {
  
      /** The wildcards that will be used to match filenames. */
      private final String[] wildcards;
      /** Whether the comparison is case sensitive. */
      private final IOCase caseSensitivity;
  
      /**
       * Construct a new case-sensitive wildcard filter for a single wildcard.
       *
       * @param wildcard  the wildcard to match
       * @throws IllegalArgumentException if the pattern is null
       */
      public WildcardFileFilter(String wildcard) {
          this(wildcard, null);
      }
  
      /**
       * Construct a new wildcard filter for a single wildcard specifying case-sensitivity.
       *
       * @param wildcard  the wildcard to match, not null
       * @param caseSensitivity  how to handle case sensitivity, null means case-sensitive
       * @throws IllegalArgumentException if the pattern is null
       */
      public WildcardFileFilter(String wildcard, IOCase caseSensitivity) {
          if (wildcard == null) {
              throw new IllegalArgumentException("The wildcard must not be null");
          }
          this.wildcards = new String[] { wildcard };
          this.caseSensitivity = (caseSensitivity == null ? IOCase.SENSITIVE : caseSensitivity);
      }
  
      /**
       * Construct a new case-sensitive wildcard filter for an array of wildcards.
       * <p>
       * The array is not cloned, so could be changed after constructing the
       * instance. This would be inadvisable however.
       *
       * @param wildcards  the array of wildcards to match
       * @throws IllegalArgumentException if the pattern array is null
       */
      public WildcardFileFilter(String[] wildcards) {
          this(wildcards, null);
      }
  
      /**
       * Construct a new wildcard filter for an array of wildcards specifying case-sensitivity.
       * <p>
       * The array is not cloned, so could be changed after constructing the
       * instance. This would be inadvisable however.
       *
       * @param wildcards  the array of wildcards to match, not null
       * @param caseSensitivity  how to handle case sensitivity, null means case-sensitive
       * @throws IllegalArgumentException if the pattern array is null
       */
      public WildcardFileFilter(String[] wildcards, IOCase caseSensitivity) {
          if (wildcards == null) {
              throw new IllegalArgumentException("The wildcard array must not be null");
          }
          this.wildcards = new String[wildcards.length];
          System.arraycopy(wildcards, 0, this.wildcards, 0, wildcards.length);
          this.caseSensitivity = (caseSensitivity == null ? IOCase.SENSITIVE : caseSensitivity);
      }
  
      /**
       * Construct a new case-sensitive wildcard filter for a list of wildcards.
       *
       * @param wildcards  the list of wildcards to match, not null
       * @throws IllegalArgumentException if the pattern list is null
       * @throws ClassCastException if the list does not contain Strings
       */
      public WildcardFileFilter(List<String> wildcards) {
          this(wildcards, null);
      }
  
      /**
       * Construct a new wildcard filter for a list of wildcards specifying case-sensitivity.
       *
       * @param wildcards  the list of wildcards to match, not null
       * @param caseSensitivity  how to handle case sensitivity, null means case-sensitive
       * @throws IllegalArgumentException if the pattern list is null
       * @throws ClassCastException if the list does not contain Strings
       */
      public WildcardFileFilter(List<String> wildcards, IOCase caseSensitivity) {
          if (wildcards == null) {
              throw new IllegalArgumentException("The wildcard list must not be null");
          }
          this.wildcards = wildcards.toArray(new String[wildcards.size()]);
          this.caseSensitivity = (caseSensitivity == null ? IOCase.SENSITIVE : caseSensitivity);
      }
  
      //-----------------------------------------------------------------------
      /**
       * Checks to see if the filename matches one of the wildcards.
       *
       * @param dir  the file directory
       * @param name  the filename
       * @return true if the filename matches one of the wildcards
       */
      @Override
      public boolean accept(File dir, String name) {
          for (String wildcard : wildcards) {
              if (FilenameUtils.wildcardMatch(name, wildcard, caseSensitivity)) {
                  return true;
              }
          }
          return false;
      }
  
      /**
       * Checks to see if the filename matches one of the wildcards.
       *
       * @param file  the file to check
       * @return true if the filename matches one of the wildcards
       */
      @Override
      public boolean accept(File file) {
          String name = file.getName();
          for (String wildcard : wildcards) {
              if (FilenameUtils.wildcardMatch(name, wildcard, caseSensitivity)) {
                  return true;
              }
          }
          return false;
      }
  
      /**
       * Provide a String representaion of this file filter.
       *
       * @return a String representaion
       */
      @Override
      public String toString() {
          StringBuilder buffer = new StringBuilder();
          buffer.append(super.toString());
          buffer.append("(");
          if (wildcards != null) {
              for (int i = 0; i < wildcards.length; i++) {
                  if (i > 0) {
                      buffer.append(",");
                  }
                  buffer.append(wildcards[i]);
              }
          }
          buffer.append(")");
          return buffer.toString();
      }
  
  }
  