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 /*
  * Copyright (C) 2006 The Guava Authors
  *
  * Licensed 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 com.google.common.io;
File name filter that only accepts files matching a regular expression. This class is thread-safe and immutable.

Author(s):
Apple Chow
Since:
1.0
public final class PatternFilenameFilter implements FilenameFilter {
  private final Pattern pattern;

  
Constructs a pattern file name filter object.

Parameters:
patternStr the pattern string on which to filter file names
Throws:
java.util.regex.PatternSyntaxException if pattern compilation fails (runtime)
  public PatternFilenameFilter(String patternStr) {
    this(Pattern.compile(patternStr));
  }

  
Constructs a pattern file name filter object.

Parameters:
pattern the pattern on which to filter file names
  public PatternFilenameFilter(Pattern pattern) {
    this. = Preconditions.checkNotNull(pattern);
  }
  @Override public boolean accept(@Nullable File dirString fileName) {
    return .matcher(fileName).matches();
  }
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