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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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 proguard.util;

/**
 * This {@link StringMatcher} tests whether strings end in a given extension, ignoring its case.
 *
 * @author Eric Lafortune
 */
public class ExtensionMatcher extends StringMatcher {
  private final String extension;

  /**
   * Creates a new StringMatcher.
   *
   * @param extension the extension against which strings will be matched.
   */
  public ExtensionMatcher(String extension) {
    this.extension = extension;
  }

  // Implementations for StringMatcher.

  @Override
  protected boolean matches(String string, int beginOffset, int endOffset) {
    return endsWithIgnoreCase(string, beginOffset, endOffset, extension);
  }

  /** Returns whether the given string ends with the given suffix, ignoring its case. */
  private static boolean endsWithIgnoreCase(
      String string, int beginOffset, int endOffset, String suffix) {
    int suffixLength = suffix.length();

    return string.regionMatches(true, endOffset - suffixLength, suffix, 0, suffixLength);
  }
}