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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) 2002-2021 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 match both given {@link StringMatcher}
 * instances.
 *
 * @author Eric Lafortune
 */
public class AndMatcher extends StringMatcher {
  private final StringMatcher matcher1;
  private final StringMatcher matcher2;

  /** Creates a new AndMatcher with the two given string matchers. */
  public AndMatcher(StringMatcher matcher1, StringMatcher matcher2) {
    this.matcher1 = matcher1;
    this.matcher2 = matcher2;
  }

  // Implementations for StringMatcher.

  @Override
  public String prefix() {
    String prefix1 = this.matcher1.prefix();
    String prefix2 = this.matcher2.prefix();

    if (prefix1 == null || prefix2 == null) return null;

    if (prefix1.length() < prefix2.length()) {
      if (!prefix2.startsWith(prefix1))
        // can never match
        return null;
      return prefix1;
    } else if (!prefix1.startsWith(prefix2))
      // can never match
      return null;
    return prefix2;
  }

  @Override
  protected boolean matches(String string, int beginOffset, int endOffset) {
    return matcher1.matches(string, beginOffset, endOffset)
        && matcher2.matches(string, beginOffset, endOffset);
  }
}