proguard.util.ClassPoolFeatureNameFunction Maven / Gradle / Ivy

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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) 2002-2022 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;

import java.util.Set;
import proguard.classfile.ClassPool;
import proguard.classfile.Clazz;

/**
 * This StringFunction transforms class names to feature names, based on a given class pool.
 *
 * @author Eric Lafortune
 */
public class ClassPoolFeatureNameFunction implements StringFunction {
  private final ClassPool classPool;
  private final String defaultFeatureName;

  /** Creates a new ClassPoolNameFunction based on the given class pool. */
  public ClassPoolFeatureNameFunction(ClassPool classPool) {
    this(classPool, null);
  }

  /**
   * Creates a new ClassPoolNameFunction based on the given class pool, with a default string for
   * classes that are not in the class pool.
   */
  public ClassPoolFeatureNameFunction(ClassPool classPool, String defaultFeatureName) {
    this.classPool = classPool;
    this.defaultFeatureName = defaultFeatureName;
  }

  // Implementations for StringFunction.

  public String transform(String string) {
    Clazz clazz = classPool.getClass(string);
    if (clazz == null) {
      return defaultFeatureName;
    }

    Set features = clazz.getExtraFeatureNames();
    // If there is only one feature then return that feature.
    if (features.size() == 1) {
      return features.iterator().next();
    }

    // TODO(T6954): If there are no features or more than one, conservatively return the base
    // feature.
    return defaultFeatureName;
  }
}