proguard.evaluation.value.BasicRangeValueFactory 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) 2002-2020 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.evaluation.value;

/**
 * This ValueFactory provides methods to create and reuse IntegerValue instances that have known
 * ranges.
 *
 * This basic implementation only creates RangeIntegerValue instances if they start out with a
 * known range. Otherwise, it still creates ParticularIntegerValue instances or UnknownIntegerValue
 * instances, which by themselves never generalize to RangeIntegerValue instances.
 *
 * @author Eric Lafortune
 */
public class BasicRangeValueFactory extends ParticularValueFactory implements ValueFactory {
  // Shared copies of Value objects, to avoid creating a lot of objects.
  static final IntegerValue INTEGER_VALUE_BYTE =
      new RangeIntegerValue(Byte.MIN_VALUE, Byte.MAX_VALUE);
  static final IntegerValue INTEGER_VALUE_CHAR =
      new RangeIntegerValue(Character.MIN_VALUE, Character.MAX_VALUE);
  static final IntegerValue INTEGER_VALUE_SHORT =
      new RangeIntegerValue(Short.MIN_VALUE, Short.MAX_VALUE);

  /** Creates a new BasicRangeValueFactory. */
  public BasicRangeValueFactory() {
    super();
  }

  /**
   * Creates a new BasicRangeValueFactory that delegates to the given value factories for creating
   * reference values.
   */
  public BasicRangeValueFactory(
      ValueFactory arrayReferenceValueFactory, ValueFactory referenceValueFactory) {
    super(arrayReferenceValueFactory, referenceValueFactory);
  }

  // Implementations for ValueFactory.

  public IntegerValue createIntegerValue(int min, int max) {
    return min == max ? new ParticularIntegerValue(min) : new RangeIntegerValue(min, max);
  }
}