proguard.evaluation.value.RangeValueFactory Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of proguard-core Show documentation

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 implementation creates RangeIntegerValue instances in all IntegerValue factory methods.
 * This way, the RangeIntegerValue instances can generalize further to other RangeIntegerValue
 * instances, even if they start out as known particular values.
 *
 * @author Eric Lafortune
 */
public class RangeValueFactory extends BasicRangeValueFactory 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);
  static final IntegerValue INTEGER_VALUE_INT =
      new RangeIntegerValue(Integer.MIN_VALUE, Integer.MAX_VALUE);

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

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

  // Implementations for ValueFactory.

  public IntegerValue createIntegerValue() {
    return INTEGER_VALUE_INT;
  }

  public IntegerValue createIntegerValue(int value) {
    return new RangeIntegerValue(value, value);
  }

  public IntegerValue createIntegerValue(int min, int max) {
    return new RangeIntegerValue(min, max);
  }
}