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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) 2002-2023 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;

import java.util.Objects;
import proguard.classfile.Clazz;

/**
 * This {@link ReferenceValue} represents a reference value that is identified by a unique ID.
 *
 * @author Eric Lafortune
 */
public class IdentifiedReferenceValue extends TypedReferenceValue {
  private final ValueFactory valuefactory;
  public final Object id;

  /** Creates a new reference value with the given ID. */
  public IdentifiedReferenceValue(
      String type,
      Clazz referencedClass,
      boolean mayBeExtension,
      boolean mayBeNull,
      ValueFactory valuefactory,
      Object id) {
    super(type, referencedClass, mayBeExtension, mayBeNull);

    this.valuefactory = valuefactory;
    this.id = id;
  }

  // Implementations of binary methods of ReferenceValue.

  public ReferenceValue generalize(ReferenceValue other) {
    return other.generalize(this);
  }

  public int equal(ReferenceValue other) {
    return other.equal(this);
  }

  //    // Implementations of binary ReferenceValue methods with
  //    // UnknownReferenceValue arguments.
  //
  //    public ReferenceValue generalize(UnknownReferenceValue other)
  //    {
  //        return other;
  //    }
  //
  //
  //    public int equal(UnknownReferenceValue other)
  //    {
  //        return MAYBE;
  //    }
  //
  //
  //    // Implementations of binary ReferenceValue methods with
  //    // TypedReferenceValue arguments.
  //
  //    public ReferenceValue generalize(TypedReferenceValue other)
  //    {
  //    }
  //
  //
  //    public int equal(TypedReferenceValue other)
  //    {
  //    }

  // Implementations of binary ReferenceValue methods with
  // IdentifiedReferenceValue arguments.

  public ReferenceValue generalize(IdentifiedReferenceValue other) {
    if (this.equals(other)) return this;

    if (Objects.equals(this.type, other.type)
        && Objects.equals(this.id, other.id)
        && this.referencedClass == other.referencedClass
        && this.valuefactory == other.valuefactory) {
      return new IdentifiedReferenceValue(
          type,
          referencedClass,
          mayBeExtension || other.mayBeExtension,
          mayBeNull || other.mayBeNull,
          valuefactory,
          id);
    }

    return generalize((TypedReferenceValue) other);
  }

  public int equal(IdentifiedReferenceValue other) {
    return this.equals(other) ? ALWAYS : this.equal((TypedReferenceValue) other);
  }

  //    // Implementations of binary ReferenceValue methods with
  //    // ArrayReferenceValue arguments.
  //
  //    public ReferenceValue generalize(ArrayReferenceValue other)
  //    {
  //        return generalize((TypedReferenceValue)other);
  //    }
  //
  //
  //    public int equal(ArrayReferenceValue other)
  //    {
  //        return equal((TypedReferenceValue)other);
  //    }
  //
  //
  //    // Implementations of binary ReferenceValue methods with
  //    // IdentifiedArrayReferenceValue arguments.
  //
  //    public ReferenceValue generalize(IdentifiedArrayReferenceValue other)
  //    {
  //        return generalize((ArrayReferenceValue)other);
  //    }
  //
  //
  //    public int equal(IdentifiedArrayReferenceValue other)
  //    {
  //        return equal((ArrayReferenceValue)other);
  //    }
  //
  //
  //    // Implementations of binary ReferenceValue methods with
  //    // DetailedArrayReferenceValue arguments.
  //
  //    public ReferenceValue generalize(DetailedArrayReferenceValue other)
  //    {
  //        return generalize((IdentifiedArrayReferenceValue)other);
  //    }
  //
  //
  //    public int equal(DetailedArrayReferenceValue other)
  //    {
  //        return equal((IdentifiedArrayReferenceValue)other);
  //    }
  //
  //
  //    // Implementations of binary ReferenceValue methods with
  //    // TracedReferenceValue arguments.
  //
  //    public ReferenceValue generalize(TracedReferenceValue other)
  //    {
  //        return other.generalize(this);
  //    }
  //
  //
  //    public int equal(TracedReferenceValue other)
  //    {
  //        return other.equal(this);
  //    }

  // Implementations for Value.

  public boolean isSpecific() {
    return true;
  }

  // Implementations for Object.

  public boolean equals(Object object) {
    if (this == object) {
      return true;
    }

    if (!super.equals(object)) {
      return false;
    }

    IdentifiedReferenceValue other = (IdentifiedReferenceValue) object;
    return this.valuefactory.equals(other.valuefactory) && this.id.equals(other.id);
  }

  public int hashCode() {
    return Objects.hash(super.hashCode(), valuefactory, id);
  }

  public String toString() {
    return super.toString() + '#' + id;
  }
}