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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;

import proguard.classfile.*;

/**
 * {@link ReferenceValue} that is unknown.
 *
 * @author Eric Lafortune
 */
public class UnknownReferenceValue extends ReferenceValue {
  // Implementations of unary methods of ReferenceValue.

  public String getType() {
    return ClassConstants.NAME_JAVA_LANG_OBJECT;
  }

  public Clazz getReferencedClass() {
    return null;
  }

  public boolean mayBeExtension() {
    return true;
  }

  public int isNull() {
    return MAYBE;
  }

  public int instanceOf(String otherType, Clazz otherReferencedClass) {
    return MAYBE;
  }

  public ReferenceValue cast(
      String type, Clazz referencedClass, ValueFactory valueFactory, boolean alwaysCast) {
    return valueFactory.createReferenceValue(type, referencedClass, true, true);
  }

  // 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)
  //    {
  //        return generalize((TypedReferenceValue)other);
  //    }
  //
  //
  //    public int equal(IdentifiedReferenceValue other)
  //    {
  //        return 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 isParticular() {
    return false;
  }

  public final String internalType() {
    return ClassConstants.TYPE_JAVA_LANG_OBJECT;
  }

  // Implementations for Object.

  public String toString() {
    return "a";
  }
}