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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;

import proguard.classfile.*;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.*;
import proguard.evaluation.value.*;

/**
 * This class creates {@link Value} instances that correspond to specified constant pool entries.
 *
 * @author Eric Lafortune
 */
public class ConstantValueFactory implements ConstantVisitor {
  protected final ValueFactory valueFactory;

  // Field acting as a parameter for the ConstantVisitor methods.
  protected Value value;

  public ConstantValueFactory(ValueFactory valueFactory) {
    this.valueFactory = valueFactory;
  }

  /** Returns the Value of the constant pool element at the given index. */
  public Value constantValue(Clazz clazz, int constantIndex) {
    // Visit the constant pool entry to get its return value.
    clazz.constantPoolEntryAccept(constantIndex, this);

    return value;
  }

  // Implementations for ConstantVisitor.

  public void visitIntegerConstant(Clazz clazz, IntegerConstant integerConstant) {
    value = valueFactory.createIntegerValue(integerConstant.getValue());
  }

  public void visitLongConstant(Clazz clazz, LongConstant longConstant) {
    value = valueFactory.createLongValue(longConstant.getValue());
  }

  public void visitFloatConstant(Clazz clazz, FloatConstant floatConstant) {
    value = valueFactory.createFloatValue(floatConstant.getValue());
  }

  public void visitDoubleConstant(Clazz clazz, DoubleConstant doubleConstant) {
    value = valueFactory.createDoubleValue(doubleConstant.getValue());
  }

  public void visitPrimitiveArrayConstant(
      Clazz clazz, PrimitiveArrayConstant primitiveArrayConstant) {
    value =
        valueFactory.createArrayReferenceValue(
            "" + primitiveArrayConstant.getPrimitiveType(),
            null,
            valueFactory.createIntegerValue(primitiveArrayConstant.getLength()));
  }

  public void visitStringConstant(Clazz clazz, StringConstant stringConstant) {
    value =
        valueFactory.createReferenceValue(
            ClassConstants.TYPE_JAVA_LANG_STRING,
            stringConstant.javaLangStringClass,
            false,
            false,
            stringConstant.getString(clazz));
  }

  public void visitDynamicConstant(Clazz clazz, DynamicConstant dynamicConstant) {
    String type = ClassUtil.internalMethodReturnType(dynamicConstant.getType(clazz));

    // Is the method returning a class type?
    Clazz[] referencedClasses = dynamicConstant.referencedClasses;
    Clazz referencedClass =
        referencedClasses != null
                && referencedClasses.length > 0
                && ClassUtil.isInternalClassType(type)
            ? referencedClasses[referencedClasses.length - 1]
            : null;

    value = valueFactory.createValue(type, referencedClass, true, true);
  }

  public void visitMethodHandleConstant(Clazz clazz, MethodHandleConstant methodHandleConstant) {
    value =
        valueFactory.createReferenceValue(
            ClassConstants.TYPE_JAVA_LANG_INVOKE_METHOD_HANDLE,
            methodHandleConstant.javaLangInvokeMethodHandleClass,
            false,
            false);
  }

  public void visitClassConstant(Clazz clazz, ClassConstant classConstant) {
    value =
        valueFactory.createReferenceValue(
            ClassUtil.internalTypeFromClassType(classConstant.getName(clazz)),
            classConstant.referencedClass,
            false,
            false);
  }

  public void visitMethodTypeConstant(Clazz clazz, MethodTypeConstant methodTypeConstant) {
    value =
        valueFactory.createReferenceValue(
            ClassConstants.TYPE_JAVA_LANG_INVOKE_METHOD_TYPE,
            methodTypeConstant.javaLangInvokeMethodTypeClass,
            false,
            false);
  }
}