~repos /gdx-studio

/*
 * 03/21/2010
 *
 * Copyright (C) 2010 Robert Futrell
 * robert_futrell at users.sourceforge.net
 * http://fifesoft.com/rsyntaxtextarea
 *
 * This library is distributed under a modified BSD license.  See the included
 * RSTALanguageSupport.License.txt file for details.
 */
package org.fife.rsta.ac.java.classreader.attributes;

import org.fife.rsta.ac.java.classreader.*;
import org.fife.rsta.ac.java.classreader.constantpool.*;


/**
 * The "<code>ConstantValue</code>" attribute, as defined by 4.7.2 of the
 * JVM specification.
 *
 * @author Robert Futrell
 * @version 1.0
 */
public class ConstantValue extends AttributeInfo {

  /**
   * An index into the constant pool that gives the constant value
   * represented by this attribute.
   */
  private int constantValueIndex; // u2


  /**
   * CConstructor.
   *
   * @param cf The class file.
   * @param constantValueIndex The index into the constant pool that gives
   *        the constant value represented by this attribute.
   */
  public ConstantValue(ClassFile cf, int constantValueIndex) {
    super(cf);
    this.constantValueIndex = constantValueIndex;
  }


  /**
   * Returns the index into the constant pool that gives the constant value
   * represented by this attribute.
   *
   * @return The index.
   */
  public int getConstantValueIndex() {
    return constantValueIndex;
  }


  /**
   * Returns the constant's value, as a string.
   *
   * @return The constant's value, as a string.
   */
  public String getConstantValueAsString() {

    ClassFile cf = getClassFile();
    ConstantPoolInfo cpi = cf.getConstantPoolInfo(getConstantValueIndex());

    if (cpi instanceof ConstantDoubleInfo) {
      ConstantDoubleInfo cdi = (ConstantDoubleInfo)cpi;
      double value = cdi.getDoubleValue();
      return Double.toString(value);
    }
    else if (cpi instanceof ConstantFloatInfo) {
      ConstantFloatInfo cfi = (ConstantFloatInfo)cpi;
      float value = cfi.getFloatValue();
      return Float.toString(value);
    }
    else if (cpi instanceof ConstantIntegerInfo) {
      ConstantIntegerInfo cii = (ConstantIntegerInfo)cpi;
      int value = cii.getIntValue();
      return Integer.toString(value);
    }
    else if (cpi instanceof ConstantLongInfo) {
      ConstantLongInfo cli = (ConstantLongInfo)cpi;
      long value = cli.getLongValue();
      return Long.toString(value);
    }
    else if (cpi instanceof ConstantStringInfo) {
      ConstantStringInfo csi = (ConstantStringInfo)cpi;
      return csi.getStringValue();
    }
    else {
      return "INVALID_CONSTANT_TYPE_" + cpi.toString();
    }

  }


}