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/* FJBG -- Fast Java Bytecode Generator
* Copyright 2002-2011 LAMP/EPFL
* @author Michel Schinz
*/
package ch.epfl.lamp.fjbg;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
/**
* ConstantValue attribute representing the value of a constant field.
*
* There can be no more than one ConstantValue attribute in the attributes
* table of a given field_info structure.. See section 4.8.2 of the JVM
* specification.
*
* @author Stephane Micheloud
* @version 1.0
*/
public class JConstantValueAttribute extends JAttribute {
/** Constant pool of the current classfile. */
private JConstantPool pool;
protected int constantValueIndex;
public JConstantValueAttribute(FJBGContext context,
JClass clazz,
JField field) {
super(context, clazz);
this.pool = clazz.pool;
assert field.getOwner() == clazz;
}
public JConstantValueAttribute(FJBGContext context,
JClass clazz,
Object owner, // JField
String name,
int size,
DataInputStream stream)
throws IOException {
super(context, clazz, name);
this.pool = clazz.pool;
this.constantValueIndex = stream.readShort();
assert name.equals(getName());
}
public String getName() { return "ConstantValue"; }
// Follows javap output format for ConstantValue attribute.
/*@Override*/ public String toString() {
StringBuffer buf = new StringBuffer(" Constant value: ");
buf.append(pool.lookupEntry(constantValueIndex));
return buf.toString();
}
protected int getSize() {
return 2; // Short.SIZE
}
protected void writeContentsTo(DataOutputStream stream) throws IOException {
stream.writeShort(constantValueIndex);
}
}
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