/*
* Copyright 2000-2004 The Apache Software Foundation
*
* 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 org.apache.bcel.generic;
import org.apache.bcel.classfile.ConstantCP;
import org.apache.bcel.classfile.ConstantNameAndType;
import org.apache.bcel.classfile.ConstantPool;
import org.apache.bcel.classfile.ConstantUtf8;
/**
* Super class for InvokeInstruction and FieldInstruction, since they have
* some methods in common!
*
* @version $Id: FieldOrMethod.java 386056 2006-03-15 11:31:56Z tcurdt $
* @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
*/
public abstract class FieldOrMethod extends CPInstruction implements LoadClass {
/**
* Empty constructor needed for the Class.newInstance() statement in
* Instruction.readInstruction(). Not to be used otherwise.
*/
FieldOrMethod() {
}
/**
* @param index to constant pool
*/
protected FieldOrMethod(short opcode, int index) {
super(opcode, index);
}
/** @return signature of referenced method/field.
*/
public String getSignature( ConstantPoolGen cpg ) {
ConstantPool cp = cpg.getConstantPool();
ConstantCP cmr = (ConstantCP) cp.getConstant(index);
ConstantNameAndType cnat = (ConstantNameAndType) cp.getConstant(cmr.getNameAndTypeIndex());
return ((ConstantUtf8) cp.getConstant(cnat.getSignatureIndex())).getBytes();
}
/** @return name of referenced method/field.
*/
public String getName( ConstantPoolGen cpg ) {
ConstantPool cp = cpg.getConstantPool();
ConstantCP cmr = (ConstantCP) cp.getConstant(index);
ConstantNameAndType cnat = (ConstantNameAndType) cp.getConstant(cmr.getNameAndTypeIndex());
return ((ConstantUtf8) cp.getConstant(cnat.getNameIndex())).getBytes();
}
/** @return name of the referenced class/interface
* @deprecated If the instruction references an array class,
* this method will return "java.lang.Object".
* For code generated by Java 1.5, this answer is
* sometimes wrong (e.g., if the "clone()" method is
* called on an array). A better idea is to use
* the getReferenceType() method, which correctly distinguishes
* between class types and array types.
*/
public String getClassName( ConstantPoolGen cpg ) {
ConstantPool cp = cpg.getConstantPool();
ConstantCP cmr = (ConstantCP) cp.getConstant(index);
String className = cp.getConstantString(cmr.getClassIndex(),
org.apache.bcel.Constants.CONSTANT_Class);
if (className.startsWith("[")) {
// Turn array classes into java.lang.Object.
return "java.lang.Object";
}
return className.replace('/', '.');
}
/** @return type of the referenced class/interface
* @deprecated If the instruction references an array class,
* the ObjectType returned will be invalid. Use
* getReferenceType() instead.
*/
public ObjectType getClassType( ConstantPoolGen cpg ) {
return new ObjectType(getClassName(cpg));
}
/**
* Return the reference type representing the class, interface,
* or array class referenced by the instruction.
* @param cpg the ConstantPoolGen used to create the instruction
* @return an ObjectType (if the referenced class type is a class
* or interface), or an ArrayType (if the referenced class
* type is an array class)
*/
public ReferenceType getReferenceType( ConstantPoolGen cpg ) {
ConstantPool cp = cpg.getConstantPool();
ConstantCP cmr = (ConstantCP) cp.getConstant(index);
String className = cp.getConstantString(cmr.getClassIndex(),
org.apache.bcel.Constants.CONSTANT_Class);
if (className.startsWith("[")) {
return (ArrayType) Type.getType(className);
} else {
className = className.replace('/', '.');
return new ObjectType(className);
}
}
/** @return type of the referenced class/interface
*/
public ObjectType getLoadClassType( ConstantPoolGen cpg ) {
return getClassType(cpg);
}
}