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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.Const;
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 $Id$
*/
public abstract class FieldOrMethod extends CPInstruction implements LoadClass {
/**
* Empty constructor needed for Instruction.readInstruction.
* Not to be used otherwise.
*/
FieldOrMethod() {
}
/**
* @param index to constant pool
*/
protected FieldOrMethod(final short opcode, final int index) {
super(opcode, index);
}
/** @return signature of referenced method/field.
*/
public String getSignature( final ConstantPoolGen cpg ) {
final ConstantPool cp = cpg.getConstantPool();
final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
final ConstantNameAndType cnat = (ConstantNameAndType) cp.getConstant(cmr.getNameAndTypeIndex());
return ((ConstantUtf8) cp.getConstant(cnat.getSignatureIndex())).getBytes();
}
/** @return name of referenced method/field.
*/
public String getName( final ConstantPoolGen cpg ) {
final ConstantPool cp = cpg.getConstantPool();
final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
final 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 {@link #getReferenceType(ConstantPoolGen)} method, which correctly distinguishes
* between class types and array types.
*
*/
@Deprecated
public String getClassName( final ConstantPoolGen cpg ) {
final ConstantPool cp = cpg.getConstantPool();
final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
final String className = cp.getConstantString(cmr.getClassIndex(), Const.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.
*/
@Deprecated
public ObjectType getClassType( final ConstantPoolGen cpg ) {
return ObjectType.getInstance(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( final ConstantPoolGen cpg ) {
final ConstantPool cp = cpg.getConstantPool();
final ConstantCP cmr = (ConstantCP) cp.getConstant(super.getIndex());
String className = cp.getConstantString(cmr.getClassIndex(), Const.CONSTANT_Class);
if (className.startsWith("[")) {
return (ArrayType) Type.getType(className);
}
className = className.replace('/', '.');
return ObjectType.getInstance(className);
}
/**
* Get the ObjectType of the method return or field.
*
* @return type of the referenced class/interface
* @throws ClassGenException when the field is (or method returns) an array,
*/
@Override
public ObjectType getLoadClassType( final ConstantPoolGen cpg ) {
final ReferenceType rt = getReferenceType(cpg);
if(rt instanceof ObjectType) {
return (ObjectType)rt;
}
throw new ClassGenException(rt.getSignature() + " does not represent an ObjectType");
}
}
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