private static CtMethod delegator0(CtMethod delegate, CtClass declaring)
throws CannotCompileException, NotFoundException {
MethodInfo deleInfo = delegate.getMethodInfo2();
String methodName = deleInfo.getName();
String desc = deleInfo.getDescriptor();
ConstPool cp = declaring.getClassFile2().getConstPool();
MethodInfo minfo = new MethodInfo(cp, methodName, desc);
minfo.setAccessFlags(deleInfo.getAccessFlags());
ExceptionsAttribute eattr = deleInfo.getExceptionsAttribute();
if (eattr != null) minfo.setExceptionsAttribute((ExceptionsAttribute) eattr.copy(cp, null));
Bytecode code = new Bytecode(cp, 0, 0);
boolean isStatic = Modifier.isStatic(delegate.getModifiers());
CtClass deleClass = delegate.getDeclaringClass();
CtClass[] params = delegate.getParameterTypes();
int s;
if (isStatic) {
s = code.addLoadParameters(params, 0);
code.addInvokestatic(deleClass, methodName, desc);
} else {
code.addLoad(0, deleClass);
s = code.addLoadParameters(params, 1);
code.addInvokespecial(deleClass, methodName, desc);
}
code.addReturn(delegate.getReturnType());
code.setMaxLocals(++s);
code.setMaxStack(s < 2 ? 2 : s); // for a 2-word return value
minfo.setCodeAttribute(code.toCodeAttribute());
return new CtMethod(minfo, declaring);
}
/**
* Creates a public setter method. The setter method assigns the value of the first parameter to
* the specified field in the class to which this method is added. The created method is not
* static even if the field is static. You may not change it to be static by <code>setModifiers()
* </code> in <code>CtBehavior</code>.
*
* @param methodName the name of the setter
* @param field the field accessed.
*/
public static CtMethod setter(String methodName, CtField field) throws CannotCompileException {
FieldInfo finfo = field.getFieldInfo2();
String fieldType = finfo.getDescriptor();
String desc = "(" + fieldType + ")V";
ConstPool cp = finfo.getConstPool();
MethodInfo minfo = new MethodInfo(cp, methodName, desc);
minfo.setAccessFlags(AccessFlag.PUBLIC);
Bytecode code = new Bytecode(cp, 3, 3);
try {
String fieldName = finfo.getName();
if ((finfo.getAccessFlags() & AccessFlag.STATIC) == 0) {
code.addAload(0);
code.addLoad(1, field.getType());
code.addPutfield(Bytecode.THIS, fieldName, fieldType);
} else {
code.addLoad(1, field.getType());
code.addPutstatic(Bytecode.THIS, fieldName, fieldType);
}
code.addReturn(null);
} catch (NotFoundException e) {
throw new CannotCompileException(e);
}
minfo.setCodeAttribute(code.toCodeAttribute());
return new CtMethod(minfo, field.getDeclaringClass());
}
/**
* Client proxies are equal to other client proxies for the same bean.
*
* <p>The corresponding java code: <code>
* return other instanceof MyProxyClassType.class
* </code>
*/
@Override
protected MethodInfo generateEqualsMethod(ClassFile proxyClassType) {
MethodInfo method =
new MethodInfo(proxyClassType.getConstPool(), "equals", "(Ljava/lang/Object;)Z");
method.setAccessFlags(AccessFlag.PUBLIC);
Bytecode b = new Bytecode(proxyClassType.getConstPool());
b.addAload(1);
b.addInstanceof(proxyClassType.getName());
b.add(Opcode.IRETURN);
b.setMaxLocals(2);
b.setMaxStack(1);
method.setCodeAttribute(b.toCodeAttribute());
return method;
}
/** Client proxies use the following hashCode: <code>MyProxyName.class.hashCode()</code> */
@Override
protected MethodInfo generateHashCodeMethod(ClassFile proxyClassType) {
MethodInfo method = new MethodInfo(proxyClassType.getConstPool(), "hashCode", "()I");
method.setAccessFlags(AccessFlag.PUBLIC);
Bytecode b = new Bytecode(proxyClassType.getConstPool());
// MyProxyName.class.hashCode()
int classLocation = proxyClassType.getConstPool().addClassInfo(proxyClassType.getName());
b.addLdc(classLocation);
// now we have the class object on top of the stack
b.addInvokevirtual("java.lang.Object", "hashCode", "()I");
// now we have the hashCode
b.add(Opcode.IRETURN);
b.setMaxLocals(1);
b.setMaxStack(1);
method.setCodeAttribute(b.toCodeAttribute());
return method;
}
/** Add a method to a class that simply delegates to the parent implementation of the method */
public static void addDelegatingMethod(ClassFile file, MethodData mData)
throws BadBytecode, DuplicateMemberException {
MethodInfo m =
new MethodInfo(file.getConstPool(), mData.getMethodName(), mData.getDescriptor());
m.setAccessFlags(mData.getAccessFlags());
Bytecode code = new Bytecode(file.getConstPool());
String[] params = DescriptorUtils.descriptorStringToParameterArray(mData.getDescriptor());
code.add(Opcode.ALOAD_0); // push this
int count = 1; // zero is the this pointer
int maxLocals = 1;
for (String p : params) {
// int char short boolean byte
if (p.equals("I") || p.equals("C") || p.equals("S") || p.equals("Z") || p.equals("B")) {
// push integer 0
code.addIload(count);
maxLocals++;
}
// long
else if (p.equals("J")) {
code.addLload(count);
maxLocals += 2;
count++;
}
// double
else if (p.equals("D")) {
code.addDload(count);
maxLocals += 2;
count++;
}
// float
else if (p.equals("F")) {
code.addFload(count);
maxLocals++;
}
// arrays and reference types
else {
code.addAload(count);
maxLocals++;
}
count++;
}
code.addInvokespecial(file.getSuperclass(), mData.getMethodName(), mData.getDescriptor());
String p = DescriptorUtils.getReturnTypeInJvmFormat(mData.getDescriptor());
// int char short boolean byte
if (p.equals("I") || p.equals("C") || p.equals("S") || p.equals("Z") || p.equals("B")) {
code.add(Opcode.IRETURN);
}
// long
else if (p.equals("J")) {
code.add(Opcode.LRETURN);
}
// double
else if (p.equals("D")) {
code.add(Opcode.DRETURN);
}
// float
else if (p.equals("F")) {
code.add(Opcode.FRETURN);
}
// void
else if (p.equals("V")) {
code.add(Opcode.RETURN);
}
// arrays and reference types
else {
code.add(Opcode.ARETURN);
}
CodeAttribute ca = code.toCodeAttribute();
ca.computeMaxStack();
ca.setMaxLocals(maxLocals);
m.setCodeAttribute(ca);
file.addMethod(m);
}