public void addSetMethod(MetaBeanProperty property) throws Exception {
MetaMethod setter = property.getSetter();
Type paramType = Type.getType(setter.getParameterTypes()[0].getTheClass());
Type returnType = Type.getType(setter.getReturnType());
String setterDescriptor = Type.getMethodDescriptor(returnType, new Type[] {paramType});
// GENERATE public void <propName>(<type> v) { <setter>(v) }
String setMethodDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {paramType});
MethodVisitor methodVisitor =
visitor.visitMethod(
Opcodes.ACC_PUBLIC, property.getName(), setMethodDescriptor, null, new String[0]);
methodVisitor.visitCode();
// GENERATE <setter>(v)
methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
methodVisitor.visitVarInsn(paramType.getOpcode(Opcodes.ILOAD), 1);
methodVisitor.visitMethodInsn(
Opcodes.INVOKEVIRTUAL,
generatedType.getInternalName(),
setter.getName(),
setterDescriptor);
// END
methodVisitor.visitInsn(Opcodes.RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
}
public void addGetter(MetaBeanProperty property) throws Exception {
MetaMethod getter = property.getGetter();
// GENERATE private boolean <prop>Set;
String flagName = String.format("%sSet", property.getName());
visitor.visitField(
Opcodes.ACC_PRIVATE, flagName, Type.BOOLEAN_TYPE.getDescriptor(), null, null);
addConventionGetter(getter.getName(), flagName, property);
String getterName = getter.getName();
Class<?> returnType = getter.getReturnType();
// If it's a boolean property, there can be get or is type variants.
// If this class has both, decorate both.
if (returnType.equals(Boolean.TYPE)) {
boolean getterIsIsMethod = getterName.startsWith("is");
String propertyNameComponent = getterName.substring(getterIsIsMethod ? 2 : 3);
String alternativeGetterName =
String.format("%s%s", getterIsIsMethod ? "get" : "is", propertyNameComponent);
try {
type.getMethod(alternativeGetterName);
addConventionGetter(alternativeGetterName, flagName, property);
} catch (NoSuchMethodException e) {
// ignore, no method to override
}
}
}
public void addSetter(MetaBeanProperty property) throws Exception {
MetaMethod setter = property.getSetter();
// GENERATE public <return-type> <setter>(<type> v) { <return-type> v = super.<setter>(v);
// <prop>Set = true; return v; }
Type paramType = Type.getType(setter.getParameterTypes()[0].getTheClass());
Type returnType = Type.getType(setter.getReturnType());
String setterDescriptor = Type.getMethodDescriptor(returnType, new Type[] {paramType});
MethodVisitor methodVisitor =
visitor.visitMethod(
Opcodes.ACC_PUBLIC, setter.getName(), setterDescriptor, null, new String[0]);
methodVisitor.visitCode();
// GENERATE super.<setter>(v)
methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
methodVisitor.visitVarInsn(paramType.getOpcode(Opcodes.ILOAD), 1);
methodVisitor.visitMethodInsn(
Opcodes.INVOKESPECIAL,
superclassType.getInternalName(),
setter.getName(),
setterDescriptor);
// END
// GENERATE <prop>Set = true
methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
methodVisitor.visitLdcInsn(true);
methodVisitor.visitFieldInsn(
Opcodes.PUTFIELD,
generatedType.getInternalName(),
String.format("%sSet", property.getName()),
Type.BOOLEAN_TYPE.getDescriptor());
// END
methodVisitor.visitInsn(returnType.getOpcode(Opcodes.IRETURN));
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
}
public void addActionMethod(MetaMethod method) throws Exception {
Type actionImplType = Type.getType(ClosureBackedAction.class);
Type closureType = Type.getType(Closure.class);
String methodDescriptor = Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {closureType});
// GENERATE public void <method>(Closure v) { <method>(new ClosureBackedAction(v)); }
MethodVisitor methodVisitor =
visitor.visitMethod(
Opcodes.ACC_PUBLIC, method.getName(), methodDescriptor, null, new String[0]);
methodVisitor.visitCode();
// GENERATE <method>(new ClosureBackedAction(v));
methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
// GENERATE new ClosureBackedAction(v);
methodVisitor.visitTypeInsn(Opcodes.NEW, actionImplType.getInternalName());
methodVisitor.visitInsn(Opcodes.DUP);
methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
String constuctorDescriptor =
Type.getMethodDescriptor(Type.VOID_TYPE, new Type[] {closureType});
methodVisitor.visitMethodInsn(
Opcodes.INVOKESPECIAL, actionImplType.getInternalName(), "<init>", constuctorDescriptor);
methodDescriptor =
Type.getMethodDescriptor(
Type.getType(method.getReturnType()),
new Type[] {Type.getType(method.getParameterTypes()[0].getTheClass())});
methodVisitor.visitMethodInsn(
Opcodes.INVOKEVIRTUAL,
generatedType.getInternalName(),
method.getName(),
methodDescriptor);
methodVisitor.visitInsn(Opcodes.RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
}
private void addConventionGetter(String getterName, String flagName, MetaBeanProperty property)
throws Exception {
// GENERATE public <type> <getter>() { return
// (<type>)getConventionMapping().getConventionValue(super.<getter>(), '<prop>', <prop>Set); }
MetaMethod getter = property.getGetter();
Type returnType = Type.getType(getter.getReturnType());
String methodDescriptor = Type.getMethodDescriptor(returnType, new Type[0]);
MethodVisitor methodVisitor =
visitor.visitMethod(
Opcodes.ACC_PUBLIC, getterName, methodDescriptor, null, new String[0]);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
methodVisitor.visitMethodInsn(
Opcodes.INVOKEINTERFACE,
conventionAwareType.getInternalName(),
"getConventionMapping",
Type.getMethodDescriptor(conventionMappingType, new Type[0]));
methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
methodVisitor.visitMethodInsn(
Opcodes.INVOKESPECIAL, superclassType.getInternalName(), getterName, methodDescriptor);
Type boxedType = null;
if (getter.getReturnType().isPrimitive()) {
// Box value
boxedType =
Type.getType(JavaReflectionUtil.getWrapperTypeForPrimitiveType(getter.getReturnType()));
String valueOfMethodDescriptor =
Type.getMethodDescriptor(boxedType, new Type[] {returnType});
methodVisitor.visitMethodInsn(
Opcodes.INVOKESTATIC, boxedType.getInternalName(), "valueOf", valueOfMethodDescriptor);
}
methodVisitor.visitLdcInsn(property.getName());
methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
methodVisitor.visitFieldInsn(
Opcodes.GETFIELD,
generatedType.getInternalName(),
flagName,
Type.BOOLEAN_TYPE.getDescriptor());
String getConventionValueDesc =
Type.getMethodDescriptor(
ConventionMapping.class.getMethod(
"getConventionValue", Object.class, String.class, Boolean.TYPE));
methodVisitor.visitMethodInsn(
Opcodes.INVOKEINTERFACE,
conventionMappingType.getInternalName(),
"getConventionValue",
getConventionValueDesc);
if (getter.getReturnType().isPrimitive()) {
// Unbox value
methodVisitor.visitTypeInsn(Opcodes.CHECKCAST, boxedType.getInternalName());
String valueMethodDescriptor = Type.getMethodDescriptor(returnType, new Type[0]);
methodVisitor.visitMethodInsn(
Opcodes.INVOKEVIRTUAL,
boxedType.getInternalName(),
getter.getReturnType().getName() + "Value",
valueMethodDescriptor);
} else {
// Cast to return type
methodVisitor.visitTypeInsn(
Opcodes.CHECKCAST,
getter.getReturnType().isArray()
? "[" + returnType.getElementType().getDescriptor()
: returnType.getInternalName());
}
methodVisitor.visitInsn(returnType.getOpcode(Opcodes.IRETURN));
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
}