/**
* Transforms the given method type into a stack manipulation that loads its type onto the operand
* stack.
*
* @param methodType The method type that should be loaded onto the operand stack.
* @return A stack manipulation that loads the given method type.
*/
public static StackManipulation of(JavaInstance.MethodType methodType) {
Type[] parameterType = new Type[methodType.getParameterTypes().size()];
int index = 0;
for (TypeDescription typeDescription : methodType.getParameterTypes()) {
parameterType[index++] = Type.getType(typeDescription.getDescriptor());
}
return new MethodTypeConstant(
Type.getMethodType(
Type.getType(methodType.getReturnType().getDescriptor()), parameterType));
}
/**
* Returns a fixed value from any intercepted method. The fixed value is stored in the constant
* pool if this is possible. Java is capable of storing any primitive value, {@link String} values
* and {@link Class} references in the constant pool. Since Java 7, {@code MethodHandle} as well
* as {@code MethodType} references are also supported. Alternatively, the fixed value is stored
* in a static field.
*
* <p>When a value is stored in the class's constant pool, its identity is lost. If an object's
* identity is important, the {@link FixedValue#reference(Object)} method should be used instead.
*
* @param fixedValue The fixed value to return from the method.
* @return An implementation for the given {@code fixedValue}.
*/
public static AssignerConfigurable value(Object fixedValue) {
Class<?> type = fixedValue.getClass();
if (type == String.class) {
return new ForPoolValue(
new TextConstant((String) fixedValue),
TypeDescription.STRING,
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Class.class) {
return new ForPoolValue(
ClassConstant.of(new TypeDescription.ForLoadedType((Class<?>) fixedValue)),
TypeDescription.CLASS,
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Boolean.class) {
return new ForPoolValue(
IntegerConstant.forValue((Boolean) fixedValue),
new TypeDescription.ForLoadedType(boolean.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Byte.class) {
return new ForPoolValue(
IntegerConstant.forValue((Byte) fixedValue),
new TypeDescription.ForLoadedType(byte.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Short.class) {
return new ForPoolValue(
IntegerConstant.forValue((Short) fixedValue),
new TypeDescription.ForLoadedType(short.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Character.class) {
return new ForPoolValue(
IntegerConstant.forValue((Character) fixedValue),
new TypeDescription.ForLoadedType(char.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Integer.class) {
return new ForPoolValue(
IntegerConstant.forValue((Integer) fixedValue),
new TypeDescription.ForLoadedType(int.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Long.class) {
return new ForPoolValue(
LongConstant.forValue((Long) fixedValue),
new TypeDescription.ForLoadedType(long.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Float.class) {
return new ForPoolValue(
FloatConstant.forValue((Float) fixedValue),
new TypeDescription.ForLoadedType(float.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (type == Double.class) {
return new ForPoolValue(
DoubleConstant.forValue((Double) fixedValue),
new TypeDescription.ForLoadedType(double.class),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (JavaType.METHOD_HANDLE.getTypeStub().isAssignableFrom(type)) {
return new ForPoolValue(
MethodHandleConstant.of(JavaInstance.MethodHandle.of(fixedValue)),
new TypeDescription.ForLoadedType(type),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else if (JavaType.METHOD_TYPE.getTypeStub().represents(type)) {
return new ForPoolValue(
MethodTypeConstant.of(JavaInstance.MethodType.of(fixedValue)),
new TypeDescription.ForLoadedType(type),
Assigner.DEFAULT,
Assigner.Typing.STATIC);
} else {
return reference(fixedValue);
}
}