@Override
public MethodDelegationBinder.ParameterBinding<?> bind(
AnnotationDescription.Loadable<FieldValue> annotation,
MethodDescription source,
ParameterDescription target,
Implementation.Target implementationTarget,
Assigner assigner) {
FieldLocator.Resolution resolution =
FieldLocator.of(
annotation.getValue(DEFINING_TYPE, TypeDescription.class),
implementationTarget.getTypeDescription())
.resolve(annotation.getValue(FIELD_NAME, String.class), source.isStatic());
if (resolution.isResolved()) {
StackManipulation stackManipulation =
new StackManipulation.Compound(
resolution.getFieldDescription().isStatic()
? StackManipulation.Trivial.INSTANCE
: MethodVariableAccess.REFERENCE.loadOffset(0),
FieldAccess.forField(resolution.getFieldDescription()).getter(),
assigner.assign(
resolution.getFieldDescription().getType().asErasure(),
target.getType().asErasure(),
RuntimeType.Verifier.check(target)));
return stackManipulation.isValid()
? new MethodDelegationBinder.ParameterBinding.Anonymous(stackManipulation)
: MethodDelegationBinder.ParameterBinding.Illegal.INSTANCE;
} else {
return MethodDelegationBinder.ParameterBinding.Illegal.INSTANCE;
}
}
@Test
public void testBoxing() throws Exception {
StackManipulation boxingStackManipulation =
PrimitiveBoxingDelegate.forPrimitive(primitiveTypeDescription)
.assignBoxedTo(targetType, chainedAssigner, Assigner.Typing.STATIC);
assertThat(boxingStackManipulation.isValid(), is(true));
StackManipulation.Size size =
boxingStackManipulation.apply(methodVisitor, implementationContext);
assertThat(size.getSizeImpact(), is(sizeChange));
assertThat(size.getMaximalSize(), is(0));
verify(primitiveTypeDescription).represents(primitiveType);
verify(primitiveTypeDescription, atLeast(1)).represents(any(Class.class));
verifyNoMoreInteractions(primitiveTypeDescription);
verify(chainedAssigner)
.assign(referenceTypeDescription.asGenericType(), targetType, Assigner.Typing.STATIC);
verifyNoMoreInteractions(chainedAssigner);
verify(methodVisitor)
.visitMethodInsn(
Opcodes.INVOKESTATIC,
referenceTypeDescription.getInternalName(),
VALUE_OF,
boxingMethodDescriptor,
false);
verifyNoMoreInteractions(methodVisitor);
verify(stackManipulation, atLeast(1)).isValid();
verify(stackManipulation).apply(methodVisitor, implementationContext);
verifyNoMoreInteractions(stackManipulation);
}
@Test
public void testAssignmentEqual() throws Exception {
StackManipulation stackManipulation =
Assigner.EqualTypesOnly.INSTANCE.assign(first, first, dynamicallyTyped);
assertThat(stackManipulation.isValid(), is(true));
StackManipulation.Size size = stackManipulation.apply(methodVisitor, implementationContext);
assertThat(size.getSizeImpact(), is(0));
assertThat(size.getMaximalSize(), is(0));
}
@Test(expected = IllegalStateException.class)
public void testTargetToSourceAssignable() throws Exception {
defineAssignability(false, true);
StackManipulation stackManipulation =
ReferenceTypeAwareAssigner.INSTANCE.assign(
sourceTypeDescription, targetTypeDescription, false);
assertThat(stackManipulation.isValid(), is(false));
stackManipulation.apply(methodVisitor, implementationContext);
}
@Test(expected = IllegalStateException.class)
public void testPrimitiveAssignabilityWhenNotEqual() throws Exception {
TypeDescription primitiveType =
new TypeDescription.ForLoadedType(int.class); // Note: cannot mock equals
TypeDescription otherPrimitiveType =
new TypeDescription.ForLoadedType(long.class); // Note: cannot mock equals
StackManipulation stackManipulation =
ReferenceTypeAwareAssigner.INSTANCE.assign(primitiveType, otherPrimitiveType, true);
assertThat(stackManipulation.isValid(), is(false));
stackManipulation.apply(methodVisitor, implementationContext);
}
@Before
public void setUp() throws Exception {
when(chainedAssigner.assign(
any(TypeDescription.Generic.class),
any(TypeDescription.Generic.class),
any(Assigner.Typing.class)))
.thenReturn(stackManipulation);
when(stackManipulation.isValid()).thenReturn(true);
when(stackManipulation.apply(any(MethodVisitor.class), any(Implementation.Context.class)))
.thenReturn(StackSize.ZERO.toIncreasingSize());
}
@Before
public void setUp() throws Exception {
when(sourceTypeDescription.represents(sourceType)).thenReturn(true);
when(sourceTypeDescription.isPrimitive()).thenReturn(true);
when(targetTypeDescription.represents(targetType)).thenReturn(true);
when(targetTypeDescription.isPrimitive()).thenReturn(false);
when(chainedStackManipulation.isValid()).thenReturn(true);
when(chainedAssigner.assign(
any(TypeDescription.class), any(TypeDescription.class), any(Assigner.Typing.class)))
.thenReturn(chainedStackManipulation);
primitiveAssigner = new PrimitiveTypeAwareAssigner(chainedAssigner);
}
@Test
public void testPrimitiveAssignabilityWhenEqual() throws Exception {
TypeDescription primitiveType =
new TypeDescription.ForLoadedType(int.class); // Note: cannot mock equals
StackManipulation stackManipulation =
ReferenceTypeAwareAssigner.INSTANCE.assign(primitiveType, primitiveType, true);
assertThat(stackManipulation.isValid(), is(true));
StackManipulation.Size size = stackManipulation.apply(methodVisitor, implementationContext);
assertThat(size.getSizeImpact(), is(0));
assertThat(size.getMaximalSize(), is(0));
verifyZeroInteractions(methodVisitor);
}
@Test
public void testSourceToTargetAssignable() throws Exception {
defineAssignability(true, false);
StackManipulation stackManipulation =
ReferenceTypeAwareAssigner.INSTANCE.assign(
sourceTypeDescription, targetTypeDescription, false);
assertThat(stackManipulation.isValid(), is(true));
StackManipulation.Size size = stackManipulation.apply(methodVisitor, implementationContext);
assertThat(size.getSizeImpact(), is(0));
assertThat(size.getMaximalSize(), is(0));
verifyZeroInteractions(methodVisitor);
}
@Test
public void testTargetToSourceAssignableRuntimeType() throws Exception {
defineAssignability(false, false);
when(targetTypeDescription.getInternalName()).thenReturn(FOO);
StackManipulation stackManipulation =
ReferenceTypeAwareAssigner.INSTANCE.assign(
sourceTypeDescription, targetTypeDescription, true);
assertThat(stackManipulation.isValid(), is(true));
StackManipulation.Size size = stackManipulation.apply(methodVisitor, implementationContext);
assertThat(size.getSizeImpact(), is(0));
assertThat(size.getMaximalSize(), is(0));
verify(methodVisitor).visitTypeInsn(Opcodes.CHECKCAST, FOO);
verifyNoMoreInteractions(methodVisitor);
}
/**
* Blueprint method that for applying the actual implementation.
*
* @param methodVisitor The method visitor to which the implementation is applied to.
* @param implementationContext The implementation context for the given implementation.
* @param instrumentedMethod The instrumented method that is target of the implementation.
* @param fixedValueType A description of the type of the fixed value that is loaded by the {@code
* valueLoadingInstruction}.
* @param valueLoadingInstruction A stack manipulation that represents the loading of the fixed
* value onto the operand stack.
* @return A representation of the stack and variable array sized that are required for this
* implementation.
*/
protected ByteCodeAppender.Size apply(
MethodVisitor methodVisitor,
Context implementationContext,
MethodDescription instrumentedMethod,
TypeDescription.Generic fixedValueType,
StackManipulation valueLoadingInstruction) {
StackManipulation assignment =
assigner.assign(fixedValueType, instrumentedMethod.getReturnType(), typing);
if (!assignment.isValid()) {
throw new IllegalArgumentException(
"Cannot return value of type " + fixedValueType + " for " + instrumentedMethod);
}
StackManipulation.Size stackSize =
new StackManipulation.Compound(
valueLoadingInstruction,
assignment,
MethodReturn.returning(instrumentedMethod.getReturnType().asErasure()))
.apply(methodVisitor, implementationContext);
return new ByteCodeAppender.Size(stackSize.getMaximalSize(), instrumentedMethod.getStackSize());
}
@Test
public void testBoxingAssignment() {
StackManipulation stackManipulation =
primitiveAssigner.assign(
sourceTypeDescription, targetTypeDescription, Assigner.Typing.STATIC);
assertThat(stackManipulation.isValid(), is(assignable));
verify(chainedStackManipulation).isValid();
verifyNoMoreInteractions(chainedStackManipulation);
verify(sourceTypeDescription, atLeast(0)).represents(any(Class.class));
verify(sourceTypeDescription).represents(sourceType);
verify(sourceTypeDescription, atLeast(1)).isPrimitive();
verifyNoMoreInteractions(sourceTypeDescription);
verify(targetTypeDescription, atLeast(1)).isPrimitive();
verifyNoMoreInteractions(targetTypeDescription);
verify(chainedAssigner)
.assign(
new TypeDescription.ForLoadedType(targetType),
targetTypeDescription,
Assigner.Typing.STATIC);
verifyNoMoreInteractions(chainedAssigner);
}
@Test
public void testAssignmentNotEqual() throws Exception {
StackManipulation stackManipulation =
Assigner.EqualTypesOnly.INSTANCE.assign(first, second, dynamicallyTyped);
assertThat(stackManipulation.isValid(), is(false));
}
@Override
public boolean isValid() {
return stackManipulation.isValid();
}