private CodegenExpression CodegenGet(
Type requiredType,
CodegenMethodScope codegenMethodScope,
ExprForgeCodegenSymbol exprSymbol,
CodegenClassScope codegenClassScope)
{
if (returnType == null) {
return ConstantNull();
}
var castTargetType = GetCodegenReturnType(requiredType);
var useUnderlying = exprSymbol.IsAllowUnderlyingReferences &&
!identNode.ResolvedPropertyName.Contains("?") &&
!(eventType is WrapperEventType) &&
!(eventType is VariantEventType);
if (useUnderlying && !optionalEvent) {
var underlying = exprSymbol.GetAddRequiredUnderlying(
codegenMethodScope,
streamNum,
eventType,
false);
var property = propertyGetter.UnderlyingGetCodegen(underlying, codegenMethodScope, codegenClassScope);
return CodegenLegoCast.CastSafeFromObjectType(castTargetType, property);
}
var method = codegenMethodScope.MakeChild(
castTargetType, this.GetType(), codegenClassScope);
var block = method.Block;
if (useUnderlying) {
var underlying = exprSymbol.GetAddRequiredUnderlying(
method,
streamNum,
eventType,
true);
if (castTargetType.CanNotBeNull()) {
#if THROW_VALUE_ON_NULL
block.IfRefNullThrowException(underlying);
#else
block
.IfRefNull(underlying)
.BlockReturn(new CodegenExpressionDefault(castTargetType));
#endif
}
else {
block.IfRefNullReturnNull(underlying);
}
block.MethodReturn(
CodegenLegoCast.CastSafeFromObjectType(
castTargetType,
propertyGetter.UnderlyingGetCodegen(underlying, method, codegenClassScope)));
}
else {
var refEPS = exprSymbol.GetAddEPS(method);
method.Block.DeclareVar<EventBean>("@event", ArrayAtIndex(refEPS, Constant(streamNum)));
if (optionalEvent) {
if (castTargetType.CanNotBeNull()) {
#if THROW_VALUE_ON_NULL
block.IfRefNullThrowException(Ref("@event"));
#else
block
.IfRefNull(Ref("@event"))
.BlockReturn(new CodegenExpressionDefault(castTargetType));
#endif
}
else {
block.IfRefNullReturnNull(Ref("@event"));
}
}
block.MethodReturn(
CodegenLegoCast.CastSafeFromObjectType(
castTargetType,
propertyGetter.EventBeanGetCodegen(Ref("@event"), method, codegenClassScope)));
}
return LocalMethod(method);
}