Java Code Examples for org.springframework.core.GenericTypeResolver#resolveReturnType()

@Override
public synchronized Class<?> getPropertyType() {
	if (this.propertyType == null) {
		if (this.readMethod != null) {
			this.propertyType = GenericTypeResolver.resolveReturnType(this.readMethod, this.beanClass);
		}
		else {
			MethodParameter writeMethodParam = getWriteMethodParameter();
			if (writeMethodParam != null) {
				this.propertyType = writeMethodParam.getParameterType();
			}
			else {
				this.propertyType = super.getPropertyType();
			}
		}
	}
	return this.propertyType;
}
 

/**
 * Derive the model attribute name for the given return value. Results will be
 * based on:
 * <ol>
 * <li>the method {@code ModelAttribute} annotation value
 * <li>the declared return type if it is more specific than {@code Object}
 * <li>the actual return value type
 * </ol>
 * @param returnValue the value returned from a method invocation
 * @param returnType a descriptor for the return type of the method
 * @return the derived name (never {@code null} or empty String)
 */
public static String getNameForReturnValue(@Nullable Object returnValue, MethodParameter returnType) {
	ModelAttribute ann = returnType.getMethodAnnotation(ModelAttribute.class);
	if (ann != null && StringUtils.hasText(ann.value())) {
		return ann.value();
	}
	else {
		Method method = returnType.getMethod();
		Assert.state(method != null, "No handler method");
		Class<?> containingClass = returnType.getContainingClass();
		Class<?> resolvedType = GenericTypeResolver.resolveReturnType(method, containingClass);
		return Conventions.getVariableNameForReturnType(method, resolvedType, returnValue);
	}
}
 

/**
 * Derive the model attribute name for the given return value. Results will be
 * based on:
 * <ol>
 * <li>the method {@code ModelAttribute} annotation value
 * <li>the declared return type if it is more specific than {@code Object}
 * <li>the actual return value type
 * </ol>
 * @param returnValue the value returned from a method invocation
 * @param returnType a descriptor for the return type of the method
 * @return the derived name (never {@code null} or empty String)
 */
public static String getNameForReturnValue(@Nullable Object returnValue, MethodParameter returnType) {
	ModelAttribute ann = returnType.getMethodAnnotation(ModelAttribute.class);
	if (ann != null && StringUtils.hasText(ann.value())) {
		return ann.value();
	}
	else {
		Method method = returnType.getMethod();
		Assert.state(method != null, "No handler method");
		Class<?> containingClass = returnType.getContainingClass();
		Class<?> resolvedType = GenericTypeResolver.resolveReturnType(method, containingClass);
		return Conventions.getVariableNameForReturnType(method, resolvedType, returnValue);
	}
}
 

/**
 * Derive the model attribute name for the given return value based on:
 * <ol>
 * <li>the method {@code ModelAttribute} annotation value
 * <li>the declared return type if it is more specific than {@code Object}
 * <li>the actual return value type
 * </ol>
 * @param returnValue the value returned from a method invocation
 * @param returnType a descriptor for the return type of the method
 * @return the derived name (never {@code null} or empty String)
 */
public static String getNameForReturnValue(Object returnValue, MethodParameter returnType) {
	ModelAttribute ann = returnType.getMethodAnnotation(ModelAttribute.class);
	if (ann != null && StringUtils.hasText(ann.value())) {
		return ann.value();
	}
	else {
		Method method = returnType.getMethod();
		Class<?> containingClass = returnType.getContainingClass();
		Class<?> resolvedType = GenericTypeResolver.resolveReturnType(method, containingClass);
		return Conventions.getVariableNameForReturnType(method, resolvedType, returnValue);
	}
}
 

protected final void addReturnValueAsModelAttribute(Method handlerMethod, Class<?> handlerType,
		Object returnValue, ExtendedModelMap implicitModel) {

	ModelAttribute attr = AnnotationUtils.findAnnotation(handlerMethod, ModelAttribute.class);
	String attrName = (attr != null ? attr.value() : "");
	if ("".equals(attrName)) {
		Class<?> resolvedType = GenericTypeResolver.resolveReturnType(handlerMethod, handlerType);
		attrName = Conventions.getVariableNameForReturnType(handlerMethod, resolvedType, returnValue);
	}
	implicitModel.addAttribute(attrName, returnValue);
}
 

/**
 * Determine the expected type as the returned type of the method.
 * If the return type is a List it will return the generic element type instead of a List.
 * @param resource - resource with methods
 * @param method Method
 * @return Class - type of class it needs.
 */
@SuppressWarnings("rawtypes")
protected static Class determineType(Class resource, Method method)
{
    Method resolvedMethod = BridgeMethodResolver.findBridgedMethod(method);

    /*
    * The api is consistent that the object passed in must match the object passed out
    * however, operations are different, if the param is supplied  it doesn't have to match
    * the return type.
    * So we need special logic for operations
     */
    Annotation annot = AnnotationUtils.findAnnotation(resolvedMethod, Operation.class);
    if (annot != null)
    {
        return determineOperationType(resource, method);
    }
    else
    {
        Class returnType = GenericTypeResolver.resolveReturnType(resolvedMethod, resource);
        if (List.class.isAssignableFrom(returnType))
        {
            return ResolvableType.forMethodReturnType(method).asCollection().getGeneric(0).resolve();
        }
        return returnType;
    }
}
 

/**
 * Derive the model attribute name for the given return value using one of:
 * <ol>
 * 	<li>The method {@code ModelAttribute} annotation value
 * 	<li>The declared return type if it is more specific than {@code Object}
 * 	<li>The actual return value type
 * </ol>
 * @param returnValue the value returned from a method invocation
 * @param returnType the return type of the method
 * @return the model name, never {@code null} nor empty
 */
public static String getNameForReturnValue(Object returnValue, MethodParameter returnType) {
	ModelAttribute annotation = returnType.getMethodAnnotation(ModelAttribute.class);
	if (annotation != null && StringUtils.hasText(annotation.value())) {
		return annotation.value();
	}
	else {
		Method method = returnType.getMethod();
		Class<?> resolvedType = GenericTypeResolver.resolveReturnType(method, returnType.getContainingClass());
		return Conventions.getVariableNameForReturnType(method, resolvedType, returnValue);
	}
}
 

protected final void addReturnValueAsModelAttribute(Method handlerMethod, Class<?> handlerType,
		Object returnValue, ExtendedModelMap implicitModel) {

	ModelAttribute attr = AnnotationUtils.findAnnotation(handlerMethod, ModelAttribute.class);
	String attrName = (attr != null ? attr.value() : "");
	if ("".equals(attrName)) {
		Class<?> resolvedType = GenericTypeResolver.resolveReturnType(handlerMethod, handlerType);
		attrName = Conventions.getVariableNameForReturnType(handlerMethod, resolvedType, returnValue);
	}
	implicitModel.addAttribute(attrName, returnValue);
}
 

public GenericTypeAwarePropertyDescriptor(Class<?> beanClass, String propertyName,
		@Nullable Method readMethod, @Nullable Method writeMethod, Class<?> propertyEditorClass)
		throws IntrospectionException {

	super(propertyName, null, null);
	this.beanClass = beanClass;

	Method readMethodToUse = (readMethod != null ? BridgeMethodResolver.findBridgedMethod(readMethod) : null);
	Method writeMethodToUse = (writeMethod != null ? BridgeMethodResolver.findBridgedMethod(writeMethod) : null);
	if (writeMethodToUse == null && readMethodToUse != null) {
		// Fallback: Original JavaBeans introspection might not have found matching setter
		// method due to lack of bridge method resolution, in case of the getter using a
		// covariant return type whereas the setter is defined for the concrete property type.
		Method candidate = ClassUtils.getMethodIfAvailable(
				this.beanClass, "set" + StringUtils.capitalize(getName()), (Class<?>[]) null);
		if (candidate != null && candidate.getParameterCount() == 1) {
			writeMethodToUse = candidate;
		}
	}
	this.readMethod = readMethodToUse;
	this.writeMethod = writeMethodToUse;

	if (this.writeMethod != null) {
		if (this.readMethod == null) {
			// Write method not matched against read method: potentially ambiguous through
			// several overloaded variants, in which case an arbitrary winner has been chosen
			// by the JDK's JavaBeans Introspector...
			Set<Method> ambiguousCandidates = new HashSet<>();
			for (Method method : beanClass.getMethods()) {
				if (method.getName().equals(writeMethodToUse.getName()) &&
						!method.equals(writeMethodToUse) && !method.isBridge() &&
						method.getParameterCount() == writeMethodToUse.getParameterCount()) {
					ambiguousCandidates.add(method);
				}
			}
			if (!ambiguousCandidates.isEmpty()) {
				this.ambiguousWriteMethods = ambiguousCandidates;
			}
		}
		this.writeMethodParameter = new MethodParameter(this.writeMethod, 0);
		GenericTypeResolver.resolveParameterType(this.writeMethodParameter, this.beanClass);
	}

	if (this.readMethod != null) {
		this.propertyType = GenericTypeResolver.resolveReturnType(this.readMethod, this.beanClass);
	}
	else if (this.writeMethodParameter != null) {
		this.propertyType = this.writeMethodParameter.getParameterType();
	}

	this.propertyEditorClass = propertyEditorClass;
}
 

public GenericTypeAwarePropertyDescriptor(Class<?> beanClass, String propertyName,
		@Nullable Method readMethod, @Nullable Method writeMethod, Class<?> propertyEditorClass)
		throws IntrospectionException {

	super(propertyName, null, null);
	this.beanClass = beanClass;

	Method readMethodToUse = (readMethod != null ? BridgeMethodResolver.findBridgedMethod(readMethod) : null);
	Method writeMethodToUse = (writeMethod != null ? BridgeMethodResolver.findBridgedMethod(writeMethod) : null);
	if (writeMethodToUse == null && readMethodToUse != null) {
		// Fallback: Original JavaBeans introspection might not have found matching setter
		// method due to lack of bridge method resolution, in case of the getter using a
		// covariant return type whereas the setter is defined for the concrete property type.
		Method candidate = ClassUtils.getMethodIfAvailable(
				this.beanClass, "set" + StringUtils.capitalize(getName()), (Class<?>[]) null);
		if (candidate != null && candidate.getParameterCount() == 1) {
			writeMethodToUse = candidate;
		}
	}
	this.readMethod = readMethodToUse;
	this.writeMethod = writeMethodToUse;

	if (this.writeMethod != null) {
		if (this.readMethod == null) {
			// Write method not matched against read method: potentially ambiguous through
			// several overloaded variants, in which case an arbitrary winner has been chosen
			// by the JDK's JavaBeans Introspector...
			Set<Method> ambiguousCandidates = new HashSet<>();
			for (Method method : beanClass.getMethods()) {
				if (method.getName().equals(writeMethodToUse.getName()) &&
						!method.equals(writeMethodToUse) && !method.isBridge() &&
						method.getParameterCount() == writeMethodToUse.getParameterCount()) {
					ambiguousCandidates.add(method);
				}
			}
			if (!ambiguousCandidates.isEmpty()) {
				this.ambiguousWriteMethods = ambiguousCandidates;
			}
		}
		this.writeMethodParameter = new MethodParameter(this.writeMethod, 0);
		GenericTypeResolver.resolveParameterType(this.writeMethodParameter, this.beanClass);
	}

	if (this.readMethod != null) {
		this.propertyType = GenericTypeResolver.resolveReturnType(this.readMethod, this.beanClass);
	}
	else if (this.writeMethodParameter != null) {
		this.propertyType = this.writeMethodParameter.getParameterType();
	}

	this.propertyEditorClass = propertyEditorClass;
}
 

public GenericTypeAwarePropertyDescriptor(Class<?> beanClass, String propertyName,
		Method readMethod, Method writeMethod, Class<?> propertyEditorClass)
		throws IntrospectionException {

	super(propertyName, null, null);

	if (beanClass == null)  {
		throw new IntrospectionException("Bean class must not be null");
	}
	this.beanClass = beanClass;

	Method readMethodToUse = BridgeMethodResolver.findBridgedMethod(readMethod);
	Method writeMethodToUse = BridgeMethodResolver.findBridgedMethod(writeMethod);
	if (writeMethodToUse == null && readMethodToUse != null) {
		// Fallback: Original JavaBeans introspection might not have found matching setter
		// method due to lack of bridge method resolution, in case of the getter using a
		// covariant return type whereas the setter is defined for the concrete property type.
		Method candidate = ClassUtils.getMethodIfAvailable(
				this.beanClass, "set" + StringUtils.capitalize(getName()), (Class<?>[]) null);
		if (candidate != null && candidate.getParameterTypes().length == 1) {
			writeMethodToUse = candidate;
		}
	}
	this.readMethod = readMethodToUse;
	this.writeMethod = writeMethodToUse;

	if (this.writeMethod != null) {
		if (this.readMethod == null) {
			// Write method not matched against read method: potentially ambiguous through
			// several overloaded variants, in which case an arbitrary winner has been chosen
			// by the JDK's JavaBeans Introspector...
			Set<Method> ambiguousCandidates = new HashSet<Method>();
			for (Method method : beanClass.getMethods()) {
				if (method.getName().equals(writeMethodToUse.getName()) &&
						!method.equals(writeMethodToUse) && !method.isBridge() &&
						method.getParameterTypes().length == writeMethodToUse.getParameterTypes().length) {
					ambiguousCandidates.add(method);
				}
			}
			if (!ambiguousCandidates.isEmpty()) {
				this.ambiguousWriteMethods = ambiguousCandidates;
			}
		}
		this.writeMethodParameter = new MethodParameter(this.writeMethod, 0);
		GenericTypeResolver.resolveParameterType(this.writeMethodParameter, this.beanClass);
	}

	if (this.readMethod != null) {
		this.propertyType = GenericTypeResolver.resolveReturnType(this.readMethod, this.beanClass);
	}
	else if (this.writeMethodParameter != null) {
		this.propertyType = this.writeMethodParameter.getParameterType();
	}

	this.propertyEditorClass = propertyEditorClass;
}
 

public GenericTypeAwarePropertyDescriptor(Class<?> beanClass, String propertyName,
		Method readMethod, Method writeMethod, Class<?> propertyEditorClass)
		throws IntrospectionException {

	super(propertyName, null, null);

	if (beanClass == null)  {
		throw new IntrospectionException("Bean class must not be null");
	}
	this.beanClass = beanClass;

	Method readMethodToUse = BridgeMethodResolver.findBridgedMethod(readMethod);
	Method writeMethodToUse = BridgeMethodResolver.findBridgedMethod(writeMethod);
	if (writeMethodToUse == null && readMethodToUse != null) {
		// Fallback: Original JavaBeans introspection might not have found matching setter
		// method due to lack of bridge method resolution, in case of the getter using a
		// covariant return type whereas the setter is defined for the concrete property type.
		Method candidate = ClassUtils.getMethodIfAvailable(
				this.beanClass, "set" + StringUtils.capitalize(getName()), (Class<?>[]) null);
		if (candidate != null && candidate.getParameterTypes().length == 1) {
			writeMethodToUse = candidate;
		}
	}
	this.readMethod = readMethodToUse;
	this.writeMethod = writeMethodToUse;

	if (this.writeMethod != null) {
		if (this.readMethod == null) {
			// Write method not matched against read method: potentially ambiguous through
			// several overloaded variants, in which case an arbitrary winner has been chosen
			// by the JDK's JavaBeans Introspector...
			Set<Method> ambiguousCandidates = new HashSet<Method>();
			for (Method method : beanClass.getMethods()) {
				if (method.getName().equals(writeMethodToUse.getName()) &&
						!method.equals(writeMethodToUse) && !method.isBridge() &&
						method.getParameterTypes().length == writeMethodToUse.getParameterTypes().length) {
					ambiguousCandidates.add(method);
				}
			}
			if (!ambiguousCandidates.isEmpty()) {
				this.ambiguousWriteMethods = ambiguousCandidates;
			}
		}
		this.writeMethodParameter = new MethodParameter(this.writeMethod, 0);
		GenericTypeResolver.resolveParameterType(this.writeMethodParameter, this.beanClass);
	}

	if (this.readMethod != null) {
		this.propertyType = GenericTypeResolver.resolveReturnType(this.readMethod, this.beanClass);
	}
	else if (this.writeMethodParameter != null) {
		this.propertyType = this.writeMethodParameter.getParameterType();
	}

	this.propertyEditorClass = propertyEditorClass;
}