Java Code Examples for org.springframework.web.method.support.ModelAndViewContainer#setBinding()

The following examples show how to use org.springframework.web.method.support.ModelAndViewContainer#setBinding() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: ModelAttributeMethodProcessor.java    From spring-analysis-note with MIT License 4 votes vote down vote up 
/**
 * Resolve the argument from the model or if not found instantiate it with
 * its default if it is available. The model attribute is then populated
 * with request values via data binding and optionally validated
 * if {@code @java.validation.Valid} is present on the argument.
 * @throws BindException if data binding and validation result in an error
 * and the next method parameter is not of type {@link Errors}
 * @throws Exception if WebDataBinder initialization fails
 */
@Override
@Nullable
public final Object resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer,
		NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception {

	Assert.state(mavContainer != null, "ModelAttributeMethodProcessor requires ModelAndViewContainer");
	Assert.state(binderFactory != null, "ModelAttributeMethodProcessor requires WebDataBinderFactory");

	String name = ModelFactory.getNameForParameter(parameter);
	ModelAttribute ann = parameter.getParameterAnnotation(ModelAttribute.class);
	if (ann != null) {
		mavContainer.setBinding(name, ann.binding());
	}

	Object attribute = null;
	BindingResult bindingResult = null;

	if (mavContainer.containsAttribute(name)) {
		attribute = mavContainer.getModel().get(name);
	}
	else {
		// Create attribute instance
		try {
			attribute = createAttribute(name, parameter, binderFactory, webRequest);
		}
		catch (BindException ex) {
			if (isBindExceptionRequired(parameter)) {
				// No BindingResult parameter -> fail with BindException
				throw ex;
			}
			// Otherwise, expose null/empty value and associated BindingResult
			if (parameter.getParameterType() == Optional.class) {
				attribute = Optional.empty();
			}
			bindingResult = ex.getBindingResult();
		}
	}

	if (bindingResult == null) {
		// Bean property binding and validation;
		// skipped in case of binding failure on construction.
		WebDataBinder binder = binderFactory.createBinder(webRequest, attribute, name);
		if (binder.getTarget() != null) {
			if (!mavContainer.isBindingDisabled(name)) {
				bindRequestParameters(binder, webRequest);
			}
			validateIfApplicable(binder, parameter);
			if (binder.getBindingResult().hasErrors() && isBindExceptionRequired(binder, parameter)) {
				throw new BindException(binder.getBindingResult());
			}
		}
		// Value type adaptation, also covering java.util.Optional
		if (!parameter.getParameterType().isInstance(attribute)) {
			attribute = binder.convertIfNecessary(binder.getTarget(), parameter.getParameterType(), parameter);
		}
		bindingResult = binder.getBindingResult();
	}

	// Add resolved attribute and BindingResult at the end of the model
	Map<String, Object> bindingResultModel = bindingResult.getModel();
	mavContainer.removeAttributes(bindingResultModel);
	mavContainer.addAllAttributes(bindingResultModel);

	return attribute;
}
Example 2
Source File: ModelAttributeMethodProcessor.java    From java-technology-stack with MIT License 4 votes vote down vote up 
/**
 * Resolve the argument from the model or if not found instantiate it with
 * its default if it is available. The model attribute is then populated
 * with request values via data binding and optionally validated
 * if {@code @java.validation.Valid} is present on the argument.
 * @throws BindException if data binding and validation result in an error
 * and the next method parameter is not of type {@link Errors}
 * @throws Exception if WebDataBinder initialization fails
 */
@Override
@Nullable
public final Object resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer,
		NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception {

	Assert.state(mavContainer != null, "ModelAttributeMethodProcessor requires ModelAndViewContainer");
	Assert.state(binderFactory != null, "ModelAttributeMethodProcessor requires WebDataBinderFactory");

	String name = ModelFactory.getNameForParameter(parameter);
	ModelAttribute ann = parameter.getParameterAnnotation(ModelAttribute.class);
	if (ann != null) {
		mavContainer.setBinding(name, ann.binding());
	}

	Object attribute = null;
	BindingResult bindingResult = null;

	if (mavContainer.containsAttribute(name)) {
		attribute = mavContainer.getModel().get(name);
	}
	else {
		// Create attribute instance
		try {
			attribute = createAttribute(name, parameter, binderFactory, webRequest);
		}
		catch (BindException ex) {
			if (isBindExceptionRequired(parameter)) {
				// No BindingResult parameter -> fail with BindException
				throw ex;
			}
			// Otherwise, expose null/empty value and associated BindingResult
			if (parameter.getParameterType() == Optional.class) {
				attribute = Optional.empty();
			}
			bindingResult = ex.getBindingResult();
		}
	}

	if (bindingResult == null) {
		// Bean property binding and validation;
		// skipped in case of binding failure on construction.
		WebDataBinder binder = binderFactory.createBinder(webRequest, attribute, name);
		if (binder.getTarget() != null) {
			if (!mavContainer.isBindingDisabled(name)) {
				bindRequestParameters(binder, webRequest);
			}
			validateIfApplicable(binder, parameter);
			if (binder.getBindingResult().hasErrors() && isBindExceptionRequired(binder, parameter)) {
				throw new BindException(binder.getBindingResult());
			}
		}
		// Value type adaptation, also covering java.util.Optional
		if (!parameter.getParameterType().isInstance(attribute)) {
			attribute = binder.convertIfNecessary(binder.getTarget(), parameter.getParameterType(), parameter);
		}
		bindingResult = binder.getBindingResult();
	}

	// Add resolved attribute and BindingResult at the end of the model
	Map<String, Object> bindingResultModel = bindingResult.getModel();
	mavContainer.removeAttributes(bindingResultModel);
	mavContainer.addAllAttributes(bindingResultModel);

	return attribute;
}