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Polish PathVariableMapMethodArgumentResolver

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Return an empty map when there are no path variables, rather than
raising an exception. This is consistent with similar resolvers for
extracting headers and request parameters.

Issue: SPR-9289
This commit is contained in:
Rossen Stoyanchev
2012-06-26 10:23:01 -04:00
parent 4fd7645efd
commit 3f5fa44d32
2 changed files with 14 additions and 11 deletions
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17
spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/PathVariableMapMethodArgumentResolver.java
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@@ -22,7 +22,6 @@ import java.util.Map;
import org.springframework.core.MethodParameter;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
@@ -31,6 +30,8 @@ import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;
import org.springframework.web.servlet.HandlerMapping;
import edu.emory.mathcs.backport.java.util.Collections;
/**
* Resolves {@link Map} method arguments annotated with an @{@link PathVariable}
* where the annotation does not specify a path variable name. The created
@@ -49,9 +50,7 @@ public class PathVariableMapMethodArgumentResolver implements HandlerMethodArgum
}
/**
* Return a Map with all URI template variables.
* @throws ServletRequestBindingException if no URI vars are found in the
* request attribute {@link HandlerMapping#URI_TEMPLATE_VARIABLES_ATTRIBUTE}
* Return a Map with all URI template variables or an empty map.
*/
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
@@ -61,12 +60,12 @@ public class PathVariableMapMethodArgumentResolver implements HandlerMethodArgum
(Map<String, String>) webRequest.getAttribute(
HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE, RequestAttributes.SCOPE_REQUEST);
if (CollectionUtils.isEmpty(uriTemplateVars)) {
throw new ServletRequestBindingException(
"No URI template variables for method parameter type [" + parameter.getParameterType() + "]");
if (!CollectionUtils.isEmpty(uriTemplateVars)) {
return new LinkedHashMap<String, String>(uriTemplateVars);
}
else {
return Collections.emptyMap();
}
return new LinkedHashMap<String, String>(uriTemplateVars);
}
}