/**
* Copyright 2010-2012 Ralph Schaer <ralphschaer@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ch.ralscha.extdirectspring.util;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import org.springframework.core.GenericTypeResolver;
import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
import org.springframework.core.MethodParameter;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ValueConstants;
/**
* Object holds information about a parameter. i.e. the name, type and the
* attributes of a RequestParam annotation.
*/
public final class ParameterInfo {
private static final LocalVariableTableParameterNameDiscoverer discoverer = new LocalVariableTableParameterNameDiscoverer();
private String name;
private final TypeDescriptor typeDescriptor;
private final boolean supportedParameter;
private boolean hasRequestParamAnnotation;
private boolean hasRequestHeaderAnnotation;
private boolean required;
private String defaultValue;
public ParameterInfo(Method method, int paramIndex) {
MethodParameter methodParam = new MethodParameter(method, paramIndex);
methodParam.initParameterNameDiscovery(discoverer);
GenericTypeResolver.resolveParameterType(methodParam, method.getClass());
this.name = methodParam.getParameterName();
this.typeDescriptor = new TypeDescriptor(methodParam);
this.supportedParameter = SupportedParameters.isSupported(typeDescriptor.getObjectType());
Annotation[] paramAnnotations = methodParam.getParameterAnnotations();
for (Annotation paramAnn : paramAnnotations) {
if (RequestParam.class.isInstance(paramAnn)) {
RequestParam requestParam = (RequestParam) paramAnn;
if (StringUtils.hasText(requestParam.value())) {
this.name = requestParam.value();
}
this.required = requestParam.required();
this.defaultValue = ValueConstants.DEFAULT_NONE.equals(requestParam.defaultValue()) ? null
: requestParam.defaultValue();
this.hasRequestParamAnnotation = true;
this.hasRequestHeaderAnnotation = false;
break;
} else if (RequestHeader.class.isInstance(paramAnn)) {
RequestHeader requestHeader = (RequestHeader) paramAnn;
if (StringUtils.hasText(requestHeader.value())) {
this.name = requestHeader.value();
}
this.required = requestHeader.required();
this.defaultValue = ValueConstants.DEFAULT_NONE.equals(requestHeader.defaultValue()) ? null
: requestHeader.defaultValue();
this.hasRequestParamAnnotation = false;
this.hasRequestHeaderAnnotation = true;
break;
}
}
}
public Class<?> getType() {
return typeDescriptor.getType();
}
public Class<?> getCollectionType() {
if (typeDescriptor.isCollection() && typeDescriptor.getElementTypeDescriptor() != null) {
return typeDescriptor.getElementTypeDescriptor().getType();
}
return null;
}
public String getName() {
return name;
}
public boolean isHasRequestParamAnnotation() {
return hasRequestParamAnnotation;
}
public boolean isHasRequestHeaderAnnotation() {
return hasRequestHeaderAnnotation;
}
public boolean isRequired() {
return required;
}
public String getDefaultValue() {
return defaultValue;
}
public boolean isSupportedParameter() {
return supportedParameter;
}
public TypeDescriptor getTypeDescriptor() {
return typeDescriptor;
}
}