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/**
* Copyright 2012-2020 The Feign Authors
*
* 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 feign.querymap;
import feign.Param;
import feign.QueryMapEncoder;
import feign.codec.EncodeException;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.*;
/**
* the query map will be generated using java beans accessible getter property as query parameter
* names.
*
* eg: "/uri?name={name}&number={number}"
*
* order of included query parameters not guaranteed, and as usual, if any value is null, it will be
* left out
*/
public class BeanQueryMapEncoder implements QueryMapEncoder {
private final Map<Class<?>, ObjectParamMetadata> classToMetadata =
new HashMap<Class<?>, ObjectParamMetadata>();
@Override
public Map<String, Object> encode(Object object) throws EncodeException {
try {
ObjectParamMetadata metadata = getMetadata(object.getClass());
Map<String, Object> propertyNameToValue = new HashMap<String, Object>();
for (PropertyDescriptor pd : metadata.objectProperties) {
Method method = pd.getReadMethod();
Object value = method.invoke(object);
if (value != null && value != object) {
Param alias = method.getAnnotation(Param.class);
String name = alias != null ? alias.value() : pd.getName();
propertyNameToValue.put(name, value);
}
}
return propertyNameToValue;
} catch (IllegalAccessException | IntrospectionException | InvocationTargetException e) {
throw new EncodeException("Failure encoding object into query map", e);
}
}
private ObjectParamMetadata getMetadata(Class<?> objectType) throws IntrospectionException {
ObjectParamMetadata metadata = classToMetadata.get(objectType);
if (metadata == null) {
metadata = ObjectParamMetadata.parseObjectType(objectType);
classToMetadata.put(objectType, metadata);
}
return metadata;
}
private static class ObjectParamMetadata {
private final List<PropertyDescriptor> objectProperties;
private ObjectParamMetadata(List<PropertyDescriptor> objectProperties) {
this.objectProperties = Collections.unmodifiableList(objectProperties);
}
private static ObjectParamMetadata parseObjectType(Class<?> type)
throws IntrospectionException {
List<PropertyDescriptor> properties = new ArrayList<PropertyDescriptor>();
for (PropertyDescriptor pd : Introspector.getBeanInfo(type).getPropertyDescriptors()) {
boolean isGetterMethod = pd.getReadMethod() != null && !"class".equals(pd.getName());
if (isGetterMethod) {
properties.add(pd);
}
}
return new ObjectParamMetadata(properties);
}
}
}