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Copy pathFieldQueryMapEncoder.java
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83 lines (72 loc) · 2.84 KB
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/**
* Copyright 2012-2019 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.QueryMapEncoder;
import feign.codec.EncodeException;
import java.lang.reflect.Field;
import java.util.*;
import java.util.stream.Collectors;
/**
* the query map will be generated using member variable names 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 FieldQueryMapEncoder 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> fieldNameToValue = new HashMap<String, Object>();
for (Field field : metadata.objectFields) {
Object value = field.get(object);
if (value != null && value != object) {
fieldNameToValue.put(field.getName(), value);
}
}
return fieldNameToValue;
} catch (IllegalAccessException e) {
throw new EncodeException("Failure encoding object into query map", e);
}
}
private ObjectParamMetadata getMetadata(Class<?> objectType) {
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<Field> objectFields;
private ObjectParamMetadata(List<Field> objectFields) {
this.objectFields = Collections.unmodifiableList(objectFields);
}
private static ObjectParamMetadata parseObjectType(Class<?> type) {
List<Field> allFields = new ArrayList();
for (Class currentClass = type; currentClass != null; currentClass =
currentClass.getSuperclass()) {
Collections.addAll(allFields, currentClass.getDeclaredFields());
}
return new ObjectParamMetadata(allFields.stream()
.filter(field -> !field.isSynthetic())
.peek(field -> field.setAccessible(true))
.collect(Collectors.toList()));
}
}
}