com.expediagroup.rhapsody.util.FieldResolution Maven / Gradle / Ivy
/**
* Copyright 2019 Expedia, Inc.
*
* 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 com.expediagroup.rhapsody.util;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.stream.Collectors;
public final class FieldResolution {
private static final Map> FIELDS_BY_CLASS_AND_NAME = new ConcurrentHashMap<>();
private FieldResolution() {
}
public static Field getAccessibleField(Class clazz, String name) {
Field field = getField(clazz, name);
field.setAccessible(true);
return field;
}
public static Field getField(Class clazz, String name) {
Map fieldsByName = FIELDS_BY_CLASS_AND_NAME.computeIfAbsent(clazz, key -> new ConcurrentHashMap<>());
return fieldsByName.computeIfAbsent(name, key -> findField(clazz, name));
}
public static Map getAllFieldsByName(Class clazz) {
return getAllFields(clazz).stream().collect(Collectors.toMap(Field::getName, Function.identity()));
}
public static Collection getAllFields(Class clazz) {
return findAllFields(clazz);
}
private static Field findField(Class clazz, String name) {
return findAllFields(clazz).stream()
.filter(field -> Objects.equals(name, field.getName()))
.findFirst()
.orElseThrow(() -> new IllegalArgumentException(String.format("Failed to extract Field on Class: clazz=%s name=%s", clazz, name)));
}
private static List findAllFields(Class clazz) {
List fields = new ArrayList<>();
while (clazz != null) {
for (Field field : clazz.getDeclaredFields()) {
fields.add(field);
}
clazz = clazz.getSuperclass();
}
return fields;
}
}