/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.jooby.internal.couchbase;
import java.lang.reflect.Field;
import java.util.function.Supplier;
import org.jooby.couchbase.GeneratedValue;
import com.couchbase.client.java.repository.annotation.Id;
import com.google.common.base.Throwables;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.util.concurrent.UncheckedExecutionException;
import javaslang.control.Try;
@SuppressWarnings("rawtypes")
public final class IdGenerator {
private static LoadingCache<Class, Field> CACHE = CacheBuilder.newBuilder()
.build(new CacheLoader<Class, Field>() {
@Override
public Field load(final Class key) throws Exception {
if (key == Object.class) {
throw new IllegalArgumentException("Entity class: " + key.getName()
+ " must have an 'id' field or a field annotated with @" + Id.class.getName());
}
Field[] fields = key.getDeclaredFields();
for (Field field : fields) {
if (field.getName().equals("id")) {
field.setAccessible(true);
return field;
} else if (field.getAnnotation(Id.class) != null) {
field.setAccessible(true);
return field;
}
}
return load(key.getSuperclass());
}
});
public static String getIdName(final Object bean) {
return field(bean).getName();
}
public static Object getOrGenId(final Object bean, final Supplier<Long> next) {
Field fid = field(bean);
Object id = getId(bean, fid);
if (id == null && fid.isAnnotationPresent(GeneratedValue.class)) {
if (fid.getType() != Long.class) {
throw new IllegalArgumentException("Generated value must be of type Long: " + fid);
}
id = Try.of(() -> {
Long seq = next.get();
fid.set(bean, seq);
return seq;
}).getOrElseThrow(x -> new IllegalStateException("Can't generate id for: " + fid, x));
}
return id;
}
public static Object getId(final Object bean) {
Field id = field(bean);
return getId(bean, id);
}
private static Field field(final Object bean) {
Field id = Try.of(() -> CACHE.getUnchecked(bean.getClass()))
.getOrElseThrow(x -> Throwables.propagate(((UncheckedExecutionException) x).getCause()));
return id;
}
private static Object getId(final Object bean, final Field id) {
return Try.of(() -> id.get(bean)).get();
}
}