/*
* This file is provided 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 com.basho.riak.client.convert.reflect;
import com.basho.riak.client.cap.VClock;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import com.basho.riak.client.convert.RiakIndex;
import com.basho.riak.client.convert.RiakKey;
import com.basho.riak.client.convert.RiakLinks;
import com.basho.riak.client.convert.RiakUsermeta;
import com.basho.riak.client.convert.RiakVClock;
import com.basho.riak.client.convert.UsermetaField;
/**
* A {@link Callable} that loops over a classes fields and pulls out the fields
* for {@link RiakUsermeta} and {@link RiakKey}
*
* @author russell
*
*/
public class AnnotationScanner implements Callable<AnnotationInfo> {
@SuppressWarnings("rawtypes") private final Class classToScan;
@SuppressWarnings("rawtypes") public AnnotationScanner(Class clazz) {
this.classToScan = clazz;
}
/*
* (non-Javadoc)
*
* @see java.util.concurrent.Callable#call()
*/
public AnnotationInfo call() throws Exception {
Field riakKeyField = null;
Field riakVClockField = null;
Field usermetaMapField = null;
Field linksField = null;
List<UsermetaField> usermetaItemFields = new ArrayList<UsermetaField>();
List<RiakIndexField> indexFields = new ArrayList<RiakIndexField>();
Class currentClass = classToScan;
while(currentClass != Object.class) {
final Field[] fields = currentClass.getDeclaredFields();
for (Field field : fields) {
if (riakKeyField == null && field.isAnnotationPresent(RiakKey.class)) {
riakKeyField = ClassUtil.checkAndFixAccess(field);
}
if (riakVClockField == null && field.isAnnotationPresent(RiakVClock.class)) {
// restrict the field type to byte[] or VClock
if (!(field.getType().isArray() &&
field.getType().getComponentType().equals(byte.class)) &&
!field.getType().isAssignableFrom(VClock.class)
) {
throw new IllegalArgumentException(field.getType().toString());
}
riakVClockField = ClassUtil.checkAndFixAccess(field);
}
if (field.isAnnotationPresent(RiakUsermeta.class)) {
RiakUsermeta a = field.getAnnotation(RiakUsermeta.class);
String key = a.key();
if (!"".equals(key)) {
usermetaItemFields.add(new UsermetaField(ClassUtil.checkAndFixAccess(field)));
} else if (usermetaMapField == null) {
usermetaMapField = ClassUtil.checkAndFixAccess(field);
}
}
if(field.isAnnotationPresent(RiakIndex.class)) {
indexFields.add(new RiakIndexField(ClassUtil.checkAndFixAccess(field)));
}
if (linksField == null && field.isAnnotationPresent(RiakLinks.class)) {
linksField = ClassUtil.checkAndFixAccess(field);
}
}
currentClass = currentClass.getSuperclass();
}
return new AnnotationInfo(riakKeyField, usermetaItemFields, usermetaMapField, indexFields, linksField, riakVClockField);
}
}