com.mongodb.DefaultDBCallback Maven / Gradle / Ivy
/*
* Copyright 2008-present MongoDB, 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.mongodb;
import org.bson.BSONObject;
import org.bson.BasicBSONCallback;
import org.bson.types.BasicBSONList;
import org.bson.types.ObjectId;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* An implementation of DBCallback that decodes into a DBObject.
*/
public class DefaultDBCallback extends BasicBSONCallback implements DBCallback {
private final DBObjectFactory objectFactory;
/**
* Creates a new DefaultDBCallback. If the Collection is null, it uses {@link DBCollectionObjectFactory} to create documents, otherwise
* it uses the collection's object factory.
*
* @param collection an optionally null Collection that the documents created by this callback belong to.
*/
public DefaultDBCallback(final DBCollection collection) {
if (collection != null) {
this.objectFactory = collection.getObjectFactory();
} else {
this.objectFactory = new DBCollectionObjectFactory();
}
}
@Override
public BSONObject create() {
return objectFactory.getInstance();
}
@Override
public BSONObject create(final boolean array, final List path) {
return array ? new BasicDBList() : objectFactory.getInstance(path != null ? path : Collections.emptyList());
}
@Override
public void gotDBRef(final String name, final String namespace, final ObjectId id) {
_put(name, new DBRef(namespace, id));
}
@Override
public Object objectDone() {
String name = curName();
BSONObject document = (BSONObject) super.objectDone();
if (!(document instanceof BasicBSONList)) {
Iterator iterator = document.keySet().iterator();
if (iterator.hasNext() && iterator.next().equals("$ref") && iterator.hasNext() && iterator.next().equals("$id")) {
_put(name, new DBRef((String) document.get("$db"), (String) document.get("$ref"), document.get("$id")));
}
}
return document;
}
public static final DBCallbackFactory FACTORY = new DBCallbackFactory() {
@Override
public DBCallback create(final DBCollection collection) {
return new DefaultDBCallback(collection);
}
};
}