org.slc.sli.dal.template.MongoEntityTemplate.java Source code

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Here is the source code for org.slc.sli.dal.template.MongoEntityTemplate.java

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/*
 * Copyright 2012-2013 inBloom, Inc. and its affiliates.
 *
 * 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 org.slc.sli.dal.template;

import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.ReadPreference;
import org.springframework.data.mapping.context.MappingContext;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.QueryMapper;
import org.springframework.data.mongodb.core.convert.MongoConverter;
import org.springframework.data.mongodb.core.mapping.MongoPersistentEntity;
import org.springframework.data.mongodb.core.mapping.MongoPersistentProperty;
import org.springframework.data.mongodb.core.query.Query;

import java.util.Iterator;

/**
 *
 * @author ablum npandey
 *
 */
public class MongoEntityTemplate extends MongoTemplate {

    private QueryMapper mapper;
    private final MappingContext<? extends MongoPersistentEntity<?>, MongoPersistentProperty> mappingContext;

    public MongoEntityTemplate(MongoDbFactory mongoDbFactory, MongoConverter mongoConverter) {
        super(mongoDbFactory, mongoConverter);
        this.mapper = new QueryMapper(mongoConverter);
        mappingContext = mongoConverter.getMappingContext();
    }

    public <T> Iterator<T> findEach(final Query query, final Class<T> entityClass, String collectionName) {
        MongoPersistentEntity<?> entity = mappingContext.getPersistentEntity(entityClass);

        DBCollection collection = getDb().getCollection(collectionName);

        prepareCollection(collection);

        DBObject dbQuery = mapper.getMappedObject(query.getQueryObject(), entity);
        final DBCursor cursor;

        if (query.getFieldsObject() == null) {
            cursor = collection.find(dbQuery);
        } else {
            cursor = collection.find(dbQuery, query.getFieldsObject());
        }

        return new Iterator<T>() {
            @Override
            public boolean hasNext() {
                // TODO Auto-generated method stub
                return cursor.hasNext();
            }

            @Override
            public T next() {
                return getConverter().read(entityClass, cursor.next());
            }

            @Override
            public void remove() {
                cursor.remove();
            }
        };
    }
}