001/*
002 * Copyright 2012 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.batch.item.data;
018
019import java.util.ArrayList;
020import java.util.Iterator;
021
022import org.neo4j.ogm.session.Session;
023
024/**
025 * <p>
026 * Extensions of the {@link AbstractNeo4jItemReader}.
027 * </p>
028 *
029 * @author Michael Minella
030 */
031public class Neo4jItemReader<T> extends AbstractNeo4jItemReader<T> {
032
033        @SuppressWarnings("unchecked")
034        @Override
035        protected Iterator<T> doPageRead() {
036                Session session = getSessionFactory().openSession();
037
038                Iterable<T> queryResults = session.query(getTargetType(),
039                                generateLimitCypherQuery(),
040                                getParameterValues());
041
042                if(queryResults != null) {
043                        return queryResults.iterator();
044                }
045                else {
046                        return new ArrayList<T>().iterator();
047                }
048        }
049}