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}