/*
* Copyright 2006-2014 the original author or authors.
*
* 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.springframework.batch.sample.common;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import java.util.ArrayList;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
import org.springframework.batch.item.ExecutionContext;
import org.springframework.batch.item.ItemReader;
import org.springframework.batch.item.ItemStream;
import org.springframework.batch.item.ItemStreamException;
/**
* Unit test class that was used as part of the Reference Documentation. I'm only including it in the
* code to help keep the reference documentation up to date as the code base shifts.
*
* @author Lucas Ward
*
*/
public class CustomItemReaderTests {
private ItemReader<String> itemReader;
/* (non-Javadoc)
* @see junit.framework.TestCase#setUp()
*/
@Before
public void setUp() throws Exception {
List<String> items = new ArrayList<String>();
items.add("1");
items.add("2");
items.add("3");
itemReader = new CustomItemReader<String>(items);
}
@Test
public void testRead() throws Exception{
assertEquals("1", itemReader.read());
assertEquals("2", itemReader.read());
assertEquals("3", itemReader.read());
assertNull(itemReader.read());
}
@Test
public void testRestart() throws Exception{
ExecutionContext executionContext = new ExecutionContext();
((ItemStream)itemReader).open(executionContext);
assertEquals("1", itemReader.read());
((ItemStream)itemReader).update(executionContext);
List<String> items = new ArrayList<String>();
items.add("1");
items.add("2");
items.add("3");
itemReader = new CustomItemReader<String>(items);
((ItemStream)itemReader).open(executionContext);
assertEquals("2", itemReader.read());
}
public static class CustomItemReader<T> implements ItemReader<T>, ItemStream {
private static final String CURRENT_INDEX = "current.index";
private List<T> items;
private int currentIndex = 0;
public CustomItemReader(List<T> items) {
this.items = items;
}
@Override
public T read() throws Exception {
if (currentIndex < items.size()) {
return items.get(currentIndex++);
}
return null;
}
@Override
public void open(ExecutionContext executionContext) throws ItemStreamException {
if(executionContext.containsKey(CURRENT_INDEX)){
currentIndex = executionContext.getInt(CURRENT_INDEX);
}
else{
currentIndex = 0;
}
}
@Override
public void close() throws ItemStreamException {}
@Override
public void update(ExecutionContext executionContext) throws ItemStreamException {
executionContext.putInt(CURRENT_INDEX, currentIndex);
}
}
}