/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.flink.test.streaming.runtime.util;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class TestListWrapper {
private static TestListWrapper instance;
@SuppressWarnings("rawtypes")
private List<List<? extends Comparable>> lists;
@SuppressWarnings("rawtypes")
private TestListWrapper() {
lists = Collections.synchronizedList(new ArrayList<List<? extends Comparable>>());
}
public static TestListWrapper getInstance() {
if (instance == null) {
instance = new TestListWrapper();
}
return instance;
}
/**
* Creates and stores a list, returns with the id.
*
* @return The ID of the list.
*/
@SuppressWarnings("rawtypes")
public int createList() {
lists.add(new ArrayList<Comparable>());
return lists.size() - 1;
}
public List<?> getList(int listId) {
@SuppressWarnings("rawtypes")
List<? extends Comparable> list = lists.get(listId);
if (list == null) {
throw new RuntimeException("No such list.");
}
return list;
}
}