/*
* 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.hadoop.hbase.util;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Utility methods for Iterable including null-safe handlers.
*/
public class IterableUtils {
private static final List<Object> EMPTY_LIST = Collections
.unmodifiableList(new ArrayList<Object>(0));
@SuppressWarnings("unchecked")
public static <T> Iterable<T> nullSafe(Iterable<T> in) {
if (in == null) {
return (List<T>) EMPTY_LIST;
}
return in;
}
}