/*
* Copyright (c) 2013-2017 Cinchapi Inc.
*
* 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 com.cinchapi.concourse.util;
import java.util.Collection;
import javax.annotation.Nullable;
import com.google.common.base.Strings;
/**
* Utilities for general Objects.
*
* @author jnelson
*/
public class ObjectUtils {
/**
* Return {@code true} if {@code value} is {@code null} or considered empty.
* A value is considered empty if:
* <ul>
* <li>It is a collection with no members</li>
* <li>It is an array with a length of 0</li>
* <li>It is a string with no characters</li>
* </ul>
*
* @param value
* @return {@code true} if the object is considered null or empty
*/
public static boolean isNullOrEmpty(Object value) {
return value == null
|| (value instanceof Collection && ((Collection<?>) value)
.isEmpty())
|| (value.getClass().isArray() && ((Object[]) value).length == 0)
|| (value instanceof String && Strings
.isNullOrEmpty((String) value));
}
/**
* This method is similar to {@link Objects#firstNonNull(Object, Object)}
* except it takes an arbitrary number of arguments and it won't throw a NPE
* of all the objects are null.
*
* @param objects
* @return the first non-null object
*/
@SafeVarargs
@Nullable
public static <T> T firstNonNullOrNull(T... objects) {
for (T object : objects) {
if(object != null) {
return object;
}
}
return null;
}
}