com.dattack.jtoolbox.util.CollectionUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jtoolbox-core Show documentation

Utility classes that only depends on JDK

There is a newer version: 0.7

/*
 * Copyright (c) 2016, The Dattack team (http://www.dattack.com)
 *
 * 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.dattack.jtoolbox.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Objects;

/**
 * Provides utility methods for Collection instances.
 *
 * @author cvarela
 * @since 0.1
 */
public final class CollectionUtils {

    /**
     * Null-safe check if the specified collection is empty.
     *
     * @param collection
     *            the collection to check
     * @return true if empty or null
     */
    public static boolean isEmpty(final Collection collection) {
        return Objects.isNull(collection) || collection.isEmpty();
    }

    /**
     * Null-safe check if the specified collection is not empty.
     *
     * @param collection
     *            the collection to check
     * @return true if non-null and non-empty
     */
    public static boolean isNotEmpty(final Collection collection) {
        return !isEmpty(collection);
    }

    /**
     * Adapts a Object-value List to a String-value one. If the list to adapt is null, then an
     * empty list is returned.
     *
     * @param list
     *            the List to adapt, may be null
     * @return the adapted List
     */
    public static List listAsString(final List