Java Collection Empty isNullOrEmpty(Collection list)

Description

is Null Or Empty

License

Open Source License

Parameter

Parameter	Description
files	a parameter

Declaration

public static boolean isNullOrEmpty(Collection<?> list) 

Method Source Code

//package com.java2s;
/*//w  ww.  ja v  a  2 s. com
 * Copyright 2012 The Solmix Project
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.gnu.org/licenses/ 
 * or see the FSF site: http://www.fsf.org. 
 */

import java.util.Collection;

import java.util.Map;

public class Main {
    static public boolean isNullOrEmpty(String str) {
        return (str == null || str.trim().length() < 1);
    }

    /**
     * @param clause
     * @return
     */
    public static boolean isNullOrEmpty(StringBuffer sb) {

        return !(sb != null && sb.length() > 0);
    }

    /**
     * @param files
     * @return
     */
    public static boolean isNullOrEmpty(Collection<?> list) {
        return list == null || list.size() < 1;
    }

    public static <T> boolean isNullOrEmpty(T[] list) {
        return list == null || list.length < 1;
    }

    public static boolean isNullOrEmpty(Map<?, ?> map) {
        return map == null || map.isEmpty();
    }

    /**
     * <p>Checks if a String is empty ("") or null.</p>
     *
     * <pre>
     * DataUtils.isEmpty(null)      = true
     * DataUtils.isEmpty("")        = true
     * DataUtils.isEmpty(" ")       = false
     * DataUtils.isEmpty("bob")     = false
     * DataUtils.isEmpty("  bob  ") = false
     * </pre>
     *
     * <p>NOTE: This method changed in Lang version 2.0.
     * It no longer trims the String.
     * That functionality is available in isBlank().</p>
     */
    public static boolean isEmpty(String str) {
        return str == null || str.length() == 0;
    }
}

Related

1. isNullOrEmpty(Collection coll)
2. isNullOrEmpty(Collection collection)
3. isNullOrEmpty(Collection collection)
4. isNullOrEmpty(Collection col)
5. isNullOrEmpty(Collection collection)
6. isNullOrEmpty(Collection obj)
7. isNullOrEmpty(Collection s)
8. isNullOrEmpty(Collection values)
9. isNullOrEmpty(final Collection c)