001/*
002 * oauth2-oidc-sdk
003 *
004 * Copyright 2012-2016, Connect2id Ltd and contributors.
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use
007 * this file except in compliance with the License. You may obtain a copy of the
008 * License at
009 *
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software distributed
013 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
014 * CONDITIONS OF ANY KIND, either express or implied. See the License for the
015 * specific language governing permissions and limitations under the License.
016 */
017
018package com.nimbusds.oauth2.sdk.util;
019
020
021/**
022 * String utilities. Replicates Apache Commons Lang 3.
023 */
024public final class StringUtils {
025        
026        
027        /**
028         * Returns {@code true} if the specified char sequence is all blank,
029         * empty or {@code null}.
030         *
031         * @param cs The char sequence. May be {@code null}.
032         *
033         * @return {@code true} if the specified char sequence is all blank,
034         *         empty or {@code null}, else {@code false}.
035         */
036        public static boolean isBlank(CharSequence cs) {
037                
038                int strLen;
039                if (cs != null && (strLen = cs.length()) != 0) {
040                        for(int i = 0; i < strLen; ++i) {
041                                if (!Character.isWhitespace(cs.charAt(i))) {
042                                        return false;
043                                }
044                        }
045                        
046                        return true;
047                } else {
048                        return true;
049                }
050        }
051        
052        
053        /**
054         * Returns {@code true} if the specified char sequence is not all
055         * blank, not empty and not {@code null}.
056         *
057         * @param cs The char sequence. May be {@code null}.
058         *
059         * @return {@code true} if the specified char sequence is not all
060         *         blank, not empty and not {@code null}, else {@code false}.
061         */
062        public static boolean isNotBlank(CharSequence cs) {
063                
064                return !isBlank(cs);
065        }
066        
067        
068        /**
069         * Prevents public instantiation.
070         */
071        private StringUtils() {}
072}