1 /* 2 * $Id$ 3 * 4 * Licensed to the Apache Software Foundation (ASF) under one 5 * or more contributor license agreements. See the NOTICE file 6 * distributed with this work for additional information 7 * regarding copyright ownership. The ASF licenses this file 8 * to you under the Apache License, Version 2.0 (the 9 * "License"); you may not use this file except in compliance 10 * with the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, 15 * software distributed under the License is distributed on an 16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 17 * KIND, either express or implied. See the License for the 18 * specific language governing permissions and limitations 19 * under the License. 20 */ 21 package org.apache.struts.validator.validwhen; 22 23 /** 24 * Holds the (interim) result during processing the parsing-tree. 25 * The result has is a {@code String}. 26 * 27 * @author Graff Stefan 28 * 29 * @since Struts 1.4.1 30 */ 31 public class ValidWhenResultString extends ValidWhenResult<String> { 32 33 /** 34 * Constructs this class with the type {@code String}. 35 * 36 * @param value the current value of 37 * the result 38 */ 39 public ValidWhenResultString(String value) { 40 super(String.class, initValue(value)); 41 } 42 43 /** 44 * Trims the {@code value} and returns {@code null} 45 * if the {@code value} is empty. 46 * 47 * @param value the value 48 * 49 * @return the trimmed {@code String} or {@code null} 50 */ 51 private static String initValue(String value) { 52 if (value == null) { 53 return null; 54 } 55 56 String s = value.trim(); 57 return s.isEmpty() ? null : s; 58 } 59 }