1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * - Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 11 * - Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * - Neither the name of Oracle nor the names of its 16 * contributors may be used to endorse or promote products derived 17 * from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * This source code is provided to illustrate the usage of a given feature 34 * or technique and has been deliberately simplified. Additional steps 35 * required for a production-quality application, such as security checks, 36 * input validation and proper error handling, might not be present in 37 * this sample code. 38 */ 39 import javax.xml.bind.ValidationException; 40 import java.util.function.Supplier; 41 42 /** 43 * Enum of Validator implementations. 44 */ 45 public enum Validator { 46 47 /** 48 * This validator checks that the string represents an integer. 49 */ 50 INTEGER_NUMBER { 51 /** 52 * Checks that the string represents an integer. 53 * 54 * @param string - a string supplier 55 * @throws ValidationException if the validation check fails 56 */ 57 @Override validate(Supplier<?> string)58 void validate(Supplier<?> string) throws ValidationException { 59 try { 60 Integer.parseInt((String) string.get()); 61 } catch (NumberFormatException ex) { 62 throw new ValidationException("Error while validating " 63 + string.get()); 64 } 65 } 66 }, 67 /** 68 * This validator checks that the string represents a positive number. 69 */ 70 POSITIVE_NUMBER { 71 /** 72 * Checks that the string represents a positive number. 73 * 74 * @param string - an string supplier 75 * @throws ValidationException if the validation check fails 76 */ 77 @Override validate(Supplier<?> string)78 void validate(Supplier<?> string) throws ValidationException { 79 try { 80 if (Double.compare(0.0, Double.parseDouble( 81 (String) string.get())) > 0) { 82 throw new Exception(); 83 } 84 } catch (Exception ex) { 85 throw new ValidationException("Error while validating " 86 + string.get()); 87 } 88 } 89 }; 90 91 /** 92 * Checks that the supplier is valid. 93 * 94 * @param string - a string supplier 95 * @throws ValidationException if validation check fails 96 */ validate(Supplier<?> string)97 abstract void validate(Supplier<?> string) throws ValidationException; 98 99 } 100