| 1 | /* |
| 2 | * Copyright 2006-2007 the original author or authors. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.springframework.batch.item.validator; |
| 18 | |
| 19 | import java.util.Collection; |
| 20 | import java.util.Iterator; |
| 21 | |
| 22 | import org.springframework.beans.factory.InitializingBean; |
| 23 | import org.springframework.util.Assert; |
| 24 | import org.springframework.validation.BeanPropertyBindingResult; |
| 25 | import org.springframework.validation.Errors; |
| 26 | |
| 27 | /** |
| 28 | * Adapts the {@link org.springframework.validation.Validator} interface to |
| 29 | * {@link org.springframework.batch.item.validator.Validator}. |
| 30 | * |
| 31 | * @author Tomas Slanina |
| 32 | * @author Robert Kasanicky |
| 33 | */ |
| 34 | public class SpringValidator implements Validator, InitializingBean { |
| 35 | |
| 36 | private org.springframework.validation.Validator validator; |
| 37 | |
| 38 | /** |
| 39 | * @see Validator#validate(Object) |
| 40 | */ |
| 41 | public void validate(Object item) throws ValidationException { |
| 42 | |
| 43 | if (!validator.supports(item.getClass())) { |
| 44 | throw new ValidationException("Validation failed for " + item + ": " + item.getClass().getName() |
| 45 | + " class is not supported by validator."); |
| 46 | } |
| 47 | |
| 48 | BeanPropertyBindingResult errors = new BeanPropertyBindingResult(item, "item"); |
| 49 | |
| 50 | validator.validate(item, errors); |
| 51 | |
| 52 | if (errors.hasErrors()) { |
| 53 | throw new ValidationException("Validation failed for " + item + ": " + errorsToString(errors)); |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * @return string of field errors followed by global errors. |
| 59 | */ |
| 60 | private String errorsToString(Errors errors) { |
| 61 | StringBuffer builder = new StringBuffer(); |
| 62 | |
| 63 | appendCollection(errors.getFieldErrors(), builder); |
| 64 | appendCollection(errors.getGlobalErrors(), builder); |
| 65 | |
| 66 | return builder.toString(); |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Append the string representation of elements of the collection (separated |
| 71 | * by new lines) to the given StringBuilder. |
| 72 | */ |
| 73 | private void appendCollection(Collection collection, StringBuffer builder) { |
| 74 | for (Iterator iterator = collection.iterator(); iterator.hasNext();) { |
| 75 | builder.append("\n"); |
| 76 | builder.append(iterator.next().toString()); |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | public void setValidator(org.springframework.validation.Validator validator) { |
| 81 | this.validator = validator; |
| 82 | } |
| 83 | |
| 84 | public void afterPropertiesSet() throws Exception { |
| 85 | Assert.notNull(validator, "validator must be set"); |
| 86 | |
| 87 | } |
| 88 | } |