| 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.file.transform; |
| 18 | |
| 19 | import java.util.ArrayList; |
| 20 | import java.util.Arrays; |
| 21 | import java.util.List; |
| 22 | |
| 23 | import org.springframework.beans.BeanWrapper; |
| 24 | import org.springframework.beans.BeanWrapperImpl; |
| 25 | import org.springframework.beans.factory.InitializingBean; |
| 26 | import org.springframework.util.Assert; |
| 27 | |
| 28 | /** |
| 29 | * This is a field extractor for a java bean. Given an array of property names, |
| 30 | * it will reflectively call getters on the item and return an array of all the |
| 31 | * values. |
| 32 | * |
| 33 | * @author Dan Garrette |
| 34 | * @since 2.0 |
| 35 | */ |
| 36 | public class BeanWrapperFieldExtractor<T> implements FieldExtractor<T>, InitializingBean { |
| 37 | |
| 38 | private String[] names; |
| 39 | |
| 40 | /** |
| 41 | * @param names field names to be extracted by the {@link #extract(Object)} method. |
| 42 | */ |
| 43 | public void setNames(String[] names) { |
| 44 | Assert.notNull(names, "Names must be non-null"); |
| 45 | this.names = Arrays.asList(names).toArray(new String[names.length]); |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * @see org.springframework.batch.item.file.transform.FieldExtractor#extract(java.lang.Object) |
| 50 | */ |
| 51 | @Override |
| 52 | public Object[] extract(T item) { |
| 53 | List<Object> values = new ArrayList<Object>(); |
| 54 | |
| 55 | BeanWrapper bw = new BeanWrapperImpl(item); |
| 56 | for (String propertyName : this.names) { |
| 57 | values.add(bw.getPropertyValue(propertyName)); |
| 58 | } |
| 59 | return values.toArray(); |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | public void afterPropertiesSet() { |
| 64 | Assert.notNull(names, "The 'names' property must be set."); |
| 65 | } |
| 66 | } |