001/* 002 * Copyright 2002-2016 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.beans.propertyeditors; 018 019import java.beans.PropertyEditorSupport; 020import java.io.IOException; 021 022import org.springframework.core.io.Resource; 023import org.springframework.core.io.ResourceEditor; 024import org.springframework.core.io.support.EncodedResource; 025import org.springframework.util.Assert; 026 027/** 028 * One-way PropertyEditor which can convert from a text String to a 029 * {@code java.io.Reader}, interpreting the given String as a Spring 030 * resource location (e.g. a URL String). 031 * 032 * <p>Supports Spring-style URL notation: any fully qualified standard URL 033 * ("file:", "http:", etc.) and Spring's special "classpath:" pseudo-URL. 034 * 035 * <p>Note that such readers usually do not get closed by Spring itself! 036 * 037 * @author Juergen Hoeller 038 * @since 4.2 039 * @see java.io.Reader 040 * @see org.springframework.core.io.ResourceEditor 041 * @see org.springframework.core.io.ResourceLoader 042 * @see InputStreamEditor 043 */ 044public class ReaderEditor extends PropertyEditorSupport { 045 046 private final ResourceEditor resourceEditor; 047 048 049 /** 050 * Create a new ReaderEditor, using the default ResourceEditor underneath. 051 */ 052 public ReaderEditor() { 053 this.resourceEditor = new ResourceEditor(); 054 } 055 056 /** 057 * Create a new ReaderEditor, using the given ResourceEditor underneath. 058 * @param resourceEditor the ResourceEditor to use 059 */ 060 public ReaderEditor(ResourceEditor resourceEditor) { 061 Assert.notNull(resourceEditor, "ResourceEditor must not be null"); 062 this.resourceEditor = resourceEditor; 063 } 064 065 066 @Override 067 public void setAsText(String text) throws IllegalArgumentException { 068 this.resourceEditor.setAsText(text); 069 Resource resource = (Resource) this.resourceEditor.getValue(); 070 try { 071 setValue(resource != null ? new EncodedResource(resource).getReader() : null); 072 } 073 catch (IOException ex) { 074 throw new IllegalArgumentException("Failed to retrieve Reader for " + resource, ex); 075 } 076 } 077 078 /** 079 * This implementation returns {@code null} to indicate that 080 * there is no appropriate text representation. 081 */ 082 @Override 083 public String getAsText() { 084 return null; 085 } 086 087}