spring ReaderEditor 源码
spring ReaderEditor 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/propertyeditors/ReaderEditor.java
/*
* Copyright 2002-2016 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.beans.propertyeditors;
import java.beans.PropertyEditorSupport;
import java.io.IOException;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceEditor;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* One-way PropertyEditor which can convert from a text String to a
* {@code java.io.Reader}, interpreting the given String as a Spring
* resource location (e.g. a URL String).
*
* <p>Supports Spring-style URL notation: any fully qualified standard URL
* ("file:", "http:", etc.) and Spring's special "classpath:" pseudo-URL.
*
* <p>Note that such readers usually do not get closed by Spring itself!
*
* @author Juergen Hoeller
* @since 4.2
* @see java.io.Reader
* @see org.springframework.core.io.ResourceEditor
* @see org.springframework.core.io.ResourceLoader
* @see InputStreamEditor
*/
public class ReaderEditor extends PropertyEditorSupport {
private final ResourceEditor resourceEditor;
/**
* Create a new ReaderEditor, using the default ResourceEditor underneath.
*/
public ReaderEditor() {
this.resourceEditor = new ResourceEditor();
}
/**
* Create a new ReaderEditor, using the given ResourceEditor underneath.
* @param resourceEditor the ResourceEditor to use
*/
public ReaderEditor(ResourceEditor resourceEditor) {
Assert.notNull(resourceEditor, "ResourceEditor must not be null");
this.resourceEditor = resourceEditor;
}
@Override
public void setAsText(String text) throws IllegalArgumentException {
this.resourceEditor.setAsText(text);
Resource resource = (Resource) this.resourceEditor.getValue();
try {
setValue(resource != null ? new EncodedResource(resource).getReader() : null);
}
catch (IOException ex) {
throw new IllegalArgumentException("Failed to retrieve Reader for " + resource, ex);
}
}
/**
* This implementation returns {@code null} to indicate that
* there is no appropriate text representation.
*/
@Override
@Nullable
public String getAsText() {
return null;
}
}
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