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Spring Framework example source code file (FileEditor.java)

This example Spring Framework source code file (FileEditor.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

bean, could, file, file, fileeditor, fileeditor, illegalargumentexception, illegalargumentexception, io, ioexception, javabean, propertyeditorsupport, resource, resourceeditor, resourceeditor, string

The Spring Framework FileEditor.java source code

/*
 * Copyright 2002-2006 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
 *
 *      http://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.File;
import java.io.IOException;

import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceEditor;
import org.springframework.util.Assert;
import org.springframework.util.ResourceUtils;
import org.springframework.util.StringUtils;

/**
 * Editor for <code>java.io.File, to directly populate a File property
 * from a Spring resource location.
 *
 * <p>Supports Spring-style URL notation: any fully qualified standard URL
 * ("file:", "http:", etc) and Spring's special "classpath:" pseudo-URL.
 *
 * <p>NOTE: The behavior of this editor has changed in Spring 2.0.
 * Previously, it created a File instance directly from a filename.
 * As of Spring 2.0, it takes a standard Spring resource location as input;
 * this is consistent with URLEditor and InputStreamEditor now.
 *
 * <p>NOTE: In Spring 2.5 the following modification was made.
 * If a file name is specified without a URL prefix or without an absolute path
 * then we try to locate the file using standard ResourceLoader semantics.
 * If the file was not found, then a File instance is created assuming the file
 * name refers to a relative file location.
 *
 * @author Juergen Hoeller
 * @author Thomas Risberg
 * @since 09.12.2003
 * @see java.io.File
 * @see org.springframework.core.io.ResourceEditor
 * @see org.springframework.core.io.ResourceLoader
 * @see URLEditor
 * @see InputStreamEditor
 */
public class FileEditor extends PropertyEditorSupport {

	private final ResourceEditor resourceEditor;


	/**
	 * Create a new FileEditor,
	 * using the default ResourceEditor underneath.
	 */
	public FileEditor() {
		this.resourceEditor = new ResourceEditor();
	}

	/**
	 * Create a new FileEditor,
	 * using the given ResourceEditor underneath.
	 * @param resourceEditor the ResourceEditor to use
	 */
	public FileEditor(ResourceEditor resourceEditor) {
		Assert.notNull(resourceEditor, "ResourceEditor must not be null");
		this.resourceEditor = resourceEditor;
	}


	public void setAsText(String text) throws IllegalArgumentException {
		// Check whether we got an absolute file path without "file:" prefix.
		// For backwards compatibility, we'll consider those as straight file path.
		if (StringUtils.hasText(text) && !ResourceUtils.isUrl(text)) {
			File file = new File(text);
			if (file.isAbsolute()) {
				setValue(file);
				return;
			}
		}

		// Proceed with standard resource location parsing.
		this.resourceEditor.setAsText(text);
		Resource resource = (Resource) this.resourceEditor.getValue();
		// Non URLs will be treated as relative paths if the resource was not found
		if(ResourceUtils.isUrl(text) || resource.exists()) {
			try {
				setValue(resource != null ? resource.getFile() : null);
			}
			catch (IOException ex) {
				throw new IllegalArgumentException(
						"Could not retrieve File for " + resource + ": " + ex.getMessage());
			}
		}
		else {
			// Create a relative File reference and hope for the best
			File file = new File(text);
			setValue(file);
		}
	}

	public String getAsText() {
		File value = (File) getValue();
		return (value != null ? value.getPath() : "");
	}

}

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