org.springframework.core.io.FileSystemResource Maven / Gradle / Ivy
/*
* 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.core.io;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import org.springframework.util.Assert;
import org.springframework.util.ResourceUtils;
import org.springframework.util.StringUtils;
/**
* {@link Resource} implementation for java.io.File handles.
* Obviously supports resolution as File, and also as URL.
*
* @author Juergen Hoeller
* @since 28.12.2003
* @see java.io.File
*/
public class FileSystemResource extends AbstractResource {
private final File file;
private final String path;
/**
* Create a new FileSystemResource.
* @param file a File handle
*/
public FileSystemResource(File file) {
Assert.notNull(file, "File must not be null");
this.file = file;
this.path = StringUtils.cleanPath(file.getPath());
}
/**
* Create a new FileSystemResource.
* @param path a file path
*/
public FileSystemResource(String path) {
Assert.notNull(path, "Path must not be null");
this.file = new File(path);
this.path = StringUtils.cleanPath(path);
}
/**
* Return the file path for this resource.
*/
public final String getPath() {
return this.path;
}
/**
* This implementation returns whether the underlying file exists.
* @see java.io.File#exists()
*/
public boolean exists() {
return this.file.exists();
}
/**
* This implementation opens a FileInputStream for the underlying file.
* @see java.io.FileInputStream
*/
public InputStream getInputStream() throws IOException {
return new FileInputStream(this.file);
}
/**
* This implementation returns a URL for the underlying file.
* @see java.io.File#getAbsolutePath()
*/
public URL getURL() throws IOException {
return new URL(ResourceUtils.FILE_URL_PREFIX + this.file.getAbsolutePath());
}
/**
* This implementation returns the underlying File reference.
*/
public File getFile() {
return file;
}
/**
* This implementation creates a FileSystemResource, applying the given path
* relative to the path of the underlying file of this resource descriptor.
* @see org.springframework.util.StringUtils#applyRelativePath(String, String)
*/
public Resource createRelative(String relativePath) {
String pathToUse = StringUtils.applyRelativePath(this.path, relativePath);
return new FileSystemResource(pathToUse);
}
/**
* This implementation returns the name of the file.
* @see java.io.File#getName()
*/
public String getFilename() {
return this.file.getName();
}
/**
* This implementation returns a description that includes the absolute
* path of the file.
* @see java.io.File#getAbsolutePath()
*/
public String getDescription() {
return "file [" + this.file.getAbsolutePath() + "]";
}
/**
* This implementation compares the underlying File references.
*/
public boolean equals(Object obj) {
return (obj == this ||
(obj instanceof FileSystemResource && this.path.equals(((FileSystemResource) obj).path)));
}
/**
* This implementation returns the hash code of the underlying File reference.
*/
public int hashCode() {
return this.path.hashCode();
}
}