/*
* Copyright 2005 Joe Walker
*
* 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.directwebremoting.io;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import org.directwebremoting.extend.InputStreamFactoryOutputStreamLoader;
import org.directwebremoting.extend.OutputStreamLoaderInputStreamFactory;
import org.directwebremoting.extend.SimpleInputStreamFactory;
import org.directwebremoting.util.CopyUtils;
/**
* One of the 2 ways you can receive uploaded files from a DWR enabled page is
* to expose a method with a {@link FileTransfer} parameter.
* The other is to expose a method with an {@link InputStream} parameter.
* @author Lance Semmens [uklance at gmail dot com]
* @author Joe Walker [joe at getahead dot ltd dot uk]
* @author Niklas Johansson [niklas dot json at gmail dot com]
*/
public class FileTransfer
{
/**
* A ctor for the 3 things browsers tell us about the uploaded file
* @param filename The remote source filename
* @param mimeType The mime type passed in by the browser
* @param outputStreamLoader A means by which the data can be read
*/
public FileTransfer(String filename, String mimeType, OutputStreamLoader outputStreamLoader)
{
this.filename = filename;
this.mimeType = mimeType;
this.outputStreamLoader = outputStreamLoader;
this.size = -1;
this.inputStreamFactory = null;
}
/**
* A ctor for the 3 things browsers tell us about the uploaded file
*/
public FileTransfer(BufferedImage image, String type)
{
this(image, "image", type);
}
/**
* A ctor for the 3 things browsers tell us about the uploaded file
*/
public FileTransfer(final BufferedImage image, String filename, final String type)
{
this.filename = filename;
this.mimeType = "image/" + type;
this.outputStreamLoader = new OutputStreamLoader()
{
public void load(OutputStream out) throws IOException
{
ImageIO.write(image, type, out);
}
public void close() throws IOException
{
}
};
this.size = -1;
this.inputStreamFactory = null;
}
/**
* A ctor for the 3 things browsers tell us about the uploaded file
* @param filename The remote source filename
* @param mimeType The mime type passed in by the browser
* @param bytes the raw data
*/
public FileTransfer(String filename, String mimeType, final byte[] bytes)
{
this.filename = filename;
this.mimeType = mimeType;
this.size = bytes.length;
this.outputStreamLoader = new OutputStreamLoader()
{
public void load(OutputStream out) throws IOException
{
CopyUtils.copy(bytes, out);
}
public void close() throws IOException
{
}
};
this.inputStreamFactory = null;
}
/**
* A ctor for the 3 things browsers tell us about the uploaded file
* @param filename The remote source filename
* @param mimeType The mime type passed in by the browser
* @param size The size of the file
* @param inputStreamFactory A means by which the data can be read
*/
public FileTransfer(String filename, String mimeType, long size, final InputStreamFactory inputStreamFactory)
{
this.filename = filename;
this.mimeType = mimeType;
this.size = size;
this.outputStreamLoader = null;
this.inputStreamFactory = inputStreamFactory;
}
/**
* A ctor for the 3 things browsers tell us about the uploaded file
* @param filename The remote source filename
* @param mimeType The mime type passed in by the browser
* @param size The size of the file
* @param in A means by which the data can be read.
*/
public FileTransfer(String filename, String mimeType, long size, final InputStream in)
{
this.filename = filename;
this.mimeType = mimeType;
this.size = size;
this.outputStreamLoader = null;
this.inputStreamFactory = new SimpleInputStreamFactory(in, true);
}
/**
* Returns the original filename in the client's file-system, as provided by
* the browser (or other client software).
* In most cases, this will be the base file name, without path information.
* However, some clients, such as the Opera browser, do include path
* information.
* @return The original filename in the client's file-system.
*/
public String getFilename()
{
return filename;
}
/**
* Returns the content type passed by the browser or null if not defined.
*/
public String getMimeType()
{
return mimeType;
}
/**
* Returns the size of the file passed by the browser or -1 if this is not
* known.
*/
public long getSize()
{
return size;
}
/**
* Returns an OutputStreamLoader that can be used to retrieve the contents
* of the file.
*/
public OutputStreamLoader getOutputStreamLoader()
{
if (outputStreamLoader != null)
{
return outputStreamLoader;
}
else
{
return new InputStreamFactoryOutputStreamLoader(inputStreamFactory);
}
}
/**
* Returns an {@link InputStream} that can be used to retrieve the contents
* of the file.
* {@link InputStreamFactory} is used place of direct access to an
* {@link InputStream} to ensure that resources are properly closed.
*/
public InputStream getInputStream() throws IOException
{
if (inputStreamFactory != null)
{
return inputStreamFactory.getInputStream();
}
else
{
return new OutputStreamLoaderInputStreamFactory(outputStreamLoader).getInputStream();
}
}
/**
* The remote source filename
*/
private final String filename;
/**
* The mime type passed in by the browser
*/
private final String mimeType;
/**
* The size of the file
*/
private final long size;
/**
* One of 2 means by which the data can be obtained
* @see #inputStreamFactory
*/
private final OutputStreamLoader outputStreamLoader;
/**
* One of 2 means by which the data can be obtained
* @see #outputStreamLoader
*/
private final InputStreamFactory inputStreamFactory;
}