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org.jboss.resteasy.plugins.providers.DataSourceProvider Maven / Gradle / Ivy
/**
*
*/
package org.jboss.resteasy.plugins.providers;
import org.jboss.resteasy.util.NoContent;
import javax.xml.transform.stream.StreamSource;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.SequenceInputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.activation.DataSource;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.Provider;
/**
* @author Ryan J. McDonough
* @version $Revision:$
*/
@Provider
@Consumes("*/*")
@Produces("*/*")
public class DataSourceProvider extends AbstractEntityProvider
{
protected static class SequencedDataSource implements DataSource
{
private final byte[] byteBuffer;
private final int byteBufferOffset;
private final int byteBufferLength;
private final File tempFile;
private final String type;
protected SequencedDataSource(byte[] byteBuffer, int byteBufferOffset,
int byteBufferLength, File tempFile, String type)
{
super();
this.byteBuffer = byteBuffer;
this.byteBufferOffset = byteBufferOffset;
this.byteBufferLength = byteBufferLength;
this.tempFile = tempFile;
this.type = type;
}
@Override
public String getContentType()
{
return type;
}
@Override
public InputStream getInputStream() throws IOException
{
InputStream bis = new ByteArrayInputStream(byteBuffer, byteBufferOffset, byteBufferLength);
if (tempFile == null)
return bis;
InputStream fis = new FileInputStream(tempFile);
return new SequenceInputStream(bis, fis) {
@Override
public int read(byte[] b, int off, int len) throws IOException
{
int r = super.read(b, off, len);
if(r == -1)
{
deleteTempFile();
}
return r;
}
@Override
public int read() throws IOException
{
int r = super.read();
if(r == -1)
{
deleteTempFile();
}
return r;
}
};
}
private void deleteTempFile()
{
if(tempFile.exists())
{
tempFile.delete();
}
}
@Override
public String getName()
{
return "";
}
@Override
public OutputStream getOutputStream() throws IOException
{
throw new IOException("No output stream allowed");
}
}
/**
* @param in
* @param mediaType
* @return
* @throws IOException
*/
public static DataSource readDataSource(final InputStream in, final MediaType mediaType) throws IOException
{
byte[] memoryBuffer = new byte[4096];
int readCount = in.read(memoryBuffer, 0, memoryBuffer.length);
File tempFile = null;
if (readCount > 0)
{
byte[] buffer = new byte[4096];
int count = in.read(buffer, 0, buffer.length);
if (count > -1) {
tempFile = File.createTempFile("resteasy-provider-datasource", null);
tempFile.deleteOnExit();
FileOutputStream fos = new FileOutputStream(tempFile);
fos.write(buffer, 0, count);
try
{
ProviderHelper.writeTo(in, fos);
}
finally
{
fos.close();
}
}
}
if (readCount == -1)
readCount = 0;
return new SequencedDataSource(memoryBuffer, 0, readCount, tempFile, mediaType.toString());
}
/**
* FIXME Comment this
*
* @param type
* @param genericType
* @param annotations
* @return
* @see javax.ws.rs.ext.MessageBodyReader
*/
@Override
public boolean isReadable(Class type,
Type genericType,
Annotation[] annotations, MediaType mediaType)
{
return DataSource.class.isAssignableFrom(type);
}
/**
* FIXME Comment this
*
* @param type
* @param genericType
* @param annotations
* @param mediaType
* @param httpHeaders
* @param entityStream
* @return
* @throws IOException
* @throws WebApplicationException
* @see @see javax.ws.rs.ext.MessageBodyReader#readFrom(java.lang.Class, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap, java.io.InputStream)
*/
@Override
public DataSource readFrom(Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap httpHeaders,
InputStream entityStream) throws IOException
{
if (NoContent.isContentLengthZero(httpHeaders)) return readDataSource(new ByteArrayInputStream(new byte[0]), mediaType);
return readDataSource(entityStream, mediaType);
}
/**
* FIXME Comment this
*
* @param type
* @param genericType
* @param annotations
* @return
* @see @see javax.ws.rs.ext.MessageBodyWriter#isWriteable(java.lang.Class, java.lang.reflect.Type, java.lang.annotation.Annotation[])
*/
@Override
public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType)
{
return DataSource.class.isAssignableFrom(type);
}
/**
* FIXME Comment this
*
* @param dataSource
* @param type
* @param genericType
* @param annotations
* @param mediaType
* @param httpHeaders
* @param entityStream
* @throws IOException
* @throws WebApplicationException
* @see @see javax.ws.rs.ext.MessageBodyWriter#writeTo(java.lang.Object, java.lang.Class, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap, java.io.OutputStream)
*/
@Override
public void writeTo(DataSource dataSource,
Class type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap httpHeaders,
OutputStream entityStream) throws IOException
{
InputStream in = dataSource.getInputStream();
try
{
ProviderHelper.writeTo(in, entityStream);
}
finally
{
in.close();
}
}
}
