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package com.sun.jersey.core.impl.provider.entity;
import com.sun.jersey.core.provider.AbstractMessageReaderWriterProvider;
import com.sun.jersey.core.util.ReaderWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
/**
*
* @author [email protected]
*/
@Produces({"application/octet-stream", "*/*"})
@Consumes({"application/octet-stream", "*/*"})
public class DataSourceProvider extends AbstractMessageReaderWriterProvider {
/**
* Modified from javax.mail.util.ByteArrayDataSource
*
* A DataSource backed by a byte array. The byte array may be
* passed in directly, or may be initialized from an InputStream
* or a String.
*
* @since JavaMail 1.4
* @author John Mani
* @author Bill Shannon
* @author Max Spivak
*/
public static class ByteArrayDataSource implements DataSource {
private byte[] data;
private int len = -1;
private String type;
private String name = "";
static class DSByteArrayOutputStream extends ByteArrayOutputStream {
public byte[] getBuf() {
return buf;
}
public int getCount() {
return count;
}
}
public ByteArrayDataSource(InputStream is, String type) throws IOException {
DSByteArrayOutputStream os = new DSByteArrayOutputStream();
ReaderWriter.writeTo(is, os);
this.data = os.getBuf();
this.len = os.getCount();
/*
* ByteArrayOutputStream doubles the size of the buffer every time
* it needs to expand, which can waste a lot of memory in the worst
* case with large buffers. Check how much is wasted here and if
* it's too much, copy the data into a new buffer and allow the
* old buffer to be garbage collected.
*/
if (this.data.length - this.len > 256*1024) {
this.data = os.toByteArray();
this.len = this.data.length; // should be the same
}
this.type = type;
}
public InputStream getInputStream() throws IOException {
if (data == null)
throw new IOException("no data");
if (len < 0)
len = data.length;
return new ByteArrayInputStream(data, 0, len);
}
public OutputStream getOutputStream() throws IOException {
throw new IOException("cannot do this");
}
public String getContentType() {
return type;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
public DataSourceProvider() {
Class c = DataSource.class;
}
public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return DataSource.class == type;
}
public DataSource readFrom(
Class type,
Type genericType,
Annotation annotations[],
MediaType mediaType,
MultivaluedMap httpHeaders,
InputStream entityStream) throws IOException {
ByteArrayDataSource ds = new ByteArrayDataSource(entityStream,
(mediaType == null) ? null : mediaType.toString());
return ds;
}
public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
return DataSource.class.isAssignableFrom(type);
}
public void writeTo(
DataSource t,
Class type,
Type genericType,
Annotation annotations[],
MediaType mediaType,
MultivaluedMap httpHeaders,
OutputStream entityStream) throws IOException {
InputStream in = t.getInputStream();
try {
writeTo(in, entityStream);
} finally {
in.close();
}
}
}