package org.jboss.resteasy.plugins.providers;

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.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import org.jboss.resteasy.util.MediaTypeHelper;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

Author:Bill Burke
Version:$Revision: 1 $
/** * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a> * @version $Revision: 1 $ */
@Provider @Produces("*/*") public class FileRangeWriter implements MessageBodyWriter<FileRange> { @Override public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) { return type.equals(FileRange.class) && !MediaTypeHelper.isBlacklisted(mediaType); } @Override public long getSize(FileRange fileRange, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) { return -1; } @Override public void writeTo(FileRange fileRange, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException { long fileSize = fileRange.getFile().length(); String contentRange = "bytes " + fileRange.getBegin() + "-" + fileRange.getEnd() + "/" + fileSize; long length = (fileRange.getEnd() - fileRange.getBegin()) + 1; httpHeaders.putSingle("Content-Range", contentRange); httpHeaders.putSingle("Content-Length", length); FileInputStream fis = new FileInputStream(fileRange.getFile()); try { if (fileRange.getBegin() > 0) { fis.getChannel().position(fileRange.getBegin()); } final byte[] buf = new byte[2048]; while (length > 0) { int len = 2048 > length ? (int)length : 2048; int read = fis.read(buf, 0, len); if (read == -1) { break; } entityStream.write(buf, 0, read); length -= len; } } finally { fis.close(); } } }