br.com.caelum.vraptor.observer.download.InputStreamDownload Maven / Gradle / Ivy
/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
* All rights reserved.
*
* 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 br.com.caelum.vraptor.observer.download;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.enterprise.inject.Vetoed;
import javax.servlet.http.HttpServletResponse;
import com.google.common.io.ByteStreams;
/**
* Handles download by reading from a input stream byte by byte.
*
* @author filipesabella
* @author Paulo Silveira
*
* @see ByteArrayDownload
* @see FileDownload
*/
@Vetoed
public class InputStreamDownload implements Download {
private final InputStream stream;
private final String contentType;
private final String fileName;
private final boolean doDownload;
private final long size;
public InputStreamDownload(InputStream input, String contentType, String fileName) {
this(input, contentType, fileName, false, 0);
}
public InputStreamDownload(InputStream input, String contentType, String fileName, boolean doDownload, long size) {
this.stream = input;
this.size = size;
this.contentType = contentType;
this.fileName = fileName;
this.doDownload = doDownload;
}
@Override
public void write(HttpServletResponse response) throws IOException {
writeDetails(response);
OutputStream out = response.getOutputStream();
ByteStreams.copy(stream, out);
}
void writeDetails(HttpServletResponse response) {
if (contentType != null) {
String contentDisposition = String.format("%s; filename=%s", doDownload ? "attachment" : "inline", fileName);
response.setHeader("Content-disposition", contentDisposition);
response.setHeader("Content-type", contentType);
}
if (size > 0) {
response.setHeader("Content-Length", Long.toString(size));
}
}
}