/
FileDownloadActionListener.java
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/
FileDownloadActionListener.java
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/**
* Copyright 2009-2018 PrimeTek.
*
* 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.primefaces.component.filedownload;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collections;
import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.component.StateHolder;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ActionEvent;
import javax.faces.event.ActionListener;
import org.primefaces.context.PrimeRequestContext;
import org.primefaces.model.StreamedContent;
import org.primefaces.util.ComponentUtils;
import org.primefaces.util.Constants;
public class FileDownloadActionListener implements ActionListener, StateHolder {
private ValueExpression value;
private ValueExpression contentDisposition;
private ValueExpression monitorKey;
public FileDownloadActionListener() {
}
public FileDownloadActionListener(ValueExpression value, ValueExpression contentDisposition, ValueExpression monitorKey) {
this.value = value;
this.contentDisposition = contentDisposition;
this.monitorKey = monitorKey;
}
@Override
public void processAction(ActionEvent actionEvent) throws AbortProcessingException {
FacesContext context = FacesContext.getCurrentInstance();
ELContext elContext = context.getELContext();
StreamedContent content = (StreamedContent) value.getValue(elContext);
if (content == null) {
return;
}
ExternalContext externalContext = context.getExternalContext();
String contentDispositionValue = contentDisposition != null ? (String) contentDisposition.getValue(elContext) : "attachment";
String monitorKeyValue = monitorKey != null ? "_" + (String) monitorKey.getValue(elContext) : "";
InputStream inputStream = null;
try {
externalContext.setResponseContentType(content.getContentType());
externalContext.setResponseHeader("Content-Disposition", ComponentUtils.createContentDisposition(contentDispositionValue, content.getName()));
externalContext.addResponseCookie(Constants.DOWNLOAD_COOKIE + monitorKeyValue, "true", Collections.<String, Object>emptyMap());
if (content.getContentLength() != null) {
externalContext.setResponseContentLength(content.getContentLength().intValue());
}
if (PrimeRequestContext.getCurrentInstance(context).isSecure()) {
externalContext.setResponseHeader("Cache-Control", "public");
externalContext.setResponseHeader("Pragma", "public");
}
byte[] buffer = new byte[2048];
int length;
inputStream = content.getStream();
OutputStream outputStream = externalContext.getResponseOutputStream();
while ((length = (inputStream.read(buffer))) != -1) {
outputStream.write(buffer, 0, length);
}
if (!externalContext.isResponseCommitted()) {
externalContext.setResponseStatus(200);
}
externalContext.responseFlushBuffer();
context.responseComplete();
}
catch (IOException e) {
throw new FacesException(e);
}
finally {
if (inputStream != null) {
try {
inputStream.close();
}
catch (IOException e) {
// ignore
}
}
}
}
@Override
public boolean isTransient() {
return false;
}
@Override
public void restoreState(FacesContext facesContext, Object state) {
Object values[] = (Object[]) state;
value = (ValueExpression) values[0];
contentDisposition = (ValueExpression) values[1];
monitorKey = (ValueExpression) values[2];
}
@Override
public Object saveState(FacesContext facesContext) {
Object values[] = new Object[3];
values[0] = value;
values[1] = contentDisposition;
values[2] = monitorKey;
return ((Object[]) values);
}
@Override
public void setTransient(boolean value) {
}
}