/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.openmeetings.web.util;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.behavior.AbstractAjaxBehavior;
import org.apache.wicket.request.handler.resource.ResourceStreamRequestHandler;
import org.apache.wicket.request.resource.ContentDisposition;
import org.apache.wicket.util.resource.IResourceStream;
/**
* see: <a href="https://cwiki.apache.org/confluence/display/WICKET/AJAX+update+and+file+download+in+one+blow">
* https://cwiki.apache.org/confluence/display/WICKET/AJAX+update+and+file+download+in+one+blow</href>
*
*/
public class AjaxDownload extends AbstractAjaxBehavior {
private static final long serialVersionUID = 1L;
private boolean addAntiCache;
private String fileName;
private IResourceStream resourceStream;
public AjaxDownload() {
this(true);
}
public AjaxDownload(boolean addAntiCache) {
super();
this.addAntiCache = addAntiCache;
}
/**
* Call this method to initiate the download.
*/
public void initiate(AjaxRequestTarget target) {
String url = getCallbackUrl().toString();
if (addAntiCache) {
url = url + (url.contains("?") ? "&" : "?");
url = url + "antiCache=" + System.currentTimeMillis();
}
// the timeout is needed to let Wicket release the channel
target.appendJavaScript("setTimeout(\"window.location.href='" + url
+ "'\", 100);");
}
public void onRequest() {
ResourceStreamRequestHandler handler = new ResourceStreamRequestHandler(
getResourceStream(), getFileName());
handler.setContentDisposition(ContentDisposition.ATTACHMENT);
getComponent().getRequestCycle().scheduleRequestHandlerAfterCurrent(
handler);
}
/**
* Override this method for a file name which will let the browser prompt
* with a save/open dialog.
*
* @see ResourceStreamRequestTarget#getFileName()
*/
protected String getFileName() {
return this.fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
/**
* Hook method providing the actual resource stream.
*/
protected IResourceStream getResourceStream() {
return resourceStream;
}
public void setResourceStream(IResourceStream resourceStream) {
this.resourceStream = resourceStream;
}
}