DownloadBehavior.java

/*
 * 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.cyclop.web.panels.queryeditor.export;

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;

/** @author Maciej Miklas */
abstract class DownloadBehavior extends AbstractAjaxBehavior {

	protected DownloadBehavior() {
	}

	public void initiateDownload(AjaxRequestTarget target) {
		String url = getCallbackUrl().toString();

		if (url.contains("?")) {
			url = url + "&antiCache=" + System.currentTimeMillis();
		} else {
			url = url + "?antiCache=" + System.currentTimeMillis();
		}

		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);
	}

	protected abstract String getFileName();

	protected abstract IResourceStream getResourceStream();
}