de.tudarmstadt.ukp.csniper.webapp.support.wicket.DownloadButton.java Source code

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/*******************************************************************************
 * Copyright 2013
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universitt Darmstadt
 * 
 * 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 de.tudarmstadt.ukp.csniper.webapp.support.wicket;

import java.io.File;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.apache.wicket.markup.html.form.Button;
import org.apache.wicket.model.IModel;
import org.apache.wicket.request.IRequestCycle;
import org.apache.wicket.util.encoding.UrlEncoder;
import org.apache.wicket.request.handler.resource.ResourceStreamRequestHandler;
import org.apache.wicket.request.resource.ContentDisposition;
import org.apache.wicket.util.resource.FileResourceStream;
import org.apache.wicket.util.resource.IResourceStream;

public class DownloadButton extends Button {
    private static final long serialVersionUID = 1L;
    private IModel<File> fileModel;
    private IModel<String> fileNameModel;
    private boolean deleteAfter;

    public DownloadButton(String aId, IModel<String> aButtonLabel, IModel<File> aFileModel,
            IModel<String> aFileName) {
        super(aId, aButtonLabel);
        fileModel = aFileModel;
        fileNameModel = aFileName;
        deleteAfter = false;
    }

    /**
     * Copied from DownloadLink
     */
    @Override
    public void onSubmit() {
        try {
            final File file = fileModel.getObject();

            String fileName = fileNameModel != null ? fileNameModel.getObject() : null;
            if (StringUtils.isEmpty(fileName)) {
                fileName = file.getName();
            }

            fileName = UrlEncoder.QUERY_INSTANCE.encode(fileName, getRequest().getCharset());

            IResourceStream resourceStream = new FileResourceStream(new org.apache.wicket.util.file.File(file));
            getRequestCycle().scheduleRequestHandlerAfterCurrent(new ResourceStreamRequestHandler(resourceStream) {
                @Override
                public void respond(IRequestCycle requestCycle) {
                    super.respond(requestCycle);

                    if (deleteAfter) {
                        FileUtils.deleteQuietly(file);
                    }
                }
            }.setFileName(fileName).setContentDisposition(ContentDisposition.ATTACHMENT));
        } catch (Exception e) {
            error("Unable to export: " + ExceptionUtils.getRootCauseMessage(e));
        }
    }

    public boolean getDeleteAfterDownload() {
        return deleteAfter;
    }

    public DownloadButton setDeleteAfterDownload(boolean doDeleteAfter) {
        deleteAfter = doDeleteAfter;
        return this;
    }
}