org.isisaddons.wicket.excel.cpt.ui.ExcelFileDownloadLink.java Source code

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Here is the source code for org.isisaddons.wicket.excel.cpt.ui.ExcelFileDownloadLink.java

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/*
 *  Copyright 2013~2014 Dan Haywood
 *
 *  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.isisaddons.wicket.excel.cpt.ui;

import java.io.File;

import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.link.DownloadLink;
import org.apache.wicket.model.LoadableDetachableModel;
import org.apache.wicket.request.IRequestCycle;
import org.apache.wicket.request.handler.resource.ResourceStreamRequestHandler;
import org.apache.wicket.request.resource.ContentDisposition;
import org.apache.wicket.util.encoding.UrlEncoder;
import org.apache.wicket.util.file.Files;
import org.apache.wicket.util.resource.FileResourceStream;
import org.apache.wicket.util.resource.IResourceStream;

class ExcelFileDownloadLink extends DownloadLink {

    private static final long serialVersionUID = 1L;

    private final String xlsxFileName;

    public ExcelFileDownloadLink(String id, LoadableDetachableModel<File> model, String xlsxFileName) {
        super(id, model, xlsxFileName);
        this.xlsxFileName = xlsxFileName;
    }

    @Override
    public void onClick() {
        final File file = getModelObject();
        if (file == null) {
            throw new IllegalStateException(getClass().getName() + " failed to retrieve a File object from model");
        }

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

        final IResourceStream resourceStream = new FileResourceStream(new org.apache.wicket.util.file.File(file)) {

            private static final long serialVersionUID = 1L;

            @Override
            public String getContentType() {
                return "application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml";
            }
        };

        getRequestCycle().scheduleRequestHandlerAfterCurrent(new ResourceStreamRequestHandler(resourceStream) {
            @Override
            public void respond(IRequestCycle requestCycle) {
                super.respond(requestCycle);
                Files.remove(file);
            }
        }.setFileName(fileName).setContentDisposition(ContentDisposition.ATTACHMENT));
    }

    @Override
    protected void onComponentTag(ComponentTag tag) {
        super.onComponentTag(tag);
        tag.put("download", (String) null);
    }

}