ZipDownloadActionLink.java

/**
 * Copyright 2011 the original author or authors.
 *
 * 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.bricket.web.common;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.protocol.http.WicketURLEncoder;
import org.apache.wicket.request.target.resource.ResourceStreamRequestTarget;
import org.apache.wicket.util.file.File;
import org.apache.wicket.util.resource.IResourceStream;
import org.apache.wicket.util.resource.ZipResourceStream;
import org.apache.wicket.util.string.Strings;
import org.bricket.service.MessageException;
import org.odlabs.wiquery.ui.themes.UiIcon;

/**
 * @author Ingo Renner
 * @author Henning Teek
 */
public abstract class ZipDownloadActionLink extends AActionBricketLink {

    private final String fileName;

    public ZipDownloadActionLink(String fileName) {
        super(false);
        if (Strings.isEmpty(fileName)) {
            throw new IllegalArgumentException("fileName cannot be an empty string");
        }
        this.fileName = WicketURLEncoder.QUERY_INSTANCE.encode(fileName);
    }

    @Override
    protected UiIcon getIcon() {
        return UiIcon.DISK;
    }

    @Override
    public void onClick(AjaxRequestTarget target) {
        try {
            final File file = new File(getFile());
            final IResourceStream resourceStream = new ZipResourceStream(file, true);
            getRequestCycle().setRequestTarget(new ResourceStreamRequestTarget(resourceStream) {
                @Override
                public String getFileName() {
                    return fileName;
                }
            });
        } catch (MessageException e) {
            getSession().error(e.getMessage());
        }
    }

    public abstract java.io.File getFile() throws MessageException;
}