edu.umn.msi.tropix.webgui.client.widgets.GWTDownloadFormPanel.java Source code

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/*******************************************************************************
 * Copyright 2009 Regents of the University of Minnesota. All rights
 * reserved.
 * Copyright 2009 Mayo Foundation for Medical Education and Research.
 * All rights reserved.
 *
 * This program is made available under the terms of the Eclipse
 * Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 *
 * 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 INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OR CONDITIONS
 * OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A
 * PARTICULAR PURPOSE.  See the License for the specific language
 * governing permissions and limitations under the License.
 *
 * Contributors:
 * Minnesota Supercomputing Institute - initial API and implementation
 ******************************************************************************/

package edu.umn.msi.tropix.webgui.client.widgets;

import java.util.HashMap;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.Hidden;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

public class GWTDownloadFormPanel extends FormPanel implements Command {
    public static final String DOWNLOAD_TYPE_SIMPLE = "simple";
    private Hidden type = new Hidden("downloadType");
    private Hidden id = new Hidden("id");
    private HashMap<String, Hidden> parameters = new HashMap<String, Hidden>();
    private String filename;
    private VerticalPanel vp = new VerticalPanel();

    public GWTDownloadFormPanel(final String... extraParameters) {
        this(true, extraParameters);
    }

    public GWTDownloadFormPanel(final boolean init, final String... extraParameters) {
        makeHidden();
        if (init) {
            this.init(extraParameters);
        }
    }

    public void addToPanel(final Widget widget) {
        this.vp.add(this.vp);
    }

    // I want this to be a hidden element on the page, but it seems to need to
    // have a non-negative width and height to work properly.
    private void makeHidden() {
        setWidth("1px");
        setHeight("1px");
    }

    public void init(final String[] extraParameters) {
        // setMethod(FormMethod.POST);
        this.setMethod(FormPanel.METHOD_POST);
        // setEncoding(Encoding.NORMAL);
        this.setEncoding(FormPanel.ENCODING_URLENCODED);

        if (extraParameters != null) {
            for (final String extraParameter : extraParameters) {
                addExtraParameter(extraParameter);
            }
        }

        try {
            this.vp.add(this.type);
            this.vp.add(this.id);
            this.setWidget(this.vp);
        } catch (final Exception e) {
            e.printStackTrace();
        }
        this.parameters.put("downloadType", this.type);
        this.parameters.put("id", this.id);

        this.setType(GWTDownloadFormPanel.DOWNLOAD_TYPE_SIMPLE);
    }

    private void addExtraParameter(final String extraParameter) {
        final Hidden item = new Hidden(extraParameter);
        this.vp.add(item);
        this.parameters.put(extraParameter, item);
    }

    public void setParameter(final String parameterName, final Object parameterValue) {
        if (!parameters.containsKey(parameterName)) {
            addExtraParameter(parameterName);
        }
        final Hidden hidden = parameters.get(parameterName);
        hidden.setValue(parameterValue.toString());
    }

    protected void setAction() {
        this.setAction(GWT.getHostPageBaseURL() + "download/" + this.getSanitizedFilename());
    }

    private String getSanitizedFilename() {
        // Remove non word characters/non periods from file name to ensure there are
        // no problems with
        // the resulting url.
        return this.filename.replaceAll("[^\\w\\.]", "_");
    }

    public void setId(final String id) {
        // setValue("id",id);
        this.setParameter("id", id);
    }

    public void setType(final String downloadType) {
        this.setParameter("downloadType", downloadType);
    }

    public void setFilename(final String filename) {
        this.filename = filename;
        this.setAction();
    }

    public void execute() {
        GWTDownloadFormPanel.this.submit();
    }
}