org.openelis.ui.widget.fileupload.FileLoad.java Source code

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Here is the source code for org.openelis.ui.widget.fileupload.FileLoad.java

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/**
 * Exhibit A - UIRF Open-source Based Public Software License.
 * 
 * The contents of this file are subject to the UIRF Open-source Based Public
 * Software License(the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * openelis.uhl.uiowa.edu
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 * 
 * The Original Code is OpenELIS code.
 * 
 * The Initial Developer of the Original Code is The University of Iowa.
 * Portions created by The University of Iowa are Copyright 2006-2008. All
 * Rights Reserved.
 * 
 * Contributor(s): ______________________________________.
 * 
 * Alternatively, the contents of this file marked "Separately-Licensed" may be
 * used under the terms of a UIRF Software license ("UIRF Software License"), in
 * which case the provisions of a UIRF Software License are applicable instead
 * of those above.
 */
package org.openelis.ui.widget.fileupload;

import java.util.Iterator;

import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.AbsolutePanel;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteHandler;
import com.google.gwt.user.client.ui.FormPanel.SubmitHandler;
import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.Hidden;
import com.google.gwt.user.client.ui.ResizeComposite;
import com.google.gwt.user.client.ui.Widget;

/**
 * Class has been deprecatead by FileInput. 
 * 
 * This class will create a HTML form that will allow upload of a single file.  A widget is used
 * as the diplay to open the browser file dialog.  
 *
 */
@Deprecated
public class FileLoad extends ResizeComposite implements HasWidgets {

    protected FileLoadButton upload;
    protected FormPanel form;
    protected AbsolutePanel panel;
    protected Hidden service, method;

    public FileLoad() {
        form = new FormPanel();
        form.setEncoding(FormPanel.ENCODING_MULTIPART);
        form.setMethod(FormPanel.METHOD_POST);

        upload = new FileLoadButton();

        // Submit form to server once user has chosen a file
        upload.addChangeHandler(new ChangeHandler() {
            @Override
            public void onChange(ChangeEvent event) {
                form.submit();
            }
        });
        upload.setName("file");

        // Hidden fields in form to define service and method to call on upload
        service = new Hidden("service");
        method = new Hidden("method");

        panel = new AbsolutePanel();
        panel.add(upload);
        panel.add(service);
        panel.add(method);
        form.add(panel);
        initWidget(form);
    }

    /**
     * Adds a handler that will be called back om form submission 
     */
    public HandlerRegistration addSubmitHandler(SubmitHandler handler) {
        return form.addSubmitHandler(handler);
    }

    /**
     * Adds a handler that will be called back when file upload is completed
     */
    public HandlerRegistration addSubmitCompleteHandler(SubmitCompleteHandler handler) {
        return form.addSubmitCompleteHandler(handler);
    }

    /**
     * Sets the action of the form that represents the path of the servlet that should 
     * be called on submission
     */
    public void setAction(String action) {
        form.setAction(action);
    }

    /**
     * Sets a class name that will be called using reflection from the FileUploadServlet when
     * the file is received on the server.   
     */
    public void setService(String service) {
        this.service.setValue(service);
    }

    /**
     * Method called in the reflected service class to process the uploaded file.
     */
    public void setMethod(String method) {
        this.method.setValue(method);
    }

    /**
     * Sets the widget to be used for display and to open the file dialog in the browser.
     */
    public void setWidget(Widget widget) {
        upload.setButton(widget);
    }

    /**
     * Sets the text of the default upload button
     * @param text
     */
    public void setText(String text) {
        upload.setText(text);
    }

    @Override
    public void add(Widget w) {
        setWidget(w);

    }

    @Override
    public void clear() {

    }

    @Override
    public Iterator<Widget> iterator() {
        return null;
    }

    @Override
    public boolean remove(Widget w) {
        return false;
    }

    @Override
    public void onResize() {
        super.onResize();
        upload.onResize();
    }

    @Override
    public void setWidth(String width) {
        upload.setWidth(width);
    }

    @Override
    public void setHeight(String height) {
        upload.setHeight(height);
    }

}