n3phele.client.widgets.UploadCommandPanel.java Source code

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Here is the source code for n3phele.client.widgets.UploadCommandPanel.java

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/**
 * @author Nigel Cook
 *
 * (C) Copyright 2010-2012. Nigel Cook. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Licensed under the terms described in LICENSE file that accompanied this code, (the "License"); you may not use this file
 * except in compliance with the License. 
 * 
 *  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 n3phele.client.widgets;

import n3phele.client.N3phele;
import n3phele.client.presenter.CommandListActivity;

import com.google.gwt.cell.client.Cell;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.cellview.client.CellWidget;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.FileUpload;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.InlineHTML;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.PushButton;

public class UploadCommandPanel extends FormPanel {
    private static UploadCommandPanel instance = null;
    private PopupPanel uploadPopup;
    private FlexTable table;
    private HorizontalPanel header;
    private PushButton quitWidget;
    private FlowPanel flow;

    private Button upload;
    private FileUpload fileUpload;
    private boolean cancelled = true;

    protected UploadCommandPanel() {
        this.setWidth("500px");
        flow = new FlowPanel();
        this.add(flow);
        this.addStyleName(N3phele.n3pheleResource.css().workspacePanel());
        Cell<MenuItem> cell = new IconTextCell<MenuItem>(32, 32);
        header = new HorizontalPanel();
        header.setWidth("100%");
        header.addStyleName(N3phele.n3pheleResource.css().workspacePanelHeader());
        header.add(new CellWidget<MenuItem>(cell,
                new MenuItem(N3phele.n3pheleResource.uploadIcon(), "Command Definition Import", null)));
        flow.add(header);
        quitWidget = new PushButton(new Image(N3phele.n3pheleResource.dialog_close()), new ClickHandler() {
            @Override
            public void onClick(ClickEvent event) {
                cancelled = true;
                UploadCommandPanel.this.uploadPopup.hide();
            }
        });

        quitWidget.setWidth(N3phele.n3pheleResource.dialog_close().getWidth() + 4 + "px");
        quitWidget.setHeight(N3phele.n3pheleResource.dialog_close().getHeight() + 4 + "px");

        header.add(quitWidget);
        header.setCellHorizontalAlignment(quitWidget, HorizontalPanel.ALIGN_RIGHT);
        header.setCellVerticalAlignment(quitWidget, HorizontalPanel.ALIGN_TOP);
        this.setEncoding(FormPanel.ENCODING_MULTIPART);
        this.setMethod(FormPanel.METHOD_POST);
        this.setAction("/resources/command/import");

        table = new FlexTable();
        flow.add(table);

        table.setWidth("490px");
        fileUpload = new FileUpload();
        fileUpload.setName("file");
        fileUpload.setWidth("100%");
        fileUpload.addChangeHandler(new ChangeHandler() {

            @Override
            public void onChange(ChangeEvent event) {
                upload.setEnabled(isValid());
            }
        });

        InlineHTML step1Text = new InlineHTML("Choose command definition xml file");
        step1Text.setStyleName(N3phele.n3pheleResource.css().repoContentElementName());
        table.setWidget(0, 1, step1Text);
        table.setWidget(0, 2, fileUpload);

        upload = new Button("import");
        upload.addClickHandler(new ClickHandler() {

            @Override
            public void onClick(ClickEvent event) {
                if (isValid()) {
                    GWT.log("submiting ...");
                    submit();
                }
                upload.setEnabled(false);
            }
        });
        table.setWidget(2, 3, upload);

        this.addSubmitHandler(new SubmitHandler() {
            @Override
            public void onSubmit(SubmitEvent event) {
                GWT.log("submit ..." + event.toString());

            }
        });
        this.addSubmitCompleteHandler(new SubmitCompleteHandler() {

            @Override
            public void onSubmitComplete(SubmitCompleteEvent event) {
                cancelled = false;
                UploadCommandPanel.this.uploadPopup.hide();
                Window.alert(event.getResults() == null ? "An error occurred"
                        : event.getResults().replace("<PRE>", "").replace("</PRE>", ""));
            }
        });
        flow.add(upload);

        table.getFlexCellFormatter().setColSpan(0, 2, 2);
        table.getFlexCellFormatter().setWidth(0, 0, "10%");
        table.getFlexCellFormatter().setWidth(0, 2, "70%");
    }

    /**
     * @param node
     * @param uploadPopup
     * @return
     */
    public static UploadCommandPanel getInstance(PopupPanel uploadPopup, CommandListActivity presenter) {
        if (instance == null)
            instance = new UploadCommandPanel();
        instance.uploadPopup = uploadPopup;

        instance.upload.setEnabled(instance.isValid());
        instance.cancelled = true;
        return instance;
    }

    public boolean isCancelled() {
        return this.cancelled;
    }

    private boolean isValid() {
        return this.fileUpload.getFilename() != null && this.fileUpload.getFilename().length() != 0
                && this.fileUpload.getFilename().toLowerCase().endsWith(".json");
    }
}