com.qut.middleware.esoemanager.client.ui.panels.MetadataPanel.java Source code

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Here is the source code for com.qut.middleware.esoemanager.client.ui.panels.MetadataPanel.java

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/* Copyright 2008, Queensland University of Technology
 * 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 com.qut.middleware.esoemanager.client.ui.panels;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
import com.qut.gwtuilib.client.eventdriven.eventmgr.EventController;
import com.qut.gwtuilib.client.eventdriven.events.MessageEvent;
import com.qut.gwtuilib.client.input.StyledButton;
import com.qut.middleware.esoemanager.client.CSSConstants;
import com.qut.middleware.esoemanager.client.EsoeManager;
import com.qut.middleware.esoemanager.client.EsoeManagerConstants;
import com.qut.middleware.esoemanager.client.events.EventConstants;

public class MetadataPanel extends VerticalPanel {
    private String esoeID;
    private SimplePanel codePanel;
    private Element elem;

    private JavaScriptObject codeMirror;
    private String basePath;

    public MetadataPanel(String esoeID) {
        this.esoeID = esoeID;
        this.basePath = EsoeManager.basePath;

        this.createInterface();

        EsoeManager.contentService.getMetadataXML(new MetadataRetrievalHandler());
    }

    private void createInterface() {
        this.codePanel = new SimplePanel();
        this.codePanel.addStyleName(CSSConstants.metadataPanel);

        this.elem = this.codePanel.getElement();

        HorizontalPanel controls = new HorizontalPanel();
        controls.setSpacing(5);

        StyledButton reloadMetadata = new StyledButton("toggle", "Refresh");
        controls.add(reloadMetadata);

        reloadMetadata.addClickListener(new ClickListener() {
            public void onClick(Widget sender) {
                EsoeManager.contentService.getMetadataXML(new MetadataRetrievalHandler());
            }
        });

        this.add(controls);
        this.add(this.codePanel);
    }

    public String getXMLMarkup() {
        return this.getCode();
    }

    private class MetadataRetrievalHandler implements AsyncCallback {
        public void onFailure(Throwable caught) {
            EventController.executeEvent(new MessageEvent(EventConstants.userMessage, EsoeManagerConstants.areaID,
                    MessageEvent.error,
                    "Unable to retrieve metadata XML please contact a system administrator. Server response: "
                            + caught.getLocalizedMessage()));
        }

        public void onSuccess(Object result) {
            String content = (String) result;

            /* Create on first access can take some time to be ready */
            if (MetadataPanel.this.codeMirror == null) {
                MetadataPanel.this.codeMirror = MetadataPanel.this.configureCoreMirror(content,
                        MetadataPanel.this.basePath);
            } else {
                MetadataPanel.this.setCode(content);
            }
        }
    }

    /* JS native below this point */
    /**
     * Returns the current content of the editor, as a string.
     */
    public native String getCode() /*-{
                                   return this.@com.qut.middleware.esoemanager.client.ui.policy.PolicyXMLUI::codeMirror.getCode();
                                   }-*/;

    /**
     * Takes a single string argument, and replaces the current content of the editor with that value.
     */
    public native void setCode(String content) /*-{
                                               this.@com.qut.middleware.esoemanager.client.ui.policy.PolicyXMLUI::codeMirror.setCode(content);
                                               }-*/;

    /**
     * Initial component configuration
     */
    private native JavaScriptObject configureCoreMirror(String content, String basePath) /*-{
                                                                                         var codeMirror = new $wnd.CodeMirror(this.@com.qut.middleware.esoemanager.client.ui.panels.MetadataPanel::elem, {
                                                                                         height: "900px",
                                                                                         width: "795px",
                                                                                         parserfile: "parsexml.js",
                                                                                         stylesheet: basePath + "codemirror/css/xmlcolors.css",
                                                                                         path: basePath + "codemirror/js/",
                                                                                         continuousScanning: 500,
                                                                                         content: content
                                                                                         });
                                                                                             
                                                                                         return codeMirror;
                                                                                         }-*/;
}