sourceediting/plugins/org.eclipse.wst.xml.vex.ui/src/org/eclipse/wst/xml/vex/ui/internal/config/ConfigurationView.java

/*******************************************************************************
 * Copyright (c) 2004, 2008 John Krasnay and others.
 * All rights reserved. This program and the accompanying materials
 * are 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
 * 
 * Contributors:
 *     John Krasnay - initial API and implementation
 *     Igor Jacy Lino Campista - Java 5 warnings fixed (bug 311325)
 *******************************************************************************/
package org.eclipse.wst.xml.vex.ui.internal.config;

import java.util.Collections;
import java.util.List;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.ui.part.ViewPart;

/**
 * View showing all configuration items defined in Vex.
 */
public class ConfigurationView extends ViewPart {

	public void createPartControl(Composite parent) {

		this.parentControl = parent;

		ConfigurationRegistry.INSTANCE.addConfigListener(this.configListener);
		if (ConfigurationRegistry.INSTANCE.isLoaded()) {
			this.createTreeViewer();
		} else {
			this.loadingLabel = new Label(parent, SWT.NONE);
			this.loadingLabel.setText(Messages
					.getString("ConfigurationView.loading")); //$NON-NLS-1$
		}

	}

	public void dispose() {
		super.dispose();
		ConfigurationRegistry.INSTANCE.removeConfigListener(this.configListener);
	}

	public void setFocus() {
		if (this.treeViewer != null) {
			this.treeViewer.getTree().setFocus();
		}
	}

	// ===================================================== PRIVATE

	private Composite parentControl;

	private Label loadingLabel;

	private TreeViewer treeViewer;

	private void createTreeViewer() {
		this.treeViewer = new TreeViewer(this.parentControl, SWT.SINGLE);
		this.treeViewer.setContentProvider(new ContentProvider());
		this.treeViewer.setLabelProvider(new MyLabelProvider());
		this.treeViewer.setAutoExpandLevel(2);
		this.treeViewer.setInput(ConfigurationRegistry.INSTANCE);
	}

	private static class ContentProvider implements ITreeContentProvider {

		public Object[] getChildren(Object parentElement) {
			if (parentElement instanceof IConfigItemFactory) {
				IConfigItemFactory factory = (IConfigItemFactory) parentElement;
				List<ConfigItem> items = ConfigurationRegistry.INSTANCE.getAllConfigItems(
						factory.getExtensionPointId());
				Collections.sort(items);
				return items.toArray();
			} else {
				return null;
			}
		}

		public Object getParent(Object element) {
			if (element instanceof ConfigItem) {
				ConfigItem item = (ConfigItem) element;
				return ConfigurationRegistry.INSTANCE.getConfigItemFactory(
						item.getExtensionPointId());
			} else {
				return ConfigurationRegistry.INSTANCE;
			}
		}

		public boolean hasChildren(Object element) {
			return element instanceof IConfigItemFactory;
		}

		public Object[] getElements(Object inputElement) {
			return ConfigurationRegistry.INSTANCE.getAllConfigItemFactories();
		}

		public void dispose() {
		}

		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		}

	}

	private static class MyLabelProvider extends LabelProvider {

		public String getText(Object element) {
			if (element instanceof IConfigItemFactory) {
				return ((IConfigItemFactory) element).getPluralName();
			} else {
				return ((ConfigItem) element).getName();
			}
		}
	}

	private IConfigListener configListener = new IConfigListener() {
		public void configChanged(ConfigEvent e) {
			treeViewer.refresh();
		}

		public void configLoaded(ConfigEvent e) {
			loadingLabel.dispose();
			createTreeViewer();
			parentControl.layout();
		}
	};
}