viewcontentprovider.java

J2EE eclipse 下开发数据库一个插件

/*
 * Created on 2003-5-16
 *
 */
package com.tanghan.plugin.dbviews.elements;

import java.util.ResourceBundle;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

import com.tanghan.plugin.TanghanPlugin;

/**
 * 用来为视图提供内容
 * @author Jerry Tang
 * @version v0.1.0
 * @copyright  (C) 2003 Tanghan工作组
 *  */
public class ViewContentProvider
	implements IStructuredContentProvider, ITreeContentProvider {
	/**资源文件*/
	private static ResourceBundle res =
		TanghanPlugin.getDefault().getResourceBundle();

	private TreeParent invisibleRoot;

	public void inputChanged(Viewer v, Object oldInput, Object newInput) {
	}
	public void dispose() {
	}
	public Object[] getElements(Object parent) {
		if (parent.equals(ResourcesPlugin.getWorkspace())) {
			if (invisibleRoot == null)
				initialize();
			return getChildren(invisibleRoot);
		}
		return getChildren(parent);
	}
	public Object getParent(Object child) {
		if (child instanceof TreeObject) {
			return ((TreeObject) child).getParent();
		}
		return null;
	}
	public Object[] getChildren(Object parent) {
		if (parent instanceof TreeParent) {
			return ((TreeParent) parent).getChildren();
		}
		return new Object[0];
	}
	public boolean hasChildren(Object parent) {
		if (parent instanceof TreeParent)
			return ((TreeParent) parent).hasChildren();
		return false;
	}
	/*
	 * We will set up a dummy model to initialize tree heararchy.
	 * In a real code, you will connect to a real model and
	 * expose its hierarchy.
	 */
	private void initialize() {
		//TO DO 修改添加数据库的方式 已完成
		invisibleRoot = new TreeParent("", TreeObject.DEFAULT_ITEM);
		TreeParent root =
			new TreeParent(
				res.getString("Tree.View.Database"),
				TreeObject.DATABASE_NOTE_ITEM);
		invisibleRoot.addChild(root);
		root =
			new TreeParent(
				res.getString("Tree.View.Drivers"),
				TreeObject.DRIVERS_NOTE_ITEM);
		invisibleRoot.addChild(root);
	}
}