import org.eclipse.jface.viewers.ITreePathContentProvider; //导入依赖的package包/类
private boolean hasUnfilteredChild(TreeViewer viewer, TreePath parentPath, Object element) {
	TreePath elementPath = parentPath.createChildPath(element);
	IContentProvider contentProvider = viewer.getContentProvider();
	Object[] children = contentProvider instanceof ITreePathContentProvider
			? ((ITreePathContentProvider) contentProvider).getChildren(elementPath)
			: ((ITreeContentProvider) contentProvider).getChildren(element);

	/* avoid NPE + guard close */
	if (children == null || children.length == 0) {
		return false;
	}
	for (int i = 0; i < children.length; i++) {
		if (selectTreePath(viewer, elementPath, children[i])) {
			return true;
		}
	}
	return false;
}
 

import org.eclipse.jface.viewers.ITreePathContentProvider; //导入依赖的package包/类
private boolean hasUnfilteredChild(TreeViewer viewer, TreePath parentPath, Object element) {
	TreePath elementPath = parentPath.createChildPath(element);
	IContentProvider contentProvider = viewer.getContentProvider();
	Object[] children = contentProvider instanceof ITreePathContentProvider
			? ((ITreePathContentProvider) contentProvider).getChildren(elementPath)
			: ((ITreeContentProvider) contentProvider).getChildren(element);

	/* avoid NPE + guard close */
	if (children == null || children.length == 0) {
		return false;
	}

	for (int i = 0; i < children.length; i++) {
		if (selectTreePath(viewer, elementPath, children[i])) {
			return true;
		}
	}
	return false;
}
 

import org.eclipse.jface.viewers.ITreePathContentProvider; //导入依赖的package包/类
/**
 * <p>
 * Gallery expects contents to have exactly 2 levels of hierarchy, with groups as the root elements and image
 * thumbnails as direct children of the groups. This method accepts ITreeContentProvider and ITreePathContentProvider
 * as-is, and relies on the providers to return contents with the correct structure.
 * </p>
 * <p>
 * This method also accepts IStructuredContentProvider and wraps it in a FlatTreeContentProvider with an empty string
 * as the root node. If you need a different root node, construct your own FlatTreeContentProvider and pass it here.
 * If you want the Gallery to suppress the collapsable group header, call
 * </p>
 * <code>getGallery().setGroupRenderer(new NoGroupRenderer());</code>
 */
public void setContentProvider(IContentProvider provider) {
	if (provider instanceof IStructuredContentProvider
			&& !(provider instanceof ITreeContentProvider || provider instanceof ITreePathContentProvider)) {
		// Wrap a table-style contents with a single root node.
		super.setContentProvider(new FlatTreeContentProvider((IStructuredContentProvider) provider));
	} else {
		super.setContentProvider(provider);
	}
}