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/*******************************************************************************
 * Copyright (c) 2011, 2014 Wind River Systems, Inc. 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:
 * Wind River Systems - initial API and implementation
 *******************************************************************************/
package org.eclipse.tcf.te.tcf.filesystem.ui.controls;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.viewers.ITreeViewerListener;
import org.eclipse.jface.viewers.TreeExpansionEvent;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.tcf.te.tcf.filesystem.core.model.AbstractTreeNode;
import org.eclipse.tcf.te.tcf.filesystem.core.model.ITreeNodeModel;
import org.eclipse.tcf.te.tcf.locator.interfaces.nodes.IPeerNode;


/**
 * The base navigator content provider for File System and Process Monitor
 */
public abstract class NavigatorContentProvider extends TreeContentProvider  implements ITreeViewerListener {

	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
	 */
	@Override
	public Object getParent(Object element) {
		if (element instanceof AbstractTreeNode) {
			AbstractTreeNode node = (AbstractTreeNode) element;
			AbstractTreeNode parent = node.getParent();
			if (parent != null) {
				if (parent.isSystemRoot()) {
					if (isRootNodeVisible()) return parent;
					return null;
				}
				return parent;
			}
			if (isRootNodeVisible()) return node.peerNode;
		}
		return null;
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ITreeViewerListener#treeCollapsed(org.eclipse.jface.viewers.TreeExpansionEvent)
	 */
	@Override
    public void treeCollapsed(TreeExpansionEvent event) {
    }

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ITreeViewerListener#treeExpanded(org.eclipse.jface.viewers.TreeExpansionEvent)
	 */
	@Override
    public void treeExpanded(TreeExpansionEvent event) {
		Object object = event.getElement();
	    if(object instanceof AbstractTreeNode) {
	    	AbstractTreeNode parent = (AbstractTreeNode) object;
			if (parent.childrenQueried && !parent.childrenQueryRunning) {
				parent.refreshChildren();
			}
		}
    }

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.tcf.te.ui.trees.TreeContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
	 */
	@Override
    public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
	    super.inputChanged(viewer, oldInput, newInput);
	    this.viewer.addTreeListener(this);
    }

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.tcf.te.ui.trees.TreeContentProvider#dispose()
	 */
	@Override
    public void dispose() {
	    this.viewer.removeTreeListener(this);
	    super.dispose();
    }

	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
	 */
	@Override
	public Object[] getChildren(Object parentElement) {
		super.getChildren(parentElement);

		if (parentElement instanceof IPeerNode) {
			final IPeerNode peerNode = (IPeerNode)parentElement;
			ITreeNodeModel model = doGetModel(peerNode);
			if (isRootNodeVisible()) {
				AbstractTreeNode root = model.getRoot();
				if(!root.childrenQueried && !root.childrenQueryRunning) {
					root.queryChildren();
				}
				return new Object[] { root };
			}
			return getChildren(model.getRoot());
		} else if (parentElement instanceof AbstractTreeNode) {
			AbstractTreeNode node = (AbstractTreeNode)parentElement;
			List<Object> current = new ArrayList<Object>(node.getChildren());
			if (!node.childrenQueried) {
				current.add(getPending(node));
				if (!node.childrenQueryRunning) {
					node.queryChildren();
				}
			}
			return current.toArray();
		}

		return NO_ELEMENTS;
	}

	/**
	 * Get the tree node model for this peer node.
	 *
	 * @param peerNode The peer node from where to get the model.
	 * @return The tree node model.
	 */
	protected abstract ITreeNodeModel doGetModel(IPeerNode peerNode);

	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
	 */
	@Override
	public boolean hasChildren(final Object element) {
		Assert.isNotNull(element);

		boolean hasChildren = false;

		if (element instanceof AbstractTreeNode) {
			AbstractTreeNode node = (AbstractTreeNode)element;
			if(node.isSystemRoot()) {
				hasChildren = true;
			}
			else {
				hasChildren = !node.childrenQueried || super.hasChildren(element);
			}
		}
		else if (element instanceof IPeerNode) {
			IPeerNode peerNode = (IPeerNode) element;
			ITreeNodeModel model = doGetModel(peerNode);
			AbstractTreeNode root = model.getRoot();
			hasChildren = root != null ? hasChildren(root) : true;
		}

		return hasChildren;
	}

	/**
	 * If the root node of the tree is visible.
	 *
	 * @return true if it is visible.
	 */
	protected boolean isRootNodeVisible() {
		return true;
	}
}

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