InstContentProvider.java

/*
  InstContentProvider.java

  (c) 2009-2013 Edward Swartz

  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
 */
package v9t9.gui.client.swt.shells.debugger;

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

import org.eclipse.jface.viewers.ILazyContentProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.widgets.Display;

class InstContentProvider implements ILazyContentProvider {

	private List<InstRow> insts;
	private TableViewer tableViewer;
	
	/**
	 * 
	 */
	public InstContentProvider() {
		insts = new ArrayList<InstRow>(256);
	}
	
	public void dispose() {
		
	}

	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		this.tableViewer = (TableViewer) viewer;
		
		// clear
		tableViewer.setItemCount(0);
		insts.clear();
	}

	public void updateElement(int index) {
		if (index < insts.size()) {
			tableViewer.replace(insts.get(index), index);
		}
	}
	
	public void addInstRow(final InstRow row) {
		if (insts.size() > 100000) {
			int cutoff = insts.size() / 2;
			if (Display.getCurrent() != null)
				tableViewer.remove(insts.subList(0, cutoff).toArray());
			insts = new ArrayList<InstRow>(insts.subList(cutoff, insts.size()));
		}
		insts.add(row);
		if (Display.getCurrent() != null)
			tableViewer.add(row);
	}
	
	public int getCount() {
		return insts.size();
	}

	/**
	 * @return
	 */
	public InstRow getLast() {
		return insts.size() > 0 ? insts.get(insts.size() - 1) : null;
	}

	public void removeInstRow(InstRow row) {
		insts.remove(row);
		if (Display.getCurrent() != null)
			tableViewer.remove(row);
	}
	/**
	 * 
	 */
	public void clear() {
		insts.clear();
		if (Display.getCurrent() != null)
			tableViewer.setItemCount(0);
	}
}