Bug 183733 Implement the IScriptOjectClassInfo to provide the class infromation to support the JS code assistant.
Engine should implement the IScriptObjectClassInfo interface to return the class information for script object.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
{
		isCancelled = true;
	}
	public boolean isCanceled( )
	{
		return isCancelled;
	}
	
	public void setCancelOnError( boolean cancel )
	{
		cancelOnError = cancel;
	}
	
	public void setDataSource( IDocArchiveReader dataSource )
			throws IOException
	{
		dataSource.open( );
		this.dataSource = dataSource;
	}
	
	public IDocArchiveReader getDataSource()
	{
		return dataSource;
	}
	
	public IBaseResultSet executeQuery( IBaseResultSet parent,
			IDataQueryDefinition query, boolean useCache ) throws BirtException
	{
		IDataEngine dataEngine = getDataEngine( );
		return dataEngine.execute( parent, query, useCache);