Bug 212505 Use default script ID to skip script debugging
In Dte side, when compile or evaluate java script, it would pass in a script source id. This kind of id is currenlty used by report script debugger. So to skip redundant processing for such kind of internal script evaluating, dte need pass in a default ID, which is defined as ScriptExpression.defaultID. If this id is already used for particular meaning and it can not pass in the default ID, we need define them as public constants and let script debugger check and skip them as well.
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);
	}