package net.sourceforge.phpdt.internal.debug.core.watch;

import net.sourceforge.phpdt.internal.debug.core.PHPDBGProxy;
import net.sourceforge.phpdt.internal.debug.core.model.PHPDebugTarget;
import net.sourceforge.phpdt.internal.debug.core.model.PHPStackFrame;
import net.sourceforge.phpdt.internal.debug.core.model.PHPVariable;

import org.eclipse.debug.core.model.IDebugElement;
import org.eclipse.debug.core.model.IWatchExpressionDelegate;
import org.eclipse.debug.core.model.IWatchExpressionListener;
import org.eclipse.debug.core.model.IWatchExpressionResult;

/**
 * 
 */
public class PHPWatchExpressionDelegate implements IWatchExpressionDelegate {

	public void evaluateExpression(String expression, IDebugElement context,
			IWatchExpressionListener listener) {
		IWatchExpressionResult x;
		PHPDBGProxy dbg;
		PHPStackFrame s;

		dbg = ((PHPDebugTarget) context.getDebugTarget()).getPHPDBGProxy();
		s = null;

		if (context instanceof PHPStackFrame) {
			s = (PHPStackFrame) context;
		}

		try {
			PHPVariable result[] = dbg.eval(s, expression);

			if (result.length == 0) {
				x = new PHPWatchExpressionResult(expression, null, null);
			} else {
				x = new PHPWatchExpressionResult(expression, result[0]
						.getValue(), null);
			}
		} catch (Exception e) {
			String[] s1;

			s1 = new String[1];
			s1[0] = e.toString();
			x = new PHPWatchExpressionResult(expression, null, s1);
		}

		listener.watchEvaluationFinished(x);
	}
}