/**
* Validates if the drop is valid by validating the local selection transfer to ensure that a
* watch expression can be created for each contained IVariable.
*
* @param target target of the drop
* @return whether the drop is valid
*/
private boolean validateVariableDrop(Object target) {
// Target must be null or an IExpression, you cannot add a new watch expression inside another
if (target != null && getTargetExpression(target) == null) {
return false;
}
IStructuredSelection selection =
(IStructuredSelection) LocalSelectionTransfer.getTransfer().getSelection();
int enabled = 0;
int size = -1;
if (selection != null) {
size = selection.size();
IExpressionManager manager = DebugPlugin.getDefault().getExpressionManager();
Iterator iterator = selection.iterator();
while (iterator.hasNext()) {
Object element = iterator.next();
if (element instanceof IVariable) {
IVariable variable = (IVariable) element;
if (variable instanceof IndexedVariablePartition) {
break;
} else if (manager.hasWatchExpressionDelegate(variable.getModelIdentifier())
&& isFactoryEnabled(variable)) {
enabled++;
} else {
break;
}
}
}
}
return enabled == size;
}
/**
* Creates an expression, adds it to the expression manager and set the debug context.<br>
* This default behavior can be subclassed to be changed.
*
* @param expressionManager
* @param expression
*/
@SuppressWarnings("restriction")
protected void createExpression(IExpressionManager expressionManager, String expression) {
IWatchExpression watchExpression = expressionManager.newWatchExpression(expression.trim());
expressionManager.addExpression(watchExpression);
// refresh and re-evaluate
watchExpression.setExpressionContext(getContext());
}