/// <summary> /// Creates new instance of the map entry defined by this node. /// </summary> /// <param name="context">Context to evaluate expressions against.</param> /// <param name="evalContext">Current expression evaluation context.</param> /// <returns>Node's value.</returns> protected override object Get(object context, EvaluationContext evalContext) { BaseNode firstChild = (BaseNode)this.getFirstChild(); object key = GetValue(firstChild, context, evalContext); object value = GetValue((BaseNode)firstChild.getNextSibling(), context, evalContext); return(new DictionaryEntry(key, value)); }
/// <summary> /// Returns a <see cref="IList"/> containing results of evaluation /// of selection expression against each node in the context. /// </summary> /// <param name="context">Context to evaluate expressions against.</param> /// <param name="evalContext">Current expression evaluation context.</param> /// <returns>Node's value.</returns> protected override object Get(object context, EvaluationContext evalContext) { IEnumerable enumerable = context as IEnumerable; if (enumerable == null) { throw new ArgumentException( "Selection can only be used on an instance of the type that implements IEnumerable."); } BaseNode expression = (BaseNode)this.getFirstChild(); BaseNode minIndexExpression = (BaseNode)expression.getNextSibling(); BaseNode maxIndexExpression = (minIndexExpression == null) ? null : (BaseNode)minIndexExpression.getNextSibling(); int minIndex = (int)((minIndexExpression == null) ? Int32.MinValue : GetValue(minIndexExpression, context, evalContext)); int maxIndex = (int)((maxIndexExpression == null) ? Int32.MaxValue : GetValue(maxIndexExpression, context, evalContext)); IList selectionList = new ArrayList(); using (evalContext.SwitchThisContext()) { int found = 0; foreach (object o in enumerable) { evalContext.ThisContext = o; bool isMatch = (bool)GetValue(expression, o, evalContext); if (isMatch) { if (minIndex <= found && found <= maxIndex) { selectionList.Add(o); } found++; if (found > maxIndex) { break; // don't look any further } } } } return(selectionList); }