// <summary> // Construct a new placeholder with the shape of the given placeholder. Key values are // injected into the resulting place holder and default values are substituted with // either propagator constants or progagator nulls depending on the mode established // by the <paramref name="mode" /> flag. // </summary> // <remarks> // The key is essentially an array of values. The key map indicates that for a particular // placeholder an expression (keyMap.Keys) corresponds to some ordinal in the key array. // </remarks> // <param name="placeholder"> Placeholder to clone </param> // <param name="key"> Key to substitute </param> // <param name="placeholderKey"> Key elements in the placeholder (ordinally aligned with 'key') </param> // <param name="mode"> Mode of operation. </param> // <returns> Cloned placeholder with key values </returns> internal static PropagatorResult Populate( PropagatorResult placeholder, CompositeKey key, CompositeKey placeholderKey, PopulateMode mode) { DebugCheck.NotNull(placeholder); DebugCheck.NotNull(key); DebugCheck.NotNull(placeholderKey); // Figure out which flags to apply to generated elements. var isNull = mode == PopulateMode.NullModified || mode == PopulateMode.NullPreserve; var preserve = mode == PopulateMode.NullPreserve || mode == PopulateMode.Unknown; var flags = PropagatorFlags.NoFlags; if (!isNull) { flags |= PropagatorFlags.Unknown; } // only null values are known if (preserve) { flags |= PropagatorFlags.Preserve; } var result = placeholder.Replace( node => { // See if this is a key element var keyIndex = -1; for (var i = 0; i < placeholderKey.KeyComponents.Length; i++) { if (placeholderKey.KeyComponents[i] == node) { keyIndex = i; break; } } if (keyIndex != -1) { // Key value. return(key.KeyComponents[keyIndex]); } else { // for simple entries, just return using the markup context for this // populator var value = isNull ? null : node.GetSimpleValue(); return(PropagatorResult.CreateSimpleValue(flags, value)); } }); return(result); }
// <summary> // Construct a new placeholder with the shape of the given placeholder. Key values are // injected into the resulting place holder and default values are substituted with // either propagator constants or progagator nulls depending on the mode established // by the <paramref name="mode" /> flag. // </summary> // <remarks> // The key is essentially an array of values. The key map indicates that for a particular // placeholder an expression (keyMap.Keys) corresponds to some ordinal in the key array. // </remarks> // <param name="placeholder"> Placeholder to clone </param> // <param name="key"> Key to substitute </param> // <param name="placeholderKey"> Key elements in the placeholder (ordinally aligned with 'key') </param> // <param name="mode"> Mode of operation. </param> // <returns> Cloned placeholder with key values </returns> internal static PropagatorResult Populate( PropagatorResult placeholder, CompositeKey key, CompositeKey placeholderKey, PopulateMode mode) { DebugCheck.NotNull(placeholder); DebugCheck.NotNull(key); DebugCheck.NotNull(placeholderKey); // Figure out which flags to apply to generated elements. var isNull = mode == PopulateMode.NullModified || mode == PopulateMode.NullPreserve; var preserve = mode == PopulateMode.NullPreserve || mode == PopulateMode.Unknown; var flags = PropagatorFlags.NoFlags; if (!isNull) { flags |= PropagatorFlags.Unknown; } // only null values are known if (preserve) { flags |= PropagatorFlags.Preserve; } var result = placeholder.Replace( node => { // See if this is a key element var keyIndex = -1; for (var i = 0; i < placeholderKey.KeyComponents.Length; i++) { if (placeholderKey.KeyComponents[i] == node) { keyIndex = i; break; } } if (keyIndex != -1) { // Key value. return key.KeyComponents[keyIndex]; } else { // for simple entries, just return using the markup context for this // populator var value = isNull ? null : node.GetSimpleValue(); return PropagatorResult.CreateSimpleValue(flags, value); } }); return result; }