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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / XmlUtils / System / Xml / Xsl / Runtime / DodSequenceMerge.cs / 1305376 / DodSequenceMerge.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Xml.XPath; using System.Diagnostics; using System.Globalization; using System.ComponentModel; namespace System.Xml.Xsl.Runtime { ////// Merges several doc-order-distinct sequences into a single doc-order-distinct sequence. /// [EditorBrowsable(EditorBrowsableState.Never)] public struct DodSequenceMerge { private IListfirstSequence; private List > sequencesToMerge; private int nodeCount; private XmlQueryRuntime runtime; /// /// Initialize this instance of DodSequenceMerge. /// public void Create(XmlQueryRuntime runtime) { this.firstSequence = null; this.sequencesToMerge = null; this.nodeCount = 0; this.runtime = runtime; } ////// Add a new sequence to the list of sequences to merge. /// public void AddSequence(IListsequence) { // Ignore empty sequences if (sequence.Count == 0) return; if (this.firstSequence == null) { this.firstSequence = sequence; } else { if (this.sequencesToMerge == null) { this.sequencesToMerge = new List >(); MoveAndInsertSequence(this.firstSequence.GetEnumerator()); this.nodeCount = this.firstSequence.Count; } MoveAndInsertSequence(sequence.GetEnumerator()); this.nodeCount += sequence.Count; } } /// /// Return the fully merged sequence. /// public IListMergeSequences() { XmlQueryNodeSequence newSequence; // Zero sequences to merge if (this.firstSequence == null) return XmlQueryNodeSequence.Empty; // One sequence to merge if (this.sequencesToMerge == null || this.sequencesToMerge.Count <= 1) return this.firstSequence; // Two or more sequences to merge newSequence = new XmlQueryNodeSequence(this.nodeCount); while (this.sequencesToMerge.Count != 1) { // Save last item in list in temp variable, and remove it from list IEnumerator sequence = this.sequencesToMerge[this.sequencesToMerge.Count - 1]; this.sequencesToMerge.RemoveAt(this.sequencesToMerge.Count - 1); // Add current node to merged sequence newSequence.Add(sequence.Current); // Now move to the next node, and re-insert it into the list in reverse document order MoveAndInsertSequence(sequence); } // Add nodes in remaining sequence to end of list Debug.Assert(this.sequencesToMerge.Count == 1, "While loop should terminate when count == 1"); do { newSequence.Add(this.sequencesToMerge[0].Current); } while (this.sequencesToMerge[0].MoveNext()); return newSequence; } /// /// Move to the next item in the sequence. If there is no next item, then do not /// insert the sequence. Otherwise, call InsertSequence. /// private void MoveAndInsertSequence(IEnumeratorsequence) { if (sequence.MoveNext()) InsertSequence(sequence); } /// /// Insert the specified sequence into the list of sequences to be merged. /// Insert it in reverse document order with respect to the current nodes in other sequences. /// private void InsertSequence(IEnumeratorsequence) { for (int i = this.sequencesToMerge.Count - 1; i >= 0; i--) { int cmp = this.runtime.ComparePosition(sequence.Current, this.sequencesToMerge[i].Current); if (cmp == -1) { // Insert after current item this.sequencesToMerge.Insert(i + 1, sequence); return; } else if (cmp == 0) { // Found duplicate, so skip the duplicate if (!sequence.MoveNext()) { // No more nodes, so don't insert anything return; } // Next node must be after current node in document order, so don't need to reset loop } } // Insert at beginning of list this.sequencesToMerge.Insert(0, sequence); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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