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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / XmlUtils / System / Xml / Xsl / Runtime / WhitespaceRuleLookup.cs / 1305376 / WhitespaceRuleLookup.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System; using System.Xml; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using MS.Internal.Xml; using System.Xml.Xsl.Qil; namespace System.Xml.Xsl.Runtime { ////// This class keeps a list of whitespace rules in order to determine whether whitespace children of particular /// elements should be stripped. /// internal class WhitespaceRuleLookup { private Hashtable qnames; private ArrayList wildcards; private InternalWhitespaceRule ruleTemp; private XmlNameTable nameTable; public WhitespaceRuleLookup() { this.qnames = new Hashtable(); this.wildcards = new ArrayList(); } ////// Create a new lookup internal class from the specified WhitespaceRules. /// public WhitespaceRuleLookup(IListrules) : this() { WhitespaceRule rule; InternalWhitespaceRule ruleInternal; Debug.Assert(rules != null); for (int i = rules.Count - 1; i >= 0; i--) { // Make a copy of each rule rule = rules[i]; ruleInternal = new InternalWhitespaceRule(rule.LocalName, rule.NamespaceName, rule.PreserveSpace, -i); if (rule.LocalName == null || rule.NamespaceName == null) { // Wildcard, so add to wildcards array this.wildcards.Add(ruleInternal); } else { // Exact name, so add to hashtable this.qnames[ruleInternal] = ruleInternal; } } // Create a temporary (not thread-safe) InternalWhitespaceRule used for lookups this.ruleTemp = new InternalWhitespaceRule(); } /// /// Atomize all names contained within the whitespace rules with respect to "nameTable". /// public void Atomize(XmlNameTable nameTable) { // If names are already atomized with respect to "nameTable", no need to do it again if (nameTable != this.nameTable) { this.nameTable = nameTable; foreach (InternalWhitespaceRule rule in this.qnames.Values) rule.Atomize(nameTable); foreach (InternalWhitespaceRule rule in this.wildcards) rule.Atomize(nameTable); } } ////// Return true if elements of the specified name should have whitespace children stripped. /// NOTE: This method is not thread-safe. Different threads should create their own copy of the /// WhitespaceRuleLookup object. This allows all names to be atomized according to a private NameTable. /// public bool ShouldStripSpace(string localName, string namespaceName) { InternalWhitespaceRule qnameRule, wildcardRule; Debug.Assert(this.nameTable != null && this.ruleTemp != null); Debug.Assert(localName != null && (object) this.nameTable.Get(localName) == (object) localName); Debug.Assert(namespaceName != null && (object) this.nameTable.Get(namespaceName) == (object) namespaceName); this.ruleTemp.Init(localName, namespaceName, false, 0); // Lookup name in qnames table // If found, the name will be stripped unless there is a preserve wildcard with higher priority qnameRule = this.qnames[this.ruleTemp] as InternalWhitespaceRule; for (int pos = this.wildcards.Count; pos-- != 0;) { wildcardRule = this.wildcards[pos] as InternalWhitespaceRule; if (qnameRule != null) { // If qname priority is greater than any subsequent wildcard's priority, then we're done if (qnameRule.Priority > wildcardRule.Priority) return !qnameRule.PreserveSpace; // Don't bother to consider wildcards with the same PreserveSpace flag if (qnameRule.PreserveSpace == wildcardRule.PreserveSpace) continue; } if (wildcardRule.LocalName == null || (object) wildcardRule.LocalName == (object) localName) { if (wildcardRule.NamespaceName == null || (object) wildcardRule.NamespaceName == (object) namespaceName) { // Found wildcard match, so we're done (since wildcards are in priority order) return !wildcardRule.PreserveSpace; } } } return (qnameRule != null && !qnameRule.PreserveSpace); } private class InternalWhitespaceRule : WhitespaceRule { private int priority; // Relative priority of this test private int hashCode; // Cached hashcode public InternalWhitespaceRule() { } public InternalWhitespaceRule(string localName, string namespaceName, bool preserveSpace, int priority) { Init(localName, namespaceName, preserveSpace, priority); } public void Init(string localName, string namespaceName, bool preserveSpace, int priority) { base.Init(localName, namespaceName, preserveSpace); this.priority = priority; if (localName != null && namespaceName != null) { this.hashCode = localName.GetHashCode(); } } public void Atomize(XmlNameTable nameTable) { if (LocalName != null) LocalName = nameTable.Add(LocalName); if (NamespaceName != null) NamespaceName = nameTable.Add(NamespaceName); } public int Priority { get { return this.priority; } } public override int GetHashCode() { return this.hashCode; } public override bool Equals(object obj) { Debug.Assert(obj is InternalWhitespaceRule); InternalWhitespaceRule that = obj as InternalWhitespaceRule; Debug.Assert(LocalName != null && that.LocalName != null); Debug.Assert(NamespaceName != null && that.NamespaceName != null); // string == operator compares object references first and if they are not the same compares contents // of the compared strings. As a result we do not have to cast strings to objects to force reference // comparison for atomized LocalNames and NamespaceNames. return LocalName == that.LocalName && NamespaceName == that.NamespaceName; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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