--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xml/xmldomandxpath/src/xmlenginedom/xmlengxpathevaluator.cpp	Thu Dec 17 09:29:21 2009 +0200
@@ -0,0 +1,137 @@
+// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+// XPath evaluator functions
+//
+
+#include "xmlengdomdefs.h" 
+#include <xml/dom/xmlengxpathevaluator.h>
+#include <xml/dom/xmlengxpathextensionfunction.h>
+#include <stdapis/libxml2/libxml2_xpath.h>
+#include <stdapis/libxml2/libxml2_globals.h>
+#include <xml/dom/xmlengxpatherrors.h>
+#include <xml/dom/xmlengnode.h>
+#include <xml/utils/xmlengmem.h>
+#include <xml/utils/xmlengxestrings.h>
+// Default constructor
+// --------------------------------------------------------------------------------------------
+//
+EXPORT_C TXmlEngXPathEvaluator::TXmlEngXPathEvaluator() : iInstanceTrees(NULL) 
+	{
+	}
+
+// --------------------------------------------------------------------------------------------
+// Precompiles and stores an XPath expression, which is returned to caller.
+//
+// @param[in] aExpression The expression as a string.
+// @param[in] aResolver An object that can resolve of namespace prefixes into namespace URIs
+// @return Compiled XPath expression.
+// 
+// May leave with KErrXPath code
+// --------------------------------------------------------------------------------------------
+//
+EXPORT_C RXmlEngXPathExpression TXmlEngXPathEvaluator::CreateExpressionL(
+    const TDesC8& aExpression, 
+    const MXmlEngNamespaceResolver* /* aResolver */)
+    {
+    xmlChar* exp = xmlCharFromDesC8L(aExpression);
+    xmlXPathCompExprPtr cExpr = xmlXPathCtxtCompile(NULL, exp);
+    delete exp;
+    if(xmlOOMFlag())
+        {
+        xmlXPathFreeCompExpr(cExpr);
+        OOM_HAPPENED;
+        }
+    if(!cExpr)
+        {
+        XmlEngLeaveL(KXmlEngErrXPathSyntax);
+        }
+
+    return RXmlEngXPathExpression(cExpr, iInstanceTrees);
+    }
+    
+// --------------------------------------------------------------------------------------------
+// Evaluates the XPath expression given as parameter. The result is returned.
+//
+// @param[in] aExpression The expression as a string.
+// @param[in] aContextNode The node relative to which the expression is evaluated. 
+// @param[in] aResolver (for future use) 
+// @return Result of evaluation as an RXmlEngXPathResult object.
+// May leave with KXmlEngErrXPathSyntax code for invalid XPathExpression and KXmlEngErrXPathResult 
+// for undefined result of evaluation.
+// --------------------------------------------------------------------------------------------
+//
+EXPORT_C RXmlEngXPathResult TXmlEngXPathEvaluator::EvaluateL(
+    const TDesC8& aExpression, 
+    const TXmlEngNode aContextNode, 
+    const MXmlEngNamespaceResolver* /* aResolver */ )
+    {
+    RXmlEngXPathExpression expr = CreateExpressionL(aExpression, NULL);
+    CleanupClosePushL(expr);
+    
+    RXmlEngXPathResult result = expr.EvaluateL(aContextNode);
+    CleanupStack::PopAndDestroy(&expr);
+    return result;
+    }
+
+// --------------------------------------------------------------------------------------------
+// Does the same as #evaluate, but as a side-effect calculates the dependency list of the 
+// expression. This is meant to be used by the XForms engine.
+//
+// @param[in] aExpression The expression as a string.
+// @param[in] aContextNode The node relative to which the expression is evaluated. 
+// @param[in] aResolver (for future use) 
+// @param[in,out] aDependents After the method has returned, contains set of nodes that 
+// the expression is dependent on.
+// @return Result of evaluation as an RXmlEngXPathResult object.
+// 
+// May leave with KXmlEngErrXPathResult or KXmlEngErrXPathSyntax codes.
+// --------------------------------------------------------------------------------------------
+//
+EXPORT_C RXmlEngXPathResult TXmlEngXPathEvaluator::EvaluateWithDependenciesL(
+    const TDesC8& aExpression, 
+    const TXmlEngNode aContextNode, 
+    const MXmlEngNamespaceResolver* /* aResolver */,
+    RXmlEngNodeSet& aDependents )
+    {
+    RXmlEngXPathExpression expr = CreateExpressionL(aExpression, NULL);
+    CleanupClosePushL(expr);
+    RXmlEngXPathResult result = expr.EvaluateWithDependenciesL(aContextNode, aDependents);
+    CleanupStack::PopAndDestroy(&expr);
+    return result;
+    }
+
+// --------------------------------------------------------------------------------------------
+// Registers the instance map to be used when evaluating XForms expressions. The map 
+// contains DOM Documents and their names. For example, when evaluating the expression 
+// "instance('a')" the evaluator looks up a Document that has the name "a" from the map. 
+// Method does not take owership, caller has to free the map.
+//
+// @param[in] aInstanceTrees The instance map.
+// --------------------------------------------------------------------------------------------
+//
+EXPORT_C void TXmlEngXPathEvaluator::SetInstanceMap(
+    CXmlEngXFormsInstanceMap* aInstanceTrees )
+    {
+    iInstanceTrees = aInstanceTrees;
+    }
+
+// -----------------------------------------------------------------------------
+// Returns the registered instance map.
+// @return pointer instance map or NULL if not registered.
+// -----------------------------------------------------------------------------
+//
+EXPORT_C CXmlEngXFormsInstanceMap* TXmlEngXPathEvaluator::InstanceMap()
+    {
+    return iInstanceTrees;
+    }