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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org. If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+// MARKER(update_precomp.py): autogen include statement, do not remove
+#include "precompiled_forms.hxx"
+
+#include "computedexpression.hxx"
+#include "unohelper.hxx"
+#include "evaluationcontext.hxx"
+#include "NameContainer.hxx"
+
+#include <com/sun/star/container/XNameContainer.hpp>
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/xml/dom/NodeType.hpp>
+#include <com/sun/star/xml/dom/XNode.hpp>
+#include <com/sun/star/xml/xpath/XXPathAPI.hpp>
+#include <com/sun/star/xml/xpath/XXPathObject.hpp>
+#include <com/sun/star/xml/xpath/XXPathExtension.hpp>
+#include <com/sun/star/beans/NamedValue.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/lang/XMultiServiceFactory.hpp>
+#include <com/sun/star/util/SearchAlgorithms.hpp>
+
+#include <unotools/textsearch.hxx>
+#include <comphelper/processfactory.hxx>
+
+using rtl::OUString;
+using com::sun::star::beans::NamedValue;
+using com::sun::star::uno::Any;
+using com::sun::star::uno::Reference;
+using com::sun::star::uno::Sequence;
+using com::sun::star::lang::XInitialization;
+using com::sun::star::lang::XMultiServiceFactory;
+using com::sun::star::xml::dom::XNode;
+using com::sun::star::container::XNameContainer;
+using com::sun::star::xml::xpath::XXPathAPI;
+using com::sun::star::xml::xpath::XXPathExtension;
+using com::sun::star::xml::xpath::XXPathObject;
+using com::sun::star::uno::RuntimeException;
+using com::sun::star::uno::Exception;
+using com::sun::star::uno::UNO_QUERY_THROW;
+using com::sun::star::xml::xpath::XPathObjectType_XPATH_UNDEFINED;
+using com::sun::star::util::SearchOptions;
+using com::sun::star::util::SearchAlgorithms_REGEXP;
+
+
+namespace xforms
+{
+
+ComputedExpression::ComputedExpression()
+ : msExpression(),
+ mbIsEmpty( true ),
+ mbIsSimple( true ),
+ mxResult()
+{
+}
+
+ComputedExpression::~ComputedExpression()
+{
+}
+
+
+OUString ComputedExpression::getExpression() const
+{
+ return msExpression;
+}
+
+void ComputedExpression::setExpression( const OUString& rExpression )
+{
+ // set new expression, and clear pre-computed results
+ msExpression = rExpression;
+ mbIsEmpty = _checkExpression( " *" );
+ mbIsSimple = false;
+ mxResult.clear();
+}
+
+
+bool ComputedExpression::_checkExpression( const sal_Char* pExpression ) const
+{
+ OSL_ENSURE( pExpression != NULL, "no expression?" );
+
+ // call RegExp engine
+ SearchOptions aSearchOptions;
+ aSearchOptions.algorithmType = SearchAlgorithms_REGEXP;
+ aSearchOptions.searchString = String( pExpression, RTL_TEXTENCODING_ASCII_US );
+ utl::TextSearch aTextSearch( aSearchOptions );
+
+ xub_StrLen nLength =
+ static_cast<xub_StrLen>( msExpression.getLength() );
+ xub_StrLen nStart = 0;
+ xub_StrLen nEnd = nLength;
+ int nSearch = aTextSearch.SearchFrwrd( msExpression, &nStart, &nEnd );
+
+ // our expression is static only if 1) we found our regexp, and 2)
+ // the regexp goes from beginning to end.
+ return ( nLength == 0 || nSearch != 0 )
+ && ( nStart == 0 && nEnd == nLength );
+}
+
+/// do we have an actual expression?
+bool ComputedExpression::isEmptyExpression() const
+{
+ return mbIsEmpty;
+}
+
+bool ComputedExpression::isSimpleExpression() const
+{
+ // actual work is done by setExpression
+ return mbIsEmpty || mbIsSimple;
+}
+
+
+const OUString ComputedExpression::_getExpressionForEvaluation() const
+{
+ // the default implementation is to do nothing...
+ return msExpression;
+}
+
+bool ComputedExpression::_evaluate(
+ const xforms::EvaluationContext& rContext,
+ const OUString& sExpression )
+{
+ OSL_ENSURE( rContext.mxContextNode.is(), "no context node in context" );
+
+ // obtain value by evaluating XPath expression
+ mxResult.clear();
+ try
+ {
+ mxResult = _getXPathAPI(rContext)->eval( rContext.mxContextNode,
+ sExpression );
+ }
+ catch( const Exception& )
+ {
+ ; // ignore exception -> mxResult will be empty
+ }
+
+ return hasValue();
+}
+
+bool ComputedExpression::evaluate( const EvaluationContext& rContext )
+{
+ // for simple expression we don't need to re-evaluate (if we have
+ // an older result); neither for empty expressions
+ if( mbIsEmpty || (mxResult.is() && mbIsSimple) )
+ return true;
+
+ return _evaluate( rContext, _getExpressionForEvaluation() );
+}
+
+
+bool ComputedExpression::hasValue() const
+{
+ return mxResult.is() &&
+ mxResult->getObjectType() != XPathObjectType_XPATH_UNDEFINED;
+}
+
+void ComputedExpression::clear()
+{
+ mxResult.clear();
+}
+
+Reference<XXPathObject> ComputedExpression::getXPath()
+{
+ return mxResult;
+}
+
+OUString ComputedExpression::getString( const rtl::OUString& rDefault ) const
+{
+ return mxResult.is() ? mxResult->getString() : rDefault;
+}
+
+bool ComputedExpression::getBool( bool bDefault ) const
+{
+ return mxResult.is() ? mxResult->getBoolean() : bDefault;
+}
+
+
+
+
+Reference<XXPathAPI> ComputedExpression::_getXPathAPI(const xforms::EvaluationContext& aContext)
+{
+ // create XPath API, then register namespaces
+ Reference<XXPathAPI> xXPath( createInstance(
+ OUSTRING( "com.sun.star.xml.xpath.XPathAPI" ) ),
+ UNO_QUERY_THROW );
+ OSL_ENSURE( xXPath.is(), "cannot get XPath API" );
+
+ // register xforms extension#
+ Sequence< Any > aSequence(2);
+ NamedValue aValue;
+ aValue.Name = OUSTRING("Model");
+ aValue.Value <<= aContext.mxModel;
+ aSequence[0] <<= aValue;
+ aValue.Name = OUSTRING("ContextNode");
+ aValue.Value <<= aContext.mxContextNode;
+ aSequence[1] <<= aValue;
+ Reference<XMultiServiceFactory> aFactory = comphelper::getProcessServiceFactory();
+ Reference< XXPathExtension > aExtension( aFactory->createInstanceWithArguments(
+ OUSTRING( "com.sun.star.comp.xml.xpath.XFormsExtension"), aSequence), UNO_QUERY_THROW);
+ xXPath->registerExtensionInstance(aExtension);
+
+ // register namespaces
+ if( aContext.mxNamespaces.is() )
+ {
+ Sequence<OUString> aPrefixes =aContext.mxNamespaces->getElementNames();
+ sal_Int32 nCount = aPrefixes.getLength();
+ const OUString* pPrefixes = aPrefixes.getConstArray();
+ for( sal_Int32 i = 0; i < nCount; i++ )
+ {
+ const OUString* pNamePrefix = &pPrefixes[i];
+ OUString sNameURL;
+ aContext.mxNamespaces->getByName( *pNamePrefix ) >>= sNameURL;
+ xXPath->registerNS( *pNamePrefix, sNameURL );
+ }
+ }
+
+ // done, so return xXPath-object
+ return xXPath;
+}
+
+
+} // namespace xforms
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-21 22:42:37 +0000