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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* 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.
*
************************************************************************/
#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() const
{
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
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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