1*2d785d7eSAndrew Rist /************************************************************** 2cdf0e10cSrcweir * 3*2d785d7eSAndrew Rist * Licensed to the Apache Software Foundation (ASF) under one 4*2d785d7eSAndrew Rist * or more contributor license agreements. See the NOTICE file 5*2d785d7eSAndrew Rist * distributed with this work for additional information 6*2d785d7eSAndrew Rist * regarding copyright ownership. The ASF licenses this file 7*2d785d7eSAndrew Rist * to you under the Apache License, Version 2.0 (the 8*2d785d7eSAndrew Rist * "License"); you may not use this file except in compliance 9*2d785d7eSAndrew Rist * with the License. You may obtain a copy of the License at 10*2d785d7eSAndrew Rist * 11*2d785d7eSAndrew Rist * http://www.apache.org/licenses/LICENSE-2.0 12*2d785d7eSAndrew Rist * 13*2d785d7eSAndrew Rist * Unless required by applicable law or agreed to in writing, 14*2d785d7eSAndrew Rist * software distributed under the License is distributed on an 15*2d785d7eSAndrew Rist * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16*2d785d7eSAndrew Rist * KIND, either express or implied. See the License for the 17*2d785d7eSAndrew Rist * specific language governing permissions and limitations 18*2d785d7eSAndrew Rist * under the License. 19*2d785d7eSAndrew Rist * 20*2d785d7eSAndrew Rist *************************************************************/ 21*2d785d7eSAndrew Rist 22*2d785d7eSAndrew Rist 23cdf0e10cSrcweir 24cdf0e10cSrcweir #ifndef _COMPUTEDEXPRESSION_HXX 25cdf0e10cSrcweir #define _COMPUTEDEXPRESSION_HXX 26cdf0e10cSrcweir 27cdf0e10cSrcweir 28cdf0e10cSrcweir // includes for member variables 29cdf0e10cSrcweir #include <rtl/ustring.hxx> 30cdf0e10cSrcweir #include <com/sun/star/uno/Reference.hxx> 31cdf0e10cSrcweir 32cdf0e10cSrcweir // forward declaractions 33cdf0e10cSrcweir namespace com { namespace sun { namespace star 34cdf0e10cSrcweir { 35cdf0e10cSrcweir namespace xml 36cdf0e10cSrcweir { 37cdf0e10cSrcweir namespace dom { class XNode; } 38cdf0e10cSrcweir namespace dom { class XNodeset; } 39cdf0e10cSrcweir namespace xpath { class XXPathAPI; } 40cdf0e10cSrcweir namespace xpath { class XXPathObject; } 41cdf0e10cSrcweir } 42cdf0e10cSrcweir namespace container { class XNameContainer; } 43cdf0e10cSrcweir } } } 44cdf0e10cSrcweir namespace xforms { class EvaluationContext; } 45cdf0e10cSrcweir 46cdf0e10cSrcweir 47cdf0e10cSrcweir 48cdf0e10cSrcweir namespace xforms 49cdf0e10cSrcweir { 50cdf0e10cSrcweir 51cdf0e10cSrcweir /** ComputedExpression represents an XPath Expression and caches results. 52cdf0e10cSrcweir * 53cdf0e10cSrcweir * As this class has no virtual methods, it should never be used 54cdf0e10cSrcweir * polymorphically. */ 55cdf0e10cSrcweir class ComputedExpression 56cdf0e10cSrcweir { 57cdf0e10cSrcweir /// the expression string 58cdf0e10cSrcweir rtl::OUString msExpression; 59cdf0e10cSrcweir 60cdf0e10cSrcweir /// is msExpression empty? 61cdf0e10cSrcweir bool mbIsEmpty; 62cdf0e10cSrcweir 63cdf0e10cSrcweir protected: 64cdf0e10cSrcweir /// is msExpression a simple expression? 65cdf0e10cSrcweir bool mbIsSimple; 66cdf0e10cSrcweir 67cdf0e10cSrcweir /// the result from the last bind 68cdf0e10cSrcweir com::sun::star::uno::Reference<com::sun::star::xml::xpath::XXPathObject> mxResult; 69cdf0e10cSrcweir 70cdf0e10cSrcweir 71cdf0e10cSrcweir /// implementation of isSimpleExpression 72cdf0e10cSrcweir bool _checkExpression( const sal_Char* pExpression ) const; 73cdf0e10cSrcweir 74cdf0e10cSrcweir /// allow manipulation of the expression before it is evaluated 75cdf0e10cSrcweir const rtl::OUString _getExpressionForEvaluation() const; 76cdf0e10cSrcweir 77cdf0e10cSrcweir /// obtain a (suitable) XPathAPI implementation 78cdf0e10cSrcweir com::sun::star::uno::Reference<com::sun::star::xml::xpath::XXPathAPI> _getXPathAPI(const xforms::EvaluationContext& aContext); 79cdf0e10cSrcweir 80cdf0e10cSrcweir /// evaluate the expression relative to the content node. 81cdf0e10cSrcweir bool _evaluate( const xforms::EvaluationContext& rContext, 82cdf0e10cSrcweir const rtl::OUString& sExpression ); 83cdf0e10cSrcweir 84cdf0e10cSrcweir 85cdf0e10cSrcweir public: 86cdf0e10cSrcweir ComputedExpression(); 87cdf0e10cSrcweir ~ComputedExpression(); 88cdf0e10cSrcweir 89cdf0e10cSrcweir 90cdf0e10cSrcweir /// get the expression string 91cdf0e10cSrcweir rtl::OUString getExpression() const; 92cdf0e10cSrcweir 93cdf0e10cSrcweir /// set a new expression string 94cdf0e10cSrcweir void setExpression( const rtl::OUString& rExpression ); 95cdf0e10cSrcweir 96cdf0e10cSrcweir /// get the namespaces that are used to interpret the expression string 97cdf0e10cSrcweir com::sun::star::uno::Reference<com::sun::star::container::XNameContainer> getNamespaces() const; 98cdf0e10cSrcweir 99cdf0e10cSrcweir /// set the namespaces that are used to interpret the expression string 100cdf0e10cSrcweir void setNamespaces( const com::sun::star::uno::Reference<com::sun::star::container::XNameContainer>& ); 101cdf0e10cSrcweir 102cdf0e10cSrcweir /// do we have an actual expression? 103cdf0e10cSrcweir bool isEmptyExpression() const; 104cdf0e10cSrcweir 105cdf0e10cSrcweir /// heuristically determine whether this expression is 'simple', 106cdf0e10cSrcweir /// i.e. whether its value will change depending on the values 107cdf0e10cSrcweir /// of other nodes 108cdf0e10cSrcweir bool isSimpleExpression() const; 109cdf0e10cSrcweir 110cdf0e10cSrcweir 111cdf0e10cSrcweir /// evaluate the expression relative to the content node. 112cdf0e10cSrcweir bool evaluate( const xforms::EvaluationContext& rContext ); 113cdf0e10cSrcweir 114cdf0e10cSrcweir 115cdf0e10cSrcweir /// does this expression have a value? 116cdf0e10cSrcweir bool hasValue() const; 117cdf0e10cSrcweir 118cdf0e10cSrcweir 119cdf0e10cSrcweir /// remove value/evaluate results 120cdf0e10cSrcweir void clear(); 121cdf0e10cSrcweir 122cdf0e10cSrcweir 123cdf0e10cSrcweir // get the result of this expression as string/bool/... 124cdf0e10cSrcweir // (Results will be based on the last call of evaluate(..). The caller 125cdf0e10cSrcweir // must call evaluate to ensure current results.) 126cdf0e10cSrcweir com::sun::star::uno::Reference<com::sun::star::xml::xpath::XXPathObject> getXPath(); 127cdf0e10cSrcweir bool getBool( bool bDefault = false ) const; 128cdf0e10cSrcweir rtl::OUString getString( const rtl::OUString& rDefault = rtl::OUString() ) const; 129cdf0e10cSrcweir 130cdf0e10cSrcweir }; 131cdf0e10cSrcweir 132cdf0e10cSrcweir } // namespace xforms 133cdf0e10cSrcweir 134cdf0e10cSrcweir #endif 135