michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef TRANSFRMX_EXPRRESULT_H
michael@0: #define TRANSFRMX_EXPRRESULT_H
michael@0: 
michael@0: #include "nsString.h"
michael@0: #include "nsAutoPtr.h"
michael@0: #include "txCore.h"
michael@0: #include "txResultRecycler.h"
michael@0: 
michael@0: /*
michael@0:  * ExprResult
michael@0:  *
michael@0:  * Classes Represented:
michael@0:  * BooleanResult, ExprResult, NumberResult, StringResult
michael@0:  *
michael@0:  * Note: for NodeSet, see NodeSet.h
michael@0: */
michael@0: 
michael@0: class txAExprResult
michael@0: {
michael@0: public:
michael@0:     friend class txResultRecycler;
michael@0: 
michael@0:     // Update txLiteralExpr::getReturnType and sTypes in txEXSLTFunctions.cpp if
michael@0:     // this enum is changed.
michael@0:     enum ResultType {
michael@0:         NODESET = 0,
michael@0:         BOOLEAN,
michael@0:         NUMBER,
michael@0:         STRING,
michael@0:         RESULT_TREE_FRAGMENT
michael@0:     };
michael@0: 
michael@0:     txAExprResult(txResultRecycler* aRecycler) : mRecycler(aRecycler)
michael@0:     {
michael@0:     }
michael@0:     virtual ~txAExprResult()
michael@0:     {
michael@0:     }
michael@0: 
michael@0:     void AddRef()
michael@0:     {
michael@0:         ++mRefCnt;
michael@0:         NS_LOG_ADDREF(this, mRefCnt, "txAExprResult", sizeof(*this));
michael@0:     }
michael@0:     
michael@0:     void Release(); // Implemented in txResultRecycler.cpp
michael@0: 
michael@0:     /**
michael@0:      * Returns the type of ExprResult represented
michael@0:      * @return the type of ExprResult represented
michael@0:     **/
michael@0:     virtual short getResultType()      = 0;
michael@0: 
michael@0:     /**
michael@0:      * Creates a String representation of this ExprResult
michael@0:      * @param aResult the destination string to append the String
michael@0:      *                representation to.
michael@0:     **/
michael@0:     virtual void stringValue(nsString& aResult) = 0;
michael@0: 
michael@0:     /**
michael@0:      * Returns a pointer to the stringvalue if possible. Otherwise null is
michael@0:      * returned.
michael@0:      */
michael@0:     virtual const nsString* stringValuePointer() = 0;
michael@0: 
michael@0:     /**
michael@0:      * Converts this ExprResult to a Boolean (bool) value
michael@0:      * @return the Boolean value
michael@0:     **/
michael@0:     virtual bool booleanValue()          = 0;
michael@0: 
michael@0:     /**
michael@0:      * Converts this ExprResult to a Number (double) value
michael@0:      * @return the Number value
michael@0:     **/
michael@0:     virtual double numberValue()          = 0;
michael@0: 
michael@0: private:
michael@0:     nsAutoRefCnt mRefCnt;
michael@0:     nsRefPtr<txResultRecycler> mRecycler;
michael@0: };
michael@0: 
michael@0: #define TX_DECL_EXPRRESULT                                        \
michael@0:     virtual short getResultType();                                \
michael@0:     virtual void stringValue(nsString& aString);                  \
michael@0:     virtual const nsString* stringValuePointer();                 \
michael@0:     virtual bool booleanValue();                                \
michael@0:     virtual double numberValue();                                 \
michael@0: 
michael@0: 
michael@0: class BooleanResult : public txAExprResult {
michael@0: 
michael@0: public:
michael@0:     BooleanResult(bool aValue);
michael@0: 
michael@0:     TX_DECL_EXPRRESULT
michael@0: 
michael@0: private:
michael@0:     bool value;
michael@0: };
michael@0: 
michael@0: class NumberResult : public txAExprResult {
michael@0: 
michael@0: public:
michael@0:     NumberResult(double aValue, txResultRecycler* aRecycler);
michael@0: 
michael@0:     TX_DECL_EXPRRESULT
michael@0: 
michael@0:     double value;
michael@0: 
michael@0: };
michael@0: 
michael@0: 
michael@0: class StringResult : public txAExprResult {
michael@0: public:
michael@0:     StringResult(txResultRecycler* aRecycler);
michael@0:     StringResult(const nsAString& aValue, txResultRecycler* aRecycler);
michael@0: 
michael@0:     TX_DECL_EXPRRESULT
michael@0: 
michael@0:     nsString mValue;
michael@0: };
michael@0: 
michael@0: #endif
michael@0: