dom/xslt/xpath/txExprResult.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef TRANSFRMX_EXPRRESULT_H
   7 #define TRANSFRMX_EXPRRESULT_H
   8
   9 #include "nsString.h"
  10 #include "nsAutoPtr.h"
  11 #include "txCore.h"
  12 #include "txResultRecycler.h"
  13
  14 /*
  15  * ExprResult
  16  *
  17  * Classes Represented:
  18  * BooleanResult, ExprResult, NumberResult, StringResult
  19  *
  20  * Note: for NodeSet, see NodeSet.h
  21 */
  22
  23 class txAExprResult
  24 {
  25 public:
  26     friend class txResultRecycler;
  27
  28     // Update txLiteralExpr::getReturnType and sTypes in txEXSLTFunctions.cpp if
  29     // this enum is changed.
  30     enum ResultType {
  31         NODESET = 0,
  32         BOOLEAN,
  33         NUMBER,
  34         STRING,
  35         RESULT_TREE_FRAGMENT
  36     };
  37
  38     explicit txAExprResult(txResultRecycler* aRecycler) : mRecycler(aRecycler)
  39     {
  40     }
  41     virtual ~txAExprResult()
  42     {
  43     }
  44
  45     void AddRef()
  46     {
  47         ++mRefCnt;
  48         NS_LOG_ADDREF(this, mRefCnt, "txAExprResult", sizeof(*this));
  49     }
  50
  51     void Release(); // Implemented in txResultRecycler.cpp
  52
  53     /**
  54      * Returns the type of ExprResult represented
  55      * @return the type of ExprResult represented
  56     **/
  57     virtual short getResultType()      = 0;
  58
  59     /**
  60      * Creates a String representation of this ExprResult
  61      * @param aResult the destination string to append the String
  62      *                representation to.
  63     **/
  64     virtual void stringValue(nsString& aResult) = 0;
  65
  66     /**
  67      * Returns a pointer to the stringvalue if possible. Otherwise null is
  68      * returned.
  69      */
  70     virtual const nsString* stringValuePointer() = 0;
  71
  72     /**
  73      * Converts this ExprResult to a Boolean (bool) value
  74      * @return the Boolean value
  75     **/
  76     virtual bool booleanValue()          = 0;
  77
  78     /**
  79      * Converts this ExprResult to a Number (double) value
  80      * @return the Number value
  81     **/
  82     virtual double numberValue()          = 0;
  83
  84 private:
  85     nsAutoRefCnt mRefCnt;
  86     nsRefPtr<txResultRecycler> mRecycler;
  87 };
  88
  89 #define TX_DECL_EXPRRESULT                                        \
  90     virtual short getResultType();                                \
  91     virtual void stringValue(nsString& aString);                  \
  92     virtual const nsString* stringValuePointer();                 \
  93     virtual bool booleanValue();                                \
  94     virtual double numberValue();                                 \
  95
  96
  97 class BooleanResult : public txAExprResult {
  98
  99 public:
 100     explicit BooleanResult(bool aValue);
 101
 102     TX_DECL_EXPRRESULT
 103
 104 private:
 105     bool value;
 106 };
 107
 108 class NumberResult : public txAExprResult {
 109
 110 public:
 111     NumberResult(double aValue, txResultRecycler* aRecycler);
 112
 113     TX_DECL_EXPRRESULT
 114
 115     double value;
 116
 117 };
 118
 119
 120 class StringResult : public txAExprResult {
 121 public:
 122     explicit StringResult(txResultRecycler* aRecycler);
 123     StringResult(const nsAString& aValue, txResultRecycler* aRecycler);
 124
 125     TX_DECL_EXPRRESULT
 126
 127     nsString mValue;
 128 };
 129
 130 #endif
 131