Home | History | Annotate | Download | only in xml 
      1 /*
      2  * Copyright 2005 Frerich Raabe <raabe (at) kde.org>
      3  * Copyright (C) 2006 Apple Computer, Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef XPathValue_h
     28 #define XPathValue_h
     29 
     30 #if ENABLE(XPATH)
     31 
     32 #include "PlatformString.h"
     33 #include "XPathNodeSet.h"
     34 
     35 namespace WebCore {
     36 
     37     namespace XPath {
     38 
     39         class ValueData : public RefCounted<ValueData> {
     40         public:
     41             static PassRefPtr<ValueData> create() { return adoptRef(new ValueData); }
     42             static PassRefPtr<ValueData> create(const NodeSet& nodeSet) { return adoptRef(new ValueData(nodeSet)); }
     43             static PassRefPtr<ValueData> create(const String& string) { return adoptRef(new ValueData(string)); }
     44 
     45             NodeSet m_nodeSet;
     46             String m_string;
     47 
     48         private:
     49             ValueData() { }
     50             ValueData(const NodeSet& nodeSet) : m_nodeSet(nodeSet) { }
     51             ValueData(const String& string) : m_string(string) { }
     52         };
     53 
     54         // Copying Value objects makes their data partially shared, so care has to be taken when dealing with copies.
     55         class Value {
     56         public:
     57             enum Type { NodeSetValue, BooleanValue, NumberValue, StringValue };
     58 
     59             Value(unsigned value) : m_type(NumberValue), m_bool(false), m_number(value) {}
     60             Value(unsigned long value) : m_type(NumberValue), m_bool(false), m_number(value) {}
     61             Value(double value) : m_type(NumberValue), m_bool(false), m_number(value) {}
     62 
     63             Value(const char* value) : m_type(StringValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) {}
     64             Value(const String& value) : m_type(StringValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) {}
     65             Value(const NodeSet& value) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) {}
     66             Value(Node* value) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create()) { m_data->m_nodeSet.append(value); }
     67 
     68             // This is needed to safely implement constructing from bool - with normal function overloading, any pointer type would match.
     69             template<typename T> Value(T);
     70 
     71             static const struct AdoptTag {} adopt;
     72             Value(NodeSet& value, const AdoptTag&) : m_type(NodeSetValue), m_bool(false), m_number(0),  m_data(ValueData::create()) { value.swap(m_data->m_nodeSet); }
     73 
     74             Type type() const { return m_type; }
     75 
     76             bool isNodeSet() const { return m_type == NodeSetValue; }
     77             bool isBoolean() const { return m_type == BooleanValue; }
     78             bool isNumber() const { return m_type == NumberValue; }
     79             bool isString() const { return m_type == StringValue; }
     80 
     81             const NodeSet& toNodeSet() const;
     82             NodeSet& modifiableNodeSet();
     83             bool toBoolean() const;
     84             double toNumber() const;
     85             String toString() const;
     86 
     87         private:
     88             Type m_type;
     89             bool m_bool;
     90             double m_number;
     91             RefPtr<ValueData> m_data;
     92         };
     93 
     94         template<>
     95         inline Value::Value(bool value)
     96             : m_type(BooleanValue)
     97             , m_bool(value)
     98             , m_number(0)
     99         {
    100         }
    101     }
    102 }
    103 
    104 #endif // ENABLE(XPATH)
    105 
    106 #endif // XPath_Value_H
    107