XPathValue.h revision cad810f21b803229eb11403f9209855525a25d57 
1/*
2 * Copyright 2005 Frerich Raabe <raabe@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
35namespace 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