1 /* 2 * Copyright (C) 2009 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef IdentifierRep_h 27 #define IdentifierRep_h 28 29 #include <wtf/Assertions.h> 30 #include <wtf/FastAllocBase.h> 31 #include <wtf/StringExtras.h> 32 #include <string.h> 33 34 namespace WebCore { 35 36 class IdentifierRep : public FastAllocBase { 37 public: 38 static IdentifierRep* get(int); 39 static IdentifierRep* get(const char*); 40 41 static bool isValid(IdentifierRep*); 42 43 bool isString() const { return m_isString; } 44 45 int number() const { return m_isString ? 0 : m_value.m_number; } 46 const char* string() const { return m_isString ? m_value.m_string : 0; } 47 48 private: 49 IdentifierRep(int number) 50 : m_isString(false) 51 { 52 m_value.m_number = number; 53 } 54 55 IdentifierRep(const char* name) 56 : m_isString(true) 57 { 58 m_value.m_string = fastStrDup(name); 59 } 60 61 ~IdentifierRep() 62 { 63 // IdentifierReps should never be deleted. 64 ASSERT_NOT_REACHED(); 65 } 66 67 union { 68 const char* m_string; 69 int m_number; 70 } m_value; 71 bool m_isString; 72 }; 73 74 } // namespace WebCore 75 76 #endif // IdentifierRep_h 77
