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 { 37 WTF_MAKE_FAST_ALLOCATED; 38 public: 39 static IdentifierRep* get(int); 40 static IdentifierRep* get(const char*); 41 42 static bool isValid(IdentifierRep*); 43 44 bool isString() const { return m_isString; } 45 46 int number() const { return m_isString ? 0 : m_value.m_number; } 47 const char* string() const { return m_isString ? m_value.m_string : 0; } 48 49 private: 50 IdentifierRep(int number) 51 : m_isString(false) 52 { 53 m_value.m_number = number; 54 } 55 56 IdentifierRep(const char* name) 57 : m_isString(true) 58 { 59 m_value.m_string = fastStrDup(name); 60 } 61 62 ~IdentifierRep() 63 { 64 // IdentifierReps should never be deleted. 65 ASSERT_NOT_REACHED(); 66 } 67 68 union { 69 const char* m_string; 70 int m_number; 71 } m_value; 72 bool m_isString; 73 }; 74 75 } // namespace WebCore 76 77 #endif // IdentifierRep_h 78
