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 #include "config.h" 27 #include "IdentifierRep.h" 28 #include "JSDOMBinding.h" 29 30 #include "PlatformString.h" 31 #include <runtime/UString.h> 32 #include <wtf/HashMap.h> 33 #include <wtf/StdLibExtras.h> 34 35 using namespace JSC; 36 37 namespace WebCore { 38 39 typedef HashSet<IdentifierRep*> IdentifierSet; 40 41 static IdentifierSet& identifierSet() 42 { 43 DEFINE_STATIC_LOCAL(IdentifierSet, identifierSet, ()); 44 return identifierSet; 45 } 46 47 typedef HashMap<int, IdentifierRep*> IntIdentifierMap; 48 49 static IntIdentifierMap& intIdentifierMap() 50 { 51 DEFINE_STATIC_LOCAL(IntIdentifierMap, intIdentifierMap, ()); 52 return intIdentifierMap; 53 } 54 55 IdentifierRep* IdentifierRep::get(int intID) 56 { 57 if (intID == 0 || intID == -1) { 58 static IdentifierRep* negativeOneAndZeroIdentifiers[2]; 59 60 IdentifierRep* identifier = negativeOneAndZeroIdentifiers[intID + 1]; 61 if (!identifier) { 62 identifier = new IdentifierRep(intID); 63 64 negativeOneAndZeroIdentifiers[intID + 1] = identifier; 65 } 66 67 return identifier; 68 } 69 70 pair<IntIdentifierMap::iterator, bool> result = intIdentifierMap().add(intID, 0); 71 if (result.second) { 72 ASSERT(!result.first->second); 73 result.first->second = new IdentifierRep(intID); 74 75 identifierSet().add(result.first->second); 76 } 77 78 return result.first->second; 79 } 80 81 typedef HashMap<RefPtr<StringImpl>, IdentifierRep*> StringIdentifierMap; 82 83 static StringIdentifierMap& stringIdentifierMap() 84 { 85 DEFINE_STATIC_LOCAL(StringIdentifierMap, stringIdentifierMap, ()); 86 return stringIdentifierMap; 87 } 88 89 IdentifierRep* IdentifierRep::get(const char* name) 90 { 91 ASSERT(name); 92 if (!name) 93 return 0; 94 95 UString string = stringToUString(String::fromUTF8WithLatin1Fallback(name, strlen(name))); 96 pair<StringIdentifierMap::iterator, bool> result = stringIdentifierMap().add(string.impl(), 0); 97 if (result.second) { 98 ASSERT(!result.first->second); 99 result.first->second = new IdentifierRep(name); 100 101 identifierSet().add(result.first->second); 102 } 103 104 return result.first->second; 105 } 106 107 bool IdentifierRep::isValid(IdentifierRep* identifier) 108 { 109 return identifierSet().contains(identifier); 110 } 111 112 } // namespace WebCore 113