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      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