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      1 /*
      2  * Copyright (C) 2011 Google 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  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "modules/indexeddb/IDBKey.h"
     28 
     29 namespace blink {
     30 
     31 IDBKey::~IDBKey()
     32 {
     33 }
     34 
     35 void IDBKey::trace(Visitor* visitor)
     36 {
     37     visitor->trace(m_array);
     38 }
     39 
     40 bool IDBKey::isValid() const
     41 {
     42     if (m_type == InvalidType)
     43         return false;
     44 
     45     if (m_type == ArrayType) {
     46         for (size_t i = 0; i < m_array.size(); i++) {
     47             if (!m_array[i]->isValid())
     48                 return false;
     49         }
     50     }
     51 
     52     return true;
     53 }
     54 
     55 // Safely compare numbers (signed/unsigned ints/floats/doubles).
     56 template <typename T>
     57 static int compareNumbers(const T& a, const T& b)
     58 {
     59     if (a < b)
     60         return -1;
     61     if (b < a)
     62         return 1;
     63     return 0;
     64 }
     65 
     66 int IDBKey::compare(const IDBKey* other) const
     67 {
     68     ASSERT(other);
     69     if (m_type != other->m_type)
     70         return m_type > other->m_type ? -1 : 1;
     71 
     72     switch (m_type) {
     73     case ArrayType:
     74         for (size_t i = 0; i < m_array.size() && i < other->m_array.size(); ++i) {
     75             if (int result = m_array[i]->compare(other->m_array[i].get()))
     76                 return result;
     77         }
     78         return compareNumbers(m_array.size(), other->m_array.size());
     79     case BinaryType:
     80         if (int result = memcmp(m_binary->data(), other->m_binary->data(), std::min(m_binary->size(), other->m_binary->size())))
     81             return result < 0 ? -1 : 1;
     82         return compareNumbers(m_binary->size(), other->m_binary->size());
     83     case StringType:
     84         return codePointCompare(m_string, other->m_string);
     85     case DateType:
     86     case NumberType:
     87         return compareNumbers(m_number, other->m_number);
     88     case InvalidType:
     89     case MinType:
     90         ASSERT_NOT_REACHED();
     91         return 0;
     92     }
     93 
     94     ASSERT_NOT_REACHED();
     95     return 0;
     96 }
     97 
     98 bool IDBKey::isLessThan(const IDBKey* other) const
     99 {
    100     ASSERT(other);
    101     return compare(other) == -1;
    102 }
    103 
    104 bool IDBKey::isEqual(const IDBKey* other) const
    105 {
    106     if (!other)
    107         return false;
    108 
    109     return !compare(other);
    110 }
    111 
    112 } // namespace blink
    113