third_party/WebKit/Source/modules/indexeddb/IDBKey.cpp

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "modules/indexeddb/IDBKey.h"

namespace blink {

IDBKey::~IDBKey()
{
}

DEFINE_TRACE(IDBKey)
{
    visitor->trace(m_array);
}

bool IDBKey::isValid() const
{
    if (m_type == InvalidType)
        return false;

    if (m_type == ArrayType) {
        for (size_t i = 0; i < m_array.size(); i++) {
            if (!m_array[i]->isValid())
                return false;
        }
    }

    return true;
}

// Safely compare numbers (signed/unsigned ints/floats/doubles).
template <typename T>
static int compareNumbers(const T& a, const T& b)
{
    if (a < b)
        return -1;
    if (b < a)
        return 1;
    return 0;
}

int IDBKey::compare(const IDBKey* other) const
{
    ASSERT(other);
    if (m_type != other->m_type)
        return m_type > other->m_type ? -1 : 1;

    switch (m_type) {
    case ArrayType:
        for (size_t i = 0; i < m_array.size() && i < other->m_array.size(); ++i) {
            if (int result = m_array[i]->compare(other->m_array[i].get()))
                return result;
        }
        return compareNumbers(m_array.size(), other->m_array.size());
    case BinaryType:
        if (int result = memcmp(m_binary->data(), other->m_binary->data(), std::min(m_binary->size(), other->m_binary->size())))
            return result < 0 ? -1 : 1;
        return compareNumbers(m_binary->size(), other->m_binary->size());
    case StringType:
        return codePointCompare(m_string, other->m_string);
    case DateType:
    case NumberType:
        return compareNumbers(m_number, other->m_number);
    case InvalidType:
    case MinType:
        ASSERT_NOT_REACHED();
        return 0;
    }

    ASSERT_NOT_REACHED();
    return 0;
}

bool IDBKey::isLessThan(const IDBKey* other) const
{
    ASSERT(other);
    return compare(other) == -1;
}

bool IDBKey::isEqual(const IDBKey* other) const
{
    if (!other)
        return false;

    return !compare(other);
}

} // namespace blink