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/*
* 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 "config.h"
#include "LevelDBDatabase.h"
#if ENABLE(LEVELDB)
#include "LevelDBComparator.h"
#include "LevelDBIterator.h"
#include "LevelDBSlice.h"
#include <leveldb/comparator.h>
#include <leveldb/db.h>
#include <leveldb/slice.h>
#include <string>
#include <wtf/PassOwnPtr.h>
#include <wtf/text/CString.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
static leveldb::Slice makeSlice(const Vector<char>& value)
{
return leveldb::Slice(value.data(), value.size());
}
static leveldb::Slice makeSlice(const LevelDBSlice& s)
{
return leveldb::Slice(s.begin(), s.end() - s.begin());
}
static LevelDBSlice makeLevelDBSlice(const leveldb::Slice& s)
{
return LevelDBSlice(s.data(), s.data() + s.size());
}
static Vector<char> makeVector(const std::string& s)
{
Vector<char> res;
res.append(s.c_str(), s.length());
return res;
}
namespace {
class ComparatorAdapter : public leveldb::Comparator {
public:
ComparatorAdapter(const LevelDBComparator* comparator)
: m_comparator(comparator)
{
}
virtual int Compare(const leveldb::Slice& a, const leveldb::Slice& b) const
{
return m_comparator->compare(makeLevelDBSlice(a), makeLevelDBSlice(b));
}
virtual const char* Name() const { return m_comparator->name(); }
// FIXME: Support the methods below in the future.
virtual void FindShortestSeparator(std::string* start, const leveldb::Slice& limit) const { }
virtual void FindShortSuccessor(std::string* key) const { }
private:
const LevelDBComparator* m_comparator;
};
}
LevelDBDatabase::LevelDBDatabase()
: m_db(0)
{
}
LevelDBDatabase::~LevelDBDatabase()
{
}
LevelDBDatabase* LevelDBDatabase::open(const String& fileName, const LevelDBComparator* comparator)
{
OwnPtr<ComparatorAdapter> comparatorAdapter(new ComparatorAdapter(comparator));
LevelDBDatabase* result = new LevelDBDatabase();
leveldb::Options options;
options.comparator = comparatorAdapter.get();
options.create_if_missing = true;
leveldb::DB* db;
leveldb::Status s = leveldb::DB::Open(options, fileName.utf8().data(), &db);
if (!s.ok()) {
delete result;
return 0;
}
result->m_db = WTF::adoptPtr(db);
result->m_comparatorAdapter = comparatorAdapter.release();
return result;
}
bool LevelDBDatabase::put(const LevelDBSlice& key, const Vector<char>& value)
{
leveldb::WriteOptions writeOptions;
writeOptions.sync = false;
return m_db->Put(writeOptions, makeSlice(key), makeSlice(value)).ok();
}
bool LevelDBDatabase::remove(const LevelDBSlice& key)
{
leveldb::WriteOptions writeOptions;
writeOptions.sync = false;
return m_db->Delete(writeOptions, makeSlice(key)).ok();
}
bool LevelDBDatabase::get(const LevelDBSlice& key, Vector<char>& value)
{
std::string result;
if (!m_db->Get(leveldb::ReadOptions(), makeSlice(key), &result).ok())
return false;
value = makeVector(result);
return true;
}
LevelDBIterator* LevelDBDatabase::newIterator()
{
leveldb::Iterator* i = m_db->NewIterator(leveldb::ReadOptions());
if (!i) // FIXME: Double check if we actually need to check this.
return 0;
return new LevelDBIterator(i);
}
} // namespace WebCore
#endif // ENABLE(LEVELDB)
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