src/aosp/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.cc

/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.h"

#include <stdint.h>

#include "defines.h"
#include "suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h"
#include "suggest/policyimpl/dictionary/patricia_trie_policy.h"
#include "suggest/policyimpl/dictionary/utils/format_utils.h"
#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"

namespace latinime {

/* static */ DictionaryStructureWithBufferPolicy *DictionaryStructureWithBufferPolicyFactory
        ::newDictionaryStructureWithBufferPolicy(const char *const path, const int bufOffset,
                const int size, const bool isUpdatable) {
    // Allocated buffer in MmapedBuffer::openBuffer() will be freed in the destructor of
    // impl classes of DictionaryStructureWithBufferPolicy.
    const MmappedBuffer *const mmapedBuffer = MmappedBuffer::openBuffer(path, bufOffset, size,
            isUpdatable);
    if (!mmapedBuffer) {
        return 0;
    }
    switch (FormatUtils::detectFormatVersion(mmapedBuffer->getBuffer(),
            mmapedBuffer->getBufferSize())) {
        case FormatUtils::VERSION_2:
            return new PatriciaTriePolicy(mmapedBuffer);
        case FormatUtils::VERSION_3:
            return new DynamicPatriciaTriePolicy(mmapedBuffer);
        default:
            AKLOGE("DICT: dictionary format is unknown, bad magic number");
            delete mmapedBuffer;
            ASSERT(false);
            return 0;
    }
}

} // namespace latinime