// Copyright 2017 JanusGraph Authors
//
// 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.

package org.janusgraph.diskstorage.keycolumnvalue;

import com.google.common.base.Preconditions;
import org.janusgraph.diskstorage.BackendException;
import org.janusgraph.diskstorage.Entry;
import org.janusgraph.diskstorage.EntryList;
import org.janusgraph.diskstorage.StaticBuffer;
import java.util.List;
import java.util.Map;

/**
 * Wraps a {@link org.janusgraph.diskstorage.keycolumnvalue.KeyColumnValueStore} as a proxy as a basis for
 * other wrappers
 *
 * @author Matthias Bröcheler (me@matthiasb.com);
 */
public class KCVSProxy implements KeyColumnValueStore {

    protected final KeyColumnValueStore store;

    public KCVSProxy(KeyColumnValueStore store) {
        Preconditions.checkArgument(store!=null);
        this.store = store;
    }

    protected StoreTransaction unwrapTx(StoreTransaction txh) {
        return txh;
    }

    @Override
    public void close() throws BackendException {
        store.close();
    }

    @Override
    public void acquireLock(StaticBuffer key, StaticBuffer column, StaticBuffer expectedValue,
                            StoreTransaction txh) throws BackendException {
        store.acquireLock(key,column,expectedValue,unwrapTx(txh));
    }

    @Override
    public KeyIterator getKeys(KeyRangeQuery keyQuery, StoreTransaction txh) throws BackendException {
        return store.getKeys(keyQuery, unwrapTx(txh));
    }

    @Override
    public KeyIterator getKeys(SliceQuery columnQuery, StoreTransaction txh) throws BackendException {
        return store.getKeys(columnQuery, unwrapTx(txh));
    }

    @Override
    public String getName() {
        return store.getName();
    }

    @Override
    public void mutate(StaticBuffer key, List<Entry> additions, List<StaticBuffer> deletions, StoreTransaction txh) throws BackendException {
        store.mutate(key, additions, deletions, unwrapTx(txh));
    }

    @Override
    public EntryList getSlice(KeySliceQuery query, StoreTransaction txh) throws BackendException {
        return store.getSlice(query, unwrapTx(txh));
    }

    @Override
    public Map<StaticBuffer,EntryList> getSlice(List<StaticBuffer> keys, SliceQuery query, StoreTransaction txh) throws BackendException {
        return store.getSlice(keys, query, unwrapTx(txh));
    }
}