com.palantir.atlasdb.keyvalue.cassandra.HistoryExtractor.java Source code

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Here is the source code for com.palantir.atlasdb.keyvalue.cassandra.HistoryExtractor.java

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/**
 * Copyright 2015 Palantir Technologies
 *
 * Licensed under the BSD-3 License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://opensource.org/licenses/BSD-3-Clause
 *
 * 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 com.palantir.atlasdb.keyvalue.cassandra;

import java.util.Map;
import java.util.Set;

import com.google.common.base.Supplier;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimaps;
import com.google.common.collect.SetMultimap;
import com.palantir.atlasdb.keyvalue.api.Cell;
import com.palantir.atlasdb.keyvalue.api.ColumnSelection;
import com.palantir.atlasdb.keyvalue.api.Value;

class HistoryExtractor extends ResultsExtractor<SetMultimap<Cell, Value>, Set<Value>> {

    static final Supplier<ResultsExtractor<SetMultimap<Cell, Value>, Set<Value>>> SUPPLIER = new Supplier<ResultsExtractor<SetMultimap<Cell, Value>, Set<Value>>>() {
        @Override
        public ResultsExtractor<SetMultimap<Cell, Value>, Set<Value>> get() {
            return new HistoryExtractor(HashMultimap.<Cell, Value>create());
        }
    };

    public HistoryExtractor(SetMultimap<Cell, Value> collector) {
        super(collector);
    }

    @Override
    public void internalExtractResult(long startTs, ColumnSelection selection, byte[] row, byte[] col, byte[] val,
            long ts) {
        if (ts < startTs && selection.contains(col)) {
            collector.put(Cell.create(row, col), Value.create(val, ts));
        }
    }

    @Override
    public Map<Cell, Set<Value>> asMap() {
        return Multimaps.asMap(collector);
    }
}