org.apache.cassandra.index.sai.memory.FilteringInMemoryKeyRangeIterator Maven / Gradle / Ivy

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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.cassandra.index.sai.memory;

import java.util.SortedSet;

import org.apache.cassandra.db.PartitionPosition;
import org.apache.cassandra.dht.AbstractBounds;
import org.apache.cassandra.index.sai.utils.PrimaryKey;

/**
 * An {@link InMemoryKeyRangeIterator} that filters the returned {@link PrimaryKey}s based on the provided keyRange
 */
public class FilteringInMemoryKeyRangeIterator extends InMemoryKeyRangeIterator
{
    private final AbstractBounds keyRange;

    public FilteringInMemoryKeyRangeIterator(SortedSet keys, AbstractBounds keyRange)
    {
        super(keys);
        this.keyRange = keyRange;
    }

    @Override
    protected PrimaryKey computeNext()
    {
        PrimaryKey key = computeNextKey();
        while (key != null && !keyRange.contains(key.partitionKey()))
            key = computeNextKey();
        return key == null ? endOfData() : key;
    }
}