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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.
/*
* 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,
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* See the License for the specific language governing permissions and
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package org.apache.cassandra.index.sai.utils;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
import java.util.TreeSet;
import org.apache.cassandra.db.DecoratedKey;
import org.apache.cassandra.db.ReadCommand;
import org.apache.cassandra.db.RegularAndStaticColumns;
import org.apache.cassandra.db.partitions.PartitionIterator;
import org.apache.cassandra.db.rows.Row;
import org.apache.cassandra.db.rows.RowIterator;
import org.apache.cassandra.db.rows.Unfiltered;
import org.apache.cassandra.schema.TableMetadata;
public class InMemoryPartitionIterator implements PartitionIterator
{
private final ReadCommand command;
private final Iterator>> partitions;
public InMemoryPartitionIterator(ReadCommand command, TreeMap> rowsByPartitions)
{
this.command = command;
this.partitions = rowsByPartitions.entrySet().iterator();
}
@Override
public void close()
{
}
@Override
public boolean hasNext()
{
return partitions.hasNext();
}
@Override
public RowIterator next()
{
return new InMemoryRowIterator(partitions.next());
}
private class InMemoryRowIterator implements RowIterator
{
private final PartitionInfo partitionInfo;
private final Iterator rows;
public InMemoryRowIterator(Map.Entry> rows)
{
this.partitionInfo = rows.getKey();
this.rows = rows.getValue().iterator();
}
@Override
public void close()
{
}
@Override
public boolean hasNext()
{
return rows.hasNext();
}
@Override
public Row next()
{
return (Row) rows.next();
}
@Override
public TableMetadata metadata()
{
return command.metadata();
}
@Override
public boolean isReverseOrder()
{
return command.isReversed();
}
@Override
public RegularAndStaticColumns columns()
{
return command.metadata().regularAndStaticColumns();
}
@Override
public DecoratedKey partitionKey()
{
return partitionInfo.key;
}
@Override
public Row staticRow()
{
return partitionInfo.staticRow;
}
}
}