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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,
* 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.view;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import com.google.common.base.MoreObjects;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.index.sai.IndexContext;
import org.apache.cassandra.index.sai.disk.SSTableIndex;
import org.apache.cassandra.index.sai.plan.Expression;
import org.apache.cassandra.index.sai.utils.TypeUtil;
import org.apache.cassandra.utils.Interval;
import org.apache.cassandra.utils.IntervalTree;
public class RangeTermTree
{
private static final Logger logger = LoggerFactory.getLogger(RangeTermTree.class);
protected final ByteBuffer min, max;
protected final AbstractType> comparator;
private final IntervalTree> rangeTree;
private RangeTermTree(ByteBuffer min, ByteBuffer max, IntervalTree> rangeTree, AbstractType> comparator)
{
this.min = min;
this.max = max;
this.rangeTree = rangeTree;
this.comparator = comparator;
}
public List search(Expression e)
{
ByteBuffer minTerm = e.lower == null ? min : e.lower.value.encoded;
ByteBuffer maxTerm = e.upper == null ? max : e.upper.value.encoded;
return rangeTree.search(Interval.create(new Term(minTerm, comparator),
new Term(maxTerm, comparator),
null));
}
static class Builder
{
private final AbstractType> comparator;
private ByteBuffer min, max;
final List> intervals = new ArrayList<>();
protected Builder(AbstractType> comparator)
{
this.comparator = comparator;
}
public final void add(SSTableIndex index)
{
addIndex(index);
min = min == null || TypeUtil.compare(min, index.minTerm(), comparator) > 0 ? index.minTerm() : min;
max = max == null || TypeUtil.compare(max, index.maxTerm(), comparator) < 0 ? index.maxTerm() : max;
}
public void addIndex(SSTableIndex index)
{
Interval interval =
Interval.create(new Term(index.minTerm(), comparator), new Term(index.maxTerm(), comparator), index);
if (logger.isTraceEnabled())
{
IndexContext context = index.getIndexContext();
logger.trace(context.logMessage("Adding index for SSTable {} with minTerm={} and maxTerm={}..."),
index.getSSTable().descriptor,
comparator.compose(index.minTerm()),
comparator.compose(index.maxTerm()));
}
intervals.add(interval);
}
public RangeTermTree build()
{
return new RangeTermTree(min, max, IntervalTree.build(intervals), comparator);
}
}
/**
* This is required since IntervalTree doesn't support custom Comparator
* implementations and relied on items to be comparable which "raw" terms are not.
*/
protected static class Term implements Comparable
{
private final ByteBuffer term;
private final AbstractType> comparator;
Term(ByteBuffer term, AbstractType> comparator)
{
this.term = term;
this.comparator = comparator;
}
@Override
public int compareTo(Term o)
{
return TypeUtil.compare(term, o.term, comparator);
}
@Override
public String toString()
{
return MoreObjects.toStringHelper(this).add("term", comparator.getString(term)).toString();
}
}
}
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