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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.dht;
import java.util.Collections;
import java.util.List;
import org.apache.cassandra.utils.Pair;
/**
* AbstractBounds containing neither of its endpoints: (left, right). Used by {@code CQL key > X AND key < Y} range scans.
*/
public class ExcludingBounds> extends AbstractBounds
{
public ExcludingBounds(T left, T right)
{
super(left, right);
// unlike a Range, an ExcludingBounds may not wrap, nor be empty
assert !strictlyWrapsAround(left, right) && (right.isMinimum() || left.compareTo(right) != 0) : "(" + left + "," + right + ")";
}
public boolean contains(T position)
{
return Range.contains(left, right, position) && !right.equals(position);
}
public Pair, AbstractBounds> split(T position)
{
assert contains(position) || left.equals(position);
if (left.equals(position))
return null;
AbstractBounds lb = new Range(left, position);
AbstractBounds rb = new ExcludingBounds(position, right);
return Pair.create(lb, rb);
}
public boolean inclusiveLeft()
{
return false;
}
public boolean inclusiveRight()
{
return false;
}
public List> unwrap()
{
// ExcludingBounds objects never wrap
return Collections.>singletonList(this);
}
@Override
public boolean equals(Object o)
{
if (!(o instanceof ExcludingBounds))
return false;
ExcludingBounds rhs = (ExcludingBounds)o;
return left.equals(rhs.left) && right.equals(rhs.right);
}
@Override
public String toString()
{
return "(" + left + "," + right + ")";
}
protected String getOpeningString()
{
return "(";
}
protected String getClosingString()
{
return ")";
}
public boolean isStartInclusive()
{
return false;
}
public boolean isEndInclusive()
{
return false;
}
public AbstractBounds withNewRight(T newRight)
{
return new ExcludingBounds(left, newRight);
}
}