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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.dht;

import java.util.Collections;
import java.util.List;

import org.apache.cassandra.db.RowPosition;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.Pair;

/**
 * AbstractBounds containing only its left endpoint: [left, right).  Used by CQL key >= X AND key < Y range scans.
 */
public class IncludingExcludingBounds> extends AbstractBounds
{
    public IncludingExcludingBounds(T left, T right)
    {
        this(left, right, StorageService.getPartitioner());
    }

    IncludingExcludingBounds(T left, T right, IPartitioner partitioner)
    {
        super(left, right, partitioner);
        // unlike a Range, an IncludingExcludingBounds may not wrap, nor have
        // right == left unless the right is the min token
        assert left.compareTo(right) < 0 || right.isMinimum(partitioner) : "[" + left + "," + right + ")";
    }

    public boolean contains(T position)
    {
        return (Range.contains(left, right, position) || left.equals(position)) && !right.equals(position);
    }

    public Pair, AbstractBounds> split(T position)
    {
        assert contains(position);
        AbstractBounds lb = new Bounds(left, position, partitioner);
        AbstractBounds rb = new ExcludingBounds(position, right, partitioner);
        return Pair.create(lb, rb);
    }

    public boolean inclusiveLeft()
    {
        return true;
    }

    public boolean inclusiveRight()
    {
        return false;
    }

    public List> unwrap()
    {
        // IncludingExcludingBounds objects never wrap
        return Collections.>singletonList(this);
    }

    @Override
    public boolean equals(Object o)
    {
        if (!(o instanceof IncludingExcludingBounds))
            return false;
        IncludingExcludingBounds rhs = (IncludingExcludingBounds)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 ")";
    }

    /**
     * Compute a bounds of keys corresponding to a given bounds of token.
     */
    private static IncludingExcludingBounds makeRowBounds(Token left, Token right, IPartitioner partitioner)
    {
        return new IncludingExcludingBounds(left.maxKeyBound(partitioner), right.minKeyBound(partitioner), partitioner);
    }

    @SuppressWarnings("unchecked")
    public AbstractBounds toRowBounds()
    {
        return (left instanceof Token) ? makeRowBounds((Token)left, (Token)right, partitioner) : (IncludingExcludingBounds)this;
    }

    @SuppressWarnings("unchecked")
    public AbstractBounds toTokenBounds()
    {
        return (left instanceof RowPosition) ? new IncludingExcludingBounds(((RowPosition)left).getToken(), ((RowPosition)right).getToken(), partitioner) : (IncludingExcludingBounds)this;
    }

    public AbstractBounds withNewRight(T newRight)
    {
        return new IncludingExcludingBounds(left, newRight);
    }
}