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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.phoenix.schema;

import org.apache.hadoop.hbase.regionserver.ConstantSizeRegionSplitPolicy;
import org.apache.phoenix.util.SchemaUtil;

public abstract class SplitOnLeadingVarCharColumnsPolicy extends ConstantSizeRegionSplitPolicy {
    abstract protected int getColumnToSplitAt();
    
    protected final byte[] getSplitPoint(byte[] splitPoint) {
        int offset = SchemaUtil.getVarCharLength(splitPoint, 0, splitPoint.length, getColumnToSplitAt());
        // Only split between leading columns indicated.
        if (offset == splitPoint.length) {
            return splitPoint;
        }
        // Otherwise, an attempt is being made to split in the middle of a table.
        // Just return a split point at the boundary of the first two columns instead
        byte[] newSplitPoint = new byte[offset + 1];
        System.arraycopy(splitPoint, 0, newSplitPoint, 0, offset+1);
        return newSplitPoint;
    }
    
    @Override
    protected final byte[] getSplitPoint() {
        return getSplitPoint(super.getSplitPoint());
    }
}