/*
* 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.accumulo.core.client.summary.summarizers;
import java.util.function.UnaryOperator;
import org.apache.accumulo.core.client.admin.TableOperations;
import org.apache.accumulo.core.client.summary.CountingSummarizer;
import org.apache.accumulo.core.data.ArrayByteSequence;
import org.apache.accumulo.core.data.ByteSequence;
/**
* Counts column visibility labels. Leverages super class to defend against too many. This class is useful for discovering what column visibilities are present
* when the expected number of visibilities is small.
*
* @since 2.0.0
*
* @see TableOperations#addSummarizers(String, org.apache.accumulo.core.client.summary.SummarizerConfiguration...)
* @see TableOperations#summaries(String)
*/
public class VisibilitySummarizer extends CountingSummarizer<ByteSequence> {
@Override
protected UnaryOperator<ByteSequence> copier() {
return ArrayByteSequence::new;
}
@Override
protected Converter<ByteSequence> converter() {
return (k, v, c) -> c.accept(k.getColumnVisibilityData());
}
}