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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 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.
This Filter checks the visibility expression with each KV against visibility labels associated with the scan. Based on the check the KV is included in the scan result or gets filtered out.
  private final Map<ByteRangeIntegercfVsMaxVersions;
  private final ByteRange curFamily;
  private final ByteRange curQualifier;
  private int curFamilyMaxVersions;
  private int curQualMetVersions;
      Map<ByteRangeIntegercfVsMaxVersions) {
    this. = expEvaluator;
    this. = cfVsMaxVersions;
    this. = new SimpleByteRange();
    this. = new SimpleByteRange();
  public ReturnCode filterKeyValue(Cell cellthrows IOException {
    if (.getBytes() == null
        || (Bytes.compareTo(.getBytes(), .getOffset(), .getLength(),
            cell.getFamilyArray(), cell.getFamilyOffset(), cell.getFamilyLength()) != 0)) {
      .set(cell.getFamilyArray(), cell.getFamilyOffset(), cell.getFamilyLength());
      // For this family, all the columns can have max of curFamilyMaxVersions versions. No need to
      // consider the older versions for visibility label check.
      // Ideally this should have been done at a lower layer by HBase (?)
      // Family is changed. Just unset curQualifier.
    if (.getBytes() == null
        || (Bytes.compareTo(.getBytes(), .getOffset(),
            .getLength(), cell.getQualifierArray(), cell.getQualifierOffset(),
            cell.getQualifierLength()) != 0)) {
       = 0;
      return .;
    return this..evaluate(cell) ? . : .;
  public void reset() throws IOException {
    this. = 0;
    this. = 0;
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