shell/src/main/java/org/apache/accumulo/shell/commands/MaxRowCommand.java

/*
 * 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.shell.commands;

import org.apache.accumulo.core.data.Range;
import org.apache.accumulo.core.security.Authorizations;
import org.apache.accumulo.core.util.interpret.ScanInterpreter;
import org.apache.accumulo.shell.Shell;
import org.apache.commons.cli.CommandLine;
import org.apache.hadoop.io.Text;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MaxRowCommand extends ScanCommand {

  private static final Logger log = LoggerFactory.getLogger(MaxRowCommand.class);

  @Override
  public int execute(final String fullCommand, final CommandLine cl, final Shell shellState)
      throws Exception {
    final String tableName = OptUtil.getTableOpt(cl, shellState);

    final ScanInterpreter interpeter = getInterpreter(cl, tableName, shellState);

    final Range range = getRange(cl, interpeter);
    final Authorizations auths = getAuths(cl, shellState);
    final Text startRow = range.getStartKey() == null ? null : range.getStartKey().getRow();
    final Text endRow = range.getEndKey() == null ? null : range.getEndKey().getRow();

    try {
      final Text max = shellState.getConnector().tableOperations().getMaxRow(tableName, auths,
          startRow, range.isStartKeyInclusive(), endRow, range.isEndKeyInclusive());
      if (max != null) {
        shellState.getReader().println(max.toString());
      }
    } catch (Exception e) {
      log.debug("Could not get shell state.", e);
    }

    return 0;
  }

  @Override
  public String description() {
    return "finds the max row in a table within a given range";
  }
}