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An interactive shell for accessing Apache Accumulo via a command line interface.

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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
 *
 *   https://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 java.util.Iterator;
import java.util.List;

import org.apache.accumulo.core.client.AccumuloException;
import org.apache.accumulo.core.client.admin.InstanceOperations;

class PingIterator implements Iterator {

  private Iterator iter;
  private InstanceOperations instanceOps;

  PingIterator(List tservers, InstanceOperations instanceOps) {
    iter = tservers.iterator();
    this.instanceOps = instanceOps;
  }

  @Override
  public boolean hasNext() {
    return iter.hasNext();
  }

  @Override
  public String next() {
    String tserver = iter.next();

    try {
      instanceOps.ping(tserver);
    } catch (AccumuloException e) {
      return tserver + " ERROR " + e.getMessage();
    }

    return tserver + " OK";
  }

  @Override
  public void remove() {
    throw new UnsupportedOperationException();
  }

}