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A common base library for Apache Accumulo servers.
There is a newer version: 3.0.0
/*
 * 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.server.util;

import static java.nio.charset.StandardCharsets.UTF_8;

import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.core.zookeeper.ZooUtil;
import org.apache.accumulo.fate.zookeeper.ZooUtil.NodeExistsPolicy;
import org.apache.accumulo.fate.zookeeper.ZooUtil.NodeMissingPolicy;
import org.apache.accumulo.server.client.HdfsZooInstance;
import org.apache.accumulo.server.zookeeper.ZooReaderWriter;
import org.apache.zookeeper.KeeperException;

public class NamespacePropUtil {
  public static boolean setNamespaceProperty(String namespaceId, String property, String value) throws KeeperException, InterruptedException {
    if (!isPropertyValid(property, value))
      return false;

    // create the zk node for per-namespace properties for this namespace if it doesn't already exist
    String zkNamespacePath = getPath(namespaceId);
    ZooReaderWriter.getInstance().putPersistentData(zkNamespacePath, new byte[0], NodeExistsPolicy.SKIP);

    // create the zk node for this property and set it's data to the specified value
    String zPath = zkNamespacePath + "/" + property;
    ZooReaderWriter.getInstance().putPersistentData(zPath, value.getBytes(UTF_8), NodeExistsPolicy.OVERWRITE);

    return true;
  }

  public static boolean isPropertyValid(String property, String value) {
    Property p = Property.getPropertyByKey(property);
    if ((p != null && !p.getType().isValidFormat(value)) || !Property.isValidTablePropertyKey(property))
      return false;

    return true;
  }

  public static void removeNamespaceProperty(String namespaceId, String property) throws InterruptedException, KeeperException {
    String zPath = getPath(namespaceId) + "/" + property;
    ZooReaderWriter.getInstance().recursiveDelete(zPath, NodeMissingPolicy.SKIP);
  }

  private static String getPath(String namespaceId) {
    return ZooUtil.getRoot(HdfsZooInstance.getInstance()) + Constants.ZNAMESPACES + "/" + namespaceId + Constants.ZNAMESPACE_CONF;
  }
}