| /** |
| * 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.hcatalog.hbase.snapshot.lock; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Represents an ephemeral znode name which has an ordered sequence number |
| * and can be sorted in order |
| * This class has been used as-is from the zookeeper 3.4.0 recipes with a |
| * change in package name. |
| */ |
| public class ZNodeName implements Comparable<ZNodeName> { |
| private final String name; |
| private String prefix; |
| private int sequence = -1; |
| private static final Logger LOG = LoggerFactory.getLogger(ZNodeName.class); |
| |
| public ZNodeName(String name) { |
| if (name == null) { |
| throw new NullPointerException("id cannot be null"); |
| } |
| this.name = name; |
| this.prefix = name; |
| int idx = name.lastIndexOf('-'); |
| if (idx >= 0) { |
| this.prefix = name.substring(0, idx); |
| try { |
| this.sequence = Integer.parseInt(name.substring(idx + 1)); |
| // If an exception occurred we misdetected a sequence suffix, |
| // so return -1. |
| } catch (NumberFormatException e) { |
| LOG.info("Number format exception for " + idx, e); |
| } catch (ArrayIndexOutOfBoundsException e) { |
| LOG.info("Array out of bounds for " + idx, e); |
| } |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return name.toString(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| ZNodeName sequence = (ZNodeName) o; |
| |
| if (!name.equals(sequence.name)) return false; |
| |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| return name.hashCode() + 37; |
| } |
| |
| public int compareTo(ZNodeName that) { |
| int answer = this.prefix.compareTo(that.prefix); |
| if (answer == 0) { |
| int s1 = this.sequence; |
| int s2 = that.sequence; |
| if (s1 == -1 && s2 == -1) { |
| return this.name.compareTo(that.name); |
| } |
| answer = s1 == -1 ? 1 : s2 == -1 ? -1 : s1 - s2; |
| } |
| return answer; |
| } |
| |
| /** |
| * Returns the name of the znode |
| */ |
| public String getName() { |
| return name; |
| } |
| |
| /** |
| * Returns the sequence number |
| */ |
| public int getZNodeName() { |
| return sequence; |
| } |
| |
| /** |
| * Returns the text prefix before the sequence number |
| */ |
| public String getPrefix() { |
| return prefix; |
| } |
| } |