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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
*
* 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.curator.utils;
import com.google.common.collect.Lists;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.ZooKeeper;
import java.util.Collections;
import java.util.List;
public class ZKPaths
{
/**
* Apply the namespace to the given path
*
* @param namespace namespace (can be null)
* @param path path
* @return adjusted path
*/
public static String fixForNamespace(String namespace, String path)
{
if ( namespace != null )
{
return makePath(namespace, path);
}
return path;
}
/**
* Given a full path, return the node name. i.e. "/one/two/three" will return "three"
*
* @param path the path
* @return the node
*/
public static String getNodeFromPath(String path)
{
PathUtils.validatePath(path);
int i = path.lastIndexOf('/');
if ( i < 0 )
{
return path;
}
if ( (i + 1) >= path.length() )
{
return "";
}
return path.substring(i + 1);
}
public static class PathAndNode
{
private final String path;
private final String node;
public PathAndNode(String path, String node)
{
this.path = path;
this.node = node;
}
public String getPath()
{
return path;
}
public String getNode()
{
return node;
}
}
/**
* Given a full path, return the node name and its path. i.e. "/one/two/three" will return {"/one/two", "three"}
*
* @param path the path
* @return the node
*/
public static PathAndNode getPathAndNode(String path)
{
PathUtils.validatePath(path);
int i = path.lastIndexOf('/');
if ( i < 0 )
{
return new PathAndNode(path, "");
}
if ( (i + 1) >= path.length() )
{
return new PathAndNode("/", "");
}
String node = path.substring(i + 1);
String parentPath = (i > 0) ? path.substring(0, i) : "/";
return new PathAndNode(parentPath, node);
}
/**
* Make sure all the nodes in the path are created. NOTE: Unlike File.mkdirs(), Zookeeper doesn't distinguish
* between directories and files. So, every node in the path is created. The data for each node is an empty blob
*
* @param zookeeper the client
* @param path path to ensure
* @throws InterruptedException thread interruption
* @throws org.apache.zookeeper.KeeperException
* Zookeeper errors
*/
public static void mkdirs(ZooKeeper zookeeper, String path)
throws InterruptedException, KeeperException
{
mkdirs(zookeeper, path, true);
}
/**
* Make sure all the nodes in the path are created. NOTE: Unlike File.mkdirs(), Zookeeper doesn't distinguish
* between directories and files. So, every node in the path is created. The data for each node is an empty blob
*
* @param zookeeper the client
* @param path path to ensure
* @param makeLastNode if true, all nodes are created. If false, only the parent nodes are created
* @throws InterruptedException thread interruption
* @throws org.apache.zookeeper.KeeperException
* Zookeeper errors
*/
public static void mkdirs(ZooKeeper zookeeper, String path, boolean makeLastNode)
throws InterruptedException, KeeperException
{
PathUtils.validatePath(path);
int pos = 1; // skip first slash, root is guaranteed to exist
do
{
pos = path.indexOf('/', pos + 1);
if ( pos == -1 )
{
if ( makeLastNode )
{
pos = path.length();
}
else
{
break;
}
}
String subPath = path.substring(0, pos);
if ( zookeeper.exists(subPath, false) == null )
{
try
{
zookeeper.create(subPath, new byte[0], ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
}
catch ( KeeperException.NodeExistsException e )
{
// ignore... someone else has created it since we checked
}
}
}
while ( pos < path.length() );
}
/**
* Return the children of the given path sorted by sequence number
*
* @param zookeeper the client
* @param path the path
* @return sorted list of children
* @throws InterruptedException thread interruption
* @throws org.apache.zookeeper.KeeperException
* zookeeper errors
*/
public static List getSortedChildren(ZooKeeper zookeeper, String path)
throws InterruptedException, KeeperException
{
List children = zookeeper.getChildren(path, false);
List sortedList = Lists.newArrayList(children);
Collections.sort(sortedList);
return sortedList;
}
/**
* Given a parent path and a child node, create a combined full path
*
* @param parent the parent
* @param child the child
* @return full path
*/
public static String makePath(String parent, String child)
{
StringBuilder path = new StringBuilder();
if ( !parent.startsWith("/") )
{
path.append("/");
}
path.append(parent);
if ( (child == null) || (child.length() == 0) )
{
return path.toString();
}
if ( !parent.endsWith("/") )
{
path.append("/");
}
if ( child.startsWith("/") )
{
path.append(child.substring(1));
}
else
{
path.append(child);
}
return path.toString();
}
private ZKPaths()
{
}
}
