curator-master/curator-framework/src/main/java/org/apache/curator/framework/imps/NamespaceImpl.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.curator.framework.imps;

import java.util.concurrent.Callable;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.curator.CuratorZookeeperClient;
import org.apache.curator.RetryLoop;
import org.apache.curator.utils.EnsurePath;
import org.apache.curator.utils.PathUtils;
import org.apache.curator.utils.ThreadUtils;
import org.apache.curator.utils.ZKPaths;

class NamespaceImpl {
    private final CuratorFrameworkImpl client;
    private final String namespace;
    private final AtomicBoolean ensurePathNeeded;

    NamespaceImpl(CuratorFrameworkImpl client, String namespace) {
        if (namespace != null) {
            try {
                PathUtils.validatePath("/" + namespace);
            } catch (IllegalArgumentException e) {
                throw new IllegalArgumentException("Invalid namespace: " + namespace + ", " + e.getMessage());
            }
        }

        this.client = client;
        this.namespace = namespace;
        ensurePathNeeded = new AtomicBoolean(namespace != null);
    }

    String getNamespace() {
        return namespace;
    }

    String unfixForNamespace(String path) {
        if ((namespace != null) && (path != null)) {
            String namespacePath = ZKPaths.makePath(namespace, null);
            if (!namespacePath.equals("/") && path.startsWith(namespacePath)) {
                path = (path.length() > namespacePath.length()) ? path.substring(namespacePath.length()) : "/";
            }
        }
        return path;
    }

    String fixForNamespace(String path, boolean isSequential) {
        if (ensurePathNeeded.get()) {
            try {
                final CuratorZookeeperClient zookeeperClient = client.getZookeeperClient();
                RetryLoop.callWithRetry(zookeeperClient, new Callable<Object>() {
                    @Override
                    public Object call() throws Exception {
                        ZKPaths.mkdirs(
                                zookeeperClient.getZooKeeper(),
                                ZKPaths.makePath("/", namespace),
                                true,
                                client.getAclProvider(),
                                true);
                        return null;
                    }
                });
                ensurePathNeeded.set(false);
            } catch (Exception e) {
                ThreadUtils.checkInterrupted(e);
                client.logError("Ensure path threw exception", e);
            }
        }

        return ZKPaths.fixForNamespace(namespace, path, isSequential);
    }

    EnsurePath newNamespaceAwareEnsurePath(String path) {
        return new EnsurePath(fixForNamespace(path, false), client.getAclProvider());
    }
}
