/**
 * 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.ensemble.fixed;

import com.google.common.base.Preconditions;
import org.apache.curator.ensemble.EnsembleProvider;
import java.io.IOException;

/**
 * Standard ensemble provider that wraps a fixed connection string
 */
public class FixedEnsembleProvider implements EnsembleProvider
{
    private final String connectionString;

    /**
     * The connection string to use
     *
     * @param connectionString connection string
     */
    public FixedEnsembleProvider(String connectionString)
    {
        this.connectionString = Preconditions.checkNotNull(connectionString, "connectionString cannot be null");
    }

    @Override
    public void start() throws Exception
    {
        // NOP
    }

    @Override
    public void close() throws IOException
    {
        // NOP
    }

    @Override
    public String getConnectionString()
    {
        return connectionString;
    }
}

@@ -891,16 +891,55 @@
 itions;%0A
+import com.google.common.base.Strings;%0A
 import o
@@ -1380,58 +1380,58 @@
     
-this.connectionString = Preconditions.checkNotNull
+Preconditions.checkArgument(!Strings.isNullOrEmpty
 (con
@@ -1443,17 +1443,30 @@
 onString
-,
+),%0A           
  %22connec
@@ -1490,18 +1490,77 @@
  be null
-%22)
+ or empty%22);%0A        this.connectionString = connectionString
 ;%0A    %7D%0A

check empty connection string in FixedEnsembleProvider