/**
 * 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.data.transfer.state;

import java.text.NumberFormat;
import java.util.Random;

public class DefaultStateProvider implements StateProvider {

    /**
     * Default implementation. Here, ids are generated randomly.
     */
    @Override
    public int getId() {

        NumberFormat numberFormat = NumberFormat.getInstance();
        numberFormat.setMinimumIntegerDigits(5);
        numberFormat.setGroupingUsed(false);
        return Integer
            .parseInt(numberFormat.format(Math.abs(new Random().nextInt())));
    }

    private static StateProvider sp;

    public static synchronized StateProvider get() {
        if (null == sp) {
            sp = new DefaultStateProvider();
        }
        return sp;
    }
}