io.druid.common.utils.UUIDUtils.java Source code

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Here is the source code for io.druid.common.utils.UUIDUtils.java

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/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * Licensed 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 io.druid.common.utils;

import com.google.common.base.Joiner;
import com.google.common.base.Strings;

import java.util.ArrayList;
import java.util.UUID;

/**
 *
 */
public class UUIDUtils {
    public static final String UUID_DELIM = "_";

    /**
     * Generates a universally unique identifier.
     *
     * @param extraData Extra data which often takes the form of debugging information
     *
     * @return A string which is a universally unique id (as determined by java.util.UUID) with extra data. It does not conform to a UUID variant standard.
     */
    public static String generateUuid(String... extraData) {
        String extra = null;
        if (extraData != null && extraData.length > 0) {
            final ArrayList<String> extraStrings = new ArrayList<>(extraData.length);
            for (String extraString : extraData) {
                if (!Strings.isNullOrEmpty(extraString)) {
                    extraStrings.add(extraString);
                }
            }
            if (!extraStrings.isEmpty()) {
                extra = Joiner.on(UUID_DELIM).join(extraStrings);
            }
        }
        final String uuid = UUID.randomUUID().toString().replace("-", ""); // We don't use "-" in general, so remove them here.
        return extra == null ? uuid : (extra + UUID_DELIM + uuid);
    }
}