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A Kafka Connect Couchbase connector for copying data between Kafka and Couchbase Server.

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/*
 * Copyright 2020 Couchbase, 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 com.couchbase.connect.kafka.util.config;

import java.util.Collections;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class DataSizeParser {
  private DataSizeParser() {
    throw new AssertionError("not instantiable");
  }

  private static final Pattern PATTERN = Pattern.compile("(\\d+)(.+)");

  private static final Map qualifierToScale;

  static {
    final Map temp = new HashMap<>();
    temp.put("b", 1);
    temp.put("k", 1024);
    temp.put("m", 1024 * 1024);
    temp.put("g", 1024 * 1024 * 1024);
    qualifierToScale = Collections.unmodifiableMap(temp);
  }

  public static DataSize parseDataSize(String s) {
    s = s.trim().toLowerCase(Locale.ROOT);

    if (s.equals("0")) {
      return DataSize.ofBytes(0);
    }

    final Matcher m = PATTERN.matcher(s);
    if (!m.matches() || !qualifierToScale.containsKey(m.group(2))) {
      throw new IllegalArgumentException("Unable to parse size '" + s + "'." +
          " Please specify an integer followed by a size unit (b = bytes, k = kilobytes, m = megabytes, g = gigabytes)." +
          " For example, to specify 64 megabytes: 64m");
    }

    final long value = Long.parseLong(m.group(1));
    final Integer unit = qualifierToScale.get(m.group(2));
    return DataSize.ofBytes(value * unit);
  }
}