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Munin reporter for Coda Hale's metrics lib

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/*
 * Copyright (c) 2012-2014 Spotify AB
 *
 * 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.spotify.statistics;

public class MuninUtil {

  private MuninUtil() {
  }

  public static String escapeMuninName(final String name) {
    // escape Munin field names according to
    // http://munin-monitoring.org/wiki/notes_on_datasource_names

    return name.replaceFirst("^[^A-Za-z_]", "_").replaceAll("[^A-Za-z0-9_]", "_").toLowerCase();
  }

  public static String validateMuninName(final String name) {
    if (!name.equals(escapeMuninName(name))) {
      throw new IllegalArgumentException(name + " is not a valid munin name");
    }
    return name;
  }
}