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package nak.data

/*
 Copyright 2009 David Hall, Daniel Ramage
 
 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. 
*/


/**
 * Something that has a label. 
 * 
 * @author dlwh
 */
trait Labeled[+L] {
  def label : L
}

/**
 * A trait for classes that indexes labels and get labels of indexes.
 */
trait LabelMap[L] extends Serializable {
  def indexOfLabel(label: L): Int
  def labelOfIndex(index: Int): L
  def labels: Seq[L]
}