code: package it.unibz.inf.ontop.si.repository.impl;
  
  /*
   * #%L
   * ontop-reformulation-core
   * %%
   * Copyright (C) 2009 - 2014 Free University of Bozen-Bolzano
   * %%
   * 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.
   * #L%
   */
  
  
  /**
   * Contiguous interval
   *
   * @author Sergejs Pugacs
   */
  public class Interval {
  
  	private final int start, end;
  
      public Interval(int start, int end) {
          if (start > end)
              throw new IllegalArgumentException("Invalid interval [" + start + ", " + end + "]");
  
          this.start = start;
          this.end = end;
      }
  
      public int getStart() {
          return start;
      }
  
      public int getEnd() {
          return end;
      }
  
      @Override
      public String toString() {
          return String.format("[%s:%s]", start, end);
      }
  
      @Override
      public boolean equals(Object obj) {
          if (obj instanceof Interval) {
              Interval other = (Interval) obj;
          	return this.start == other.start && this.end == other.end;
          }
          return false;
      }
  }