/**
    * Copyright 2004-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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 org.kuali.common.aws.cloudfront;
  
  import java.util.Comparator;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.common.aws.s3.old.BucketConstants;
  
  /**
   * Sort version numbers in the correct order.
   * 
   * <pre>
   * 1.1.10          <  1.1.2
   * 1.1.10-SNAPSHOT <  1.1.10
   * </pre>
   */
  public class DisplayRowComparator implements Comparator<DisplayRow> {
  
  	public static final String DEFAULT_SEPARATORS = ".-";
  
  	String separators = DEFAULT_SEPARATORS;
  	String delimiter = BucketConstants.DEFAULT_DELIMITER;
  
  	@Override
  	public int compare(DisplayRow one, DisplayRow two) {
  
  		String show1 = one.getShow();
  		String show2 = two.getShow();
  
  		if (show1 == null && show2 == null) {
  			return 0;
  		}
  
  		if (show1 == null) {
  			return -1;
  		}
  
  		if (show2 == null) {
  			return 1;
  		}
  
  		show1 = StringUtils.strip(show1, delimiter);
  		show2 = StringUtils.strip(show2, delimiter);
  
  		String[] tokens1 = StringUtils.split(show1, separators);
  		String[] tokens2 = StringUtils.split(show2, separators);
  
  		int len = Math.min(tokens1.length, tokens2.length);
  
  		for (int i = 0; i < len; i++) {
  			String token1 = tokens1[i];
  			String token2 = tokens2[i];
  			int compareTo = compareTokens(token1, token2);
  			if (compareTo != 0) {
  				return compareTo;
  			}
  		}
  
  		return tokens1.length - tokens2.length;
  	}
  
  	protected int compareTokens(String token1, String token2) {
  		try {
  			int i1 = Integer.parseInt(token1);
  			int i2 = Integer.parseInt(token2);
  			return Double.compare(i1, i2);
  		} catch (NumberFormatException e) {
  			; // Intentionally ignore this
  		}
  
  		// Fall through to sorting things as regular strings
  		return token1.compareTo(token2);
  
  	}
  
  	public String getSeparators() {
  		return separators;
  	}
  
  	public void setSeparators(String separators) {
  		this.separators = separators;
  	}
  
  	public String getDelimiter() {
  		return delimiter;
 	}
 
 	public void setDelimiter(String delimiter) {
 		this.delimiter = delimiter;
 	}
 
 }