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1   /*
2    * Copyright 2006-2007 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.batch.item.file.transform;
18  
19  import org.springframework.util.Assert;
20  
21  /**
22   * A class to represent ranges. A Range can have minimum/maximum values from
23   * interval <1,Integer.MAX_VALUE-1> A Range can be unbounded at maximum
24   * side. This can be specified by passing {@link Range#UPPER_BORDER_NOT_DEFINED}} as max
25   * value or using constructor {@link #Range(int)}.
26   * 
27   * @author peter.zozom
28   */
29  public class Range {
30  
31  	public final static int UPPER_BORDER_NOT_DEFINED = Integer.MAX_VALUE;
32  	
33  	final private int min;	
34  	final private int max;
35  	
36  	public Range(int min) {
37  		this(min,UPPER_BORDER_NOT_DEFINED);		
38  	}
39  	
40  	public Range(int min, int max) {
41  		checkMinMaxValues(min, max);
42  		this.min = min;
43  		this.max = max;
44  	}
45  
46  	public int getMax() {		
47  		return max;
48  	}
49  
50  	public int getMin() {
51  		return min;
52  	}
53  
54  	public boolean hasMaxValue() {
55  		return max != UPPER_BORDER_NOT_DEFINED;
56  	}
57  	
58      @Override
59  	public String toString() {
60  		return hasMaxValue() ? min + "-" + max : String.valueOf(min);
61  	}
62  	
63  	private void checkMinMaxValues(int min, int max) {
64  		Assert.isTrue(min>0, "Min value must be higher than zero");
65  		Assert.isTrue(min<=max, "Min value should be lower or equal to max value");		
66  	}
67  }