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'Databene Formats' is an open source software library for supporting
data file and other formats like CSV, fixed width files, XLS, Properties and Regex.
It is designed for multithreaded use and high performance.
/*
* Copyright (C) 2011-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* 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 org.databene.formats.regex;
/**
* Represents a quantifier of a regular expression, e.g. '{1,3}'.
*
*/
public class Quantifier {
/** minimum length */
private int min;
/** maximum length */
private Integer max;
/** Complete constructor that takes values for all attributes */
public Quantifier(int min, Integer max) {
this.min = min;
this.max = max;
}
/** returns the minimum value */
public int getMin() {
return min;
}
/** returns the maximum value */
public Integer getMax() {
return max;
}
// java.lang.Object overrides --------------------------------------------------------------------------------------
/**
* Creates a String of regular expression format, e.g. '{2,}', '{1,3}', '+', '?'
* @see java.lang.Object#equals(Object)
*/
@Override
public String toString() {
if (max != null && min == max)
return (min == 1 ? "" : '{' + String.valueOf(min) + '}');
else if (min == 0) {
if (max == null)
return "*";
else if (max == 1)
return "?";
else
return "{0," + max + '}';
} else if (min == 1)
return (max == null ? "+" : "{1," + max + "}");
else
return (max == null ? "{" + min + ",}" : "{1," + "}");
}
/**
* @see java.lang.Object#equals(Object)
*/
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass())
return false;
final Quantifier that = (Quantifier) o;
if (max != that.max)
return false;
return min == that.min;
}
/**
* @see java.lang.Object#equals(Object)
*/
@Override
public int hashCode() {
return 29 * min + (max != null ? max : 0);
}
}