org.databene.regex.Quantifier Maven / Gradle / Ivy
Go to download
'databene webdecs' is an open source software library for
WEB Data Extraction, Conversion and Scripting, written by Volker Bergmann.
The newest version!
/*
* (c) Copyright 2007 by Volker Bergmann. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, is permitted under the terms of the
* GNU General Public License.
*
* For redistributing this software or a derivative work under a license other
* than the GPL-compatible Free Software License as defined by the Free
* Software Foundation or approved by OSI, you must first obtain a commercial
* license to this software product from Volker Bergmann.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
* REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
* HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package org.databene.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);
}
}