/*
 ***************************************************************************************
 *  Copyright (C) 2006 EsperTech, Inc. All rights reserved.                            *
 *  http://www.espertech.com/esper                                                     *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 ***************************************************************************************
 */
package com.espertech.esper.type;

import java.util.regex.Pattern;

/**
 * Regular expression matcher.
 */
public class StringPatternSetRegex implements StringPatternSet {
    private final String patternText;
    private final Pattern pattern;
    private static final long serialVersionUID = -506839196395937712L;

    /**
     * Ctor.
     *
     * @param patternText regex to match
     */
    public StringPatternSetRegex(String patternText) {
        this.patternText = patternText;
        this.pattern = Pattern.compile(patternText);
    }

    /**
     * Match the string returning true for a match, using regular expression semantics.
     *
     * @param stringToMatch string to match
     * @return true for match
     */
    public boolean match(String stringToMatch) {
        return pattern.matcher(stringToMatch).matches();
    }

    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        StringPatternSetRegex that = (StringPatternSetRegex) o;

        if (!patternText.equals(that.patternText)) return false;

        return true;
    }

    public int hashCode() {
        return patternText.hashCode();
    }
}