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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.

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/*
 * Copyright (C) 2011-2015 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;

import org.databene.commons.CharSet;

/**
 * Represents a constant character as part of a regular expression.
 * Created: 04.04.2014 18:22:39
 * @since 0.8.0
 * @author Volker Bergmann
 */

public class RegexChar extends RegexCharClass {
	
	private char c;
	private CharSet charSet;

	public RegexChar(char c) {
		this.c = c;
		this.charSet = new CharSet().add(c);
	}

	public char getChar() {
		return c;
	}

	@Override
	public CharSet getCharSet() {
		return charSet;
	}
	
	@Override
	public int hashCode() {
		return c;
	}

	@Override
	public int minLength() {
		return 1;
	}

	@Override
	public Integer maxLength() {
		return 1;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null || getClass() != obj.getClass())
			return false;
		RegexChar that = (RegexChar) obj;
		return (this.c == that.c);
	}
	
	@Override
	public String toString() {
		return String.valueOf(c);
	}

}