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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;

/**
 * Represents a group in a regular expression, e.g. '(abc)'.
 * 
 */
public class Group implements RegexPart {
	
    /** The regular sub expression */
    private RegexPart regex;
    
    /** Constructor that takes a sub expression 
     * @param regex the regular expression for the group */
    public Group(RegexPart regex) {
        this.regex = regex;
    }
    
    /** Returns the sub expression. 
     * @return the sub expression */
    public RegexPart getRegex() {
        return regex;
    }
    
    
    // RegexPart interface implementation ------------------------------------------------------------------------------
    
	@Override
	public int minLength() {
		return regex.minLength();
	}

	@Override
	public Integer maxLength() {
		return regex.maxLength();
	}
	
	
    // java.lang.Object overrides --------------------------------------------------------------------------------------
    
    /** @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;
        return regex.equals(((Group)o).regex);
    }
    
    /** @see java.lang.Object#equals(Object) */
    @Override
    public int hashCode() {
        return regex.hashCode();
    }
    
    /** @see java.lang.Object#equals(Object) */
    @Override
    public String toString() {
        return "(" + regex + ")";
    }

}