org.databene.formats.regex.CustomCharClass Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of databene-formats Show documentation

'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.

There is a newer version: 1.0.14

Show newest version

/*
 * 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;

import java.util.ArrayList;
import java.util.List;

import org.databene.commons.CharSet;

/**
 * Represents a custom character class with inclusions and exclusions.

 * 

 * Created at 20.09.2009 11:18:28
 * @since 0.5.0
 * @author Volker Bergmann
 */

public class CustomCharClass extends RegexCharClass {
	
	private List inclusions;
	private List exclusions;
	
	// constructors ----------------------------------------------------------------------------------------------------
	
	public CustomCharClass() {
		this(null);
	}
	
    public CustomCharClass(List includedSets) {
	    this(includedSets, null);
    }
    
    public CustomCharClass(List includedSets, List excludedSets) {
	    this.inclusions = new ArrayList();
	    if (includedSets != null)
	    	this.inclusions.addAll(includedSets);
	    this.exclusions = new ArrayList();
	    if (excludedSets != null)
	    	this.exclusions.addAll(excludedSets);
    }
    
    
    // interface -------------------------------------------------------------------------------------------------------
    
	@Override
	public CharSet getCharSet() {
		CharSet set = new CharSet();
		for (RegexCharClass inclusion : inclusions)
			set.addAll(inclusion.getCharSet().getSet());
		for (RegexCharClass exclusion : exclusions)
			set.removeAll(exclusion.getCharSet().getSet());
		return set;
	}
	
	public void addInclusion(RegexCharClass set) {
		this.inclusions.add(set);
	}
	
	public void addExclusions(RegexCharClass set) {
		this.exclusions.add(set);
	}
	
	public boolean hasInclusions() {
		return !inclusions.isEmpty();
	}
	
	
	// private helpers -------------------------------------------------------------------------------------------------
	
    private static void appendToString(List objects, StringBuilder builder) {
	    for (Object object : objects)
	    	builder.append(object);
    }
    
    
	// java.lang.Object overrides --------------------------------------------------------------------------------------
	
	@Override
	public String toString() {
		StringBuilder result = new StringBuilder("[");
		appendToString(inclusions, result);
		if (!exclusions.isEmpty()) {
			result.append('^');
			appendToString(exclusions, result);
		}
		return result.append(']').toString();
	}
	
	@Override
	public int hashCode() {
		return 31 * exclusions.hashCode() + inclusions.hashCode();
	}
	
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null || getClass() != obj.getClass())
			return false;
		CustomCharClass that = (CustomCharClass) obj;
		return (this.inclusions.equals(that.inclusions) && 
				this.exclusions.equals(that.exclusions));
	}

}