All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.databene.commons.version.VersionNumber Maven / Gradle / Ivy

Go to download

'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

There is a newer version: 1.0.11
Show newest version
/*
 * Copyright (C) 2004-2014 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.commons.version;

import java.io.Serializable;
import java.text.ParsePosition;
import java.util.Arrays;
import java.util.List;

import org.databene.commons.CollectionUtil;

/**
 * Represents a software version number.
 * Attention: equals() may return false for instances which are equivalent concerning compareTo(), e.g. 1.0 and 1.0.0.

 * 

 * Created at 22.12.2008 16:46:24
 * @since 0.5.7
 * @author Volker Bergmann
 */

public class VersionNumber implements Comparable, Serializable {

	private static final long serialVersionUID = 8411677292851262669L;
	
	private static final NumberVersionNumberComponent ZERO_COMPONENT = new NumberVersionNumberComponent("0");
	private static final VersionNumberParser PARSER = new VersionNumberParser();
	
	private VersionNumberComponent[] components;
	private String[] delimiters;
	
	public static VersionNumber valueOf(String text) {
		return PARSER.parseObject(text, new ParsePosition(0));
	}
	
	/*
	public VersionNumber(String number) {
		if (StringUtil.isEmpty(number)) {
			components = new VersionNumberComponent[] { new NumberVersionNumberComponent("1") };
			delimiters = new String[0];
		} else {
			ParsePosition pos = new ParsePosition(0);
			String delimiter;
			ArrayBuilder componentBuilder 
				= new ArrayBuilder(VersionNumberComponent.class);
			ArrayBuilder delimBuilder = new ArrayBuilder(String.class);
			do {
				componentBuilder.add(parseComponent(number, pos));
				delimiter = parseDelimiter(number, pos);
				if (delimiter != null)
					delimBuilder.add(delimiter);
			} while (delimiter != null);
			this.components = componentBuilder.toArray();
			this.delimiters = delimBuilder.toArray();
		}
	}
	*/
	
	public VersionNumber(List components) {
		this.components = new VersionNumberComponent[components.size() / 2 + 1];
		this.delimiters = new String[components.size() / 2];
		for (int i = 0; i < components.size(); i += 2) {
			Object component = components.get(i);
			if (component instanceof Number)
				this.components[i / 2] = new NumberVersionNumberComponent(((Number) component).intValue());
			else
				this.components[i / 2] = new StringVersionNumberComponent((String) component);
			if (i / 2 < delimiters.length)
				this.delimiters[i / 2] = (String) components.get(i + 1);
		}
	}

	public VersionNumber(List components, List delimiters) {
		this.components = CollectionUtil.toArray(components, VersionNumberComponent.class);
		this.delimiters = CollectionUtil.toArray(delimiters, String.class);
	}

	@Override
	public int compareTo(VersionNumber that) {
		int n = Math.min(this.components.length, that.components.length);
		for (int i = 0; i < n; i++) {
			int componentComparation = this.components[i].compareTo(that.components[i]);
			if (componentComparation != 0)
				return componentComparation;
		}
		if (this.components.length == that.components.length)
			return 0;
		else if (this.components.length < that.components.length)
			return - checkAdditionalComponents(that.components, this.components.length);
		else
			return checkAdditionalComponents(this.components, that.components.length);
	}
	
	private static int checkAdditionalComponents(VersionNumberComponent[] components, int from) {
		for (int i = from; i < components.length; i++) {
			int comparation = components[i].compareTo(ZERO_COMPONENT);
			if (comparation != 0)
				return comparation;
		}
		return 0;
	}

	@Override
	public String toString() {
		StringBuilder builder = new StringBuilder();
		for (int i = 0; i < components.length; i++) {
			builder.append(components[i]);
			if (i < delimiters.length)
				builder.append(delimiters[i]);
		}
		return builder.toString();
	}

	@Override
	public int hashCode() {
		return 31 * Arrays.hashCode(components) + Arrays.hashCode(delimiters);
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null || getClass() != obj.getClass())
			return false;
		VersionNumber other = (VersionNumber) obj;
		return (Arrays.equals(components, other.components) && Arrays.equals(delimiters, other.delimiters));
	}
	
}
    

    

    

            

    

            



    
    






    
© 2015 - 2024 Weber Informatics LLC | Privacy Policy