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Utility classes to handle user-agents.
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/*
* Copyright (c) 2008-2018, Harald Walker (bitwalker.eu) and contributing developers 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the
* following conditions are met:
* 
* * Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
* 
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
* 
* * Neither the name of bitwalker nor the names of its
* contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
* 
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package eu.bitwalker.useragentutils;

/**
 * Container for general version information.
 * All version information is stored as String as sometimes version information includes alphabetical characters.
 * @author harald
 */
public class Version implements Comparable {
	
	String version;
	String majorVersion;
	String minorVersion;
	
	/**
	 * This constructor is created for APIs that require default constructor 
	 * and should never be used directly.
	 * @deprecated Use {@link #Version(String, String, String)} 
	 */
	@Deprecated
	public Version() {
		// default constructor for APIs that require it (e.g. JSON serialization)
	}

	public Version(String version, String majorVersion, String minorVersion) {
		super();
		this.version = version;
		this.majorVersion = majorVersion;
		this.minorVersion = minorVersion;
	}

	public String getVersion() {
		return version;
	}

	public String getMajorVersion() {
		return majorVersion;
	}

	public String getMinorVersion() {
		return minorVersion;
	}

	@Override
	public String toString() {
		return version;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result
				+ ((majorVersion == null) ? 0 : majorVersion.hashCode());
		result = prime * result
				+ ((minorVersion == null) ? 0 : minorVersion.hashCode());
		result = prime * result + ((version == null) ? 0 : version.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Version other = (Version) obj;
		if (majorVersion == null) {
			if (other.majorVersion != null)
				return false;
		} else if (!majorVersion.equals(other.majorVersion))
			return false;
		if (minorVersion == null) {
			if (other.minorVersion != null)
				return false;
		} else if (!minorVersion.equals(other.minorVersion))
			return false;
		if (version == null) {
			if (other.version != null)
				return false;
		} else if (!version.equals(other.version))
			return false;
		return true;
	}

        public int compareTo(Version other) {
                if (other == null) {
	            return 1;
	        }

	        String[] versionParts = version.split("\\.");
	        String[] otherVersionParts = other.version.split("\\.");

	        for (int i = 0; i < Math.min(versionParts.length, otherVersionParts.length); i++) {
	            if (versionParts[i].length() == otherVersionParts[i].length()) {
	        	int comparisonResult = versionParts[i].compareTo(otherVersionParts[i]);
	        	if (comparisonResult == 0) {
	        	    continue;
	        	} else {
	        	    return comparisonResult;
	        	}
	            } else {
	        	return versionParts[i].length() > otherVersionParts[i].length() ? 1 : -1;
	            }
	        }

	        if (versionParts.length > otherVersionParts.length) {
	            return 1;
	        } else if (versionParts.length < otherVersionParts.length) {
	            return -1;
	        } else {
	            return 0;
	        }
        }	
}