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'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.

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/*
 * Copyright (C) 2004-2015 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.commons.version;

import java.util.HashMap;
import java.util.Map;

import org.databene.commons.comparator.IntComparator;

/**
 * {@link VersionNumberComponent} implementation for String-type number components.
 * Created at 07.01.2009 19:07:55
 * @since 0.5.7
 * @author Volker Bergmann
 */

public class StringVersionNumberComponent extends VersionNumberComponent {
	
	private static final long serialVersionUID = -3865105131640319765L;

	static final String[] KEY_ORDER = {
		"snapshot", 
		"alpha",
		"beta",
		"rc", "cr",
		"final", "ga",
		"sp"
	};
	
	public static final StringVersionNumberComponent SNAPSHOT = new StringVersionNumberComponent("snapshot");
	
	static final Map ordinals;
	
	static {
		ordinals = new HashMap();
		for (int i = 0; i < KEY_ORDER.length; i++)
			ordinals.put(KEY_ORDER[i], i);
	}
	
	static final int FINAL_INDEX = ordinals.get("final");
	static final int SP_INDEX = ordinals.get("sp");
	
	private String key;
	
	public StringVersionNumberComponent(String key) {
		super();
		this.key = key;
	}

	@Override
	public int compareTo(VersionNumberComponent that) {
		if (that == null)
			return -1;
		Integer thisIndexObject = ordinals.get(this.key.toLowerCase());
		int thisIndex = (thisIndexObject != null ? thisIndexObject.intValue() : FINAL_INDEX);
		if (that instanceof NumberVersionNumberComponent) {
			boolean number = ((NumberVersionNumberComponent) that).getNumber() == 0;
			if (number && thisIndex >= SP_INDEX)
				return 1;
			else if (number && thisIndex >= FINAL_INDEX)
				return 0;
			else
				return -1;
		}
		Integer thatIndexObject = ordinals.get((((StringVersionNumberComponent) that).key).toLowerCase());
		int thatIndex = (thatIndexObject != null ? thatIndexObject.intValue() : FINAL_INDEX);
		return IntComparator.compare(thisIndex, thatIndex);
	}
	
	@Override
	public String toString() {
		return key;
	}

	@Override
	public int hashCode() {
		return key.toLowerCase().hashCode();
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		StringVersionNumberComponent that = (StringVersionNumberComponent) obj;
		return this.compareTo(that) == 0;
	}
	
}