datasourcetype.java

jrobin,使用纯java实现的RRD数据库,使用RRD数据库来统计数据.

/*
 * Copyright (C) 2001 Ciaran Treanor <[e-mail]>
 *
 * Distributable under GPL license.
 * See terms of license at gnu.org.
 *
 * $Id: DataSourceType.java,v 1.2 2006/05/23 12:04:47 sasam Exp $
 */
package org.jrobin.core.jrrd;

/**
 * Class DataSourceType
 *
 * @author <a href="mailto:[e-mail]">Ciaran Treanor</a>
 * @version $Revision: 1.2 $
 */
public class DataSourceType {

	private static final int _COUNTER = 0;
	private static final String STR_COUNTER = "COUNTER";

	/**
	 * Field COUNTER
	 */
	public static final DataSourceType COUNTER =
			new DataSourceType(_COUNTER);
	private static final int _ABSOLUTE = 1;
	private static final String STR_ABSOLUTE = "ABSOLUTE";

	/**
	 * Field ABSOLUTE
	 */
	public static final DataSourceType ABSOLUTE =
			new DataSourceType(_ABSOLUTE);
	private static final int _GAUGE = 2;
	private static final String STR_GAUGE = "GAUGE";

	/**
	 * Field GAUGE
	 */
	public static final DataSourceType GAUGE = new DataSourceType(_GAUGE);
	private static final int _DERIVE = 3;
	private static final String STR_DERIVE = "DERIVE";

	/**
	 * Field DERIVE
	 */
	public static final DataSourceType DERIVE = new DataSourceType(_DERIVE);
	private int type;

	private DataSourceType(int type) {
		this.type = type;
	}

	/**
	 * Returns a <code>DataSourceType</code> with the given name.
	 *
	 * @param s name of the <code>DataSourceType</code> required.
	 * @return a <code>DataSourceType</code> with the given name.
	 */
	public static DataSourceType get(String s) {

		if (s.equalsIgnoreCase(STR_COUNTER)) {
			return COUNTER;
		}
		else if (s.equalsIgnoreCase(STR_ABSOLUTE)) {
			return ABSOLUTE;
		}
		else if (s.equalsIgnoreCase(STR_GAUGE)) {
			return GAUGE;
		}
		else if (s.equalsIgnoreCase(STR_DERIVE)) {
			return DERIVE;
		}
		else {
			throw new IllegalArgumentException("Invalid DataSourceType");
		}
	}

	/**
	 * Compares this object against the specified object.
	 *
	 * @return <code>true</code> if the objects are the same,
	 *         <code>false</code> otherwise.
	 */
	public boolean equals(Object obj) {

		if (!(obj instanceof DataSourceType)) {
			throw new IllegalArgumentException("Not a DataSourceType");
		}

		return (((DataSourceType) obj).type == type)
				? true
				: false;
	}

	/**
	 * Returns a string representation of this object.
	 *
	 * @return a string representation of this object.
	 */
	public String toString() {

		String strType;

		switch (type) {

			case _COUNTER:
				strType = STR_COUNTER;
				break;

			case _ABSOLUTE:
				strType = STR_ABSOLUTE;
				break;

			case _GAUGE:
				strType = STR_GAUGE;
				break;

			case _DERIVE:
				strType = STR_DERIVE;
				break;

			default :
				// Don't you just hate it when you see a line like this?
				throw new RuntimeException("This should never happen");
		}

		return strType;
	}
}