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package com.sun.enterprise.admin.monitor.registry;

/**
 * Provides enumerated constants related to various levels
 * at which monitoring could be set
 * @author  Shreedhar Ganapathy
 * @author  Kedar Mhaswade
 */
public class MonitoringLevel {

    public static final MonitoringLevel OFF  = new MonitoringLevel("OFF");
    public static final MonitoringLevel LOW  = new MonitoringLevel("LOW");
    public static final MonitoringLevel HIGH = new MonitoringLevel("HIGH");

    private final String name;
    
    /**
     * Constructor
     */
    private MonitoringLevel(String name ) {
        this.name = name;
    }
    
    public String toString() {
        return ( name );
    }
	
    /**
     * Returns an instance of MonitoringLevel for the given String.
     * The given String has to correspond to one of the public fields declared
     * in this class.
     *
     * @param name String representing the MonitoringLevel
     * @return MonitoringLevel corresponding to given parameter, or null
     * if the parameter is null or does not correspond to any of the
     * Monitoring Levels supported.
     * For $Revision: 1.2 $ of this class, "off", "high" and "low" are
     * supported strings. The comparison is done case insensitively.
     */
    public static MonitoringLevel instance(String name) {
        if (OFF.toString().equalsIgnoreCase(name))
            return ( OFF );
        else if (LOW.toString().equalsIgnoreCase(name))
            return ( LOW );
        else if (HIGH.toString().equalsIgnoreCase(name))
            return ( HIGH );
        return ( null );
    }

    /**
     * Checks two MonitoringLevel objects for equality.
     * 
     * Checks that obj is a MonitoringLevel, and has the same name as
     * this object.
     * 
     * @param obj the object we are testing for equality with this object.
     * @return true if obj is a MonitoringLevel, and has the same name as this
     * MonitoringLevel object.
     */
    public boolean equals(Object obj) {
	if (obj == this)
	    return true;

	if (! (obj instanceof MonitoringLevel))
	    return false;

	MonitoringLevel that = (MonitoringLevel) obj;

	return (this.name.equals(that.name));
    }

    /**
     * Returns the hash code value for this object.
     *
     * The hash code returned is the hash code of the name of this
     * MonitoringLevel object.
     *
     * @return Hash code value for this object.
     */
    public int hashCode() {
	return this.name.hashCode();
    }

}