/*
 * @(#)EnumControl.java	1.15 05/11/17
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.sound.sampled;

/**
 * A <code>EnumControl</code> provides control over a set of
 * discrete possible values, each represented by an object.  In a
 * graphical user interface, such a control might be represented
 * by a set of buttons, each of which chooses one value or setting.  For
 * example, a reverb control might provide several preset reverberation
 * settings, instead of providing continuously adjustable parameters
 * of the sort that would be represented by <code>{@link FloatControl}</code>
 * objects.
 * <p>
 * Controls that provide a choice between only two settings can often be implemented
 * instead as a <code>{@link BooleanControl}</code>, and controls that provide
 * a set of values along some quantifiable dimension might be implemented
 * instead as a <code>FloatControl</code> with a coarse resolution.
 * However, a key feature of <code>EnumControl</code> is that the returned values
 * are arbitrary objects, rather than numerical or boolean values.  This means that each
 * returned object can provide further information.  As an example, the settings
 * of a <code>{@link EnumControl.Type#REVERB REVERB}</code> control are instances of
 * <code>{@link ReverbType}</code> that can be queried for the parameter values
 * used for each setting.
 *
 * @author Kara Kytle
 * @version 1.15, 05/11/17
 * @since 1.3
 */
public abstract class EnumControl extends Control {
    
    
    // TYPE DEFINES
    
    
    // INSTANCE VARIABLES
    
    
    /**
     * The set of possible values.
     */
    private Object[] values;
    
    
    /**
     * The current value.
     */
    private Object value;
    
    
    
    // CONSTRUCTORS
    
    
    /**
     * Constructs a new enumerated control object with the given parameters.
     *
     * @param type the type of control represented this enumerated control object
     * @param values the set of possible values for the control
     * @param value the initial control value
     */
    protected EnumControl(Type type, Object[] values, Object value) {
	
	super(type);
	
	this.values = values;
	this.value = value;
    }
    
    
    
    // METHODS
    
    
    /**
     * Sets the current value for the control.  The default implementation
     * simply sets the value as indicated.  If the value indicated is not
     * supported, an IllegalArgumentException is thrown.
     * Some controls require that their line be open before they can be affected
     * by setting a value.
     * @param value the desired new value
     * @throws IllegalArgumentException if the value indicated does not fall
     * within the allowable range
     */
    public void setValue(Object value) {
	if (!isValueSupported(value)) {
	    throw new IllegalArgumentException("Requested value " + value + " is not supported.");
	}
	
	this.value = value;
    }
    
    
    /**
     * Obtains this control's current value.