/*
 * @(#)JobStateReasons.java	1.8 04/05/05
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package javax.print.attribute.standard;

import java.util.Collection;
import java.util.HashSet;

import javax.print.attribute.Attribute;
import javax.print.attribute.PrintJobAttribute;

/**
 * Class JobStateReasons is a printing attribute class, a set of enumeration 
 * values, that provides additional information about the job's current state, 
 * i.e., information that augments the value of the job's {@link JobState 
 * JobState} attribute.
 * <P>
 * Instances of {@link JobStateReason JobStateReason} do not appear in a Print 
 * Job's attribute set directly. Rather, a JobStateReasons attribute appears in 
 * the Print Job's attribute set. The JobStateReasons attribute contains zero, 
 * one, or more than one {@link JobStateReason JobStateReason} objects which 
 * pertain to the Print Job's status. The printer adds a {@link JobStateReason 
 * JobStateReason} object to the Print Job's JobStateReasons attribute when the 
 * corresponding condition becomes true of the Print Job, and the printer 
 * removes the {@link JobStateReason JobStateReason} object again when the 
 * corresponding condition becomes false, regardless of whether the Print Job's 
 * overall {@link JobState JobState} also changed. 
 * <P>
 * Class JobStateReasons inherits its implementation from class {@link 
 * java.util.HashSet java.util.HashSet}. Unlike most printing attributes which 
 * are immutable once constructed, class JobStateReasons is designed to be 
 * mutable; you can add {@link JobStateReason JobStateReason} objects to an 
 * existing JobStateReasons object and remove them again. However, like class 
 * {@link java.util.HashSet java.util.HashSet}, class JobStateReasons is not 
 * multiple thread safe. If a JobStateReasons object will be used by multiple 
 * threads, be sure to synchronize its operations (e.g., using a synchronized 
 * set view obtained from class {@link java.util.Collections 
 * java.util.Collections}). 
 * <P>
 * <B>IPP Compatibility:</B> The string value returned by each individual {@link 
 * JobStateReason JobStateReason} object's <CODE>toString()</CODE> method gives 
 * the IPP keyword value. The category name returned by <CODE>getName()</CODE> 
 * gives the IPP attribute name. 
 * <P>
 *
 * @author  Alan Kaminsky
 */
public final class JobStateReasons 
    extends HashSet<JobStateReason> implements PrintJobAttribute {

    private static final long serialVersionUID = 8849088261264331812L;

    /**
     * Construct a new, empty job state reasons attribute; the underlying hash 
     * set has the default initial capacity and load factor. 
     */
    public JobStateReasons() {
	super();
    }

    /**
     * Construct a new, empty job state reasons attribute; the underlying hash 
     * set has the given initial capacity and the default load factor. 
     *
     * @param  initialCapacity  Initial capacity.
     * @throws IllegalArgumentException if the initial capacity is less 
     *     than zero.
     */
    public JobStateReasons(int initialCapacity) {
	super (initialCapacity);
    }

    /**
     * Construct a new, empty job state reasons attribute; the underlying hash 
     * set has the given initial capacity and load factor. 
     *
     * @param  initialCapacity  Initial capacity.
     * @param  loadFactor       Load factor.
     * @throws IllegalArgumentException if the initial capacity is less 
     *     than zero.
     */
    public JobStateReasons(int initialCapacity, float loadFactor) {
	super (initialCapacity, loadFactor);
    }

    /**
     * Construct a new job state reasons attribute that contains the same
     * {@link JobStateReason JobStateReason} objects as the given collection.
     * The underlying hash set's initial capacity and load factor are as
     * specified in the superclass constructor {@link 
     * java.util.HashSet#HashSet(java.util.Collection) 
     * <CODE>HashSet(Collection)</CODE>}. 
     *
     * @param  collection  Collection to copy.
     *
     * @exception  NullPointerException
     *     (unchecked exception) Thrown if <CODE>collection</CODE> is null or 
     *     if any element in <CODE>collection</CODE> is null. 
     * @throws  ClassCastException
     *     (unchecked exception) Thrown if any element in 
     *     <CODE>collection</CODE> is not an instance of class {@link 
     *     JobStateReason JobStateReason}. 
     */
   public JobStateReasons(Collection<JobStateReason> collection) {
       super (collection);
   }
	
    /**
     * Adds the specified element to this job state reasons attribute if it is 
     * not already present. The element to be added must be an instance of class 
     * {@link JobStateReason JobStateReason}. If this job state reasons 
     * attribute already contains the specified element, the call leaves this 
     * job state reasons attribute unchanged and returns <tt>false</tt>. 
     *
     * @param  o  Element to be added to this job state reasons attribute.
     *
     * @return  <tt>true</tt> if this job state reasons attribute did not
     *          already contain the specified element. 
     * 
     * @throws  NullPointerException
     *     (unchecked exception) Thrown if the specified element is null.
     * @throws  ClassCastException
     *     (unchecked exception) Thrown if the specified element is not an 
     *     instance of class {@link JobStateReason JobStateReason}. 
     */
    public boolean add(JobStateReason o) {
	if (o == null) {
	    throw new NullPointerException();
	}
	return super.add ((JobStateReason) o);
    }

    /**
     * Get the printing attribute class which is to be used as the "category" 
     * for this printing attribute value.
     * <P>
     * For class JobStateReasons, the category is class JobStateReasons itself. 
     *
     * @return  Printing attribute class (category), an instance of class
     *          {@link java.lang.Class java.lang.Class}.
     */
    public final Class<? extends Attribute> getCategory() {
	return JobStateReasons.class;
    }

    /**
     * Get the name of the category of which this attribute value is an 
     * instance. 
     * <P>
     * For class JobStateReasons, the category 
     * name is <CODE>"job-state-reasons"</CODE>. 
     *
     * @return  Attribute category name.
     */
    public final String getName() {
	return "job-state-reasons";
    }
    
}