jobpriority.java

java jdk 1.4的源码

/*
 * @(#)JobPriority.java	1.4 03/01/23
 *
 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package javax.print.attribute.standard;

import javax.print.attribute.IntegerSyntax;
import javax.print.attribute.PrintRequestAttribute;
import javax.print.attribute.PrintJobAttribute;

/**
 * Class JobPriority is an integer valued printing attribute class that 
 * specifies a print job's priority. 
 * <P>
 * If a JobPriority attribute is specified for a Print Job, it specifies a 
 * priority for scheduling the job. A higher value specifies a higher priority. 
 * The value 1 indicates the lowest possible priority. The value 100 indicates 
 * the highest possible priority. Among those jobs that are ready to print, a 
 * printer must print all jobs with a priority value of <I>n</I> before printing 
 * those with a priority value of <I>n</I>-1 for all <I>n.</I> 
 * <P>
 * If the client does not specify a JobPriority attribute for a Print Job and 
 * the printer does support the JobPriority attribute, the printer must use an 
 * implementation-defined default JobPriority value. 
 * <P>
 * The client can always specify any job priority value from 1 to 100 for a job. 
 * However, a Print Service instance may support fewer than 100 different 
 * job priority levels. If this is the case, the Print Service instance 
 * automatically maps the client-specified job priority value to one of the 
 * supported job priority levels, dividing the 100 job priority values equally 
 * among the available job priority levels. 
 * <P>
 * <B>IPP Compatibility:</B> The integer value gives the IPP integer value. The 
 * category name returned by <CODE>getName()</CODE> gives the IPP attribute 
 * name. 
 * <P>
 *
 * @author  Alan Kaminsky
 */
public final class JobPriority extends IntegerSyntax
    implements PrintRequestAttribute, PrintJobAttribute {

    /**
     * Construct a new job priority attribute with the given integer value. 
     *
     * @param  value  Integer value.
     *
     * @exception  IllegalArgumentException
     *     (Unchecked exception) Thrown if <CODE>value</CODE> is less than 1
     *     or greater than 100.
     */
    public JobPriority(int value) {
	super (value, 1, 100);
    }

    /**
     * Returns whether this job priority attribute is equivalent to the passed 
     * in object. To be equivalent, all of the following conditions must be 
     * true: 
     * <OL TYPE=1>
     * <LI>
     * <CODE>object</CODE> is not null.
     * <LI>
     * <CODE>object</CODE> is an instance of class JobPriority.
     * <LI>
     * This job priority attribute's value and <CODE>object</CODE>'s value 
     * are equal. 
     * </OL>
     *
     * @param  object  Object to compare to.
     *
     * @return  True if <CODE>object</CODE> is equivalent to this job
     *          priority attribute, false otherwise. 
     */
    public boolean equals(Object object) {
	return (super.equals (object) && object instanceof JobPriority);
    }

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