JobHoldUntil (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Ed. 5.0

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javax.print.attribute.standard
Class JobHoldUntil

java.lang.Object
  javax.print.attribute.DateTimeSyntax
      javax.print.attribute.standard.JobHoldUntil

All Implemented Interfaces:: Serializable, Cloneable, Attribute, PrintJobAttribute, PrintRequestAttribute

public final class JobHoldUntil
extends DateTimeSyntax
implements PrintRequestAttribute, PrintJobAttribute
extends DateTimeSyntax
implements PrintRequestAttribute, PrintJobAttribute

Class JobHoldUntil is a printing attribute class, a date-time attribute, that specifies the exact date and time at which the job must become a candidate for printing.

If the value of this attribute specifies a date-time that is in the future, the printer should add the JobStateReason value of JOB_HOLD_UNTIL_SPECIFIED to the job's JobStateReasons attribute, must move the job to the PENDING_HELD state, and must not schedule the job for printing until the specified date-time arrives.

When the specified date-time arrives, the printer must remove the JobStateReason value of JOB_HOLD_UNTIL_SPECIFIED from the job's JobStateReasons attribute, if present. If there are no other job state reasons that keep the job in the PENDING_HELD state, the printer must consider the job as a candidate for processing by moving the job to the PENDING state.

If the specified date-time has already passed, the job must be a candidate for processing immediately. Thus, one way to make the job immediately become a candidate for processing is to specify a JobHoldUntil attribute constructed like this (denoting a date-time of January 1, 1970, 00:00:00 GMT):

     JobHoldUntil immediately = new JobHoldUntil (new Date (0L));

If the client does not supply this attribute in a Print Request and the printer supports this attribute, the printer must use its (implementation-dependent) default JobHoldUntil value at job submission time (unlike most job template attributes that are used if necessary at job processing time).

To construct a JobHoldUntil attribute from separate values of the year, month, day, hour, minute, and so on, use a Calendar object to construct a Date object, then use the Date object to construct the JobHoldUntil attribute. To convert a JobHoldUntil attribute to separate values of the year, month, day, hour, minute, and so on, create a Calendar object and set it to the Date from the JobHoldUntil attribute.

IPP Compatibility: Although IPP supports a "job-hold-until" attribute specified as a keyword, IPP does not at this time support a "job-hold-until" attribute specified as a date and time. However, the date and time can be converted to one of the standard IPP keywords with some loss of precision; for example, a JobHoldUntil value with today's date and 9:00pm local time might be converted to the standard IPP keyword "night". The category name returned by getName() gives the IPP attribute name.

See Also:: Serialized Form

Constructor Summary

JobHoldUntil(Date dateTime)
          Construct a new job hold until date-time attribute with the given Date value.

Method Summary

boolean equals(Object object)
          Returns whether this job hold until attribute is equivalent to the passed in object.

Class<? extends Attribute> getCategory()
          Get the printing attribute class which is to be used as the "category" for this printing attribute value.

String getName()
          Get the name of the category of which this attribute value is an instance.

Methods inherited from class javax.print.attribute.DateTimeSyntax

getValue, hashCode, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Summary
`JobHoldUntil(Date dateTime)` Construct a new job hold until date-time attribute with the given `Date` value.

Method Summary
`boolean`	`equals(Object object)` Returns whether this job hold until attribute is equivalent to the passed in object.
`Class<? extends Attribute>`	`getCategory()` Get the printing attribute class which is to be used as the "category" for this printing attribute value.
`String`	`getName()` Get the name of the category of which this attribute value is an instance.

Methods inherited from class javax.print.attribute.DateTimeSyntax
`getValue, hashCode, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

JobHoldUntil

public JobHoldUntil(Date dateTime)

Construct a new job hold until date-time attribute with the given Date value.

Parameters:: dateTime - Date value.
Throws:: NullPointerException - (unchecked exception) Thrown if dateTime is null.

Method Detail

equals

public boolean equals(Object object)

Returns whether this job hold until attribute is equivalent to the passed in object. To be equivalent, all of the following conditions must be true:

object is not null.
object is an instance of class JobHoldUntil.
This job hold until attribute's Date value and object's Date value are equal.

Overrides:: equals in class DateTimeSyntax

Parameters:: object - Object to compare to.
Returns:: True if object is equivalent to this job hold until attribute, false otherwise.
See Also:: Object.hashCode(), Hashtable

getCategory

public final Class<? extends Attribute> getCategory()

Get the printing attribute class which is to be used as the "category" for this printing attribute value.

For class JobHoldUntil, the category is class JobHoldUntil itself.

Specified by:: getCategory in interface Attribute

Returns:: Printing attribute class (category), an instance of class java.lang.Class.

getName

public final String getName()

Get the name of the category of which this attribute value is an instance.

For class JobHoldUntil, the category name is "job-hold-until".

Specified by:: getName in interface Attribute

Returns:: Attribute category name.