JDK8/Java8源码在线阅读
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package java.awt.print;
import java.awt.AWTError;
import java.awt.HeadlessException;
import java.util.Enumeration;
import javax.print.DocFlavor;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.StreamPrintServiceFactory;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.Media;
import javax.print.attribute.standard.MediaPrintableArea;
import javax.print.attribute.standard.MediaSize;
import javax.print.attribute.standard.MediaSizeName;
import javax.print.attribute.standard.OrientationRequested;
import sun.security.action.GetPropertyAction;
/**
* The <code>PrinterJob</code> class is the principal class that controls
* printing. An application calls methods in this class to set up a job,
* optionally to invoke a print dialog with the user, and then to print
* the pages of the job.
*/
public abstract class PrinterJob {
/* Public Class Methods */
/**
* Creates and returns a <code>PrinterJob</code> which is initially
* associated with the default printer.
* If no printers are available on the system, a PrinterJob will still
* be returned from this method, but <code>getPrintService()</code>
* will return <code>null</code>, and calling
* {@link #print() print} with this <code>PrinterJob</code> might
* generate an exception. Applications that need to determine if
* there are suitable printers before creating a <code>PrinterJob</code>
* should ensure that the array returned from
* {@link #lookupPrintServices() lookupPrintServices} is not empty.
* @return a new <code>PrinterJob</code>.
*
* @throws SecurityException if a security manager exists and its
* {@link java.lang.SecurityManager#checkPrintJobAccess}
* method disallows this thread from creating a print job request
*/
public static PrinterJob getPrinterJob() {
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkPrintJobAccess();
}
return (PrinterJob) java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction() {
public Object run() {
String nm = System.getProperty("java.awt.printerjob", null);
try {
return (PrinterJob)Class.forName(nm).newInstance();
} catch (ClassNotFoundException e) {
throw new AWTError("PrinterJob not found: " + nm);
} catch (InstantiationException e) {
throw new AWTError("Could not instantiate PrinterJob: " + nm);
} catch (IllegalAccessException e) {
throw new AWTError("Could not access PrinterJob: " + nm);
}
}
});
}
/**
* A convenience method which looks up 2D print services.
* Services returned from this method may be installed on
* <code>PrinterJob</code>s which support print services.
* Calling this method is equivalent to calling
* {@link javax.print.PrintServiceLookup#lookupPrintServices(
* DocFlavor, AttributeSet)
* PrintServiceLookup.lookupPrintServices()}
* and specifying a Pageable DocFlavor.
* @return a possibly empty array of 2D print services.
* @since 1.4
*/
public static PrintService[] lookupPrintServices() {
return PrintServiceLookup.
lookupPrintServices(DocFlavor.SERVICE_FORMATTED.PAGEABLE, null);
}
/**
* A convenience method which locates factories for stream print
* services which can image 2D graphics.
* Sample usage :
* <pre>{@code
* FileOutputStream outstream;
* StreamPrintService psPrinter;
* String psMimeType = "application/postscript";
* PrinterJob pj = PrinterJob.getPrinterJob();
*
* StreamPrintServiceFactory[] factories =
* PrinterJob.lookupStreamPrintServices(psMimeType);
* if (factories.length > 0) {
* try {
* outstream = new File("out.ps");
* psPrinter = factories[0].getPrintService(outstream);
* // psPrinter can now be set as the service on a PrinterJob
* pj.setPrintService(psPrinter)
* } catch (Exception e) {
* e.printStackTrace();
* }
* }
* }</pre>
* Services returned from this method may be installed on
* <code>PrinterJob</code> instances which support print services.
* Calling this method is equivalent to calling
* {@link javax.print.StreamPrintServiceFactory#lookupStreamPrintServiceFactories(DocFlavor, String)
* StreamPrintServiceFactory.lookupStreamPrintServiceFactories()
* } and specifying a Pageable DocFlavor.
*
* @param mimeType the required output format, or null to mean any format.
* @return a possibly empty array of 2D stream print service factories.
* @since 1.4
*/
public static StreamPrintServiceFactory[]
lookupStreamPrintServices(String mimeType) {
return StreamPrintServiceFactory.lookupStreamPrintServiceFactories(
DocFlavor.SERVICE_FORMATTED.PAGEABLE,
mimeType);
}
/* Public Methods */
/**
* A <code>PrinterJob</code> object should be created using the
* static {@link #getPrinterJob() getPrinterJob} method.
*/
public PrinterJob() {
}
/**
* Returns the service (printer) for this printer job.
* Implementations of this class which do not support print services
* may return null. null will also be returned if no printers are
* available.
* @return the service for this printer job.
* @see #setPrintService(PrintService)
* @see #getPrinterJob()
* @since 1.4
*/
public PrintService getPrintService() {
return null;
}
/**
* Associate this PrinterJob with a new PrintService.
* This method is overridden by subclasses which support
* specifying a Print Service.
*
* Throws <code>PrinterException</code> if the specified service
* cannot support the <code>Pageable</code> and
* <code>Printable</code> interfaces necessary to support 2D printing.
* @param service a print service that supports 2D printing
* @exception PrinterException if the specified service does not support
* 2D printing, or this PrinterJob class does not support
* setting a 2D print service, or the specified service is
* otherwise not a valid print service.
* @see #getPrintService
* @since 1.4
*/
public void setPrintService(PrintService service)
throws PrinterException {
throw new PrinterException(
"Setting a service is not supported on this class");
}
/**
* Calls <code>painter</code> to render the pages. The pages in the
* document to be printed by this
* <code>PrinterJob</code> are rendered by the {@link Printable}
* object, <code>painter</code>. The {@link PageFormat} for each page
* is the default page format.
* @param painter the <code>Printable</code> that renders each page of
* the document.
*/
public abstract void setPrintable(Printable painter);
/**
* Calls <code>painter</code> to render the pages in the specified
* <code>format</code>. The pages in the document to be printed by
* this <code>PrinterJob</code> are rendered by the
* <code>Printable</code> object, <code>painter</code>. The
* <code>PageFormat</code> of each page is <code>format</code>.
* @param painter the <code>Printable</code> called to render
* each page of the document
* @param format the size and orientation of each page to
* be printed
*/
public abstract void setPrintable(Printable painter, PageFormat format);
/**
* Queries <code>document</code> for the number of pages and
* the <code>PageFormat</code> and <code>Printable</code> for each
* page held in the <code>Pageable</code> instance,
* <code>document</code>.
* @param document the pages to be printed. It can not be
* <code>null</code>.
* @exception NullPointerException the <code>Pageable</code> passed in
* was <code>null</code>.
* @see PageFormat
* @see Printable
*/
public abstract void setPageable(Pageable document)
throws NullPointerException;
/**
* Presents a dialog to the user for changing the properties of
* the print job.
* This method will display a native dialog if a native print
* service is selected, and user choice of printers will be restricted
* to these native print services.
* To present the cross platform print dialog for all services,
* including native ones instead use
* <code>printDialog(PrintRequestAttributeSet)</code>.
* <p>
* PrinterJob implementations which can use PrintService's will update
* the PrintService for this PrinterJob to reflect the new service
* selected by the user.
* @return <code>true</code> if the user does not cancel the dialog;
* <code>false</code> otherwise.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
public abstract boolean printDialog() throws HeadlessException;
/**
* A convenience method which displays a cross-platform print dialog
* for all services which are capable of printing 2D graphics using the
* <code>Pageable</code> interface. The selected printer when the
* dialog is initially displayed will reflect the print service currently
* attached to this print job.
* If the user changes the print service, the PrinterJob will be
* updated to reflect this, unless the user cancels the dialog.
* As well as allowing the user to select the destination printer,
* the user can also select values of various print request attributes.
* <p>
* The attributes parameter on input will reflect the applications
* required initial selections in the user dialog. Attributes not
* specified display using the default for the service. On return it
* will reflect the user's choices. Selections may be updated by
* the implementation to be consistent with the supported values
* for the currently selected print service.
* <p>
* As the user scrolls to a new print service selection, the values
* copied are based on the settings for the previous service, together
* with any user changes. The values are not based on the original
* settings supplied by the client.
* <p>
* With the exception of selected printer, the PrinterJob state is
* not updated to reflect the user's changes.
* For the selections to affect a printer job, the attributes must
* be specified in the call to the
* <code>print(PrintRequestAttributeSet)</code> method. If using
* the Pageable interface, clients which intend to use media selected
* by the user must create a PageFormat derived from the user's
* selections.
* If the user cancels the dialog, the attributes will not reflect
* any changes made by the user.
* @param attributes on input is application supplied attributes,
* on output the contents are updated to reflect user choices.
* This parameter may not be null.
* @return <code>true</code> if the user does not cancel the dialog;
* <code>false</code> otherwise.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @exception NullPointerException if <code>attributes</code> parameter
* is null.
* @see java.awt.GraphicsEnvironment#isHeadless
* @since 1.4
*
*/
public boolean printDialog(PrintRequestAttributeSet attributes)
throws HeadlessException {
if (attributes == null) {
throw new NullPointerException("attributes");
}
return printDialog();
}
/**
* Displays a dialog that allows modification of a
* <code>PageFormat</code> instance.
* The <code>page</code> argument is used to initialize controls
* in the page setup dialog.
* If the user cancels the dialog then this method returns the
* original <code>page</code> object unmodified.
* If the user okays the dialog then this method returns a new
* <code>PageFormat</code> object with the indicated changes.
* In either case, the original <code>page</code> object is
* not modified.
* @param page the default <code>PageFormat</code> presented to the
* user for modification
* @return the original <code>page</code> object if the dialog
* is cancelled; a new <code>PageFormat</code> object
* containing the format indicated by the user if the
* dialog is acknowledged.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
* @since 1.2
*/
public abstract PageFormat pageDialog(PageFormat page)
throws HeadlessException;
/**
* A convenience method which displays a cross-platform page setup dialog.
* The choices available will reflect the print service currently
* set on this PrinterJob.
* <p>
* The attributes parameter on input will reflect the client's
* required initial selections in the user dialog. Attributes which are
* not specified display using the default for the service. On return it
* will reflect the user's choices. Selections may be updated by
* the implementation to be consistent with the supported values
* for the currently selected print service.
* <p>
* The return value will be a PageFormat equivalent to the
* selections in the PrintRequestAttributeSet.
* If the user cancels the dialog, the attributes will not reflect
* any changes made by the user, and the return value will be null.
* @param attributes on input is application supplied attributes,
* on output the contents are updated to reflect user choices.
* This parameter may not be null.
* @return a page format if the user does not cancel the dialog;
* <code>null</code> otherwise.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @exception NullPointerException if <code>attributes</code> parameter
* is null.
* @see java.awt.GraphicsEnvironment#isHeadless
* @since 1.4
*
*/
public PageFormat pageDialog(PrintRequestAttributeSet attributes)
throws HeadlessException {
if (attributes == null) {
throw new NullPointerException("attributes");
}
return pageDialog(defaultPage());
}
/**
* Clones the <code>PageFormat</code> argument and alters the
* clone to describe a default page size and orientation.
* @param page the <code>PageFormat</code> to be cloned and altered
* @return clone of <code>page</code>, altered to describe a default
* <code>PageFormat</code>.
*/
public abstract PageFormat defaultPage(PageFormat page);
/**
* Creates a new <code>PageFormat</code> instance and
* sets it to a default size and orientation.
* @return a <code>PageFormat</code> set to a default size and
* orientation.
*/
public PageFormat defaultPage() {
return defaultPage(new PageFormat());
}
/**
* Calculates a <code>PageFormat</code> with values consistent with those
* supported by the current <code>PrintService</code> for this job
* (ie the value returned by <code>getPrintService()</code>) and media,
* printable area and orientation contained in <code>attributes</code>.
* <p>
* Calling this method does not update the job.
* It is useful for clients that have a set of attributes obtained from
* <code>printDialog(PrintRequestAttributeSet attributes)</code>
* and need a PageFormat to print a Pageable object.
* @param attributes a set of printing attributes, for example obtained
* from calling printDialog. If <code>attributes</code> is null a default
* PageFormat is returned.
* @return a <code>PageFormat</code> whose settings conform with
* those of the current service and the specified attributes.
* @since 1.6
*/
public PageFormat getPageFormat(PrintRequestAttributeSet attributes) {
PrintService service = getPrintService();
PageFormat pf = defaultPage();
if (service == null || attributes == null) {
return pf;
}
Media media = (Media)attributes.get(Media.class);
MediaPrintableArea mpa =
(MediaPrintableArea)attributes.get(MediaPrintableArea.class);
OrientationRequested orientReq =
(OrientationRequested)attributes.get(OrientationRequested.class);
if (media == null && mpa == null && orientReq == null) {
return pf;
}
Paper paper = pf.getPaper();
/* If there's a media but no media printable area, we can try
* to retrieve the default value for mpa and use that.
*/
if (mpa == null && media != null &&
service.isAttributeCategorySupported(MediaPrintableArea.class)) {
Object mpaVals =
service.getSupportedAttributeValues(MediaPrintableArea.class,
null, attributes);
if (mpaVals instanceof MediaPrintableArea[] &&
((MediaPrintableArea[])mpaVals).length > 0) {
mpa = ((MediaPrintableArea[])mpaVals)[0];
}
}
if (media != null &&
service.isAttributeValueSupported(media, null, attributes)) {
if (media instanceof MediaSizeName) {
MediaSizeName msn = (MediaSizeName)media;
MediaSize msz = MediaSize.getMediaSizeForName(msn);
if (msz != null) {
double inch = 72.0;
double paperWid = msz.getX(MediaSize.INCH) * inch;
double paperHgt = msz.getY(MediaSize.INCH) * inch;
paper.setSize(paperWid, paperHgt);
if (mpa == null) {
paper.setImageableArea(inch, inch,
paperWid-2*inch,
paperHgt-2*inch);
}
}
}
}
if (mpa != null &&
service.isAttributeValueSupported(mpa, null, attributes)) {
float [] printableArea =
mpa.getPrintableArea(MediaPrintableArea.INCH);
for (int i=0; i < printableArea.length; i++) {
printableArea[i] = printableArea[i]*72.0f;
}
paper.setImageableArea(printableArea[0], printableArea[1],
printableArea[2], printableArea[3]);
}
if (orientReq != null &&
service.isAttributeValueSupported(orientReq, null, attributes)) {
int orient;
if (orientReq.equals(OrientationRequested.REVERSE_LANDSCAPE)) {
orient = PageFormat.REVERSE_LANDSCAPE;
} else if (orientReq.equals(OrientationRequested.LANDSCAPE)) {
orient = PageFormat.LANDSCAPE;
} else {
orient = PageFormat.PORTRAIT;
}
pf.setOrientation(orient);
}
pf.setPaper(paper);
pf = validatePage(pf);
return pf;
}
/**
* Returns the clone of <code>page</code> with its settings
* adjusted to be compatible with the current printer of this
* <code>PrinterJob</code>. For example, the returned
* <code>PageFormat</code> could have its imageable area
* adjusted to fit within the physical area of the paper that
* is used by the current printer.
* @param page the <code>PageFormat</code> that is cloned and
* whose settings are changed to be compatible with
* the current printer
* @return a <code>PageFormat</code> that is cloned from
* <code>page</code> and whose settings are changed
* to conform with this <code>PrinterJob</code>.
*/
public abstract PageFormat validatePage(PageFormat page);
/**
* Prints a set of pages.
* @exception PrinterException an error in the print system
* caused the job to be aborted.
* @see Book
* @see Pageable
* @see Printable
*/
public abstract void print() throws PrinterException;
/**
* Prints a set of pages using the settings in the attribute
* set. The default implementation ignores the attribute set.
* <p>
* Note that some attributes may be set directly on the PrinterJob
* by equivalent method calls, (for example), copies:
* <code>setcopies(int)</code>, job name: <code>setJobName(String)</code>
* and specifying media size and orientation though the
* <code>PageFormat</code> object.
* <p>
* If a supported attribute-value is specified in this attribute set,
* it will take precedence over the API settings for this print()
* operation only.
* The following behaviour is specified for PageFormat:
* If a client uses the Printable interface, then the
* <code>attributes</code> parameter to this method is examined
* for attributes which specify media (by size), orientation, and
* imageable area, and those are used to construct a new PageFormat
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