APPENDIX F

Example: PrintGIF.java

/*
* Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved.
*
* This software is the proprietary information of Oracle.
* Use is subject to license terms.
*
*/

import java.io.*;
import javax.print.*;
import javax.print.attribute.*;
import javax.print.attribute.standard.*;

/*
*  Use the Java(TM) Print Service API to locate a print service which
*  can print a GIF-encoded image. A GIF image is printed according to
*  a job template specified as a set of printing attributes.
*/
public class PrintGIF {

        public static void main(String args[]) {

                /* Use the pre-defined flavor for a GIF from an InputStream */
                DocFlavor flavor = DocFlavor.INPUT_STREAM.GIF;

                /* Create a set which specifies how the job is to be printed */
                PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
                aset.add(MediaSizeName.NA_LETTER);
                aset.add(new Copies(1));

                /* Locate print services which can print a GIF in the manner specified */
                PrintService[] pservices =
                        PrintServiceLookup.lookupPrintServices(flavor, aset);

                if (pservices.length > 0) {
                        /* Create a Print Job */
                        DocPrintJob printJob = pservices[0].createPrintJob();

                        /* Create a Doc implementation to pass the print data */
                        Doc doc = new InputStreamDoc("java2dlogo.gif", flavor);

                        /* Print the doc as specified */
                        try {
                                printJob.print(doc, aset);
                        } catch (PrintException e) { 
                                System.err.println(e);
                        }
                } else {
                        System.err.println("No suitable printers");
                }
        }
}

class InputStreamDoc implements Doc {
        private String filename;
        private DocFlavor docFlavor;
        private InputStream stream;

        public InputStreamDoc(String name, DocFlavor flavor) {
                filename = name;
                docFlavor = flavor;
        }
   
        public DocFlavor getDocFlavor() { 
                return docFlavor;
        }

        /* No attributes attached to this Doc - mainly useful for MultiDoc */
        public DocAttributeSet getAttributes() {
                return null;
        }

        /* Since the data is to be supplied as an InputStream delegate to
        * getStreamForBytes().
        */
        public Object getPrintData() throws IOException {
                return getStreamForBytes();
        }

        /* Not possible to return a GIF as text */
        public Reader getReaderForText()
                throws UnsupportedEncodingException, IOException {
        return null;
        }

        /* Return the print data as an InputStream.
        * Always return the same instance.
        */
        public InputStream getStreamForBytes() throws IOException {
                synchronized(this) {
                        if (stream == null) {
                                stream = new FileInputStream(filename);
                        }
                        return stream;
                } 
        }
}
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