summaryrefslogtreecommitdiff
path: root/libjava/classpath/gnu/javax/print/ipp/IppRequest.java
blob: ae1f2c409b2302c191cfa77b2c57f77155291472 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
/* IppRequest.java --
 Copyright (C) 2006 Free Software Foundation, Inc.

 This file is part of GNU Classpath.

 GNU Classpath is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2, or (at your option)
 any later version.

 GNU Classpath is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with GNU Classpath; see the file COPYING.  If not, write to the
 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 02110-1301 USA.

 Linking this library statically or dynamically with other modules is
 making a combined work based on this library.  Thus, the terms and
 conditions of the GNU General Public License cover the whole
 combination.

 As a special exception, the copyright holders of this library give you
 permission to link this library with independent modules to produce an
 executable, regardless of the license terms of these independent
 modules, and to copy and distribute the resulting executable under
 terms of your choice, provided that you also meet, for each linked
 independent module, the terms and conditions of the license of that
 module.  An independent module is a module which is not derived from
 or based on this library.  If you modify this library, you may extend
 this exception to your version of the library, but you are not
 obligated to do so.  If you do not wish to do so, delete this
 exception statement from your version. */


package gnu.javax.print.ipp;

import gnu.classpath.debug.Component;
import gnu.classpath.debug.SystemLogger;
import gnu.javax.print.ipp.attribute.CharsetSyntax;
import gnu.javax.print.ipp.attribute.NaturalLanguageSyntax;
import gnu.javax.print.ipp.attribute.RequestedAttributes;
import gnu.javax.print.ipp.attribute.job.AttributesCharset;
import gnu.javax.print.ipp.attribute.job.AttributesNaturalLanguage;
import gnu.javax.print.ipp.attribute.job.JobId;
import gnu.javax.print.ipp.attribute.job.JobUri;
import gnu.javax.print.ipp.attribute.printer.DocumentFormat;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URL;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.logging.Logger;

import javax.print.attribute.Attribute;
import javax.print.attribute.AttributeSet;
import javax.print.attribute.DateTimeSyntax;
import javax.print.attribute.EnumSyntax;
import javax.print.attribute.HashAttributeSet;
import javax.print.attribute.IntegerSyntax;
import javax.print.attribute.ResolutionSyntax;
import javax.print.attribute.SetOfIntegerSyntax;
import javax.print.attribute.TextSyntax;
import javax.print.attribute.URISyntax;
import javax.print.attribute.standard.Compression;
import javax.print.attribute.standard.Copies;
import javax.print.attribute.standard.DocumentName;
import javax.print.attribute.standard.Fidelity;
import javax.print.attribute.standard.Finishings;
import javax.print.attribute.standard.JobHoldUntil;
import javax.print.attribute.standard.JobImpressions;
import javax.print.attribute.standard.JobKOctets;
import javax.print.attribute.standard.JobMediaSheets;
import javax.print.attribute.standard.JobName;
import javax.print.attribute.standard.JobOriginatingUserName;
import javax.print.attribute.standard.JobPriority;
import javax.print.attribute.standard.JobSheets;
import javax.print.attribute.standard.Media;
import javax.print.attribute.standard.MultipleDocumentHandling;
import javax.print.attribute.standard.NumberUp;
import javax.print.attribute.standard.OrientationRequested;
import javax.print.attribute.standard.PageRanges;
import javax.print.attribute.standard.PrintQuality;
import javax.print.attribute.standard.PrinterResolution;
import javax.print.attribute.standard.PrinterURI;
import javax.print.attribute.standard.RequestingUserName;
import javax.print.attribute.standard.SheetCollate;
import javax.print.attribute.standard.Sides;

/**
 * <code>IppRequest</code> models a request to an IPP compatible
 * server as described in RFC 2910 - IPP/1.1: Encoding and Transport.
 * <p>
 * The byte stream is structured as follows (for an official description
 * please have a look at the RFC document mentioned above):
 * <ul>
 * <li>version-number          - 2 bytes - required</li>
 * <li>operation-id            - 2 bytes - required</li>
 * <li>request-id              - 4 bytes - required</li>
 * <li>attribute-group         - n bytes - 0 or more</li>
 * <li>end-of-attributes-tag   - 1 byte  - required</li>
 * <li>data                    - q bytes - optional</li>
 * </ul>
 * </p>
 *
 * @author Wolfgang Baer (WBaer@gmx.de)
 */
public class IppRequest
{

  /**
   * The printer-poll timeout.
   */
  private static final int timeout = 1000;

  /**
   * Helper class used to write the attributes of a request
   * into the supplied data output stream in the correct way.
   *
   * @author Wolfgang Baer (WBaer@gmx.de)
   */
  class RequestWriter
  {
    private DataOutputStream out;

    /**
     * Creates a RequestWriter.
     *
     * @param stream the stream to write to.
     */
    RequestWriter(DataOutputStream stream)
    {
      out = stream;
    }

    /**
     * Writes an attribute in IntegerSyntax into the stream.
     * @param attribute the attribute
     * @throws IOException if thrown by the stream
     */
    private void write(IntegerSyntax attribute) throws IOException
    {
      String name = ((Attribute) attribute).getName();
      out.writeByte(IppValueTag.INTEGER);
      out.writeShort(name.length());
      out.write(name.getBytes());
      out.writeShort(4); // length, integer is 4 bytes
      out.writeInt(attribute.getValue());
    }

    /**
     * Writes an attribute in EnumSyntax into the stream.
     * @param attribute the attribute
     * @throws IOException if thrown by the stream
     */
    private void write(EnumSyntax attribute) throws IOException
    {
      // in JPS API enum syntax is used for enums, keyword and boolean types
      String name = ((Attribute) attribute).getName();

      // the enum value types
      if (attribute instanceof Finishings
          || attribute instanceof OrientationRequested
          || attribute instanceof PrintQuality)
        {
          out.writeByte(IppValueTag.ENUM);
          out.writeShort(name.length());
          out.write(name.getBytes());
          out.writeShort(4); // length, enum is 4 bytes
          out.writeInt(attribute.getValue());
        }
      // the boolean value type
      else if (attribute instanceof Fidelity)
        {
          out.writeByte(IppValueTag.BOOLEAN);
          out.writeShort(name.length());
          out.write(name.getBytes());
          out.writeShort(1); // length, boolean is 1 bytes
          out.writeByte(attribute.getValue() == 0 ? 0x00 : 0x01);
        }
      // the keyword value types
      else
        {
          String keyword = attribute.toString();
          out.writeByte(IppValueTag.KEYWORD);
          out.writeShort(name.length());
          out.write(name.getBytes());
          out.writeShort(keyword.length());
          out.write(keyword.getBytes());
        }
    }

    /**
     * Writes an attribute in SetOfIntegerSyntax into the stream.
     * @param attribute the attribute
     * @throws IOException if thrown by the stream
     */
    private void write(SetOfIntegerSyntax attribute) throws IOException
    {
      String name = ((Attribute) attribute).getName();
      int[][] ranges = attribute.getMembers();
      for (int i = 0; i < ranges.length; i++)
        {
          out.writeByte(IppValueTag.RANGEOFINTEGER);
          if (i == 0)
            {
              out.writeShort(name.length());
              out.write(name.getBytes());
            }
          else
            out.writeShort(0x0000); // only name-length

          out.writeShort(8); // range is 8 bytes
          out.writeInt(ranges[i][0]);
          out.writeInt(ranges[i][1]);
        }
    }

    /**
     * Writes an attribute in ResolutionSyntax into the stream.
     * @param attribute the attribute
     * @throws IOException if thrown by the stream
     */
    private void write(ResolutionSyntax attribute) throws IOException
    {
      String name = ((Attribute) attribute).getName();
      out.writeByte(IppValueTag.RESOLUTION);
      out.writeShort(name.length());
      out.write(name.getBytes());
      out.writeShort(9); // length fixed to 9
      out.writeInt(attribute.getCrossFeedResolution(ResolutionSyntax.DPI));
      out.writeInt(attribute.getFeedResolution(ResolutionSyntax.DPI));
      out.writeByte(ResolutionSyntax.DPI);
    }

    /**
     * Writes an attribute in DateTimeSyntax into the stream.
     * <p>
     * The syntax value is defined as 11 octets follwing the
     * DateAndTime format of RFC 1903. (see IppResponse)
     * </p>
     *
     * @param attribute the attribute
     * @throws IOException if thrown by the stream
     */
    private void write(DateTimeSyntax attribute) throws IOException
    {
      String name = ((Attribute) attribute).getName();
      out.writeByte(IppValueTag.DATETIME);
      out.writeShort(name.length());
      out.write(name.getBytes());
      out.writeShort(11); // length fixed to 11

      Date date = attribute.getValue();
      Calendar cal = new GregorianCalendar();
      cal.setTime(date);

      out.writeShort(cal.get(Calendar.YEAR));
      out.writeByte(cal.get(Calendar.MONTH));
      out.writeByte(cal.get(Calendar.DAY_OF_MONTH));
      out.writeByte(cal.get(Calendar.HOUR_OF_DAY));
      out.writeByte(cal.get(Calendar.MINUTE));
      int second = cal.get(Calendar.SECOND);
      out.writeByte(second == 0 ? 60 : second);
      out.writeByte(cal.get(Calendar.MILLISECOND) / 100);

      int offsetInMillis = cal.get(Calendar.ZONE_OFFSET);
      char directionFromUTC = '+';
      if (offsetInMillis < 0)
        {
          directionFromUTC = '-';
          offsetInMillis = offsetInMillis * (-1);
        }

      out.writeByte(directionFromUTC);
      out.writeByte(offsetInMillis / 3600000); // hours
      out.writeByte((offsetInMillis % 3600000) / 60000); // minutes
    }

    /**
     * Writes an attribute in TextSyntax into the stream.
     * <p>
     * By default attributes are qritten as TEXT_WITHOUT_LANGUAGE value-tag.
     * As some attributes in the JPS are TextSyntax attributes but actually
     * of NAME value-tag in IPP this method checks for these attributes and
     * writes them as NAME_WITHOUT_LANGUAGE value-tag into the stream.
     * </p>
     *
     * @param attribute the attribute
     * @param out the stream to write to
     * @throws IOException if thrown by the stream
     */
    private void write(TextSyntax attribute) throws IOException
    {
      // We only use *WithoutLanguage, correct according to spec.
      String name = ((Attribute) attribute).getName();

      if (attribute instanceof RequestingUserName
          || attribute instanceof JobName
          || attribute instanceof DocumentName
          || attribute instanceof JobOriginatingUserName)
        out.writeByte(IppValueTag.NAME_WITHOUT_LANGUAGE);
      else if (attribute instanceof DocumentFormat)
        out.writeByte(IppValueTag.MIME_MEDIA_TYPE);
      else
        out.writeByte(IppValueTag.TEXT_WITHOUT_LANGUAGE);

      out.writeShort(name.length());
      out.write(name.getBytes());
      out.writeShort(attribute.getValue().length());
      out.write(attribute.getValue().getBytes());
    }

    /**
     * Writes an attribute in URISyntax into the stream.
     * @param attribute the attribute
     * @param out the stream to write to
     * @throws IOException if thrown by the stream
     */
    private void write(URISyntax attribute) throws IOException
    {
      // only uriScheme syntax type should not appear
      // in a request (reference-uri-schemes-supported)
      String name = ((Attribute) attribute).getName();
      String uriAscii = attribute.getURI().toASCIIString();
      out.writeByte(IppValueTag.URI);
      out.writeShort(name.length());
      out.write(name.getBytes());
      out.writeShort(uriAscii.length());
      out.write(uriAscii.getBytes());
    }

    /**
     * Writes an attribute in CharsetSyntax into the stream.
     * @param attribute the attribute
     * @param out the stream to write to
     * @throws IOException if thrown by the stream
     */
    private void write(CharsetSyntax attribute) throws IOException
    {
      String name = ((Attribute) attribute).getName();
      out.writeByte(IppValueTag.CHARSET);
      out.writeShort(name.length());
      out.write(name.getBytes());
      out.writeShort(attribute.getValue().length());
      out.write(attribute.getValue().getBytes());
    }

    /**
     * Writes an attribute in NaturalLanguageSyntax into the stream.
     * @param attribute the attribute
     * @param out the stream to write to
     * @throws IOException if thrown by the stream
     */
    private void write(NaturalLanguageSyntax attribute) throws IOException
    {
      String name = ((Attribute) attribute).getName();
      out.writeByte(IppValueTag.NATURAL_LANGUAGE);
      out.writeShort(name.length());
      out.write(name.getBytes());
      out.writeShort(attribute.getValue().length());
      out.write(attribute.getValue().getBytes());
    }

    /**
     * Writes an attribute in RequestedAttributes into the stream.
     * @param attribute the attribute
     * @param out the stream to write to
     * @throws IOException if thrown by the stream
     */
    private void write(RequestedAttributes attribute) throws IOException
    {
      String[] values = attribute.getValues();

      String name = ((Attribute) attribute).getName();
      out.writeByte(IppValueTag.KEYWORD);
      out.writeShort(name.length());
      out.write(name.getBytes());
      out.writeShort(values[0].length());
      out.write(values[0].getBytes());

      for (int i=1; i < values.length; i++)
        {
          out.writeByte(IppValueTag.KEYWORD);
          out.writeShort(0x0000); // length for additional value
          out.writeShort(values[i].length());
          out.write(values[i].getBytes());
        }
    }


    /**
     * Writes the given operation attribute group of the given map instance
     * (key=group, values=set of attributes) into the supplied data
     * output stream.
     *
     * @param attributes the set with the attributes.
     *
     * @throws IOException if thrown by the used DataOutputStream.
     * @throws IppException if unknown attributes occur.
     */
    public void writeOperationAttributes(AttributeSet attributes)
        throws IOException, IppException
    {
      out.write(IppDelimiterTag.OPERATION_ATTRIBUTES_TAG);

      // its essential to write these two in this order and as first ones
      Attribute att = attributes.get(AttributesCharset.class);
      write((CharsetSyntax) att);

      logger.log(Component.IPP, "Attribute: Name: <"
        + att.getCategory().getName() + "> Value: <" + att.toString() + ">");

      attributes.remove(AttributesCharset.class);

      att = attributes.get(AttributesNaturalLanguage.class);
      write((NaturalLanguageSyntax) att);
      attributes.remove(AttributesNaturalLanguage.class);

      logger.log(Component.IPP, "Attribute: Name: <"
        + att.getCategory().getName() + "> Value: <" + att.toString() + ">");

      // furthermore its essential to now write out the target attribute
      PrinterURI printerUri = (PrinterURI) attributes.get(PrinterURI.class);
      JobUri jobUri = (JobUri) attributes.get(JobUri.class);
      JobId jobId = (JobId) attributes.get(JobId.class);
      RequestedAttributes reqAttrs
        = (RequestedAttributes)attributes.get(RequestedAttributes.class);
      if (printerUri != null && jobId == null && jobUri == null)
        {
          write(printerUri);
          attributes.remove(PrinterURI.class);
          logger.log(Component.IPP, "Attribute: Name: <" + printerUri
            .getCategory().getName() + "> Value: <" + printerUri.toString() + ">");
        }
      else if (jobUri != null && jobId == null && printerUri == null)
        {
          write(jobUri);
          attributes.remove(JobUri.class);
          logger.log(Component.IPP, "Attribute: Name: <" + jobUri
            .getCategory().getName() + "> Value: <" + jobUri.toString() + ">");
        }
      else if (printerUri != null && jobId != null && jobUri == null)
        {
          write(printerUri); // must be third
          write(jobId);
          attributes.remove(PrinterURI.class);
          attributes.remove(JobId.class);
          logger.log(Component.IPP, "Attribute: Name: <" + printerUri
            .getCategory().getName() + "> Value: <" + printerUri.toString() + ">");
          logger.log(Component.IPP, "Attribute: Name: <" + jobId.getCategory()
            .getName() + "> Value: <" + jobId.toString() + ">");
        }
      else if (jobUri != null && jobId != null)
        {
          write(jobUri);
          attributes.remove(JobUri.class);
          attributes.remove(JobId.class); // MUST NOT redundant
          logger.log(Component.IPP, "Attribute: Name: <" + jobUri.getCategory()
            .getName() + "> Value: <" + jobUri.toString() + ">");
        }
      else if (reqAttrs != null)
        {
          write(reqAttrs);
          attributes.remove(RequestedAttributes.class);
          logger.log(Component.IPP, "RequestedAttributes: <" + reqAttrs + ">");
        }
      else
        {
          throw new IppException("Unknown target operation attribute combination.");
        }

      writeAttributes(attributes);
    }

    /**
     * Writes the given attribute groups of the given map instance
     * (key=group, values=set of attributes) into the supplied data
     * output stream.
     *
     * @param attributes the set with the attributes.
     *
     * @throws IOException if thrown by the used DataOutputStream.
     * @throws IppException if unknown attributes occur.
     */
    public void writeAttributes(AttributeSet attributes)
        throws IOException, IppException
    {
      Attribute[] attributeArray = attributes.toArray();
      for (int i = 0; i < attributeArray.length; i++)
        {
          logger.log(Component.IPP, "Attribute: Name: <" + attributeArray[i]
            .getCategory().getName() + "> Value: <"
            + attributeArray[i].toString() + ">");

          if (attributeArray[i] instanceof IntegerSyntax)
            write((IntegerSyntax) attributeArray[i]);
          else if (attributeArray[i] instanceof TextSyntax)
            write((TextSyntax) attributeArray[i]);
          else if (attributeArray[i] instanceof DateTimeSyntax)
            write((DateTimeSyntax) attributeArray[i]);
          else if (attributeArray[i] instanceof ResolutionSyntax)
            write((ResolutionSyntax) attributeArray[i]);
          else if (attributeArray[i] instanceof SetOfIntegerSyntax)
            write((SetOfIntegerSyntax) attributeArray[i]);
          else if (attributeArray[i] instanceof EnumSyntax)
            write((EnumSyntax) attributeArray[i]);
          else if (attributeArray[i] instanceof URISyntax)
            write((URISyntax) attributeArray[i]);
          else if (attributeArray[i] instanceof CharsetSyntax)
            write((CharsetSyntax) attributeArray[i]);
          else if (attributeArray[i] instanceof NaturalLanguageSyntax)
            write((NaturalLanguageSyntax) attributeArray[i]);
          else if (attributeArray[i] instanceof RequestedAttributes)
            write((RequestedAttributes) attributeArray[i]);
          else
            throw new IppException("Unknown syntax type");
        }
    }

  }

  /**
   * Logger for tracing - enable by passing
   * -Dgnu.classpath.debug.components=ipp to the vm.
   */
  static final Logger logger = SystemLogger.SYSTEM;

  /**
   * The request id counter simply counts up
   * to give unique request ids per JVM instance.
   */
  private static int requestIdCounter = 1;

  /** The IPP version defaults to 1.1 */
  private static final short VERSION = 0x0101;

  /** Signals if the request is already on its way */
  private boolean alreadySent = false;

  /** The operation type of this request. */
  private short operation_id;

  /**
   * The request id of this request. This is
   * assigned automatically by the constructor.
   */
  private final int request_id;

  private AttributeSet operationAttributes;

  private AttributeSet printerAttributes;

  private AttributeSet jobAttributes;

  private Object data;

  private URI requestUri;

  /** The underlying connection - IPP is http based */
  private HttpURLConnection  connection;

  /**
   * Creates an IPPRequest instance.
   *
   * @param uri the URI of the request
   * @param user the user if any
   * @param password the password of the supplied user
   */
  public IppRequest(URI uri, String user, String password)
  {
    request_id = incrementRequestIdCounter();
    requestUri = uri;

    try
      {
        URL url = new URL("http",
                      user == null
                      ? uri.getHost() : user + ":"
                      + password + "@" + uri.getHost(),
                      uri.getPort(), uri.getPath());

        connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);

        connection.setRequestProperty("Content-type", "application/ipp");
        connection.setRequestProperty("Accept", "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2");
      }
    catch (IOException e)
      {
        // MalformedURLException - uri is already checked
        // ProtocolException - POST is correct method type
        // IOException -HTTPURLConnection constructor actually
        // does never throw this exception.
        logger.log(Component.IPP, "Unexpected IOException", e);
      }

    logger.log(Component.IPP, "[IppConnection] Host: " + uri.getHost()
                              + " Port: " + uri.getPort() + " Path: "
                              + uri.getPath());
  }

  /**
   * Synchronized method to be called by the constructor
   * to assign a unique request id to this request.
   *
   * @return The unique request id.
   */
  private synchronized int incrementRequestIdCounter()
  {
    return IppRequest.requestIdCounter++;
  }

  /**
   * Returns the id of this request.
   *
   * @return The request ID.
   */
  public int getRequestID()
  {
    return request_id;
  }

  /**
   * Sets the data of the request. The data used in this
   * request will be the one of the supplied inputstream
   * instead of the alternative byte array possibility.
   *
   * @param stream the input stream to use for the data.
   */
  public void setData(InputStream stream)
  {
    data = stream;
  }

  /**
   * Sets the data of the request. The data used in this
   * request will be the one of the supplied byte[]
   * instead of the alternative input stream possibility.
   *
   * @param bytes the byte[] to use for the data.
   */
  public void setData(byte[] bytes)
  {
    data = bytes;
  }

  /**
   * Sets the operation id for this request.
   *
   * @param id the operation id.
   */
  public void setOperationID(short id)
  {
    operation_id = id;
  }

  /**
   * Adds the default values for the operation
   * attributes "attributes-charset" and
   * "attributes-natural-language"
   */
  public void setOperationAttributeDefaults()
  {
    if (operationAttributes == null)
      operationAttributes = new HashAttributeSet();

    operationAttributes.add(AttributesCharset.UTF8);
    operationAttributes.add(AttributesNaturalLanguage.EN);
  }

  /**
   * Add the job attribute of this request to the given
   * attribute set.
   *
   * @param attribute the job attribute.
   */
  public void addJobAttribute(Attribute attribute)
  {
    if (jobAttributes == null)
      jobAttributes = new HashAttributeSet();

    jobAttributes.add(attribute);
  }

  /**
   * Sets the printer attribute of this request to the given
   * attribute set.
   *
   * @param attribute the printer attribute.
   */
  public void addPrinterAttributes(Attribute attribute)
  {
    if (printerAttributes == null)
      printerAttributes = new HashAttributeSet();

    printerAttributes.add(attribute);
  }

  /**
   * Adds the given attribute to the operation attributes set.
   *
   * @param attribute the operation attribute to add.
   */
  public void addOperationAttribute(Attribute attribute)
  {
    if (operationAttributes == null)
      operationAttributes = new HashAttributeSet();

    operationAttributes.add(attribute);
  }

  /**
   * Filters from the given attribute set the job operation out
   * and adds them to the operation attributes set.
   *
   * @param set the attributes to filter, may not be <code>null</code>.
   */
  public void addAndFilterJobOperationAttributes(AttributeSet set)
  {
    if (operationAttributes == null)
      operationAttributes = new HashAttributeSet();

    // document-natural-language - not defined in JPS attributes
    // document-format - specified outside, special treatment
    Attribute[] tmp = set.toArray();
    for (int i = 0; i < tmp.length; i++)
      {
        if (tmp[i].getCategory().equals(JobName.class)
            || tmp[i].getCategory().equals(Fidelity.class)
            || tmp[i].getCategory().equals(JobImpressions.class)
            || tmp[i].getCategory().equals(JobKOctets.class)
            || tmp[i].getCategory().equals(JobMediaSheets.class)
            || tmp[i].getCategory().equals(Compression.class)
            || tmp[i].getCategory().equals(DocumentName.class)
            || tmp[i].getCategory().equals(RequestingUserName.class))

          operationAttributes.add(tmp[i]);
      }
  }

  /**
   * Filters from the given attribute set the job template attributes
   * out and adds them to the job attributes set.
   *
   * @param set the attributes to filter, may not be <code>null</code>.
   */
  public void addAndFilterJobTemplateAttributes(AttributeSet set)
  {
    if (jobAttributes == null)
      jobAttributes = new HashAttributeSet();

    // document-natural-language - not defined in JPS attributes
    // document-format - specified outside, special treatment
    Attribute[] tmp = set.toArray();
    for (int i = 0; i < tmp.length; i++)
      {
        if (tmp[i].getCategory().equals(JobPriority.class)
            || tmp[i].getCategory().equals(JobHoldUntil.class)
            || tmp[i].getCategory().equals(JobSheets.class)
            || tmp[i].getCategory().equals(MultipleDocumentHandling.class)
            || tmp[i].getCategory().equals(Copies.class)
            || tmp[i].getCategory().equals(Finishings.class)
            || tmp[i].getCategory().equals(PageRanges.class)
            || tmp[i].getCategory().equals(NumberUp.class)
            || tmp[i].getCategory().equals(OrientationRequested.class)
            || tmp[i].getCategory().equals(Media.class)
            || tmp[i].getCategory().equals(PrinterResolution.class)
            || tmp[i].getCategory().equals(PrintQuality.class)
            || tmp[i].getCategory().equals(SheetCollate.class)
            || tmp[i].getCategory().equals(Sides.class))

          jobAttributes.add(tmp[i]);
      }
  }

  /**
   * Does some validation of the supplied parameters and then
   * sends the request to the ipp server or service.
   *
   * @return The response if any.
   *
   * @throws IllegalStateException if request is already sent
   * @throws IppException if connection or request failed.
   * @throws IOException if writing of the header, attributes or footer fails.
   */
  public IppResponse send() throws IppException, IOException
  {
    if (alreadySent)
      throw new IllegalStateException("Request is already sent");

    alreadySent = true;

    OutputStream stream = connection.getOutputStream();
    DataOutputStream out = new DataOutputStream(stream);

    //  the header 8 bytes long
    out.writeShort(VERSION);
    out.writeShort(operation_id);
    out.writeInt(request_id);

    logger.log(Component.IPP, "OperationID: " + Integer.toHexString(operation_id)
      + " RequestID: " + request_id);

    // Pass stuff the the attribute writer which knows how to
    // write the attributes in correct order
    logger.log(Component.IPP, "Operation Attributes");

    RequestWriter writer = new RequestWriter(out);
    writer.writeOperationAttributes(operationAttributes);

    if (jobAttributes != null)
      {
        logger.log(Component.IPP, "Job Attributes");
        out.write(IppDelimiterTag.JOB_ATTRIBUTES_TAG);
        writer.writeAttributes(jobAttributes);
      }
    if (printerAttributes != null)
      {
        logger.log(Component.IPP, "Printer Attributes");
        out.write(IppDelimiterTag.PRINTER_ATTRIBUTES_TAG);
        writer.writeAttributes(printerAttributes);
      }

    // write the delimiter to the data
    out.write(IppDelimiterTag.END_OF_ATTRIBUTES_TAG);

    // check if data is byte[] or inputstream
    if (data instanceof InputStream)
      {
        byte[] readbuf = new byte[2048];
        int len = 0;
        while( (len = ((InputStream) data).read(readbuf)) > 0)
          out.write(readbuf, 0, len);
      }
    else if (data != null)
      {
        out.write((byte[]) data);
      }

    out.flush();
    stream.flush();

    // Set the connection timeout, for if the printer is offline.
    // FIXME: The print services polling should probably be done in its
    // own thread.
    connection.setConnectTimeout( timeout );

    int responseCode = connection.getResponseCode();

    if (responseCode == HttpURLConnection.HTTP_OK)
      {
        IppResponse response = new IppResponse(requestUri, operation_id);
        response.setResponseData(connection.getInputStream());
        return response;
      }

    logger.log(Component.IPP, "HTTP-Statuscode: " + responseCode);

    throw new IppException("Request failed got HTTP status code "
                           + responseCode);
  }

}