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Java > Open Source Codes > org > pdfbox > util > operator > Invoke


1 /**
2  * Copyright (c) 2005, www.pdfbox.org
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright notice,
9  * this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  * 3. Neither the name of pdfbox; nor the names of its
14  * contributors may be used to endorse or promote products derived from this
15  * software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20  * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  * http://www.pdfbox.org
29  *
30  */
31 package org.pdfbox.util.operator;
32
33 import org.pdfbox.cos.COSName;
34 import org.pdfbox.cos.COSStream;
35 import org.pdfbox.pdmodel.PDPage;
36 import org.pdfbox.pdmodel.PDResources;
37 import org.pdfbox.pdmodel.graphics.xobject.PDXObject;
38 import org.pdfbox.pdmodel.graphics.xobject.PDXObjectForm;
39 import org.pdfbox.util.PDFOperator;
40
41 import java.io.IOException JavaDoc;
42 import java.util.List JavaDoc;
43 import java.util.Set JavaDoc;
44 import java.util.TreeSet JavaDoc;
45 import java.util.Map JavaDoc;
46
47 /**
48  * Invoke named XObject.
49  *
50  * @author <a HREF="mailto:ben@benlitchfield.com">Ben Litchfield</a>
51  * @author Mario Ivankovits
52  *
53  * @version $Revision: 1.8 $
54  */
55 public class Invoke extends OperatorProcessor
56 {
57     private Set JavaDoc inProcess = new TreeSet JavaDoc();
58
59     /**
60      * process : Do - Invoke a named xobject.
61      * @param operator The operator that is being executed.
62      * @param arguments List
63      *
64      * @throws IOException If there is an error processing this operator.
65      */
66     public void process(PDFOperator operator, List JavaDoc arguments) throws IOException JavaDoc
67     {
68         COSName name = (COSName) arguments.get( 0 );
69
70         if (inProcess.contains(name))
71         {
72             // avoid recursive loop
73 return;
74         }
75
76         inProcess.add(name);
77
78         try
79         {
80             //PDResources res = context.getResources();
81
82             Map JavaDoc xobjects = context.getXObjects();
83             PDXObject xobject = (PDXObject) xobjects.get(name.getName());
84
85             if(xobject instanceof PDXObjectForm)
86             {
87                 PDXObjectForm form = (PDXObjectForm)xobject;
88                 COSStream invoke = (COSStream)form.getCOSObject();
89                 PDResources pdResources = form.getResources();
90                 PDPage page = context.getCurrentPage();
91                 if(pdResources == null)
92                 {
93                     pdResources = page.findResources();
94                 }
95
96                 getContext().processSubStream( page, pdResources, invoke );
97             }
98         }
99         finally
100         {
101             inProcess.remove(name);
102         }
103     }
104 }
105
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