01: /**
02: * Copyright (c) 2005, www.pdfbox.org
03: * All rights reserved.
04: *
05: * Redistribution and use in source and binary forms, with or without
06: * modification, are permitted provided that the following conditions are met:
07: *
08: * 1. Redistributions of source code must retain the above copyright notice,
09: * 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: */package org.pdfbox.util.operator;
31:
32: import org.pdfbox.cos.COSName;
33: import org.pdfbox.cos.COSStream;
34: import org.pdfbox.pdmodel.PDPage;
35: import org.pdfbox.pdmodel.PDResources;
36: import org.pdfbox.pdmodel.graphics.xobject.PDXObject;
37: import org.pdfbox.pdmodel.graphics.xobject.PDXObjectForm;
38: import org.pdfbox.util.PDFOperator;
39:
40: import java.io.IOException;
41: import java.util.List;
42: import java.util.Set;
43: import java.util.TreeSet;
44: import java.util.Map;
45:
46: /**
47: * Invoke named XObject.
48: *
49: * @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
50: * @author Mario Ivankovits
51: *
52: * @version $Revision: 1.8 $
53: */
54: public class Invoke extends OperatorProcessor {
55: private Set inProcess = new TreeSet();
56:
57: /**
58: * process : Do - Invoke a named xobject.
59: * @param operator The operator that is being executed.
60: * @param arguments List
61: *
62: * @throws IOException If there is an error processing this operator.
63: */
64: public void process(PDFOperator operator, List arguments)
65: throws IOException {
66: COSName name = (COSName) arguments.get(0);
67:
68: if (inProcess.contains(name)) {
69: // avoid recursive loop
70: return;
71: }
72:
73: inProcess.add(name);
74:
75: try {
76: //PDResources res = context.getResources();
77:
78: Map xobjects = context.getXObjects();
79: PDXObject xobject = (PDXObject) xobjects
80: .get(name.getName());
81:
82: if (xobject instanceof PDXObjectForm) {
83: PDXObjectForm form = (PDXObjectForm) xobject;
84: COSStream invoke = (COSStream) form.getCOSObject();
85: PDResources pdResources = form.getResources();
86: PDPage page = context.getCurrentPage();
87: if (pdResources == null) {
88: pdResources = page.findResources();
89: }
90:
91: getContext()
92: .processSubStream(page, pdResources, invoke);
93: }
94: } finally {
95: inProcess.remove(name);
96: }
97: }
98: }
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