1 files changed, 113 insertions, 0 deletions
diff --git a/src/main/java/org/pdfbox/util/operator/Invoke.java b/src/main/java/org/pdfbox/util/operator/Invoke.java
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+++ b/src/main/java/org/pdfbox/util/operator/Invoke.java
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+/**
+ * Copyright (c) 2005, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.util.operator;
+
+import org.apache.log4j.Logger;
+import org.pdfbox.cos.COSName;
+import org.pdfbox.cos.COSStream;
+import org.pdfbox.pdmodel.PDPage;
+import org.pdfbox.pdmodel.PDResources;
+import org.pdfbox.pdmodel.graphics.xobject.PDXObject;
+import org.pdfbox.pdmodel.graphics.xobject.PDXObjectForm;
+import org.pdfbox.util.PDFOperator;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.Map;
+
+/**
+ * Invoke named XObject.
+ * 
+ * @author Ben Litchfield (ben@benlitchfield.com)
+ * @author Mario Ivankovits
+ * 
+ * @version $Revision: 1.6 $
+ */
+public class Invoke extends OperatorProcessor
+{
+    private static final Logger LOG = Logger.getLogger(Invoke.class);
+
+    private Set inProcess = new TreeSet();
+
+    /**
+     * process : Do - Invoke a named xobject.
+     * @param operator The operator that is being executed.
+     * @param arguments List
+     *
+     * @throws IOException If there is an error processing this operator.
+     */
+    public void process(PDFOperator operator, List arguments) throws IOException
+    {
+        COSName name = (COSName) arguments.get( 0 );
+        if (LOG.isDebugEnabled())
+        {
+            LOG.debug("<Do name=\"" + name.getName() + "\">");
+        }
+
+        // wprinz: allow recursive processing so that nested xobject forms are correctly dealt with
+//        if (inProcess.contains(name))
+//        {
+//            // avoid recursive loop
+//            return;
+//        }
+        // /wprinz
+
+        inProcess.add(name);
+
+        try
+        {
+            //PDResources res = context.getResources();
+
+            Map xobjects = context.getXObjects();
+            PDXObject xobject = (PDXObject) xobjects.get(name.getName());
+
+            if(xobject instanceof PDXObjectForm)
+            {
+                PDXObjectForm form = (PDXObjectForm)xobject;
+                COSStream invoke = (COSStream)form.getCOSObject();
+                PDResources pdResources = form.getResources();
+                PDPage page = context.getCurrentPage();
+                if(pdResources == null)
+                {
+                    pdResources = page.findResources();
+                }
+
+                getContext().processSubStream( page, pdResources, invoke );
+            }
+        }
+        finally
+        {
+            inProcess.remove(name);
+        }
+    }
+}