ANDROID-45 - added BareXmlParserFactory as a workaround for UnsupportedOperationException

Author: Simon Kapl

app/src/main/java/com/itextpdf/android/app/ui/PdfViewerActivity.kt

@@ -47,7 +47,6 @@ class PdfViewerActivity : AppCompatActivity() {
                                     this.fileName = fileName
                                     displayFileName = true
                                     pageSpacing = 100
-                                    enableAnnotationRendering = false
                                     enableDoubleTapZoom = false
                                     primaryColor = "#295819"
                                     secondaryColor = "#950178"

library/src/main/java/com/itextpdf/android/library/PdfActivity.kt

@@ -2,7 +2,6 @@ package com.itextpdf.android.library
 
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
-import com.itextpdf.android.library.R
 import com.itextpdf.android.library.util.FileUtil
 
 

library/src/main/java/com/itextpdf/android/library/util/PdfManipulatorImpl.kt

@@ -7,6 +7,7 @@ import androidx.core.net.toUri
 import com.itextpdf.android.library.R
 import com.itextpdf.android.library.extensions.getPageIndex
 import com.itextpdf.android.library.extensions.isSameAs
+import com.itextpdf.android.library.xmlparser.BareXmlParserFactory
 import com.itextpdf.io.image.ImageDataFactory
 import com.itextpdf.kernel.colors.Color
 import com.itextpdf.kernel.geom.Rectangle
@@ -19,6 +20,7 @@ import com.itextpdf.kernel.pdf.extgstate.PdfExtGState
 import com.itextpdf.kernel.pdf.xobject.PdfFormXObject
 import com.itextpdf.kernel.utils.PageRange
 import com.itextpdf.kernel.utils.PdfSplitter
+import com.itextpdf.kernel.utils.XmlProcessorCreator
 import java.io.File
 import java.io.FileNotFoundException
 import java.io.FileOutputStream
@@ -31,6 +33,11 @@ internal class PdfManipulatorImpl constructor(private val context: Context, orig
     override val workingCopy: File = fileUtil.createTempCopyIfNotExists(context, originalFileUri = originalFileUri)
     private val workingCopyUri: Uri = workingCopy.toUri()
 
+    init {
+        // Workaround to fix the error: java.lang.UnsupportedOperationException: This parser does not support specification "Unknown" version "0.0"
+        XmlProcessorCreator.setXmlParserFactory(BareXmlParserFactory())
+    }
+
     /**
      * Splits the pdf file at the given uri and creates a new document with the selected page indices and another one for the unselected indices.
      * If selected page indices are empty or contains all the pages, there will only be one document with all pages.

library/src/main/java/com/itextpdf/android/library/xmlparser/BareXmlParserFactory.kt

@@ -0,0 +1,36 @@
+package com.itextpdf.android.library.xmlparser
+
+import com.itextpdf.kernel.exceptions.PdfException
+import com.itextpdf.kernel.utils.IXmlParserFactory
+import org.xml.sax.SAXException
+import org.xml.sax.XMLReader
+import javax.xml.parsers.DocumentBuilder
+import javax.xml.parsers.DocumentBuilderFactory
+import javax.xml.parsers.ParserConfigurationException
+import javax.xml.parsers.SAXParserFactory
+
+
+class BareXmlParserFactory : IXmlParserFactory {
+    override fun createDocumentBuilderInstance(namespaceAware: Boolean, ignoringComments: Boolean): DocumentBuilder {
+        val factory = DocumentBuilderFactory.newInstance()
+        val db: DocumentBuilder = try {
+            factory.newDocumentBuilder()
+        } catch (e: ParserConfigurationException) {
+            throw PdfException(e.message, e)
+        }
+        return db
+    }
+
+    override fun createXMLReaderInstance(namespaceAware: Boolean, validating: Boolean): XMLReader {
+        val factory = SAXParserFactory.newInstance()
+        val xmlReader: XMLReader = try {
+            val saxParser = factory.newSAXParser()
+            saxParser.xmlReader
+        } catch (e: ParserConfigurationException) {
+            throw PdfException(e.message, e)
+        } catch (e: SAXException) {
+            throw PdfException(e.message, e)
+        }
+        return xmlReader
+    }
+}