Fix for bug #42844 - Include some of the crazy continue record handling that we have in RecordFactory into HSSFEventFactory, so that we can handle when records aren't immediately followed by their continue

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@569101 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/eventusermodel/HSSFEventFactory.java

@@ -27,6 +27,10 @@ import org.apache.poi.hssf.record.Record;
 import org.apache.poi.hssf.record.RecordInputStream;
 import org.apache.poi.hssf.record.RecordFactory;
 import org.apache.poi.hssf.record.ContinueRecord;
+import org.apache.poi.hssf.record.DrawingRecord;
+import org.apache.poi.hssf.record.DrawingGroupRecord;
+import org.apache.poi.hssf.record.ObjRecord;
+import org.apache.poi.hssf.record.TextObjectRecord;
 import org.apache.poi.poifs.filesystem.POIFSFileSystem;
 
 /**
@@ -140,11 +144,12 @@ public class HSSFEventFactory
 		{
                   
 			Record rec       = null;
+			Record lastRec   = null;
+			DrawingRecord lastDrawingRecord = new DrawingRecord();
 
 			while (in.hasNextRecord())
 			{
-                          in.nextRecord();
-
+				in.nextRecord();
 				sid = in.getSid();;
                 
                 //
@@ -190,9 +195,34 @@ public class HSSFEventFactory
 					// if there is only one
 					// records, it will go here too.
 				}
-				else
-					{
-                                  throw new RecordFormatException("Records should handle ContinueRecord internally. Should not see this exception");
+				else {
+					// Normally, ContinueRecords are handled internally
+					// However, in a few cases, there is a gap between a record at
+					//  its Continue, so we have to handle them specially
+					// This logic is much like in RecordFactory.createRecords()
+					Record[] recs = RecordFactory.createRecord(in);
+					ContinueRecord crec = (ContinueRecord)recs[0];
+					if((lastRec instanceof ObjRecord) || (lastRec instanceof TextObjectRecord)) {
+						// You can have Obj records between a DrawingRecord
+						//  and its continue!
+						lastDrawingRecord.processContinueRecord( crec.getData() );
+						// Trigger them on the drawing record, now it's complete
+						rec = lastDrawingRecord;
+					}
+					else if((lastRec instanceof DrawingGroupRecord)) {
+						((DrawingGroupRecord)lastRec).processContinueRecord(crec.getData());
+						// Trigger them on the drawing record, now it's complete
+						rec = lastRec;
+					}
+					else {
+						throw new RecordFormatException("Records should handle ContinueRecord internally. Should not see this exception");
+					}
+				}
+
+				// Update our tracking of the last record
+				lastRec = rec;
+				if(rec instanceof DrawingRecord) {
+					lastDrawingRecord = (DrawingRecord)rec;
 				}
 			}
 			if (rec != null)

src/testcases/org/apache/poi/hssf/eventusermodel/TestHSSFEventFactory.java

@@ -0,0 +1,88 @@
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
+package org.apache.poi.hssf.eventusermodel;
+import org.apache.poi.hssf.eventusermodel.HSSFEventFactory;
+import org.apache.poi.hssf.eventusermodel.HSSFListener;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.util.ArrayList;
+
+import org.apache.poi.hssf.record.Record;
+import org.apache.poi.hssf.record.ContinueRecord;
+import org.apache.poi.poifs.filesystem.POIFSFileSystem;
+
+import junit.framework.TestCase;
+
+public class TestHSSFEventFactory extends TestCase {
+	private String dirname;
+	
+	public TestHSSFEventFactory() {
+		dirname = System.getProperty("HSSF.testdata.path");
+	}
+
+	public void testWithMissingRecords() throws Exception {
+		File f = new File(dirname + "/SimpleWithSkip.xls");
+
+		HSSFRequest req = new HSSFRequest();
+		MockHSSFListener mockListen = new MockHSSFListener();
+		req.addListenerForAllRecords(mockListen);
+		
+		POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(f));
+		HSSFEventFactory factory = new HSSFEventFactory();
+		factory.processWorkbookEvents(req, fs);
+
+		// Check we got the records
+		assertTrue( mockListen.records.size() > 100 );
+	}
+
+	public void testWithCrazyContinueRecords() throws Exception {
+		// Some files have crazy ordering of their continue records
+		// Check that we don't break on them (bug #42844)
+
+		File f = new File(dirname + "/ContinueRecordProblem.xls");
+		
+		HSSFRequest req = new HSSFRequest();
+		MockHSSFListener mockListen = new MockHSSFListener();
+		req.addListenerForAllRecords(mockListen);
+		
+		POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(f));
+		HSSFEventFactory factory = new HSSFEventFactory();
+		factory.processWorkbookEvents(req, fs);
+
+		// Check we got the records
+		assertTrue( mockListen.records.size() > 100 );
+
+		// And none of them are continue ones
+		Record[] r = (Record[])mockListen.records.toArray( 
+							new Record[mockListen.records.size()] );
+		for(int i=0; i<r.length; i++) {
+			assertFalse( r[i] instanceof ContinueRecord );
+		}
+	}
+
+
+	private static class MockHSSFListener implements HSSFListener {
+		private MockHSSFListener() {}
+		private ArrayList records = new ArrayList();
+
+		public void processRecord(Record record) {
+			records.add(record);
+		}
+	}
+}