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

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.hssf.eventusermodel;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import junit.framework.TestCase;

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.hssf.record.ContinueRecord;
import org.apache.poi.hssf.record.DVALRecord;
import org.apache.poi.hssf.record.DVRecord;
import org.apache.poi.hssf.record.EOFRecord;
import org.apache.poi.hssf.record.FeatHdrRecord;
import org.apache.poi.hssf.record.Record;
import org.apache.poi.hssf.record.SelectionRecord;
import org.apache.poi.hssf.record.WindowTwoRecord;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
/**
 * 
 */
public final class TestHSSFEventFactory extends TestCase {
	
	private static final InputStream openSample(String sampleFileName) {
		return HSSFTestDataSamples.openSampleFileStream(sampleFileName);
	}

	public void testWithMissingRecords() throws Exception {

		HSSFRequest req = new HSSFRequest();
		MockHSSFListener mockListen = new MockHSSFListener();
		req.addListenerForAllRecords(mockListen);
		
		POIFSFileSystem fs = new POIFSFileSystem(openSample("SimpleWithSkip.xls"));
		HSSFEventFactory factory = new HSSFEventFactory();
		factory.processWorkbookEvents(req, fs);

		Record[] recs = mockListen.getRecords();
		// Check we got the records
		assertTrue( recs.length > 100 );
		
		// Check that the last few records are as we expect
		// (Makes sure we don't accidently skip the end ones)
		int numRec = recs.length;
		assertEquals(WindowTwoRecord.class, recs[numRec-3].getClass());
		assertEquals(SelectionRecord.class, recs[numRec-2].getClass());
		assertEquals(EOFRecord.class,	   recs[numRec-1].getClass());
	}

	public void testWithCrazyContinueRecords() throws Exception {
		// Some files have crazy ordering of their continue records
		// Check that we don't break on them (bug #42844)
		
		HSSFRequest req = new HSSFRequest();
		MockHSSFListener mockListen = new MockHSSFListener();
		req.addListenerForAllRecords(mockListen);
		
		POIFSFileSystem fs = new POIFSFileSystem(openSample("ContinueRecordProblem.xls"));
		HSSFEventFactory factory = new HSSFEventFactory();
		factory.processWorkbookEvents(req, fs);

		Record[] recs = mockListen.getRecords();
		// Check we got the records
		assertTrue( recs.length > 100 );

		// And none of them are continue ones
		for(int i=0; i<recs.length; i++) {
			assertFalse( recs[i] instanceof ContinueRecord );
		}
		
		// Check that the last few records are as we expect
		// (Makes sure we don't accidently skip the end ones)
		int numRec = recs.length;
		assertEquals(DVALRecord.class,    recs[numRec-4].getClass());
		assertEquals(DVRecord.class,      recs[numRec-3].getClass());
		assertEquals(FeatHdrRecord.class, recs[numRec-2].getClass());
		assertEquals(EOFRecord.class,     recs[numRec-1].getClass());
	}

	/**
	 * Unknown records can be continued.
	 * Check that HSSFEventFactory doesn't break on them.
	 * (the test file was provided in a reopen of bug #42844)
	 */
	public void testUnknownContinueRecords() throws Exception {

		HSSFRequest req = new HSSFRequest();
		MockHSSFListener mockListen = new MockHSSFListener();
		req.addListenerForAllRecords(mockListen);

		POIFSFileSystem fs = new POIFSFileSystem(openSample("42844.xls"));
		HSSFEventFactory factory = new HSSFEventFactory();
		factory.processWorkbookEvents(req, fs);

		assertTrue("no errors while processing the file", true);
	}

	private static class MockHSSFListener implements HSSFListener {
		private final List<Record> records = new ArrayList<Record>();

		public MockHSSFListener() {}
		public Record[] getRecords() {
			Record[] result = new Record[records.size()];
			records.toArray(result);
			return result;
		}

		public void processRecord(Record record) {
			records.add(record);
		}
	}
}