testhssfeventfactory.java

介绍java核心技术的pio编程方法以及基本概念

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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 );
		}
	}

    /**
     * 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 {
         File f = new File(dirname + "/42844.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);

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

	private static class MockHSSFListener implements HSSFListener {
		private MockHSSFListener() {}
		private ArrayList records = new ArrayList();

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