TestReWriteSanity.java

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   this work for additional information regarding copyright ownership.
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       http://www.apache.org/licenses/LICENSE-2.0

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package org.apache.poi.hslf;


import junit.framework.TestCase;
import java.io.*;
import java.util.*;
import org.apache.poi.hslf.record.*;
import org.apache.poi.poifs.filesystem.*;
import org.apache.poi.POIDataSamples;

/**
 * Tests that HSLFSlideShow writes the powerpoint bit of data back out
 *  in a sane manner - i.e. records end up in the right place
 *
 * @author Nick Burch (nick at torchbox dot com)
 */
public final class TestReWriteSanity extends TestCase {
	// HSLFSlideShow primed on the test data
	private HSLFSlideShow ss;
	// POIFS primed on the test data
	private POIFSFileSystem pfs;

    public TestReWriteSanity() throws Exception {
        POIDataSamples slTests = POIDataSamples.getSlideShowInstance();
		pfs = new POIFSFileSystem(slTests.openResourceAsStream("basic_test_ppt_file.ppt"));
		ss = new HSLFSlideShow(pfs);
    }

	public void testUserEditAtomsRight() throws Exception {
		// Write out to a byte array
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		ss.write(baos);

		// Build an input stream of it
		ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());

		// Create a new one from that
		HSLFSlideShow wss = new HSLFSlideShow(bais);

		// Find the location of the PersistPtrIncrementalBlocks and
		// UserEditAtoms
		Record[] r = wss.getRecords();
		Hashtable pp = new Hashtable();
		Hashtable ue = new Hashtable();
		ue.put(Integer.valueOf(0),Integer.valueOf(0)); // Will show 0 if first
		int pos = 0;
		int lastUEPos = -1;

		for(int i=0; i<r.length; i++) {
			if(r[i] instanceof PersistPtrHolder) {
				pp.put(Integer.valueOf(pos), r[i]);
			}
			if(r[i] instanceof UserEditAtom) {
				ue.put(Integer.valueOf(pos), r[i]);
				lastUEPos = pos;
			}

			ByteArrayOutputStream bc = new ByteArrayOutputStream();
			r[i].writeOut(bc);
			pos += bc.size();
		}

		// Check that the UserEditAtom's point to right stuff
		for(int i=0; i<r.length; i++) {
			if(r[i] instanceof UserEditAtom) {
				UserEditAtom uea = (UserEditAtom)r[i];
				int luPos = uea.getLastUserEditAtomOffset();
				int ppPos = uea.getPersistPointersOffset();

				assertTrue(pp.containsKey(Integer.valueOf(ppPos)));
				assertTrue(ue.containsKey(Integer.valueOf(luPos)));
			}
		}

		// Check that the CurrentUserAtom points to the right UserEditAtom
		CurrentUserAtom cua = wss.getCurrentUserAtom();
		int listedUEPos = (int)cua.getCurrentEditOffset();
		assertEquals(lastUEPos,listedUEPos);
	}
}