poi/poi-scratchpad/src/test/java/org/apache/poi/hslf/model/TestTextRunReWrite.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.hslf.model;


import junit.framework.TestCase;
import java.io.*;

import org.apache.poi.hslf.HSLFSlideShow;
import org.apache.poi.hslf.usermodel.RichTextRun;
import org.apache.poi.hslf.usermodel.SlideShow;
import org.apache.poi.poifs.filesystem.*;
import org.apache.poi.POIDataSamples;

/**
 * Tests that if we load something up, get a TextRun, set the text
 *  to be the same as it was before, and write it all back out again,
 *  that we don't break anything in the process.
 *
 * @author Nick Burch (nick at torchbox dot com)
 */
public final class TestTextRunReWrite extends TestCase {
	// HSLFSlideShow primed on the test data
	private HSLFSlideShow hss;
	// HSLFSlideShow primed on the test data
	private SlideShow ss;
	// POIFS primed on the test data
	private POIFSFileSystem pfs;

	/**
	 * Load up a test PPT file with rich data
	 */
    public void setUp() throws Exception {
        POIDataSamples slTests = POIDataSamples.getSlideShowInstance();
		String filename = "Single_Coloured_Page_With_Fonts_and_Alignments.ppt";
		pfs = new POIFSFileSystem(slTests.openResourceAsStream(filename));
		hss = new HSLFSlideShow(pfs);
		ss = new SlideShow(hss);
    }

    public void testWritesOutTheSameNonRich() throws Exception {
    	// Grab the first text run on the first sheet
    	TextRun tr1 = ss.getSlides()[0].getTextRuns()[0];
    	TextRun tr2 = ss.getSlides()[0].getTextRuns()[1];

    	// Ensure the text lengths are as we'd expect to start with
    	assertEquals(1, ss.getSlides().length);
    	assertEquals(2, ss.getSlides()[0].getTextRuns().length);
    	assertEquals(30, tr1.getText().length());
    	assertEquals(179, tr2.getText().length());

    	assertEquals(1, tr1.getRichTextRuns().length);
    	assertEquals(30, tr1.getRichTextRuns()[0].getLength());
    	assertEquals(30, tr1.getRichTextRuns()[0].getText().length());
    	assertEquals(31, tr1.getRichTextRuns()[0]._getRawCharacterStyle().getCharactersCovered());
    	assertEquals(31, tr1.getRichTextRuns()[0]._getRawParagraphStyle().getCharactersCovered());

    	// Set the text to be as it is now
    	tr1.setText( tr1.getText() );

    	// Check the text lengths are still right
    	assertEquals(30, tr1.getText().length());
    	assertEquals(179, tr2.getText().length());

    	assertEquals(1, tr1.getRichTextRuns().length);
    	assertEquals(30, tr1.getRichTextRuns()[0].getLength());
    	assertEquals(30, tr1.getRichTextRuns()[0].getText().length());
    	assertEquals(31, tr1.getRichTextRuns()[0]._getRawCharacterStyle().getCharactersCovered());
    	assertEquals(31, tr1.getRichTextRuns()[0]._getRawParagraphStyle().getCharactersCovered());


		// Write the slideshow out to a byte array
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		ss.write(baos);

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

		// Use POIFS to query that lot
		POIFSFileSystem npfs = new POIFSFileSystem(bais);

		// Check that the "PowerPoint Document" sections have the same size
		DocumentEntry oProps = (DocumentEntry)pfs.getRoot().getEntry("PowerPoint Document");
		DocumentEntry nProps = (DocumentEntry)npfs.getRoot().getEntry("PowerPoint Document");
		assertEquals(oProps.getSize(),nProps.getSize());

		// Check that they contain the same data
		byte[] _oData = new byte[oProps.getSize()];
		byte[] _nData = new byte[nProps.getSize()];
		pfs.createDocumentInputStream("PowerPoint Document").read(_oData);
		npfs.createDocumentInputStream("PowerPoint Document").read(_nData);
		for(int i=0; i<_oData.length; i++) {
//			System.out.println(i + "\t" + Integer.toHexString(i));
			assertEquals(_oData[i], _nData[i]);
		}
	}

    public void testWritesOutTheSameRich() throws Exception {
    	// Grab the first text run on the first sheet
    	TextRun tr1 = ss.getSlides()[0].getTextRuns()[0];

    	// Get the first rich text run
    	RichTextRun rtr1 = tr1.getRichTextRuns()[0];


    	// Check that the text sizes are as expected
    	assertEquals(1, tr1.getRichTextRuns().length);
    	assertEquals(30, tr1.getText().length());
    	assertEquals(30, tr1.getRichTextRuns()[0].getText().length());
    	assertEquals(30, rtr1.getLength());
    	assertEquals(30, rtr1.getText().length());
    	assertEquals(31, rtr1._getRawCharacterStyle().getCharactersCovered());
    	assertEquals(31, rtr1._getRawParagraphStyle().getCharactersCovered());

    	// Set the text to be as it is now
    	rtr1.setText( rtr1.getText() );
    	rtr1 = tr1.getRichTextRuns()[0];

    	// Check that the text sizes are still as expected
    	assertEquals(1, tr1.getRichTextRuns().length);
    	assertEquals(30, tr1.getText().length());
    	assertEquals(30, tr1.getRichTextRuns()[0].getText().length());
    	assertEquals(30, rtr1.getLength());
    	assertEquals(30, rtr1.getText().length());
    	assertEquals(31, rtr1._getRawCharacterStyle().getCharactersCovered());
    	assertEquals(31, rtr1._getRawParagraphStyle().getCharactersCovered());


		// Write the slideshow out to a byte array
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		ss.write(baos);

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

		// Use POIFS to query that lot
		POIFSFileSystem npfs = new POIFSFileSystem(bais);

		// Check that the "PowerPoint Document" sections have the same size
		DocumentEntry oProps = (DocumentEntry)pfs.getRoot().getEntry("PowerPoint Document");
		DocumentEntry nProps = (DocumentEntry)npfs.getRoot().getEntry("PowerPoint Document");
		assertEquals(oProps.getSize(),nProps.getSize());

		// Check that they contain the same data
		byte[] _oData = new byte[oProps.getSize()];
		byte[] _nData = new byte[nProps.getSize()];
		pfs.createDocumentInputStream("PowerPoint Document").read(_oData);
		npfs.createDocumentInputStream("PowerPoint Document").read(_nData);
		for(int i=0; i<_oData.length; i++) {
//			System.out.println(i + "\t" + Integer.toHexString(i) + "\t" + _oData[i]);
			assertEquals(_oData[i], _nData[i]);
		}
	}
}