GapContentTest.java

/*******************************************************************************
 * Copyright (c) 2004, 2008 John Krasnay and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     John Krasnay - initial API and implementation
 *******************************************************************************/
package test.net.sf.vex.dom;

import junit.framework.TestCase;
import net.sf.vex.dom.GapContent;
import net.sf.vex.dom.Position;

/**
 * Test the GapContent class
 */
public class GapContentTest extends TestCase {

    public void testGapContent() throws Exception {
	//
	//  a b  (gap) c d
	// | | |        | |
	// 0 1 2        3 4
	//

	GapContent content = new GapContent(2);
	assertEquals(0, content.getLength());
	content.insertString(0, "a");
	assertEquals(1, content.getLength());
	content.insertString(1, "d");
	assertEquals(2, content.getLength());
	content.insertString(1, "c");
	assertEquals(3, content.getLength());
	content.insertString(1, "b");
	assertEquals(4, content.getLength());

	Position pa = content.createPosition(0);
	Position pb = content.createPosition(1);
	Position pc = content.createPosition(2);
	Position pd = content.createPosition(3);
	Position pe = content.createPosition(4);

	try {
	    content.getString(-1, 1);
	    fail("expected exception");
	} catch (IllegalArgumentException ex) {
	}

	try {
	    content.getString(4, 1);
	    fail("expected exception");
	} catch (IllegalArgumentException ex) {
	}

	try {
	    content.getString(0, -1);
	    fail("expected exception");
	} catch (IllegalArgumentException ex) {
	}

	try {
	    content.getString(0, 5);
	    fail("expected exception");
	} catch (IllegalArgumentException ex) {
	}

	try {
	    content.createPosition(-1);
	    fail("expected exception");
	} catch (IllegalArgumentException ex) {
	}

	try {
	    content.createPosition(5);
	    fail("expected exception");
	} catch (IllegalArgumentException ex) {
	}

	assertEquals("a", content.getString(0, 1));
	assertEquals("b", content.getString(1, 1));
	assertEquals("c", content.getString(2, 1));
	assertEquals("d", content.getString(3, 1));

	assertEquals("ab", content.getString(0, 2));
	assertEquals("bc", content.getString(1, 2));
	assertEquals("cd", content.getString(2, 2));

	assertEquals("abc", content.getString(0, 3));
	assertEquals("bcd", content.getString(1, 3));

	assertEquals("abcd", content.getString(0, 4));

	//
	//  a b x   (gap)   y c d
	// | | | |           | | |
	// 0 1 2 3           4 5 6
	// 
	content.insertString(2, "y");
	assertEquals(5, content.getLength());
	content.insertString(2, "x");
	assertEquals(6, content.getLength());

	assertEquals(0, pa.getOffset());
	assertEquals(1, pb.getOffset());
	assertEquals(4, pc.getOffset());
	assertEquals(5, pd.getOffset());
	assertEquals(6, pe.getOffset());

	Position px = content.createPosition(2);
	Position py = content.createPosition(3);

	content.remove(2, 2);

	assertEquals(4, content.getLength());

	assertEquals(0, pa.getOffset());
	assertEquals(1, pb.getOffset());
	assertEquals(2, px.getOffset());
	assertEquals(2, py.getOffset());
	assertEquals(2, pc.getOffset());
	assertEquals(3, pd.getOffset());
	assertEquals(4, pe.getOffset());
	
	assertEquals("a", content.getString(0, 1));
	assertEquals("b", content.getString(1, 1));
	assertEquals("c", content.getString(2, 1));
	assertEquals("d", content.getString(3, 1));

	assertEquals("ab", content.getString(0, 2));
	assertEquals("bc", content.getString(1, 2));
	assertEquals("cd", content.getString(2, 2));

	assertEquals("abc", content.getString(0, 3));
	assertEquals("bcd", content.getString(1, 3));

	assertEquals("abcd", content.getString(0, 4));

    }
}