org.eclipse.jdt.ui.tests.refactoring/test cases/org/eclipse/jdt/ui/tests/changes/TrackPositionTest.java

/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.ui.tests.changes;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.eclipse.text.edits.ReplaceEdit;
import org.eclipse.text.edits.TextEdit; 

import org.eclipse.core.runtime.NullProgressMonitor;

import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;

import org.eclipse.jdt.internal.corext.refactoring.base.ChangeContext;
import org.eclipse.jdt.internal.corext.refactoring.changes.TextBufferChange;
import org.eclipse.jdt.internal.corext.refactoring.changes.TextChangeCompatibility;
import org.eclipse.jdt.internal.corext.textmanipulation.TextBuffer;

import org.eclipse.jdt.internal.ui.refactoring.changes.AbortChangeExceptionHandler;

public class TrackPositionTest extends TestCase {

	private static final Class THIS= TrackPositionTest.class;
	private static final String NN= "N.N";
	
	private TextBuffer fBuffer;
	private TextBufferChange fChange;
	
	public TrackPositionTest(String name) {
		super(name);
	}
	
	public static Test suite() {
		return new TestSuite(THIS);
	}
	
	protected void setUp() throws Exception {
		fBuffer= TextBuffer.create("0123456789");
		fChange= new TextBufferChange(NN, fBuffer);
		fChange.setKeepExecutedTextEdits(true);
	}
	
	protected void tearDown() throws Exception {
		fChange= null;
	}

	public void test1() throws Exception {
		TextEdit edit= new ReplaceEdit(2, 2, "xyz");
		TextChangeCompatibility.addTextEdit(fChange, NN, edit);
		executeChange();
		assertEquals(fChange.getNewTextRange(edit), 2, 3);
	}
	
	public void test2() throws Exception {
		TextEdit edit= new ReplaceEdit(5, 3, "xy");
		TextChangeCompatibility.addTextEdit(fChange, NN, edit);
		IDocument preview= fChange.getPreviewDocument();
		assertEquals(fBuffer.getContent(), "0123456789");
		assertEquals(preview.get(), "01234xy89");
		assertEquals(fChange.getNewTextRange(edit), 5, 2);
	}
		
	private void executeChange() throws Exception {
		try {
			ChangeContext context= new ChangeContext(new AbortChangeExceptionHandler());
			fChange.aboutToPerform(context, new NullProgressMonitor());
			fChange.perform(context, new NullProgressMonitor());
		} finally {
			fChange.performed();
		}
	}
	
	private static void assertEquals(IRegion r, int offset, int length) {
		assertEquals("Offset", offset, r.getOffset());
		assertEquals("Length", length, r.getLength());	
	}	
}