/*******************************************************************************
 * 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.debug.tests.core;

import org.eclipse.debug.core.model.ILineBreakpoint;
import org.eclipse.debug.core.model.IVariable;
import org.eclipse.jdt.debug.core.IJavaDebugTarget;
import org.eclipse.jdt.debug.core.IJavaObject;
import org.eclipse.jdt.debug.core.IJavaStackFrame;
import org.eclipse.jdt.debug.core.IJavaThread;
import org.eclipse.jdt.debug.core.IJavaVariable;
import org.eclipse.jdt.debug.tests.AbstractDebugTest;

public class InstanceVariableTests extends AbstractDebugTest {
	
	public InstanceVariableTests(String name) {
		super(name);
	}

	public void testGetField() throws Exception {
		String typeName = "InstanceVariablesTests";
		
		ILineBreakpoint bp = createLineBreakpoint(30, typeName);		
		
		IJavaThread thread= null;
		try {
			thread= launchToLineBreakpoint(typeName, bp);

			IJavaStackFrame frame = (IJavaStackFrame)thread.getTopStackFrame();
			IVariable ivt = frame.findVariable("ivt");
			assertNotNull("Could not find variable 'ivt'", ivt);
			
			// retrieve an instance var
			IJavaObject value = (IJavaObject)ivt.getValue();
			assertNotNull(value);
			IJavaVariable pubStr = value.getField("pubStr", false);
			assertNotNull(pubStr);
			assertEquals("value should be 'redefined public'", pubStr.getValue().getValueString(), "redefined public");
			
			// retrieve an instance var in superclass
			IJavaVariable privStr = value.getField("privStr", false);
			assertNotNull(privStr);
			assertEquals("value should be 'private'", privStr.getValue().getValueString(), "private");			
			
			// retrieve an instance var in super class with same name
			pubStr = value.getField("pubStr", true);
			assertNotNull(pubStr);
			assertEquals("value should be 'public'", pubStr.getValue().getValueString(), "public");			
		} finally {
			terminateAndRemove(thread);
			removeAllBreakpoints();
		}		
	}
	
	public void testEvaluationAssignments() throws Exception {
		String typeName = "InstanceVariablesTests";
		
		ILineBreakpoint bp = createLineBreakpoint(28, typeName);		
		
		IJavaThread thread= null;
		try {
			thread= launchToLineBreakpoint(typeName, bp);

			IJavaStackFrame frame = (IJavaStackFrame)thread.getTopStackFrame();
			IVariable pubStr = frame.findVariable("pubStr");
			assertNotNull("Could not find variable 'pubStr'", pubStr);
			assertEquals("'pubStr' value should be 'public'", "public", pubStr.getValue().getValueString());
			
			evaluate("pubStr = \"hello\";", frame);			
			// the value should have changed
			assertEquals("'pubStr' value should be 'hello'", "hello", pubStr.getValue().getValueString());
			
			evaluate("pubStr = null;", frame);
			// the value should have changed
			assertEquals("'pubStr' value should be 'null'", ((IJavaDebugTarget)frame.getDebugTarget()).nullValue(), pubStr.getValue());
		} finally {
			terminateAndRemove(thread);
			removeAllBreakpoints();
		}		
	}
	
	public void testValueHasChanged() throws Exception {
		String typeName = "VariableChanges";
		
		ILineBreakpoint bp = createLineBreakpoint(21, typeName);		
		
		IJavaThread thread= null;
		try {
			thread= launchToLineBreakpoint(typeName, bp);

			IJavaStackFrame frame = (IJavaStackFrame)thread.getTopStackFrame();
			IVariable count = frame.findVariable("count");
			IVariable i = frame.findVariable("i");
			
			assertNotNull("could not find variable 'count'", count);
			assertNotNull("could not find variable 'i'", i);
			
			// on first suspend, change should be false
			count.getValue();
			i.getValue();
			assertFalse("count should not have changed", count.hasValueChanged());
			assertFalse("i should not have changed", i.hasValueChanged());
			
			// after a step over "count++" it should have changed
			stepOver(frame);
			
			// count should have changed, and i should not
			count.getValue();
			i.getValue();			
			assertTrue("count should have changed value", count.hasValueChanged());
			assertFalse("i should still be the same", i.hasValueChanged());
			
			stepOver(frame);
			
			// now count should be the same, and i should have changed
			count.getValue();
			i.getValue();
			assertFalse("count should not have changed", count.hasValueChanged());
			assertTrue("i should have changd", i.hasValueChanged());

		} finally {
			terminateAndRemove(thread);
			removeAllBreakpoints();
		}				
	}
}