DebugThread.java

/*******************************************************************************
 * Copyright (c) 2004 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
 *     Bjorn Freeman-Benson - initial API and implementation
 *******************************************************************************/
package rhogenwizard.debugger.model;

import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IBreakpoint;
import org.eclipse.debug.core.model.IStackFrame;
import org.eclipse.debug.core.model.IThread;

/**
 * A PDA VM thread. A PDA VM is single threaded.
 */
public class DebugThread extends DebugElement implements IThread
{	
	/**
	 * Breakpoints this thread is suspended at or <code>null</code>
	 * if none.
	 */
	private IBreakpoint[] m_breakpoints;
	
	/**
	 * Whether this thread is stepping
	 */
	private boolean m_isStepping = false;
	
	/**
	 * Constructs a new thread for the given target
	 * 
	 * @param target VM
	 */
	public DebugThread(DebugTarget target)
	{
		super(target);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IThread#getStackFrames()
	 */
	public IStackFrame[] getStackFrames() throws DebugException 
	{
		if (isSuspended()) 
		{
			IStackFrame[] stacks = ((DebugTarget)getDebugTarget()).getStackFrames();
			
			if (stacks[0] instanceof DebugStackFrame)
			{
				DebugStackFrame frame = (DebugStackFrame)stacks[0];
				
				if (frame.getSourceName().equals(""))
					return new IStackFrame[0];
			}
		
			return stacks;
		} 
		else 
		{
			return new IStackFrame[0];
		}
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IThread#hasStackFrames()
	 */
	public boolean hasStackFrames() throws DebugException 
	{
		return isSuspended();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IThread#getPriority()
	 */
	public int getPriority() throws DebugException
	{
		return 0;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IThread#getTopStackFrame()
	 */
	public IStackFrame getTopStackFrame() throws DebugException 
	{
		IStackFrame[] frames = getStackFrames();
		if (frames.length > 0) {
			return frames[0];
		}
		
		return null;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IThread#getName()
	 */
	public String getName() throws DebugException 
	{
		return "Main Ruby Thread";
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IThread#getBreakpoints()
	 */
	public IBreakpoint[] getBreakpoints() 
	{
		if (m_breakpoints == null) 
		{
			return new IBreakpoint[0];
		}
		
		return m_breakpoints;
	}
	
	/**
	 * Sets the breakpoints this thread is suspended at, or <code>null</code>
	 * if none.
	 * 
	 * @param breakpoints the breakpoints this thread is suspended at, or <code>null</code>
	 * if none
	 */
	protected void setBreakpoints(IBreakpoint[] breakpoints) 
	{
		m_breakpoints = breakpoints;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.ISuspendResume#canResume()
	 */
	public boolean canResume() 
	{
		return isSuspended();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.ISuspendResume#canSuspend()
	 */
	public boolean canSuspend() 
	{
		return !isSuspended();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.ISuspendResume#isSuspended()
	 */
	public boolean isSuspended() 
	{
		return getDebugTarget().isSuspended();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.ISuspendResume#resume()
	 */
	public void resume() throws DebugException
	{
		getDebugTarget().resume();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.ISuspendResume#suspend()
	 */
	public void suspend() throws DebugException
	{
		getDebugTarget().suspend();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IStep#canStepInto()
	 */
	public boolean canStepInto() 
	{
		//return false;
		return isSuspended();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IStep#canStepOver()
	 */
	public boolean canStepOver() 
	{
		//return false;
		return isSuspended();		
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IStep#canStepReturn()
	 */
	public boolean canStepReturn() 
	{
		//return false;
		return isSuspended();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IStep#isStepping()
	 */
	public boolean isStepping() 
	{
		return m_isStepping;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IStep#stepInto()
	 */
	public void stepInto() throws DebugException 
	{
		((DebugTarget)getDebugTarget()).stepInto();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IStep#stepOver()
	 */
	public void stepOver() throws DebugException 
	{
		((DebugTarget)getDebugTarget()).stepOver();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.IStep#stepReturn()
	 */
	public void stepReturn() throws DebugException 
	{
		((DebugTarget)getDebugTarget()).stepReturn();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.ITerminate#canTerminate()
	 */
	public boolean canTerminate() 
	{
		return !isTerminated();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.ITerminate#isTerminated()
	 */
	public boolean isTerminated() 
	{
		return getDebugTarget().isTerminated();
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.debug.core.model.ITerminate#terminate()
	 */
	public void terminate() throws DebugException 
	{
		getDebugTarget().terminate();
	}
	
	/**
	 * Sets whether this thread is stepping
	 * 
	 * @param stepping whether stepping
	 */
	protected void setStepping(boolean stepping) 
	{
		m_isStepping = stepping;
	}
}