org.eclipse.jdt.debug.ui/ui/org/eclipse/jdt/internal/debug/ui/actions/BreakpointToggleAction.java

package org.eclipse.jdt.internal.debug.ui.actions;

/**********************************************************************
Copyright (c) 2000, 2002 IBM Corp.  All rights reserved.
This file is 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
**********************************************************************/
 
import java.util.Iterator;

import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IMarkerDelta;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.IBreakpointManager;
import org.eclipse.debug.core.IBreakpointsListener;
import org.eclipse.debug.core.model.IBreakpoint;
import org.eclipse.jdt.debug.core.IJavaBreakpoint;
import org.eclipse.jdt.internal.debug.ui.ExceptionHandler;
import org.eclipse.jdt.internal.debug.ui.JDIDebugUIPlugin;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IPartListener;
import org.eclipse.ui.IWorkbenchPart;

public abstract class BreakpointToggleAction implements IObjectActionDelegate, IBreakpointsListener, IPartListener {
	
	private IStructuredSelection fSelection;
	private IAction fAction;
	private IWorkbenchPart fPart;

	/**
	 * @see IActionDelegate#run(IAction)
	 */
	public void run(IAction action) {
		IStructuredSelection selection= getStructuredSelection();
		Iterator enum= selection.iterator();
		while (enum.hasNext()) {
			try {
				IJavaBreakpoint breakpoint= (IJavaBreakpoint) enum.next();
				doAction(breakpoint);
			} catch (CoreException e) {
				String title= ActionMessages.getString("BreakpointAction.Breakpoint_configuration_1"); //$NON-NLS-1$
				String message= ActionMessages.getString("BreakpointAction.Exceptions_occurred_attempting_to_modify_breakpoint._2"); //$NON-NLS-1$
				ExceptionHandler.handle(e, title, message);
			}			
		}
	}

	/**
	 * @see IActionDelegate#selectionChanged(IAction, ISelection)
	 */
	public void selectionChanged(IAction action, ISelection selection) {
		setAction(action);
		if (selection.isEmpty()) {
			setStructuredSelection(null);
			return;
		}
		if (selection instanceof IStructuredSelection) {
			setStructuredSelection((IStructuredSelection)selection);
			boolean enabled= isEnabledFor(getStructuredSelection());
			action.setEnabled(enabled);
			if (enabled) {
				IBreakpoint breakpoint= (IBreakpoint)getStructuredSelection().getFirstElement();
				if (breakpoint instanceof IJavaBreakpoint) {
					try {
						action.setChecked(getToggleState((IJavaBreakpoint) breakpoint));
					} catch (CoreException e) {
						JDIDebugUIPlugin.log(e);
					}
				}
			}
		}
	}

	/**
	 * Toggle the state of this action
	 */
	public abstract void doAction(IJavaBreakpoint breakpoint) throws CoreException;
	
	/**
	 * Returns whether this action is currently toggled on
	 */
	protected abstract boolean getToggleState(IJavaBreakpoint breakpoint) throws CoreException;
	
	/**
	 * Get the current selection
	 */
	protected IStructuredSelection getStructuredSelection() {
		return fSelection;
	}
	
	protected void setStructuredSelection(IStructuredSelection selection) {
		fSelection= selection;
	}
	
	public abstract boolean isEnabledFor(IStructuredSelection selection);

	/**
	 * Get the breakpoint manager for the debug plugin
	 */
	protected IBreakpointManager getBreakpointManager() {
		return DebugPlugin.getDefault().getBreakpointManager();		
	}
	
	/**
	 * Get the breakpoint associated with the given marker
	 */
	protected IBreakpoint getBreakpoint(IMarker marker) {
		return getBreakpointManager().getBreakpoint(marker);
	}

	protected IAction getAction() {
		return fAction;
	}

	protected void setAction(IAction action) {
		fAction = action;
	}
	
	/**
	 * @see IBreakpointsListener#breakpointsAdded(IBreakpoint[])
	 */
	public void breakpointsAdded(IBreakpoint[] breakpoints) {
	}

	/**
	 * @see IBreakpointsListener#breakpointsChanged(IBreakpoint[], IMarkerDelta[])
	 */
	public void breakpointsChanged(IBreakpoint[] breakpoints, IMarkerDelta[] deltas) {
		if (getAction() != null) {
			IStructuredSelection selection= getStructuredSelection();
			if (selection != null) {
				IBreakpoint selectedBreakpoint= (IBreakpoint)selection.getFirstElement();
				for (int i = 0; i < breakpoints.length; i++) {
					IBreakpoint breakpoint = breakpoints[i];
					if (selectedBreakpoint.equals(breakpoint)) {
						selectionChanged(getAction(), selection);
						return;
					}
				}
			}			
		}
	}

	/**
	 * @see IBreakpointsListener#breakpointsRemoved(IBreakpoint[], IMarkerDelta[])
	 */
	public void breakpointsRemoved(IBreakpoint[] breakpoints, IMarkerDelta[] deltas) {
	}
	
	protected IWorkbenchPart getPart() {
		return fPart;
	}

	protected void setPart(IWorkbenchPart part) {
		fPart = part;
	}
	
	/**
	 * @see IPartListener#partActivated(IWorkbenchPart)
	 */
	public void partActivated(IWorkbenchPart part) {
	}

	/**
	 * @see IPartListener#partBroughtToTop(IWorkbenchPart)
	 */
	public void partBroughtToTop(IWorkbenchPart part) {
	}

	/**
	 * @see IPartListener#partClosed(IWorkbenchPart)
	 */
	public void partClosed(IWorkbenchPart part) {
		if (part == getPart()) {
			getBreakpointManager().removeBreakpointListener(this);
			part.getSite().getPage().removePartListener(this);
		}
	}

	/**
	 * @see IPartListener#partDeactivated(IWorkbenchPart)
	 */
	public void partDeactivated(IWorkbenchPart part) {
	}

	/**
	 * @see IPartListener#partOpened(IWorkbenchPart)
	 */
	public void partOpened(IWorkbenchPart part) {
	}
	
	/**
	 * @see IObjectActionDelegate#setActivePart(IAction, IWorkbenchPart)
	 */
	public void setActivePart(IAction action, IWorkbenchPart targetPart) {
		IWorkbenchPart oldPart= getPart();
		if (oldPart != null) {
			getPart().getSite().getPage().removePartListener(this);			
		}	
		
		getBreakpointManager().addBreakpointListener(this);
		setPart(targetPart);
		targetPart.getSite().getPage().addPartListener(this);	
	}
}