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

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

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */
 
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.IBreakpointListener;
import org.eclipse.debug.core.IBreakpointManager;
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, IBreakpointListener, 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= getStructuredSelection().size() == 1 
				&& isEnabledFor(getStructuredSelection().getFirstElement());
			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(Object element);

	/**
	 * 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 IBreakpointListener#breakpointAdded(IBreakpoint)
	 */
	public void breakpointAdded(IBreakpoint breakpoint) {
	}

	/**
	 * @see IBreakpointListener#breakpointChanged(IBreakpoint, IMarkerDelta)
	 */
	public void breakpointChanged(IBreakpoint breakpoint, IMarkerDelta delta) {
		if (getAction() != null) {
			IStructuredSelection selection= getStructuredSelection();
			if (selection != null) {
				IBreakpoint selectedBreakpoint= (IBreakpoint)selection.getFirstElement();
				if (selectedBreakpoint.equals(breakpoint)) {
					selectionChanged(getAction(), selection);
				}
			}			
		}
	}

	/**
	 * @see IBreakpointListener#breakpointRemoved(IBreakpoint, IMarkerDelta)
	 */
	public void breakpointRemoved(IBreakpoint breakpoint, IMarkerDelta delta) {
	}
	
	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);	
	}
}