/*******************************************************************************
 * 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.ui.views.markers.internal;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IMarker;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.util.OpenStrategy;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.actions.SelectionProviderAction;

/**
 * Action to open an editor on the selected bookmarks.
 */
public class ActionOpenMarker extends SelectionProviderAction {
	
	private final String HOVER_IMAGE_PATH = "clcl16/gotoobj_tsk.gif"; //$NON-NLS-1$
	private final String IMAGE_PATH = "elcl16/gotoobj_tsk.gif"; //$NON-NLS-1$
	private final String DISABLED_IMAGE_PATH = "dlcl16/gotoobj_tsk.gif"; //$NON-NLS-1$
	
	protected IWorkbenchPart part;

	public ActionOpenMarker(IWorkbenchPart part, ISelectionProvider provider) {
		super(provider, Messages.getString("openAction.title")); //$NON-NLS-1$
		this.part = part;
		setHoverImageDescriptor(ImageFactory.getImageDescriptor(HOVER_IMAGE_PATH));
		setImageDescriptor(ImageFactory.getImageDescriptor(IMAGE_PATH));
		setDisabledImageDescriptor(ImageFactory.getImageDescriptor(DISABLED_IMAGE_PATH));
		setEnabled(false);
	}
	
	public void run() {
		IStructuredSelection selection = getStructuredSelection();
		if (selection == null || selection.size() != 1)
			return;
		
		Object obj = selection.getFirstElement();
		if (!(obj instanceof IMarker))
			return;
		
		IMarker marker = (IMarker) obj;
		//optimization: if the active editor has the same input as the selected marker then 
		//RevealMarkerAction would have been run and we only need to activate the editor
		IEditorPart editor = part.getSite().getPage().getActiveEditor();
		if (editor != null) {
		IEditorInput input = editor.getEditorInput();
			if (input instanceof IFileEditorInput) {
				IFile file = ((IFileEditorInput) input).getFile();
				if (marker.getResource().equals(file)) {
					part.getSite().getPage().activate(editor);
				}
			}
		}

		try {
			part.getSite().getPage().openEditor(marker, OpenStrategy.activateOnOpen());
		} catch (PartInitException e) {
			// Open an error style dialog for PartInitException by
			// including any extra information from the nested
			// CoreException if present.

			// Check for a nested CoreException
			CoreException nestedException = null;
			IStatus status = e.getStatus();
			if (status != null && status.getException() instanceof CoreException)
				nestedException = (CoreException)status.getException();
	
			if (nestedException != null) {
				// Open an error dialog and include the extra
				// status information from the nested CoreException
				ErrorDialog.openError(
					part.getSite().getShell(),
					Messages.getString("OpenMarker.errorTitle"), //$NON-NLS-1$
					e.getMessage(),
					nestedException.getStatus());
			} else {
				// Open a regular error dialog since there is no
				// extra information to display
				MessageDialog.openError(
					part.getSite().getShell(),
					Messages.getString("OpenMarker.errorTitle"), //$NON-NLS-1$
					e.getMessage());
			}
		}
	}
	
	public void selectionChanged(IStructuredSelection selection) {
		setEnabled(selection != null && selection.size() == 1);
	}
}