/*******************************************************************************
* Copyright (c) 2010 IBM Corporation and others. All rights reserved. This program and the
* accompanying materials are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html Contributors: IBM Corporation - initial API and
* implementation
*******************************************************************************/
package org.eclipse.wst.sse.ui.internal.handlers;
import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.text.TextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.handlers.HandlerUtil;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.wst.sse.core.internal.provisional.text.IStructuredDocument;
/**
* This class contains all of the shared functionality for comment handlers
*/
public abstract class AbstractCommentHandler extends AbstractHandler {
/**
* <p>
* Default constructor must exist because sub classes are created by java reflection
* </p>
*/
public AbstractCommentHandler() {
super();
}
/**
* <p>
* Gets the important information out of the event and passes it onto the internal method
* {@link #processAction}
* </p>
*
* @see org.eclipse.wst.xml.ui.internal.handlers.CommentHandler#execute(org.eclipse.core.commands.ExecutionEvent)
*/
public final Object execute(ExecutionEvent event) throws ExecutionException {
IEditorPart editor = HandlerUtil.getActiveEditor(event);
ITextEditor textEditor = null;
if (editor instanceof ITextEditor)
textEditor = (ITextEditor) editor;
else {
Object o = editor.getAdapter(ITextEditor.class);
if (o != null)
textEditor = (ITextEditor) o;
}
if (textEditor != null) {
IDocument document = textEditor.getDocumentProvider().getDocument(textEditor.getEditorInput());
if (document != null && document instanceof IStructuredDocument) {
// get current text selection
ITextSelection textSelection = getCurrentSelection(textEditor);
if (!textSelection.isEmpty()) {
//call the implementers code to deal with the event
processAction(textEditor, (IStructuredDocument) document, textSelection);
}
}
}
return null;
}
/**
* <p>
* This method is called by the public {@link #execute} method whenever the comment handler is
* invoked. This method should be used for the logic of handling the structured comment event.
* </p>
*
* @param textEditor the text editor the initiating event was caused in
* @param document the document the text editor is editing
* @param textSelection the user selection when the event was caused
*/
protected abstract void processAction(ITextEditor textEditor, IStructuredDocument document,
ITextSelection textSelection);
/**
* <p>
* Gets the current user selection in the given {@link ITextEditor}
* </p>
*
* @param textEditor get the user selection from here
* @return the current user selection in <code>textEdtior</code>
*/
private static ITextSelection getCurrentSelection(ITextEditor textEditor) {
ISelectionProvider provider = textEditor.getSelectionProvider();
if (provider != null) {
ISelection selection = provider.getSelection();
if (selection instanceof ITextSelection) {
return (ITextSelection) selection;
}
}
return TextSelection.emptySelection();
}
}