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/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* 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.jsdt.ui.actions;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.PlatformUI;
import org.eclipse.wst.jsdt.core.Flags;
import org.eclipse.wst.jsdt.core.IFunction;
import org.eclipse.wst.jsdt.core.IJavaScriptElement;
import org.eclipse.wst.jsdt.core.IType;
import org.eclipse.wst.jsdt.core.JavaScriptModelException;
import org.eclipse.wst.jsdt.internal.corext.util.Messages;
import org.eclipse.wst.jsdt.internal.corext.util.MethodOverrideTester;
import org.eclipse.wst.jsdt.internal.corext.util.SuperTypeHierarchyCache;
import org.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
import org.eclipse.wst.jsdt.internal.ui.actions.ActionMessages;
import org.eclipse.wst.jsdt.internal.ui.actions.ActionUtil;
import org.eclipse.wst.jsdt.internal.ui.actions.SelectionConverter;
import org.eclipse.wst.jsdt.internal.ui.javaeditor.JavaEditor;
import org.eclipse.wst.jsdt.internal.ui.util.ExceptionHandler;
import org.eclipse.wst.jsdt.ui.JavaScriptUI;
/**
* The action opens a JavaScript editor on the selected method's super implementation.
* <p>
* The action is applicable to selections containing elements of type <code>
* IFunction</code>.
*
* <p>
* This class may be instantiated; it is not intended to be subclassed.
* </p>
*
*
* Provisional API: This class/interface is part of an interim API that is still under development and expected to
* change significantly before reaching stability. It is being made available at this early stage to solicit feedback
* from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
* (repeatedly) as the API evolves.
*/
public class OpenSuperImplementationAction extends SelectionDispatchAction {
private JavaEditor fEditor;
/**
* Creates a new <code>OpenSuperImplementationAction</code>. The action requires
* that the selection provided by the site's selection provider is of type <code>
* org.eclipse.jface.viewers.IStructuredSelection</code>.
*
* @param site the site providing context information for this action
*/
public OpenSuperImplementationAction(IWorkbenchSite site) {
super(site);
setText(ActionMessages.OpenSuperImplementationAction_label);
setDescription(ActionMessages.OpenSuperImplementationAction_description);
setToolTipText(ActionMessages.OpenSuperImplementationAction_tooltip);
PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.OPEN_SUPER_IMPLEMENTATION_ACTION);
}
/**
* Note: This constructor is for internal use only. Clients should not call this constructor.
* @param editor the JavaScript editor
*/
public OpenSuperImplementationAction(JavaEditor editor) {
this(editor.getEditorSite());
fEditor= editor;
setEnabled(SelectionConverter.canOperateOn(fEditor));
}
/* (non-Javadoc)
* Method declared on SelectionDispatchAction.
*/
public void selectionChanged(ITextSelection selection) {
}
/* (non-Javadoc)
* Method declared on SelectionDispatchAction.
*/
public void selectionChanged(IStructuredSelection selection) {
IFunction method= getMethod(selection);
setEnabled(method != null && checkMethod(method));
}
/* (non-Javadoc)
* Method declared on SelectionDispatchAction.
*/
public void run(ITextSelection selection) {
if (!ActionUtil.isProcessable(fEditor))
return;
IJavaScriptElement element= elementAtOffset();
if (element == null || !(element instanceof IFunction)) {
MessageDialog.openInformation(getShell(), getDialogTitle(), ActionMessages.OpenSuperImplementationAction_not_applicable);
return;
}
run((IFunction) element);
}
/* (non-Javadoc)
* Method declared on SelectionDispatchAction.
*/
public void run(IStructuredSelection selection) {
run(getMethod(selection));
}
/*
* No Javadoc since the method isn't meant to be public but is
* since the beginning
*/
public void run(IFunction method) {
if (method == null)
return;
if (!ActionUtil.isProcessable(getShell(), method))
return;
if (!checkMethod(method)) {
MessageDialog.openInformation(getShell(), getDialogTitle(),
Messages.format(ActionMessages.OpenSuperImplementationAction_no_super_implementation, method.getElementName()));
return;
}
try {
IFunction impl= findSuperImplementation(method);
if (impl != null) {
JavaScriptUI.openInEditor(impl, true, true);
}
} catch (CoreException e) {
ExceptionHandler.handle(e, getDialogTitle(), ActionMessages.OpenSuperImplementationAction_error_message);
}
}
private IFunction findSuperImplementation(IFunction method) throws JavaScriptModelException {
MethodOverrideTester tester= SuperTypeHierarchyCache.getMethodOverrideTester(method.getDeclaringType());
return tester.findOverriddenMethod(method, false);
}
private IFunction getMethod(IStructuredSelection selection) {
if (selection.size() != 1)
return null;
Object element= selection.getFirstElement();
if (element instanceof IFunction) {
return (IFunction) element;
}
return null;
}
private boolean checkMethod(IFunction method) {
try {
int flags= method.getFlags();
if (!Flags.isStatic(flags) && !Flags.isPrivate(flags)) {
IType declaringType= method.getDeclaringType();
if (declaringType==null)
return false;
if (SuperTypeHierarchyCache.hasInCache(declaringType)) {
if (findSuperImplementation(method) == null) {
return false;
}
}
return true;
}
} catch (JavaScriptModelException e) {
if (!e.isDoesNotExist()) {
JavaScriptPlugin.log(e);
}
}
return false;
}
private IJavaScriptElement elementAtOffset() {
try {
return SelectionConverter.getElementAtOffset(fEditor);
} catch(JavaScriptModelException e) {
}
return null;
}
private static String getDialogTitle() {
return ActionMessages.OpenSuperImplementationAction_error_title;
}
}
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