/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.eclipse.org/org/documents/epl-v10.php
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ide.eclipse.adt.refactorings.extractstring;
import com.android.ide.eclipse.common.AndroidConstants;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ltk.ui.refactoring.RefactoringWizard;
import org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.FileEditorInput;
/*
* Quick Reference Link:
* http://www.eclipse.org/articles/article.php?file=Article-Unleashing-the-Power-of-Refactoring/index.html
* and
* http://www.ibm.com/developerworks/opensource/library/os-ecjdt/
*/
/**
* Action executed when the "Extract String" menu item is invoked.
* <p/>
* The intent of the action is to start a refactoring that extracts a source string and
* replaces it by an Android string resource ID.
* <p/>
* Workflow:
* <ul>
* <li> The action is currently located in the Refactoring menu in the main menu.
* <li> TODO: extend the popup refactoring menu in a Java or Android XML file.
* <li> The action is only enabled if the selection is 1 character or more. That is at least part
* of the string must be selected, it's not enough to just move the insertion point. This is
* a limitation due to {@link #selectionChanged(IAction, ISelection)} not being called when
* the insertion point is merely moved. TODO: address this limitation.
* <ul> The action gets the current {@link ISelection}. It also knows the current
* {@link IWorkbenchWindow}. However for the refactoring we are also interested in having the
* actual resource file. By looking at the Active Window > Active Page > Active Editor we
* can get the {@link IEditorInput} and find the {@link ICompilationUnit} (aka Java file)
* that is being edited.
* <ul> TODO: change this to find the {@link IFile} being manipulated. The {@link ICompilationUnit}
* can be inferred using {@link JavaCore#createCompilationUnitFrom(IFile)}. This will allow
* us to be able to work with a selection from an Android XML file later.
* <li> The action creates a new {@link ExtractStringRefactoring} and make it run on in a new
* {@link ExtractStringWizard}.
* <ul>
*/
public class ExtractStringAction implements IWorkbenchWindowActionDelegate {
/** Keep track of the current workbench window. */
private IWorkbenchWindow mWindow;
private ITextSelection mSelection;
private IFile mFile;
/**
* Keep track of the current workbench window.
*/
public void init(IWorkbenchWindow window) {
mWindow = window;
}
public void dispose() {
// Nothing to do
}
/**
* Examine the selection to determine if the action should be enabled or not.
* <p/>
* Keep a link to the relevant selection structure (i.e. a part of the Java AST).
*/
public void selectionChanged(IAction action, ISelection selection) {
// Note, two kinds of selections are returned here:
// ITextSelection on a Java source window
// IStructuredSelection in the outline or navigator
// This simply deals with the refactoring based on a non-empty selection.
// At that point, just enable the action and later decide if it's valid when it actually
// runs since we don't have access to the AST yet.
mSelection = null;
mFile = null;
if (selection instanceof ITextSelection) {
mSelection = (ITextSelection) selection;
if (mSelection.getLength() > 0) {
mFile = getSelectedFile();
}
}
action.setEnabled(mSelection != null && mFile != null);
}
/**
* Create a new instance of our refactoring and a wizard to configure it.
*/
public void run(IAction action) {
if (mSelection != null && mFile != null) {
ExtractStringRefactoring ref = new ExtractStringRefactoring(mFile, mSelection);
RefactoringWizard wizard = new ExtractStringWizard(ref, mFile.getProject());
RefactoringWizardOpenOperation op = new RefactoringWizardOpenOperation(wizard);
try {
op.run(mWindow.getShell(), wizard.getDefaultPageTitle());
} catch (InterruptedException e) {
// Interrupted. Pass.
}
}
}
/**
* Returns the active {@link IFile} (hopefully matching our selection) or null.
* The file is only returned if it's a file from a project with an Android nature.
* <p/>
* At that point we do not try to analyze if the selection nor the file is suitable
* for the refactoring. This check is performed when the refactoring is invoked since
* it can then produce meaningful error messages as needed.
*/
private IFile getSelectedFile() {
IWorkbenchWindow wwin = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
if (wwin != null) {
IWorkbenchPage page = wwin.getActivePage();
if (page != null) {
IEditorPart editor = page.getActiveEditor();
if (editor != null) {
IEditorInput input = editor.getEditorInput();
if (input instanceof FileEditorInput) {
FileEditorInput fi = (FileEditorInput) input;
IFile file = fi.getFile();
if (file.exists()) {
IProject proj = file.getProject();
try {
if (proj != null && proj.hasNature(AndroidConstants.NATURE)) {
return file;
}
} catch (CoreException e) {
// ignore
}
}
}
}
}
}
return null;
}
}
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