org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/ConvertAnonymousToNestedAction.java

/*******************************************************************************
 * 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.jdt.ui.actions;

import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.ISourceRange;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaModelException;

import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.help.WorkbenchHelp;

import org.eclipse.jdt.internal.corext.refactoring.code.ConvertAnonymousToNestedRefactoring;

import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
import org.eclipse.jdt.internal.ui.actions.ActionUtil;
import org.eclipse.jdt.internal.ui.actions.SelectionConverter;
import org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor;
import org.eclipse.jdt.internal.ui.javaeditor.JavaTextSelection;
import org.eclipse.jdt.internal.ui.refactoring.ConvertAnonymousToNestedWizard;
import org.eclipse.jdt.internal.ui.refactoring.RefactoringMessages;
import org.eclipse.jdt.internal.ui.refactoring.RefactoringWizard;
import org.eclipse.jdt.internal.ui.refactoring.actions.RefactoringActions;
import org.eclipse.jdt.internal.ui.refactoring.actions.RefactoringStarter;
import org.eclipse.jdt.internal.ui.util.ExceptionHandler;

/**
 * Action to convert an anonymous inner class to a nested class.
 * 
 * <p>
 * This class may be instantiated; it is not intended to be subclassed.
 * </p>
 * 
 * @since 2.1
 */
public class ConvertAnonymousToNestedAction extends SelectionDispatchAction {

	private static final String DIALOG_MESSAGE_TITLE= RefactoringMessages.getString("ConvertAnonymousToNestedAction.dialog_title"); //$NON-NLS-1$
	private final CompilationUnitEditor fEditor;
	
	/**
	 * Note: This constructor is for internal use only. Clients should not call this constructor.
	 */
	public ConvertAnonymousToNestedAction(CompilationUnitEditor editor) {
		super(editor.getEditorSite());
		setText(RefactoringMessages.getString("ConvertAnonymousToNestedAction.Convert_Anonymous")); //$NON-NLS-1$
		fEditor= editor;
		setEnabled(SelectionConverter.getInputAsCompilationUnit(fEditor) != null);
		WorkbenchHelp.setHelp(this, IJavaHelpContextIds.CONVERT_ANONYMOUS_TO_NESTED_ACTION);
	}

	public ConvertAnonymousToNestedAction(IWorkbenchSite site) {
		super(site);
		fEditor= null;
		setText(RefactoringMessages.getString("ConvertAnonymousToNestedAction.Convert_Anonymous")); //$NON-NLS-1$
		WorkbenchHelp.setHelp(this, IJavaHelpContextIds.CONVERT_ANONYMOUS_TO_NESTED_ACTION);
	}
	
	//---- Structured selection -----------------------------------------------------
	
	/* (non-Javadoc)
	 * Method declared on SelectionDispatchAction
	 */
	public void selectionChanged(IStructuredSelection selection) {
		setEnabled(getElement(selection) != null);
	}
	
	/* (non-Javadoc)
	 * Method declared on SelectionDispatchAction
	 */
	public void run(IStructuredSelection selection) {
		IType type= getElement(selection);
		if (type == null)
			return;
		ISourceRange range;
		try {
			range= type.getNameRange();
			run(type.getCompilationUnit(), range.getOffset(), range.getLength());
		} catch (JavaModelException e) {
			ExceptionHandler.handle(e, DIALOG_MESSAGE_TITLE, RefactoringMessages.getString("NewTextRefactoringAction.exception")); //$NON-NLS-1$
		}
	}

	private IType getElement(IStructuredSelection selection) {
		if (selection.size() != 1)
			return null;
		Object element= selection.getFirstElement();
		if (!(element instanceof IType))
			return null;
		IType type= (IType)element;
		try {
			if (type.isAnonymous())
				return type;
		} catch (JavaModelException e) {
			// fall through
		}
		return null;
	}
	
	//---- Text selection -----------------------------------------------------------
	
	/* (non-Javadoc)
	 * Method declared on SelectionDispatchAction
	 */		
	public void run(ITextSelection selection) {
		try{
			run(SelectionConverter.getInputAsCompilationUnit(fEditor), selection.getOffset(), selection.getLength());
		} catch (JavaModelException e){
			ExceptionHandler.handle(e, DIALOG_MESSAGE_TITLE, RefactoringMessages.getString("NewTextRefactoringAction.exception")); //$NON-NLS-1$
		}	
	}

	/* (non-Javadoc)
	 * Method declared on SelectionDispatchAction
	 */		
	public void selectionChanged(ITextSelection selection) {
		setEnabled(canEnable(selection));
	}
	
	private boolean canEnable(ITextSelection selection) {
		return fEditor != null && SelectionConverter.getInputAsCompilationUnit(fEditor) != null;
	}
	
	/**
	 * Note: This method is for internal use only. Clients should not call this method.
	 */
	public void selectionChanged(JavaTextSelection selection) {
		try {
			setEnabled(canEnable(selection));
		} catch (JavaModelException e) {
			setEnabled(false);
		}
	}
	
	private boolean canEnable(JavaTextSelection selection) throws JavaModelException {
		IType type= RefactoringActions.getEnclosingType(selection);
		if (type == null)
			return false;
		return ConvertAnonymousToNestedRefactoring.isAvailable(type);
	}
	
	//---- helpers -------------------------------------------------------------------
	
	private void run(ICompilationUnit unit, int offset, int length) throws JavaModelException {
		if (!ActionUtil.isProcessable(getShell(), unit))
			return;
		ConvertAnonymousToNestedRefactoring refactoring= createRefactoring(unit, offset, length);
		if (refactoring == null)
			return;
		new RefactoringStarter().activate(refactoring, createWizard(refactoring), getShell(), DIALOG_MESSAGE_TITLE, false);
	}
	
	private static ConvertAnonymousToNestedRefactoring createRefactoring(ICompilationUnit cunit, int offset, int length) {
		return ConvertAnonymousToNestedRefactoring.create(cunit, offset, length);
	}

	private static RefactoringWizard createWizard(ConvertAnonymousToNestedRefactoring refactoring) {
		return new ConvertAnonymousToNestedWizard(refactoring);
	}
}