CreateNewTopLevelInterface.java

/**
 * Copyright (c) 2008-2012 University of Illinois at Urbana-Champaign.
 * 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
 */

package edu.illinois.compositerefactorings.steps;

import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.BodyDeclaration;
import org.eclipse.jdt.core.dom.ITypeBinding;
import org.eclipse.jdt.core.dom.TypeDeclaration;
import org.eclipse.jdt.core.refactoring.descriptors.JavaRefactoringDescriptor;
import org.eclipse.jdt.internal.corext.refactoring.JavaRefactoringDescriptorUtil;
import org.eclipse.jdt.internal.corext.refactoring.structure.ExtractInterfaceProcessor;
import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.ui.text.java.IInvocationContext;
import org.eclipse.ltk.core.refactoring.RefactoringDescriptor;

import edu.illinois.compositerefactorings.messages.CompositeRefactoringsMessages;
import edu.illinois.compositerefactorings.refactorings.createnewtoplevelinterface.CreateNewTopLevelInterfaceDescriptor;

@SuppressWarnings("restriction")
public class CreateNewTopLevelInterface extends RefactoringBasedStep {

	public CreateNewTopLevelInterface(IInvocationContext context, ASTNode coveringNode, boolean problemsAtLocation) {
		super(context, coveringNode, problemsAtLocation);
	}

	@Override
	protected Collection<? extends TypeDeclaration> getInputs() {
		Collection<TypeDeclaration> inputs= new ArrayList<TypeDeclaration>();
		TypeDeclaration typeDeclaration= null;

		if (context.getCoveredNode() instanceof TypeDeclaration) {
			typeDeclaration= (TypeDeclaration)context.getCoveredNode();
		} else if (coveringNode instanceof TypeDeclaration) {
			typeDeclaration= (TypeDeclaration)coveringNode;
		} else if (!(coveringNode instanceof BodyDeclaration) && coveringNode.getParent() != null && coveringNode.getParent() instanceof TypeDeclaration) {
			typeDeclaration= (TypeDeclaration)coveringNode.getParent();
		}

		if (typeDeclaration != null) {
			inputs.add(typeDeclaration);
		}

		return inputs;
	}

	/**
	 * The computation of {@code flags} is based on
	 * {@link ExtractInterfaceProcessor#createChange(IProgressMonitor)}
	 */
	@Override
	protected Collection<RefactoringDescriptor> getDescriptors(Object input) throws CoreException {
		TypeDeclaration typeDeclaration= (TypeDeclaration)input;
		ITypeBinding typeBinding= typeDeclaration.resolveBinding();
		IType type= (IType)typeBinding.getJavaElement();
		Collection<RefactoringDescriptor> descriptors= new ArrayList<RefactoringDescriptor>();

		String description= MessageFormat.format(CompositeRefactoringsMessages.CreateNewTopLevelInterface_description, type.getElementName());
		Map<String, String> arguments= new HashMap<String, String>();
		arguments.put(JavaRefactoringDescriptorUtil.ATTRIBUTE_INPUT, JavaRefactoringDescriptorUtil.elementToHandle(getJavaProject().getElementName(), type));
		arguments.put(JavaRefactoringDescriptorUtil.ATTRIBUTE_NAME, "I" + type.getElementName());
		int flags= JavaRefactoringDescriptor.JAR_MIGRATION | JavaRefactoringDescriptor.JAR_REFACTORING | RefactoringDescriptor.STRUCTURAL_CHANGE | RefactoringDescriptor.MULTI_CHANGE;
		try {
			if (type.isLocal() || type.isAnonymous()) {
				flags|= JavaRefactoringDescriptor.JAR_SOURCE_ATTACHMENT;
			}
		} catch (JavaModelException exception) {
			JavaPlugin.log(exception);
		}
		CreateNewTopLevelInterfaceDescriptor descriptor= new CreateNewTopLevelInterfaceDescriptor(getJavaProject().getElementName(), description, null, arguments, flags);
		descriptors.add(descriptor);
		return descriptors;
	}

}