ExtractedMethodDef.java

/***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Common 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/legal/cpl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2006 Lukas Felber <lfelber@hsr.ch>
 * Copyright (C) 2006 Mirko Stocker <me@misto.ch>
 * Copyright (C) 2006 Thomas Corbat <tcorbat@hsr.ch>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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package org.rubypeople.rdt.refactoring.core.extractmethod;

import org.jruby.ast.BlockNode;
import org.jruby.ast.MethodDefNode;
import org.jruby.ast.Node;
import org.rubypeople.rdt.refactoring.core.NodeProvider;
import org.rubypeople.rdt.refactoring.core.SelectionNodeProvider;
import org.rubypeople.rdt.refactoring.editprovider.InsertEditProvider;
import org.rubypeople.rdt.refactoring.offsetprovider.AfterNodeOffsetProvider;

public class ExtractedMethodDef extends InsertEditProvider {

	private ExtractedMethodHelper extractedMethodHelper;

	private Node insertAfterNode;

	public ExtractedMethodDef(ExtractMethodConfig config) {
		super(true);
		extractedMethodHelper = config.getHelper();
		insertAfterNode = initInsertAfterNode(config);
		if (insertAfterNode == null) {
			setInsertType(INSERT_AT_BEGIN_OF_LINE);
		}
	}

	private Node initInsertAfterNode(ExtractMethodConfig config) {
		Node enclosingMethodNode = SelectionNodeProvider.getEnclosingNode(config.getRootNode(), config.getSelection(), MethodDefNode.class);
		if (enclosingMethodNode != null) {
			return enclosingMethodNode;
		}
		Node enclosingBlockNode = SelectionNodeProvider.getEnclosingNode(config.getRootNode(), config.getSelection(), BlockNode.class);
		if (enclosingBlockNode != null) {
			Node firstSelectedNode = (Node) config.getSelectedNodes();
			if (!firstSelectedNode.childNodes().isEmpty()) {
				firstSelectedNode = (Node) firstSelectedNode.childNodes().toArray()[0];
			}
			return NodeProvider.getNodeBefore(enclosingBlockNode, firstSelectedNode);
		}
		return null;
	}

	@Override
	protected Node getInsertNode(int offset, String document) {
		boolean needsNewLineAtEndOfBlock = !isNextLineEmpty(offset, document);
		boolean needsNewLineAtBeginOfBlock = (insertAfterNode != null);
		return extractedMethodHelper.getMethodNode(needsNewLineAtBeginOfBlock, needsNewLineAtEndOfBlock);
	}

	@Override
	protected int getOffset(String document) {

		if (insertAfterNode == null) {
			return 0;
		}
		return new AfterNodeOffsetProvider(insertAfterNode, document).getOffset();
	}

}