/*******************************************************************************
 * Copyright (c) 2008, 2012 IBM Corporation and others.
 * 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
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.wst.xml.ui.internal.editor;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.IAdapterFactory;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.ui.internal.editor.SelectionConvertor;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMAttr;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMNode;
import org.w3c.dom.NamedNodeMap;

/**
 * @author nitin
 * 
 */
public class DOMSelectionConvertorFactory implements IAdapterFactory {

	private static final Class[] ADAPTER_LIST = new Class[]{SelectionConvertor.class};

	private static class XMLSelectionConvertor extends SelectionConvertor {
		/* (non-Javadoc)
		 * @see org.eclipse.wst.sse.ui.internal.editor.SelectionConvertor#getElements(org.eclipse.wst.sse.core.internal.provisional.IStructuredModel, int, int)
		 */
		public Object[] getElements(IStructuredModel model, int start, int end) {
			Object[] localSelectedStructures = null;
			if (model != null) {
				IDOMNode region = (IDOMNode)model.getIndexedRegion(start);
				if (region != null) {
					if (end <= region.getEndOffset()) {
						// single selection
						localSelectedStructures = new Object[1];
						localSelectedStructures[0] = region;
					} else {
						List structures = new ArrayList(2);

						IDOMNode node = region;
						while(node != null) {
							structures.add(node);
							IDOMNode next = (IDOMNode)node.getNextSibling();
							if(next == null) {
								next = (IDOMNode)node.getParentNode();
							}
							if(next != null) {
								if(next.getEndOffset() > end) {
									break;
								}
							}
							node = next;
						}
						localSelectedStructures = structures.toArray();
					}
				}
			}
			if (localSelectedStructures == null) {
				localSelectedStructures = new Object[0];
			}

			Object[] objects = localSelectedStructures;
			// narrow single selected Elements into Attrs if possible
			if (objects.length == 1) {
				if (objects[0] instanceof IDOMNode) {
					IDOMNode node = (IDOMNode) objects[0];
					NamedNodeMap attributes = node.getAttributes();
					if (attributes != null) {
						for (int i = 0; i < attributes.getLength(); i++) {
							IDOMAttr attribute = (IDOMAttr) attributes.item(i);
							if (attribute.contains(start) && attribute.contains(end)) {
								objects[0] = attribute;
								break;
							}
						}
					}
				}
			}
			return objects;
		}
	}

	private static final Object selectionConvertor = new XMLSelectionConvertor();

	/**
	 * 
	 */
	public DOMSelectionConvertorFactory() {
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.core.runtime.IAdapterFactory#getAdapter(java.lang.Object,
	 * java.lang.Class)
	 */
	public Object getAdapter(Object adaptableObject, Class adapterType) {
		if (adaptableObject instanceof IDOMModel && SelectionConvertor.class.equals(adapterType))
			return selectionConvertor;
		return null;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.runtime.IAdapterFactory#getAdapterList()
	 */
	public Class[] getAdapterList() {
		return ADAPTER_LIST;
	}

}