IndentListOperation.java

package nota.oxygen.common.list;


import java.util.ArrayList;
import java.util.List;

import nota.oxygen.common.BaseAuthorOperation;
import nota.oxygen.common.Utils;

import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import ro.sync.ecss.extensions.api.ArgumentDescriptor;
import ro.sync.ecss.extensions.api.ArgumentsMap;
import ro.sync.ecss.extensions.api.AuthorDocumentController;
import ro.sync.ecss.extensions.api.AuthorOperationException;
import ro.sync.ecss.extensions.api.access.AuthorEditorAccess;
import ro.sync.ecss.extensions.api.node.AuthorElement;
import ro.sync.ecss.extensions.api.node.AuthorNode;


/**
 * Indents the selected list items 
 * @author Ole Holst Andersen (oha@nota.nu)
 */
public class IndentListOperation extends BaseAuthorOperation {

	@Override
	protected void doOperation() throws AuthorOperationException {
		try {
			AuthorEditorAccess edtAccess = getAuthorAccess().getEditorAccess();
			AuthorDocumentController docCtrl = getAuthorAccess().getDocumentController();
			int selStart = getSelectionStart();
			int selEnd = getSelectionEnd();
			
			AuthorElement list = getNamedCommonParentElementOfSelection(listElement, null);
			if (list==null) {
				throw new AuthorOperationException("Current selection has no common parent "+listElement+" element");
			}
			List<AuthorNode> items = list.getContentNodes();
			int firstItemIndex = 0;
			for (int i=0; i<items.size(); i++) 
			{
				AuthorNode item = items.get(i);
				if (item.getType()!=AuthorNode.NODE_TYPE_ELEMENT) {
					throw new AuthorOperationException("List contains non-element child");
				}
				if (selStart<item.getEndOffset())
				{
					firstItemIndex = i;
					break;
				}
			}
			int lastItemIndex = firstItemIndex;
			while (lastItemIndex<items.size())
			{
				AuthorNode item = items.get(lastItemIndex);
				if (item.getType()!=AuthorNode.NODE_TYPE_ELEMENT) {
					throw new AuthorOperationException("List contains non-element child");
				}
				if (item.getEndOffset()+2>=selEnd) break;
				lastItemIndex++;
			}
//			String itemsMsg = "Items";
//			for (int i=0; i<items.size(); i++)
//			{
//				AuthorNode item = items.get(i);
//				itemsMsg += "\n"+i+" from "+item.getStartOffset()+" to "+item.getEndOffset();
//			}
//			showMessage("Indenting items "+firstItemIndex+" until "+lastItemIndex+"\n"+itemsMsg+"\nCurrent selection: "+selStart+"-"+selEnd);
			String xml = serialize(list);
			Element listElem = Utils.deserializeElement(xml);
			Element li = null;
			NodeList children = listElem.getChildNodes();
			List<Node> childrenToMove = new ArrayList<Node>();
			for (int i=0; i<children.getLength(); i++) {
				if (children.item(i).getLocalName().equals(itemElement)) {
					li = (Element)children.item(i);
				}
				if (firstItemIndex<=i && i<=lastItemIndex) childrenToMove.add(children.item(i));
			}
			if (li==null) throw new AuthorOperationException("No list item was selected to indent");
			Element nestedListElem = (Element)listElem.cloneNode(false);
			nestedListElem.removeAttribute("id");
			li = (Element)li.cloneNode(false);
			li.removeAttribute("id");
			li.appendChild(nestedListElem);
			listElem.insertBefore(li, listElem.getChildNodes().item(firstItemIndex));
			for (Node c : childrenToMove) {
				nestedListElem.appendChild(listElem.removeChild(c));
			}
			docCtrl.deleteNode(list);
			docCtrl.insertXMLFragment(Utils.serialize(listElem), edtAccess.getCaretOffset());
		}
		catch (Exception e)
		{
			if (e instanceof AuthorOperationException)
			{
				throw (AuthorOperationException)e;
			}
			else
			{
				throw new AuthorOperationException(
						"Unexpected "+e.getClass().getName()+" occured: "+e.getMessage(),
						e);
			}
		}
	}

	@Override
	protected void parseArguments(ArgumentsMap args)
			throws IllegalArgumentException {
		listElement = (String)args.getArgumentValue(ARG_LIST_ELEMENT);
		itemElement = (String)args.getArgumentValue(ARG_ITEM_ELEMENT);
	}
	
	private static String ARG_LIST_ELEMENT = "list element";
	private static String ARG_ITEM_ELEMENT = "item element";
	private String listElement;
	private String itemElement;

	@Override
	public ArgumentDescriptor[] getArguments() {
		return new ArgumentDescriptor[] {
				new ArgumentDescriptor(ARG_LIST_ELEMENT, ArgumentDescriptor.TYPE_STRING, "list element name"),
				new ArgumentDescriptor(ARG_ITEM_ELEMENT, ArgumentDescriptor.TYPE_STRING, "item element name")
		};
	}

	@Override
	public String getDescription() {
		// TODO Auto-generated method stub
		return "Indent list items";
	}

}