deleteitemedit.java

java xml 应用开发

import javax.swing.tree.TreePath;
import javax.swing.undo.AbstractUndoableEdit;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.CannotUndoException;

import org.cip4.jdflib.core.JDFElement;
import org.cip4.jdflib.util.StringUtil;

/*
 * InsertElementAfterEdit.java
 * @author Elena Skobchenko
 */

public class DeleteItemEdit extends AbstractUndoableEdit 
{
    private static final long serialVersionUID = -2778264565816334345L;
    
    private TreePath path;
    private JDFTreeNode delNode;
    private JDFTreeNode parentNode;
    private JDFElement delElement;
    private String attributeName;
    private String attributeValue;
    private JDFElement parElement;
    private JDFFrame parFrame;
    private int pos;
    private boolean success = true;
    
    public DeleteItemEdit(final JDFFrame parentFrame, final TreePath treePath) 
    {
        parFrame = parentFrame;
        path = treePath;
        delNode = (JDFTreeNode) treePath.getLastPathComponent();
        if (!delNode.isElement())
        {
            attributeName = StringUtil.token(delNode.toString(), 0, "=");
            attributeValue = StringUtil.token(delNode.toString(), 1, "=");
            if (attributeValue.indexOf("\"") != -1)
            {
                attributeValue = attributeValue.substring(1,attributeValue.length()-1);
            }
        }
        else 
        {
            delElement = (JDFElement) ((Wrapper) delNode.getUserObject()).getElement();
        }
        parentNode = (JDFTreeNode) treePath.getParentPath().getLastPathComponent();
        parElement = (JDFElement) ((Wrapper) parentNode.getUserObject()).getElement();
        pos = parentNode.getIndex(delNode);
         
        success = parFrame.deleteItem(treePath);
        parFrame.updateViews(treePath.getParentPath());
    }

    public void undo() throws CannotUndoException 
    {
        if (!delNode.isElement())
        {
            parElement.setAttribute(attributeName, attributeValue);
        }
        else 
        {
            parElement.appendChild(delElement);
        }
        parFrame.insertInto(parentNode, delNode, pos);      
        
        if (delNode == null)
        {
            success = false;
        }
        parFrame.updateViews(path);
    }

    public void redo() throws CannotRedoException 
    {
        success = parFrame.deleteItem(path);
        parFrame.updateViews(path.getParentPath());
    }

    public boolean canUndo() 
    {
         return  success && delNode != null;
    }

    public boolean canRedo() 
    {
        return  success && delNode != null;
    }

    public String getPresentationName() 
    {
         return "Delete";
    }

}