modifyattredit.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.w3c.dom.Attr;

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

public class ModifyAttrEdit extends AbstractUndoableEdit 
{
    private static final long serialVersionUID = -2778264565816387345L;
    
    private TreePath path;
    private JDFTreeNode attrNode;
    private JDFTreeNode modifiedNode;
    private JDFTreeNode parentNode;
    private Attr attrib;
    private Attr modifiedAttrib;
    private JDFElement parElement;

    
    private JDFFrame parFrame;
    private int pos;
    private boolean success = true;
    
    public ModifyAttrEdit(final JDFFrame parentFrame, final TreePath treePath,
                               JDFTreeNode attrToModifyNode, Attr attrToModify, int attrPos,
                                       JDFTreeNode modifiedAttrNode, Attr modifiedAttribute) 
    {
        parFrame = parentFrame;
        path = treePath;
               
        attrNode = attrToModifyNode;
        attrib = attrToModify;
        
        pos = attrPos;
        
        parentNode = (JDFTreeNode) modifiedAttrNode.getParent();
        parElement = (JDFElement) ((Wrapper) parentNode.getUserObject()).getElement();
        
        modifiedNode = modifiedAttrNode;
        modifiedAttrib = modifiedAttribute;
        path = new TreePath(modifiedNode.getPath());
        parFrame.updateViews(path);
    }

    public void undo() throws CannotUndoException 
    {
        success = parFrame.deleteItem(path);
        parFrame.insertInto(parentNode, attrNode, pos);
        parElement.setAttributeNode(attrib);
        
        path = new TreePath(attrNode.getPath());
        parFrame.updateViews(path);
    }

    public void redo() throws CannotRedoException 
    {
        success = parFrame.deleteItem(path);
        parFrame.insertInto(parentNode, modifiedNode, pos);
        parElement.setAttributeNode(modifiedAttrib);
        
        path = new TreePath(modifiedNode.getPath());
        parFrame.updateViews(path);
    }

    public boolean canUndo() 
    {
         return success;
    }

    public boolean canRedo() 
    {
        return success;
    }

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

}