コード例 #1
0
  /**
   * Removes <code>newChild</code> from its present parent (if it has a parent), sets the child's
   * parent to this node, and then adds the child to this node's child array at index <code>
   * childIndex</code>. <code>newChild</code> must not be null and must not be an ancestor of this
   * node.
   *
   * @param newChild the MutableTreeNode to insert under this node
   * @param childIndex the index in this node's child array where this node is to be inserted
   * @exception ArrayIndexOutOfBoundsException if <code>childIndex</code> is out of bounds
   * @exception IllegalArgumentException if <code>newChild</code> is null or is an ancestor of this
   *     node
   * @exception IllegalStateException if this node does not allow children
   * @see #isNodeDescendant
   */
  public void insert(MutableTreeNode newChild, int childIndex) {
    if (!allowsChildren) {
      throw new IllegalStateException("node does not allow children");
    } else if (newChild == null) {
      throw new IllegalArgumentException("new child is null");
    } else if (isNodeAncestor(newChild)) {
      throw new IllegalArgumentException("new child is an ancestor");
    }

    MutableTreeNode oldParent = (MutableTreeNode) newChild.getParent();

    if (oldParent != null) {
      oldParent.remove(newChild);
    }
    newChild.setParent(this);
    if (children == null) {
      children = new Vector();
    }
    children.insertElementAt(newChild, childIndex);
  }
コード例 #2
0
 /**
  * Removes the subtree rooted at this node from the tree, giving this node a null parent. Does
  * nothing if this node is the root of its tree.
  */
 public void removeFromParent() {
   MutableTreeNode parent = (MutableTreeNode) getParent();
   if (parent != null) {
     parent.remove(this);
   }
 }