@@ -54,9 +54,13 @@
package org.apache.tools.ant.gui.acs;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.*;
import javax.swing.event.TreeModelListener;
import javax.swing.event.TreeModelEvent;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.apache.tools.ant.gui.acs.ACSProjectElement;
import java.util.*;
/**
* Provides a tree model view of the Project class. XXX This
@@ -64,8 +68,153 @@ import org.apache.tools.ant.gui.acs.ACSProjectElement;
*
* @version $Revision$
* @author Simeon H.K. Fitch */
public class ElementTreeModel extends DefaultTreeModel {
public class ElementTreeModel implements TreeModel {
/** Root of the tree. */
private ACSProjectElement _root = null;
/** List of listeners. */
private List _listeners = new ArrayList();
public ElementTreeModel(ACSProjectElement root) {
super(root);
_root = root;
}
/**
* Returns the root of the tree. Returns null only if the tree has
* no nodes.
*
* @return the root of the tree
*/
public Object getRoot() {
return _root;
}
/**
* Gets the set of children that this tree model is interested in.
*
* @param parent Parent to extract children from.
*/
private List getChildren(Node parent) {
NodeList children = parent.getChildNodes();
int length = children.getLength();
List retval = new ArrayList(length);
for(int i = 0; i < length; i++) {
// XXX This is where we will eventually add dynamic filtering
// capabilities.
Node n = children.item(i);
if(n instanceof ACSTreeNodeElement) {
retval.add(n);
}
}
return retval;
}
/**
* Returns the child of <I>parent</I> at index <I>index</I> in the parent's
* child array. <I>parent</I> must be a node previously obtained from
* this data source. This should not return null if <i>index</i>
* is a valid index for <i>parent</i> (that is <i>index</i> >= 0 &&
* <i>index</i> < getChildCount(<i>parent</i>)).
*
* @param parent a node in the tree, obtained from this data source
* @return the child of <I>parent</I> at index <I>index</I>
*/
public Object getChild(Object parent, int index) {
if(parent instanceof Node) {
Node n = (Node) parent;
return getChildren(n).get(index);
}
else {
return null;
}
}
/**
* Returns the number of children of <I>parent</I>. Returns 0 if the node
* is a leaf or if it has no children. <I>parent</I> must be a node
* previously obtained from this data source.
*
* @param parent a node in the tree, obtained from this data source
* @return the number of children of the node <I>parent</I>
*/
public int getChildCount(Object parent) {
if(parent instanceof Node) {
Node n = (Node) parent;
return getChildren(n).size();
}
else {
return 0;
}
}
/**
* Returns true if <I>node</I> is a leaf. It is possible for this method
* to return false even if <I>node</I> has no children. A directory in a
* filesystem, for example, may contain no files; the node representing
* the directory is not a leaf, but it also has no children.
*
* @param node a node in the tree, obtained from this data source
* @return true if <I>node</I> is a leaf
*/
public boolean isLeaf(Object node) {
if(node instanceof Node) {
Node n = (Node) node;
return getChildren(n).size() == 0;
}
else {
return true;
}
}
/**
* Returns the index of child in parent.
*/
public int getIndexOfChild(Object parent, Object child) {
if(parent instanceof Node && child instanceof Node) {
Node n = (Node) parent;
List children = getChildren(n);
int count = children.size();
for(int i = 0; i < count; i++) {
if(children.get(i) == child) return i;
}
}
return -1;
}
/**
* Messaged when the user has altered the value for the item identified
* by <I>path</I> to <I>newValue</I>. If <I>newValue</I> signifies
* a truly new value the model should post a treeNodesChanged
* event.
*
* @param path path to the node that the user has altered.
* @param newValue the new value from the TreeCellEditor.
*/
public void valueForPathChanged(TreePath path, Object newValue) {
}
/**
* Adds a listener for the TreeModelEvent posted after the tree changes.
*
* @see #removeTreeModelListener
* @param l the listener to add
*/
public void addTreeModelListener(TreeModelListener l) {
_listeners.add(l);
}
/**
* Removes a listener previously added with <B>addTreeModelListener()</B>.
*
* @see #addTreeModelListener
* @param l the listener to remove
*/
public void removeTreeModelListener(TreeModelListener l) {
_listeners.remove(l);
}
}
metasim