corejava第9版

corejava第9版/v2ch06/treeModel/ObjectTreeModel.java

@@ -0,0 +1,94 @@
+package treeModel;
+
+import java.lang.reflect.*;
+import java.util.*;
+import javax.swing.event.*;
+import javax.swing.tree.*;
+
+/**
+ * This tree model describes the tree structure of a Java object. Children are the objects that are
+ * stored in instance variables.
+ */
+public class ObjectTreeModel implements TreeModel
+{
+   private Variable root;
+   private EventListenerList listenerList = new EventListenerList();
+
+   /**
+    * Constructs an empty tree.
+    */
+   public ObjectTreeModel()
+   {
+      root = null;
+   }
+
+   /**
+    * Sets the root to a given variable.
+    * @param v the variable that is being described by this tree
+    */
+   public void setRoot(Variable v)
+   {
+      Variable oldRoot = v;
+      root = v;
+      fireTreeStructureChanged(oldRoot);
+   }
+
+   public Object getRoot()
+   {
+      return root;
+   }
+
+   public int getChildCount(Object parent)
+   {
+      return ((Variable) parent).getFields().size();
+   }
+
+   public Object getChild(Object parent, int index)
+   {
+      ArrayList<Field> fields = ((Variable) parent).getFields();
+      Field f = (Field) fields.get(index);
+      Object parentValue = ((Variable) parent).getValue();
+      try
+      {
+         return new Variable(f.getType(), f.getName(), f.get(parentValue));
+      }
+      catch (IllegalAccessException e)
+      {
+         return null;
+      }
+   }
+
+   public int getIndexOfChild(Object parent, Object child)
+   {
+      int n = getChildCount(parent);
+      for (int i = 0; i < n; i++)
+         if (getChild(parent, i).equals(child)) return i;
+      return -1;
+   }
+
+   public boolean isLeaf(Object node)
+   {
+      return getChildCount(node) == 0;
+   }
+
+   public void valueForPathChanged(TreePath path, Object newValue)
+   {
+   }
+
+   public void addTreeModelListener(TreeModelListener l)
+   {
+      listenerList.add(TreeModelListener.class, l);
+   }
+
+   public void removeTreeModelListener(TreeModelListener l)
+   {
+      listenerList.remove(TreeModelListener.class, l);
+   }
+
+   protected void fireTreeStructureChanged(Object oldRoot)
+   {
+      TreeModelEvent event = new TreeModelEvent(this, new Object[] { oldRoot });
+      for (TreeModelListener l : listenerList.getListeners(TreeModelListener.class))
+         l.treeStructureChanged(event);
+   }
+}