1 files changed, 68 insertions, 0 deletions
diff --git a/src/main/javassist/compiler/ast/ASTree.java b/src/main/javassist/compiler/ast/ASTree.java
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+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (the "License"); you may not use this file except in
+ * compliance with the License.  You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba.  Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.compiler.ast;
+
+import java.io.Serializable;
+import javassist.compiler.CompileError;
+
+/**
+ * Abstract Syntax Tree.  An ASTree object represents a node of
+ * a binary tree.  If the node is a leaf node, both <code>getLeft()</code>
+ * and <code>getRight()</code> returns null.
+ */
+public abstract class ASTree implements Serializable {
+    public ASTree getLeft() { return null; }
+
+    public ASTree getRight() { return null; }
+
+    public void setLeft(ASTree _left) {}
+
+    public void setRight(ASTree _right) {}
+
+    /**
+     * Is a method for the visitor pattern.  It calls
+     * <code>atXXX()</code> on the given visitor, where
+     * <code>XXX</code> is the class name of the node object.
+     */
+    public abstract void accept(Visitor v) throws CompileError;
+
+    public String toString() {
+	StringBuffer sbuf = new StringBuffer();
+	sbuf.append('<');
+	sbuf.append(getTag());
+	sbuf.append('>');
+	return sbuf.toString();
+    }
+
+    /**
+     * Returns the type of this node.  This method is used by
+     * <code>toString()</code>.
+     */
+    protected String getTag() {
+	String name = getClass().getName();
+	return name.substring(name.lastIndexOf('.') + 1);
+    }
+}