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The Commons Jexl library is an implementation of the JSTL Expression Language with extensions.
There is a newer version: 2.1.1
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.jexl2.parser;

/**
 * A class originally generated by JJTree:
 * /* JavaCCOptions:MULTI=true,NODE_USES_PARSER=true,VISITOR=true,TRACK_TOKENS=false,NODE_PREFIX=AST,NODE_EXTENDS=,NODE_FACTORY= *\/
 * Worksaround issue https://javacc.dev.java.net/issues/show_bug.cgi?id=227
 * As soon as this issue if fixed and the maven plugin uses the correct version of Javacc, this
 * class can go away.
 *
 * The technical goal is to ensure every reference made in the parser was to a JexlNode; unfortunately,
 * as in javacc 4.1, it still uses a SimpleNode reference in the generated ParserVisitor.
 * Besides, there is no need to keep the parser around in the node.
 *
 * The functional goal is to a allow a volatile value in the node
 * so it can serve as a last evaluation cache even in multi-threaded executions.
 */
public class SimpleNode implements Node {
  protected JexlNode parent;
  protected JexlNode[] children;
  protected int id;
  /** volatile value so it can be used as a last evaluation cache. */
  protected volatile Object value;

  public SimpleNode(int i) {
    id = i;
  }

  public SimpleNode(Parser p, int i) {
    this(i);
  }

  public void jjtOpen() {
  }

  public void jjtClose() {
  }

  public void jjtSetParent(Node n) {
      parent = (JexlNode) n;
  }
  
  public JexlNode jjtGetParent() {
      return parent;
  }

  public void jjtAddChild(Node n, int i) {
    if (children == null) {
      children = new JexlNode[i + 1];
    } else if (i >= children.length) {
      JexlNode c[] = new JexlNode[i + 1];
      System.arraycopy(children, 0, c, 0, children.length);
      children = c;
    }
    children[i] = (JexlNode) n;
  }

  public JexlNode jjtGetChild(int i) {
    return children[i];
  }

  public int jjtGetNumChildren() {
    return (children == null) ? 0 : children.length;
  }

  public void jjtSetValue(Object value) {
      this.value = value;
  }

  public Object jjtGetValue() {
      return value;
  }

  /** Accept the visitor. **/
  public Object jjtAccept(ParserVisitor visitor, Object data) {
    return visitor.visit(this, data);
  }

  /** Accept the visitor. **/
  public Object childrenAccept(ParserVisitor visitor, Object data) {
    if (children != null) {
      for (int i = 0; i < children.length; ++i) {
        children[i].jjtAccept(visitor, data);
      }
    }
    return data;
  }

  /* You can override these two methods in subclasses of SimpleNode to
     customize the way the JexlNode appears when the tree is dumped.  If
     your output uses more than one line you should override
     toString(String), otherwise overriding toString() is probably all
     you need to do. */

  @Override
  public String toString() { return ParserTreeConstants.jjtNodeName[id]; }
  public String toString(String prefix) { return prefix + toString(); }

  /* Override this method if you want to customize how the JexlNode dumps
     out its children. */

  public void dump(String prefix) {
    System.out.println(toString(prefix));
    if (children != null) {
      for (int i = 0; i < children.length; ++i) {
  SimpleNode n = children[i];
  if (n != null) {
    n.dump(prefix + " ");
  }
      }
    }
  }
}

/* JavaCC - OriginalChecksum=7dff880883d088a37c1e3197e4b455a0 (do not edit this line) */