001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.jexl2.parser;
018
019 import org.apache.commons.jexl2.JexlInfo;
020
021 /**
022 * Base class for parser nodes - holds an 'image' of the token for later use.
023 *
024 * @since 2.0
025 */
026 public abstract class JexlNode extends SimpleNode implements JexlInfo {
027 /** A marker interface for literals.
028 * @param <T> the literal type
029 */
030 public interface Literal<T> {
031 T getLiteral();
032 }
033
034 /** token value. */
035 public String image;
036
037 public JexlNode(int id) {
038 super(id);
039 }
040
041 public JexlNode(Parser p, int id) {
042 super(p, id);
043 }
044
045 public JexlInfo getInfo() {
046 JexlNode node = this;
047 while (node != null) {
048 if (node.value instanceof JexlInfo) {
049 return (JexlInfo) node.value;
050 }
051 node = node.jjtGetParent();
052 }
053 return null;
054 }
055
056 /** {@inheritDoc} */
057 public String debugString() {
058 JexlInfo info = getInfo();
059 return info != null? info.debugString() : "";
060 }
061 }