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    }