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 */
017package org.apache.camel.language.simple.ast;
018
019import org.apache.camel.Exchange;
020import org.apache.camel.Expression;
021import org.apache.camel.language.simple.types.SimpleParserException;
022import org.apache.camel.language.simple.types.SimpleToken;
023
024/**
025 * Represents a null expression.
026 */
027public class NullExpression extends BaseSimpleNode {
028
029    public NullExpression(SimpleToken token) {
030        super(token);
031    }
032
033    @Override
034    public Expression createExpression(String expression) throws SimpleParserException {
035        return new Expression() {
036            @Override
037            public <T> T evaluate(Exchange exchange, Class<T> type) {
038                return null;
039            }
040
041            @Override
042            public String toString() {
043                return "null";
044            }
045        };
046    }
047}