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The Core Camel Java DSL based router

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/**
 * 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.camel.language.simple.ast;

import org.apache.camel.Exchange;
import org.apache.camel.Expression;
import org.apache.camel.language.simple.types.SimpleParserException;
import org.apache.camel.language.simple.types.SimpleToken;

/**
 * Represents a null expression.
 */
public class NullExpression extends BaseSimpleNode {

    public NullExpression(SimpleToken token) {
        super(token);
    }

    @Override
    public Expression createExpression(String expression) throws SimpleParserException {
        return new Expression() {
            @Override
            public  T evaluate(Exchange exchange, Class type) {
                return null;
            }

            @Override
            public String toString() {
                return "null";
            }
        };
    }
}