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.model.language;
018
019import javax.xml.bind.annotation.XmlAccessType;
020import javax.xml.bind.annotation.XmlAccessorType;
021import javax.xml.bind.annotation.XmlRootElement;
022
023import org.apache.camel.spi.Metadata;
024
025/**
026 * To use a constant value in Camel expressions or predicates.
027 * <p/>
028 * <b>Important:</b>
029 * this is a fixed constant value that is only set once during starting up the
030 * route, do not use this if you want dynamic values during routing.
031 */
032@Metadata(firstVersion = "1.5.0", label = "language,core", title = "Constant")
033@XmlRootElement(name = "constant")
034@XmlAccessorType(XmlAccessType.FIELD)
035public class ConstantExpression extends ExpressionDefinition {
036
037    public ConstantExpression() {
038    }
039
040    public ConstantExpression(String expression) {
041        super(expression);
042    }
043
044    @Override
045    public String getLanguage() {
046        return "constant";
047    }
048}