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.constant;
018
019import org.apache.camel.Expression;
020import org.apache.camel.IsSingleton;
021import org.apache.camel.Predicate;
022import org.apache.camel.builder.ExpressionBuilder;
023import org.apache.camel.spi.Language;
024import org.apache.camel.util.ExpressionToPredicateAdapter;
025
026/**
027 * A language for constant expressions.
028 */
029public class ConstantLanguage implements Language, IsSingleton {
030
031    public static Expression constant(Object value) {        
032        return ExpressionBuilder.constantExpression(value);
033    }
034
035    public Predicate createPredicate(String expression) {
036        return ExpressionToPredicateAdapter.toPredicate(createExpression(expression));
037    }
038
039    public Expression createExpression(String expression) {
040        return ConstantLanguage.constant(expression);
041    }
042
043    public boolean isSingleton() {
044        return true;
045    }
046}