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}