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 */ 017 package org.apache.camel.util; 018 019 import org.apache.camel.Exchange; 020 import org.apache.camel.Expression; 021 import org.apache.camel.Predicate; 022 023 public final class ExpressionToPredicateAdapter implements Predicate { 024 private final Expression expression; 025 026 public ExpressionToPredicateAdapter(Expression expression) { 027 this.expression = expression; 028 } 029 030 public boolean matches(Exchange exchange) { 031 if (expression instanceof Predicate) { 032 return ((Predicate) expression).matches(exchange); 033 } else { 034 Object value = expression.evaluate(exchange, Object.class); 035 return ObjectHelper.evaluateValuePredicate(value); 036 } 037 } 038 039 @Override 040 public String toString() { 041 return expression.toString(); 042 } 043 044 /** 045 * Converts the given expression into an {@link Predicate} 046 */ 047 public static Predicate toPredicate(final Expression expression) { 048 return new ExpressionToPredicateAdapter(expression); 049 } 050 051 }