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.util; 018 019import org.apache.camel.Exchange; 020import org.apache.camel.Expression; 021import org.apache.camel.Predicate; 022 023/** 024 * To adapt {@link org.apache.camel.Expression} as a {@link Predicate} 025 */ 026public final class ExpressionToPredicateAdapter implements Predicate { 027 private final Expression expression; 028 029 public ExpressionToPredicateAdapter(Expression expression) { 030 this.expression = expression; 031 } 032 033 public boolean matches(Exchange exchange) { 034 if (expression instanceof Predicate) { 035 return ((Predicate) expression).matches(exchange); 036 } else { 037 Object value = expression.evaluate(exchange, Object.class); 038 return ObjectHelper.evaluateValuePredicate(value); 039 } 040 } 041 042 @Override 043 public String toString() { 044 return expression.toString(); 045 } 046 047 /** 048 * Converts the given expression into an {@link Predicate} 049 */ 050 public static Predicate toPredicate(final Expression expression) { 051 return new ExpressionToPredicateAdapter(expression); 052 } 053 054}