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 Predicate} as an {@link org.apache.camel.Expression} 025 */ 026public final class PredicateToExpressionAdapter implements Expression { 027 private final Predicate predicate; 028 029 public PredicateToExpressionAdapter(Predicate predicate) { 030 this.predicate = predicate; 031 } 032 033 @Override 034 public <T> T evaluate(Exchange exchange, Class<T> type) { 035 boolean matches = predicate.matches(exchange); 036 return exchange.getContext().getTypeConverter().convertTo(type, exchange, matches); 037 } 038 039 @Override 040 public String toString() { 041 return predicate.toString(); 042 } 043 044 /** 045 * Converts the given predicate into an {@link org.apache.camel.Expression} 046 */ 047 public static Expression toExpression(final Predicate predicate) { 048 return new PredicateToExpressionAdapter(predicate); 049 } 050 051}