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