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}