| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.camel.builder; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.Expression; |
| import org.apache.camel.Predicate; |
| import org.apache.camel.language.simple.SimpleLanguage; |
| import org.apache.camel.util.ObjectHelper; |
| |
| /** |
| * Creates an {@link org.apache.camel.language.Simple} language builder. |
| * <p/> |
| * This builder is available in the Java DSL from the {@link RouteBuilder} which means that using |
| * simple language for {@link Expression}s or {@link Predicate}s is very easy with the help of this builder. |
| * |
| * @version |
| */ |
| public class SimpleBuilder implements Predicate, Expression { |
| |
| private final String text; |
| private Class<?> resultType; |
| // cache the expression/predicate |
| private volatile Expression expression; |
| private volatile Predicate predicate; |
| |
| public SimpleBuilder(String text) { |
| this.text = text; |
| } |
| |
| public static SimpleBuilder simple(String text) { |
| return new SimpleBuilder(text); |
| } |
| |
| public static SimpleBuilder simple(String text, Class<?> resultType) { |
| SimpleBuilder answer = simple(text); |
| answer.setResultType(resultType); |
| return answer; |
| } |
| |
| public String getText() { |
| return text; |
| } |
| |
| public Class<?> getResultType() { |
| return resultType; |
| } |
| |
| public void setResultType(Class<?> resultType) { |
| this.resultType = resultType; |
| } |
| |
| public SimpleBuilder resultType(Class<?> resultType) { |
| setResultType(resultType); |
| return this; |
| } |
| |
| public boolean matches(Exchange exchange) { |
| if (predicate == null) { |
| predicate = createPredicate(exchange); |
| } |
| return predicate.matches(exchange); |
| } |
| |
| public <T> T evaluate(Exchange exchange, Class<T> type) { |
| if (expression == null) { |
| expression = createExpression(exchange); |
| } |
| return expression.evaluate(exchange, type); |
| } |
| |
| private Predicate createPredicate(Exchange exchange) { |
| SimpleLanguage simple = (SimpleLanguage) exchange.getContext().resolveLanguage("simple"); |
| if (resultType != null) { |
| simple.setResultType(resultType); |
| } |
| // resolve property placeholders |
| try { |
| String resolve = exchange.getContext().resolvePropertyPlaceholders(text); |
| return simple.createPredicate(resolve); |
| } catch (Exception e) { |
| throw ObjectHelper.wrapCamelExecutionException(exchange, e); |
| } |
| } |
| |
| private Expression createExpression(Exchange exchange) { |
| SimpleLanguage simple = (SimpleLanguage) exchange.getContext().resolveLanguage("simple"); |
| if (resultType != null) { |
| simple.setResultType(resultType); |
| } |
| // resolve property placeholders |
| try { |
| String resolve = exchange.getContext().resolvePropertyPlaceholders(text); |
| return simple.createExpression(resolve); |
| } catch (Exception e) { |
| throw ObjectHelper.wrapCamelExecutionException(exchange, e); |
| } |
| } |
| |
| public String toString() { |
| return "Simple: " + text; |
| } |
| } |