| /** |
| * 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.component.bean; |
| |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.Method; |
| |
| import org.apache.camel.CamelContext; |
| import org.apache.camel.Expression; |
| import org.apache.camel.builder.xml.XPathBuilder; |
| import org.apache.camel.language.LanguageAnnotation; |
| import org.apache.camel.language.NamespacePrefix; |
| import org.apache.camel.util.ObjectHelper; |
| |
| /** |
| * Factory for the XPath expression annotations. |
| * |
| * @version |
| */ |
| public class XPathAnnotationExpressionFactory extends DefaultAnnotationExpressionFactory { |
| |
| @Override |
| public Expression createExpression(CamelContext camelContext, Annotation annotation, LanguageAnnotation languageAnnotation, Class<?> expressionReturnType) { |
| String xpath = getExpressionFromAnnotation(annotation); |
| |
| Class<?> resultType = getResultType(annotation); |
| if (resultType.equals(Object.class)) { |
| resultType = expressionReturnType; |
| } |
| |
| XPathBuilder builder = XPathBuilder.xpath(xpath, resultType); |
| NamespacePrefix[] namespaces = getExpressionNameSpacePrefix(annotation); |
| if (namespaces != null) { |
| for (NamespacePrefix namespacePrefix : namespaces) { |
| builder = builder.namespace(namespacePrefix.prefix(), namespacePrefix.uri()); |
| } |
| |
| } |
| return builder; |
| } |
| |
| protected Class<?> getResultType(Annotation annotation) { |
| try { |
| Method method = annotation.getClass().getMethod("resultType"); |
| Object value = ObjectHelper.invokeMethod(method, annotation); |
| return (Class<?>) value; |
| } catch (NoSuchMethodException e) { |
| throw new IllegalArgumentException("Cannot determine the annotation: " + annotation + " as it does not have an resultType() method", e); |
| } |
| } |
| |
| protected NamespacePrefix[] getExpressionNameSpacePrefix(Annotation annotation) { |
| try { |
| Method method = annotation.getClass().getMethod("namespaces"); |
| Object value = ObjectHelper.invokeMethod(method, annotation); |
| return (NamespacePrefix[]) value; |
| } catch (NoSuchMethodException e) { |
| throw new IllegalArgumentException("Cannot determine the annotation: " + annotation + " as it does not have an namespaces() method", e); |
| } |
| } |
| } |