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.component.bean;
018
019 import java.lang.annotation.Annotation;
020 import java.lang.reflect.Method;
021
022 import org.apache.camel.CamelContext;
023 import org.apache.camel.Expression;
024 import org.apache.camel.builder.xml.XPathBuilder;
025 import org.apache.camel.language.LanguageAnnotation;
026 import org.apache.camel.language.NamespacePrefix;
027 import org.apache.camel.language.XPath;
028 import org.apache.camel.util.ObjectHelper;
029
030 /**
031 * Factory for the XPath expression annotations.
032 *
033 * @version $Revision: 773787 $
034 */
035 public class XPathAnnotationExpressionFactory extends DefaultAnnotationExpressionFactory {
036
037 @Override
038 public Expression createExpression(CamelContext camelContext, Annotation annotation, LanguageAnnotation languageAnnotation, Class expressionReturnType) {
039 String xpath = getExpressionFromAnnotation(annotation);
040 XPathBuilder builder = XPathBuilder.xpath(xpath);
041 NamespacePrefix[] namespaces = getExpressionNameSpacePrefix(annotation);
042 if (namespaces != null) {
043 for (NamespacePrefix namespacePrefix : namespaces) {
044 builder = builder.namespace(namespacePrefix.prefix(), namespacePrefix.uri());
045 }
046
047 }
048 return builder;
049 }
050
051 protected NamespacePrefix[] getExpressionNameSpacePrefix(Annotation annotation) {
052 try {
053 Method method = annotation.getClass().getMethod("namespaces");
054 Object value = ObjectHelper.invokeMethod(method, annotation);
055 return (NamespacePrefix[])value;
056 } catch (NoSuchMethodException e) {
057 throw new IllegalArgumentException("Cannot determine the annotation: " + annotation + " as it does not have an namespaces() method");
058 }
059 }
060 }