/**
* 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.language.XPath;
import org.apache.camel.util.ObjectHelper;
/**
* Factory for the XPath expression annotations.
*
* @version $Revision: 773787 $
*/
public class XPathAnnotationExpressionFactory extends DefaultAnnotationExpressionFactory {
@Override
public Expression createExpression(CamelContext camelContext, Annotation annotation, LanguageAnnotation languageAnnotation, Class expressionReturnType) {
String xpath = getExpressionFromAnnotation(annotation);
XPathBuilder builder = XPathBuilder.xpath(xpath);
NamespacePrefix[] namespaces = getExpressionNameSpacePrefix(annotation);
if (namespaces != null) {
for (NamespacePrefix namespacePrefix : namespaces) {
builder = builder.namespace(namespacePrefix.prefix(), namespacePrefix.uri());
}
}
return builder;
}
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");
}
}
}