/**
* 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 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());
}
}
// Set the header name that we want the XPathBuilder to apply the XPath expression to
String headerName = getHeaderName(annotation);
if (ObjectHelper.isNotEmpty(headerName)) {
builder.setHeaderName(headerName);
}
return builder;
}
protected Class<?> getResultType(Annotation annotation) {
return (Class<?>) getAnnotationObjectValue(annotation, "resultType");
}
protected NamespacePrefix[] getExpressionNameSpacePrefix(Annotation annotation) {
return (NamespacePrefix[]) getAnnotationObjectValue(annotation, "namespaces");
}
/**
* Extracts the value of the header method in the Annotation. For backwards
* compatibility this method will return null if the annotation's method is
* not found.
*
* @return If the annotation has the method 'header' then the name of the
* header we want to apply the XPath expression to. Otherwise null
* will be returned
*/
protected String getHeaderName(Annotation annotation) {
String headerValue = null;
try {
headerValue = (String)getAnnotationObjectValue(annotation, "headerName");
} catch (Exception e) {
// Do Nothing
}
return headerValue;
}
}