org.apache.cxf.jaxrs.lifecycle.PerRequestResourceProvider Maven / Gradle / Ivy
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* 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.cxf.jaxrs.lifecycle;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Type;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import org.apache.cxf.jaxrs.model.Parameter;
import org.apache.cxf.jaxrs.model.URITemplate;
import org.apache.cxf.jaxrs.utils.AnnotationUtils;
import org.apache.cxf.jaxrs.utils.JAXRSUtils;
import org.apache.cxf.jaxrs.utils.ResourceUtils;
import org.apache.cxf.message.Message;
public class PerRequestResourceProvider implements ResourceProvider {
private Constructor c;
public PerRequestResourceProvider(Class clazz) {
c = ResourceUtils.findResourceConstructor(clazz, true);
if (c == null) {
throw new RuntimeException("Resource class " + clazz
+ " has no valid constructor");
}
}
public boolean isSingleton() {
return false;
}
public Object getInstance(Message m) {
return createInstance(m);
}
public Object getInstance() {
if (c.getParameterTypes().length > 0) {
throw new RuntimeException("Resource class constructor has context parameters "
+ "but no request message is available");
}
return createInstance(null);
}
@SuppressWarnings("unchecked")
protected Object createInstance(Message m) {
Class[] params = c.getParameterTypes();
Annotation[][] anns = c.getParameterAnnotations();
Type[] genericTypes = c.getGenericParameterTypes();
MultivaluedMap templateValues =
(MultivaluedMap)m.get(URITemplate.TEMPLATE_PARAMETERS);
Object[] values = new Object[params.length];
for (int i = 0; i < params.length; i++) {
if (AnnotationUtils.isContextClass(params[i])) {
values[i] = JAXRSUtils.createContextValue(m, genericTypes[i], params[i]);
} else {
Parameter p = ResourceUtils.getParameter(i, anns[i]);
values[i] = JAXRSUtils.createHttpParameterValue(
p, params[i], genericTypes[i], m, templateValues, null);
}
}
try {
return params.length > 0 ? c.newInstance(values) : c.newInstance(new Object[]{});
} catch (InstantiationException ex) {
String msg = "Resource class " + c.getDeclaringClass().getName() + " can not be instantiated";
throw new WebApplicationException(Response.serverError().entity(msg).build());
} catch (IllegalAccessException ex) {
String msg = "Resource class " + c.getDeclaringClass().getName() + " can not be instantiated"
+ " due to IllegalAccessException";
throw new WebApplicationException(Response.serverError().entity(msg).build());
} catch (InvocationTargetException ex) {
String msg = "Resource class "
+ c.getDeclaringClass().getName() + " can not be instantiated"
+ " due to InvocationTargetException";
throw new WebApplicationException(Response.serverError().entity(msg).build());
}
}
}