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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.provider.xmlbeans;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.net.HttpURLConnection;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.xml.stream.XMLStreamReader;
import org.apache.cxf.jaxrs.provider.AbstractConfigurableProvider;
import org.apache.xmlbeans.XmlObject;
/**
* Provider for XMLBeans data objects.
*/
@Produces({"application/xml", "application/*+xml", "text/xml" })
@Consumes({"application/xml", "application/*+xml", "text/xml" })
@Provider
public class XMLBeansElementProvider extends AbstractConfigurableProvider
implements MessageBodyReader, MessageBodyWriter {
/** {@inheritDoc} */
public XmlObject readFrom(Class type, Type genericType,
Annotation[] annotations, MediaType m,
MultivaluedMap headers, InputStream is)
throws IOException {
return parseXmlBean(type, is);
}
/** {@inheritDoc} */
public void writeTo(XmlObject t, Class cls, Type genericType, Annotation[] annotations,
MediaType m, MultivaluedMap headers, OutputStream entityStream)
throws IOException {
// May need to set some XMLOptions here
t.save(entityStream);
}
/** {@inheritDoc} */
public long getSize(XmlObject t, Class type, Type genericType, Annotation[] annotations,
MediaType mt) {
// return length not known
return -1;
}
/** {@inheritDoc} */
public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mt) {
return isXmlBean(type);
}
/** {@inheritDoc} */
public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mt) {
return isXmlBean(type);
}
/**
* Create an XMLBean object from an XML stream.
*
* @param type declared type of the target object
* @param reader stream reader for the XML stream
* @return an XMLBean data object, or none if unable to process
*/
protected XmlObject parseXmlBean(Class type, XMLStreamReader reader) {
XmlObject result = null;
// get XMLBeans inner class Factory
Class factory = getFactory(type);
try {
// find and invoke method parse(InputStream)
Method m = factory.getMethod("parse", reader.getClass());
Object[] args = {
reader
};
Object obj = m.invoke(type, args);
if (obj instanceof XmlObject) {
result = (XmlObject)obj;
}
} catch (NoSuchMethodException nsme) {
throw new WebApplicationException(HttpURLConnection.HTTP_INTERNAL_ERROR);
} catch (InvocationTargetException ite) {
throw new WebApplicationException(HttpURLConnection.HTTP_INTERNAL_ERROR);
} catch (IllegalAccessException iae) {
throw new WebApplicationException(HttpURLConnection.HTTP_INTERNAL_ERROR);
}
return result;
}
/**
* Create an XMLBean data object from an InputStream
*
* @param type declared type of the required object
* @param inStream
* @return an XMLBean object if successful, otherwise null
*/
protected XmlObject parseXmlBean(Class type, InputStream inStream) {
XmlObject result = null;
Reader r = new InputStreamReader(inStream);
// delegate to parseXmlBean(Class type, Reader reader)
result = parseXmlBean(type, r);
return result;
}
/**
* Create an XMLBean data object using a stream Reader
*
* @param type declared type of the desired XMLBean data object
* @param reader
* @return an instance of the required object, otherwise null
*/
protected XmlObject parseXmlBean(Class type, Reader reader) {
XmlObject result = null;
Class factory = getFactory(type);
try {
// get factory method parse(InputStream)
Method m = factory.getMethod("parse", Reader.class);
Object[] args = {reader};
Object obj = m.invoke(type, args);
if (obj instanceof XmlObject) {
result = (XmlObject)obj;
}
} catch (NoSuchMethodException nsme) {
// do nothing, just return null
} catch (InvocationTargetException ite) {
// do nothing, just return null
} catch (IllegalAccessException iae) {
// do nothing, just return null
}
return result;
}
/**
* Locate the XMLBean Factory inner class.
*
* @param type
* @return the Factory class if present, otherwise null.
*/
private Class getFactory(Class type) {
Class result = null;
Class[] interfaces = type.getInterfaces();
// look for XMLBeans inner class Factory
for (Class inter : interfaces) {
Class[] declared = inter.getDeclaredClasses();
for (Class c : declared) {
if (c.getSimpleName().equals("Factory")) {
result = c;
}
}
}
return result;
}
/**
* Check if a Class is a valid XMLBeans data object. The check procedure involves looking
* for the Interface XmlObject in the target type's declaration. Assumed to be sufficient
* to identify the type as an XMLBean. From the javadoc (2.3.0) for XmlObject: "Corresponds to the XML
* Schema xs:anyType, the base type for all XML Beans."
*
* @param type
* @return true if found to be an XMLBean object, otherwise false
*/
protected boolean isXmlBean(Class type) {
boolean result = false;
Class[] interfaces = {type};
if (!type.isInterface()) {
interfaces = type.getInterfaces();
}
for (Class i : interfaces) {
Class[] superInterfaces = i.getInterfaces();
for (Class superI : superInterfaces) {
if (superI.getName().equals("org.apache.xmlbeans.XmlObject")) {
result = true;
}
}
}
return result;
}
}