/**
* 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.aegis;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import javax.ws.rs.BadRequestException;
import javax.ws.rs.Consumes;
import javax.ws.rs.InternalServerErrorException;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.Provider;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.apache.cxf.aegis.AegisContext;
import org.apache.cxf.aegis.AegisReader;
import org.apache.cxf.aegis.AegisWriter;
import org.apache.cxf.aegis.type.AegisType;
import org.apache.cxf.staxutils.StaxUtils;
@Provider
@Produces({"application/xml", "application/*+xml", "text/xml" })
@Consumes({"application/xml", "application/*+xml", "text/xml" })
public class AegisElementProvider<T> extends AbstractAegisProvider<T> {
public T readFrom(Class<T> type, Type genericType, Annotation[] annotations, MediaType m,
MultivaluedMap<String, String> headers, InputStream is)
throws IOException {
if (genericType == null) {
genericType = type;
}
if (type == null) {
type = messyCastToRawType(genericType);
}
AegisContext context = getAegisContext(type, genericType);
AegisType typeToRead = context.getTypeMapping().getType(genericType);
AegisReader<XMLStreamReader> aegisReader = context.createXMLStreamReader();
XMLStreamReader xmlStreamReader = null;
try {
xmlStreamReader = createStreamReader(typeToRead, is);
return type.cast(aegisReader.read(xmlStreamReader, typeToRead));
} catch (Exception e) {
throw new BadRequestException(e);
} finally {
try {
StaxUtils.close(xmlStreamReader);
} catch (XMLStreamException e) {
throw new BadRequestException(e);
}
}
}
/* No better solution found yet, since the alternative is to require callers to come up with the Class for
* (e.g.) List<foo>, which is pretty messy all by itself. */
@SuppressWarnings("unchecked")
private Class<T> messyCastToRawType(Type genericType) {
if (genericType instanceof Class) {
return (Class<T>)genericType;
} else if (genericType instanceof ParameterizedType) {
ParameterizedType pType = (ParameterizedType) genericType;
return (Class<T>)pType.getRawType();
} else {
return null;
}
}
protected XMLStreamReader createStreamReader(AegisType topType, InputStream is)
throws Exception {
return StaxUtils.createXMLStreamReader(is);
}
public void writeTo(T obj, Class<?> type, Type genericType, Annotation[] anns,
MediaType m, MultivaluedMap<String, Object> headers, OutputStream os)
throws IOException {
if (type == null) {
type = obj.getClass();
}
if (genericType == null) {
genericType = type;
}
AegisContext context = getAegisContext(type, genericType);
AegisType aegisType = context.getTypeMapping().getType(genericType);
AegisWriter<XMLStreamWriter> aegisWriter = context.createXMLStreamWriter();
try {
XMLStreamWriter xmlStreamWriter = createStreamWriter(aegisType.getSchemaType(), os);
// use type qname as element qname?
xmlStreamWriter.writeStartDocument();
aegisWriter.write(obj, aegisType.getSchemaType(), false, xmlStreamWriter, aegisType);
xmlStreamWriter.writeEndDocument();
xmlStreamWriter.close();
} catch (Exception e) {
throw new InternalServerErrorException(e);
}
}
protected XMLStreamWriter createStreamWriter(QName typeQName,
OutputStream os) throws Exception {
return StaxUtils.createXMLStreamWriter(os);
}
}