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* 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
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* KIND, either express or implied. See the License for the
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package org.apache.wink.common.internal.providers.entity.atom;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
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.ws.rs.ext.Providers;
import org.apache.wink.common.internal.runtime.RuntimeContextTLS;
import org.apache.wink.common.internal.utils.MediaTypeUtils;
import org.apache.wink.common.model.atom.AtomEntry;
import org.apache.wink.common.model.synd.SyndContent;
import org.apache.wink.common.model.synd.SyndEntry;
@Provider
@Consumes( {MediaType.APPLICATION_ATOM_XML, MediaType.APPLICATION_JSON, MediaTypeUtils.JAVASCRIPT})
@Produces( {MediaType.APPLICATION_ATOM_XML, MediaType.APPLICATION_JSON, MediaTypeUtils.JAVASCRIPT})
public class AtomEntrySyndEntryProvider implements MessageBodyReader<SyndEntry>,
MessageBodyWriter<SyndEntry> {
@Context
private Providers providers;
public boolean isReadable(Class<?> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return type == SyndEntry.class;
}
public SyndEntry readFrom(Class<SyndEntry> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap<String, String> httpHeaders,
InputStream entityStream) throws IOException, WebApplicationException {
MessageBodyReader<AtomEntry> reader =
providers.getMessageBodyReader(AtomEntry.class, genericType, annotations, mediaType);
AtomEntry entry =
reader.readFrom(AtomEntry.class,
genericType,
annotations,
mediaType,
httpHeaders,
entityStream);
/*
* The value in the AtomContent object is arbitrary, set by the server. We want to use the
* built-in AND client application supplied providers. Because these providers are collected
* on the thread local store, and the unmarshalling of the AtomContent value is done lazily
* (after the client-server context has expired), we need some way to hold onto the Providers
* long enough for the client app to be able to seamlessly get the value off the AtomContent
* object. Thus the need to set the *real* providers list on the AtomContent object, so it
* can use the list to pass to ModelUtils when it needs to retrieve and unmarshal the AtomContent
* value.
*
* We have to be careful to use the real Providers list instead of the one from the injected
* local providers field in this class. The injected object may be a "proxy" to the real
* providers, and could cause an infinite loop when ModelUtils.readValue calls back through
* the providers.
*/
SyndEntry returnVal = entry.toSynd(new SyndEntry());
SyndContent content = returnVal.getContent();
if (content != null) {
content.setProviders(RuntimeContextTLS.getRuntimeContext().getAttribute(Providers.class));
}
return returnVal;
}
public boolean isWriteable(Class<?> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
MessageBodyWriter<AtomEntry> writer =
providers.getMessageBodyWriter(AtomEntry.class, genericType, annotations, mediaType);
return ((type.isAssignableFrom(SyndEntry.class)) && (writer != null));
}
public void writeTo(SyndEntry t,
Class<?> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType,
MultivaluedMap<String, Object> httpHeaders,
OutputStream entityStream) throws IOException, WebApplicationException {
AtomEntry entry = new AtomEntry(t);
MessageBodyWriter<AtomEntry> writer =
providers.getMessageBodyWriter(AtomEntry.class, genericType, annotations, mediaType);
// already checked for non-null writer in isWriteable
writer.writeTo(entry,
AtomEntry.class,
genericType,
annotations,
mediaType,
httpHeaders,
entityStream);
}
public long getSize(SyndEntry t,
Class<?> type,
Type genericType,
Annotation[] annotations,
MediaType mediaType) {
return -1;
}
}