/*
* Copyright 2008 - 2009 Lars Heuer (heuer[at]semagia.com). All rights reserved.
*
* Licensed 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 com.semagia.atomico.server.impl.jaxrs;
import javax.ws.rs.GET;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response;
import com.semagia.atomico.MediaType;
import com.semagia.atomico.dm.IWritableRepresentation;
import com.semagia.atomico.server.dm.ICollectionInfo;
import com.semagia.atomico.server.dm.IFragmentInfo;
import com.semagia.atomico.server.storage.StorageException;
/**
* Represents a fragment.
*
* @author Lars Heuer (heuer[at]semagia.com) <a href="http://www.semagia.com/">Semagia</a>
*/
public final class FragmentResource extends AbstractBaseResource {
private final ICollectionInfo _collInfo;
private final IFragmentInfo _fragmentInfo;
private final long _lastModification;
FragmentResource(final Request req, final ICollectionInfo collInfo, final String fragment) throws StorageException {
super(req);
_collInfo = collInfo;
_fragmentInfo = getStorage().getFragmentInfo(collInfo.getId(), fragment);
ResponseUtils.ensureExists(_fragmentInfo);
_lastModification = _fragmentInfo.getUpdated();
}
/* (non-Javadoc)
* @see com.semagia.atomico.server.impl.jaxrs.AbstractBaseResource#lastModification()
*/
@Override
protected long lastModification() {
return _lastModification;
}
/**
* Returns the requested fragment.
*
* @param headers HTTP headers.
* @return The requested fragment or an reponse which indicates a failure (i.e. Not Found)
* @throws StorageException In case of an error.
*/
@GET
@Produces("*/*")
public Response getFragment(@Context HttpHeaders headers) throws StorageException {
final Response.ResponseBuilder builder = makeResponseBuilder();
final MediaType mediaType = com.semagia.atomico.server.utils.MediaTypeUtils.getPreferredMediaType(_fragmentInfo.getMediaTypes(),
MediaTypeUtils.toAtomicoMediaType(headers.getAcceptableMediaTypes()));
if (mediaType == null) {
return ResponseUtils.notAcceptable(_fragmentInfo.getMediaTypes());
}
// Add Vary header
builder.variants(MediaTypeUtils.asVariants(_fragmentInfo.getMediaTypes()));
builder.type(MediaTypeUtils.toJaxRSMediaType(mediaType));
return ResponseUtils.buildStreamingEntity(builder, getFragment(mediaType));
}
private IWritableRepresentation getFragment(final MediaType mediaType) throws StorageException {
return getStorage().getFragment(_collInfo.getCollectionId(),
_fragmentInfo.getFragmentId(), mediaType);
}
}