Mercurial > dive4elements > framework
diff artifact-database/src/main/java/de/intevation/artifactdatabase/rest/BaseOutResource.java @ 143:7e20702a90ed
Implemented an abstract class for the output of artifacts and collections. Added a CollectionOutResource.
artifacts/trunk@1368 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 02 Mar 2011 16:02:47 +0000 |
parents | |
children | b2115f484edb |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/artifact-database/src/main/java/de/intevation/artifactdatabase/rest/BaseOutResource.java Wed Mar 02 16:02:47 2011 +0000 @@ -0,0 +1,139 @@ +/* + * Copyright (c) 2011 by Intevation GmbH + * + * This program is free software under the LGPL (>=v2.1) + * Read the file LGPL.txt coming with the software for details + * or visit http://www.gnu.org/licenses/ if it does not exist. + */ +package de.intevation.artifactdatabase.rest; + +import de.intevation.artifactdatabase.XMLUtils; + +import de.intevation.artifacts.ArtifactDatabase; +import de.intevation.artifacts.ArtifactDatabaseException; +import de.intevation.artifacts.ArtifactNamespaceContext; +import de.intevation.artifacts.CallMeta; + +import java.io.IOException; + +import org.apache.log4j.Logger; + +import org.restlet.Request; +import org.restlet.Response; + +import org.restlet.data.MediaType; +import org.restlet.data.Status; + +import org.restlet.ext.xml.DomRepresentation; + +import org.restlet.representation.EmptyRepresentation; +import org.restlet.representation.Representation; + +import org.restlet.resource.ResourceException; + +import org.w3c.dom.Document; + + +/** + * Base Resource to serve the out()-outputs of collections and artifacts. + * + * @author <a href="mailto:ingo.weinzierl@intevation">Ingo Weinzierl</a> + */ +public abstract class BaseOutResource +extends BaseResource +{ + /** The logger used in this class.*/ + private static Logger logger = Logger.getLogger(BaseOutResource.class); + + /** XPath to figure out the MIME type of the requested result.*/ + public static final String XPATH_MIME_TYPE = + "/art:action/art:out/art:mime-type/@value"; + + /** Default result MIME type: octet stream.*/ + public static final MediaType DEFAULT_MIME_TYPE = + MediaType.APPLICATION_OCTET_STREAM; + + + @Override + protected Representation innerPost(Representation requestRepr) + throws ResourceException + { + Document inputDocument = null; + + try { + DomRepresentation input = new DomRepresentation(requestRepr); + input.setNamespaceAware(true); + inputDocument = input.getDocument(); + } + catch (IOException ioe) { + logger.error(ioe.getMessage()); + Response response = getResponse(); + response.setStatus(Status.CLIENT_ERROR_BAD_REQUEST, ioe); + return new EmptyRepresentation(); + } + + ArtifactDatabase db = getArtifactDatabase(); + + Request request = getRequest(); + + String identifier = getIdentifier(); + + if (logger.isDebugEnabled()) { + logger.debug("looking for artifact id '" + identifier + "'"); + } + + String mimeTypeString = XMLUtils.xpathString( + inputDocument, + XPATH_MIME_TYPE, + ArtifactNamespaceContext.INSTANCE); + + MediaType mimeType = DEFAULT_MIME_TYPE; + + if (mimeTypeString != null && mimeTypeString.length() != 0) { + try { + mimeType = MediaType.valueOf(mimeTypeString); + } + catch (Exception e) { + logger.error(e.getLocalizedMessage()); + } + } + + try { + return new OutRepresentation( + mimeType, + doOut(identifier, inputDocument, db, getCallMeta())); + } + catch (ArtifactDatabaseException adbe) { + Response response = getResponse(); + response.setStatus( + Status.CLIENT_ERROR_NOT_FOUND, adbe.getMessage()); + return new EmptyRepresentation(); + } + } + + /** + * Returns the identifier of the artifact or collection. + * + * @return the identifier. + */ + protected abstract String getIdentifier(); + + /** + * This method is called to process the operation on artifacts or + * collections. + * + * @param identifier The identifier of the artifact or collection. + * @param input The input document of the request. + * @param db The artifact database. + * @param meta The CallMeta object. + * + * @return the result of the operation. + */ + protected abstract ArtifactDatabase.DeferredOutput doOut( + String identifier, + Document input, + ArtifactDatabase db, + CallMeta meta) + throws ArtifactDatabaseException; +} +// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :