--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifact-database/src/main/java/de/intevation/artifactdatabase/rest/CollectionResource.java	Wed Mar 02 15:10:34 2011 +0000
@@ -0,0 +1,203 @@
+/*
+ * 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.artifacts.ArtifactDatabase;
+import de.intevation.artifacts.ArtifactDatabaseException;
+import de.intevation.artifacts.CallMeta;
+
+import de.intevation.artifacts.common.ArtifactNamespaceContext;
+import de.intevation.artifacts.common.utils.XMLUtils;
+
+import java.io.IOException;
+
+import org.apache.log4j.Logger;
+
+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.Request;
+import org.restlet.Response;
+
+import org.w3c.dom.Document;
+
+
+/**
+ * @author <a href="mailto:ingo.weinzierl@intevation">Ingo Weinzierl</a>
+ */
+public class CollectionResource
+extends      BaseResource
+{
+    /** The logger that is used in this class.*/
+    private static Logger logger = Logger.getLogger(CollectionResource.class);
+
+    /** server URL where to reach the resource.*/
+    public static final String PATH = "/collection/{uuid}";
+
+    /**
+     * XPath to figure out the type of action (feed, advance) via the
+     * incoming POST request.
+     */
+    public static final String XPATH_ACTION = "/art:action/art:type/@name";
+
+    /**
+     * XPath to figure out the identifier of the artifact described in the
+     * action.
+     */
+    public static final String XPATH_ARTIFACT =
+        "/art:action/art:type/art:artifact/@uuid";
+
+    /** Error message if no action was given.*/
+    public static final String NO_ACTION_MSG = "no action given";
+
+    /** Error message if a unknown action was given.*/
+    public static final String NO_SUCH_ACTION_MSG = "no such action";
+
+    /** Action name for deleting a collection.*/
+    public static final String ACTION_DELETE = "delete";
+
+    /** Action name for retrieving the attributes of an artifact stored in the
+     * collection.*/
+    public static final String ACTION_GET_ATTRIBUTE = "getattribute";
+
+    /** Action name for setting the attribute for an artifact stored in the
+     * collection.*/
+    public static final String ACTION_SET_ATTRIBUTE = "setattribute";
+
+    /** Action name for adding a new artifact to the collection.*/
+    public static final String ACTION_ADD_ARTIFACT = "addartifact";
+
+    /** Action name for removing an artifact from the collection.*/
+    public static final String ACTION_REMOVE_ARTIFACT = "removeartifact";
+
+    /** Action name for listing the artifacts of the collection.*/
+    public static final String ACTION_LIST_ARTIFACTS = "listartifacts";
+
+
+    /**
+     * Method to figure out which POST action was triggered and perform this
+     * operation on the collection specified by 'identifier' and found in the
+     * artifact database 'db'.
+     *
+     * @param identifier The identifier of the collection.
+     * @param action The action to be performed.
+     * @param source The input document to further parameterize the operation.
+     * @param db The artifact database where to find the collection.
+     *
+     * @return The representation produced by the performed action.
+     */
+    protected Representation dispatch(
+        String           identifier,
+        String           action,
+        Document         source,
+        ArtifactDatabase db
+    ) {
+        Document out = null;
+
+        try {
+            CallMeta meta = getCallMeta();
+
+            if (action.equals(ACTION_DELETE)) {
+                logger.info("Delete collection '" + identifier + "'");
+                out = db.deleteCollection(identifier, getCallMeta());
+            }
+            else if (action.equals(ACTION_ADD_ARTIFACT)) {
+                String art = getArtifactIdentifier(source);
+
+                logger.info("Add artifact '" + art + "' to collection.");
+                out = db.addCollectionArtifact(identifier, art, meta);
+            }
+            else if (action.equals(ACTION_REMOVE_ARTIFACT)) {
+                String art = getArtifactIdentifier(source);
+
+                logger.info("Remove artifact '" + art + "' from collection.");
+                out = db.removeCollectionArtifact(identifier, art, meta);
+            }
+            else if (action.equals(ACTION_LIST_ARTIFACTS)) {
+                logger.info("List artifacts of collection '" + identifier +"'");
+                out = db.listCollectionArtifacts(identifier, meta);
+            }
+            else if (action.equals(ACTION_SET_ATTRIBUTE)) {
+                String art = getArtifactIdentifier(source);
+
+                logger.info("Set attribute for artifact '" + art + "'");
+                out = db.setCollectionAttribute(identifier, art, source, meta);
+            }
+            else if (action.equals(ACTION_GET_ATTRIBUTE)) {
+                String art = getArtifactIdentifier(source);
+
+                logger.info("Retrieve attribute of artifact '" + art + "'");
+                out = db.getCollectionAttribute(identifier, art, meta);
+            }
+            else {
+                throw new ArtifactDatabaseException(NO_SUCH_ACTION_MSG);
+            }
+        }
+        catch (ArtifactDatabaseException adbe) {
+            logger.warn(adbe.getLocalizedMessage(), adbe);
+
+            Response response = getResponse();
+            response.setStatus(
+                Status.CLIENT_ERROR_BAD_REQUEST, adbe.getMessage());
+            return new EmptyRepresentation();
+        }
+
+        return new DomRepresentation(MediaType.APPLICATION_XML, out);
+    }
+
+
+    @Override
+    protected Representation innerPost(Representation requestRepr) {
+        Document input = null;
+        try {
+            DomRepresentation in = new DomRepresentation(requestRepr);
+            in.setNamespaceAware(true);
+            input = in.getDocument();
+        }
+        catch (IOException ioe) {
+            logger.error(ioe.getLocalizedMessage(), ioe);
+
+            Response response = getResponse();
+            response.setStatus(Status.CLIENT_ERROR_BAD_REQUEST, ioe);
+            return new EmptyRepresentation();
+        }
+
+        String action = XMLUtils.xpathString(
+            input, XPATH_ACTION, ArtifactNamespaceContext.INSTANCE);
+
+        if (action == null || action.length() == 0) {
+            Response response = getResponse();
+            response.setStatus(
+                Status.CLIENT_ERROR_BAD_REQUEST, NO_ACTION_MSG);
+            return new EmptyRepresentation();
+        }
+
+        Request request = getRequest();
+
+        String identifier = (String) request.getAttributes().get("uuid");
+
+        ArtifactDatabase db = getArtifactDatabase();
+
+        return dispatch(identifier, action, input, db);
+    }
+
+
+    /**
+     * Retrieves the identifier of the artifact used in the action.
+     *
+     * @param source The incoming document that describes the operation.
+     *
+     * @return the uuid of the artifact described in the document.
+     */
+    protected String getArtifactIdentifier(Document source) {
+        return XMLUtils.xpathString(
+            source, XPATH_ARTIFACT, ArtifactNamespaceContext.INSTANCE);
+    }
+}