ingo@147: package de.intevation.flys.collections;
ingo@147: 
ingo@300: import java.io.IOException;
ingo@300: import java.io.OutputStream;
ingo@300: import java.util.ArrayList;
ingo@147: import java.util.Date;
ingo@300: import java.util.List;
ingo@300: import java.util.Map;
ingo@147: 
ingo@147: import javax.xml.xpath.XPathConstants;
ingo@147: 
ingo@147: import org.apache.log4j.Logger;
ingo@147: 
ingo@147: import org.w3c.dom.Document;
ingo@147: import org.w3c.dom.Element;
ingo@147: import org.w3c.dom.Node;
ingo@293: import org.w3c.dom.NodeList;
ingo@147: 
ingo@300: import de.intevation.artifacts.Artifact;
ingo@293: import de.intevation.artifacts.ArtifactDatabase;
ingo@293: import de.intevation.artifacts.ArtifactDatabaseException;
ingo@147: import de.intevation.artifacts.ArtifactNamespaceContext;
ingo@147: import de.intevation.artifacts.CallContext;
ingo@293: import de.intevation.artifacts.CallMeta;
ingo@147: 
ingo@147: import de.intevation.artifacts.common.utils.XMLUtils;
ingo@147: 
ingo@300: import de.intevation.artifactdatabase.Backend;
ingo@300: import de.intevation.artifactdatabase.Backend.PersistentArtifact;
ingo@147: import de.intevation.artifactdatabase.DefaultArtifactCollection;
ingo@147: 
ingo@300: import de.intevation.flys.artifacts.context.FLYSContext;
ingo@300: import de.intevation.flys.exports.OutGenerator;
ingo@300: 
ingo@147: 
ingo@147: /**
ingo@147:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@147:  */
ingo@147: public class FLYSArtifactCollection extends DefaultArtifactCollection {
ingo@147: 
ingo@147:     /** The logger used in this class.*/
ingo@147:     private static Logger log = Logger.getLogger(FLYSArtifactCollection.class);
ingo@147: 
ingo@147: 
ingo@147:     /** Constant XPath that points to the outputmodes of an artifact.*/
ingo@147:     public static final String XPATH_ARTIFACT_OUTPUTMODES =
ingo@147:         "/art:result/art:outputmodes";
ingo@147: 
ingo@293:     public static final String XPATH_COLLECTION_ITEMS =
ingo@293:         "/art:result/art:artifact-collection/art:collection-item";
ingo@293: 
ingo@300:     public static final String XPATH_OUT_NAME = "/art:action/@art:name";
ingo@300: 
ingo@300:     public static final String XPATH_OUT_TYPE = "/art:action/@art:type";
ingo@300: 
ingo@300: 
ingo@147: 
ingo@147:     @Override
ingo@147:     public Document describe(CallContext context) {
ingo@147:         log.debug("FLYSArtifactCollection.describe: " + identifier);
ingo@147: 
ingo@147:         Document doc = XMLUtils.newDocument();
ingo@147: 
ingo@147:         XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
ingo@147:             doc,
ingo@147:             ArtifactNamespaceContext.NAMESPACE_URI,
ingo@147:             ArtifactNamespaceContext.NAMESPACE_PREFIX);
ingo@147: 
ingo@147:         Date creationTime = getCreationTime();
ingo@147:         String creation   = creationTime != null
ingo@147:             ? Long.toString(creationTime.getTime())
ingo@147:             : "";
ingo@147: 
ingo@147:         Element collection = ec.create("artifact-collection");
ingo@147:         Element artifacts  = ec.create("artifacts");
ingo@147: 
ingo@147:         ec.addAttr(collection, "name", getName(), true);
ingo@147:         ec.addAttr(collection, "uuid", identifier(), true);
ingo@147:         ec.addAttr(collection, "creation", creation,  true);
ingo@147: 
ingo@147:         collection.appendChild(artifacts);
ingo@147:         doc.appendChild(collection);
ingo@147: 
ingo@147:         Document attribute = getAttribute();
ingo@147:         if (attribute != null) {
ingo@147:             Node child = attribute.getFirstChild();
ingo@147:             collection.appendChild(doc.importNode(child, true));
ingo@147:         }
ingo@147: 
ingo@300:         ArtifactDatabase db    = context.getDatabase();
ingo@293: 
ingo@300:         try {
ingo@300:             String[] artifactUUIDs = getArtifactUUIDs(context);
ingo@293: 
ingo@300:             for (String uuid: artifactUUIDs) {
ingo@293:                 try {
ingo@293:                     artifacts.appendChild(
ingo@293:                         buildArtifactNode(db, uuid, context, ec));
ingo@293:                 }
ingo@293:                 catch (ArtifactDatabaseException dbe) {
ingo@293:                     log.warn(dbe, dbe);
ingo@293:                 }
ingo@293:             }
ingo@293:         }
ingo@293:         catch (ArtifactDatabaseException ade) {
ingo@293:             log.error(ade, ade);
ingo@147:         }
ingo@147: 
ingo@147:         return doc;
ingo@147:     }
ingo@147: 
ingo@147: 
ingo@300:     @Override
ingo@300:     public void out(Document format, OutputStream out, CallContext context)
ingo@300:     throws IOException
ingo@300:     {
ingo@300:         log.info("FLYSArtifactCollection.out");
ingo@300: 
ingo@300:         String name = XMLUtils.xpathString(
ingo@300:             format, XPATH_OUT_NAME, ArtifactNamespaceContext.INSTANCE);
ingo@300: 
ingo@300:         String type = XMLUtils.xpathString(
ingo@300:             format, XPATH_OUT_TYPE, ArtifactNamespaceContext.INSTANCE);
ingo@300: 
ingo@300:         OutGenerator generator = getOutGenerator(context, name, type);
ingo@300:         if (generator == null) {
ingo@300:             log.error("There is no generator specified for output: " + type);
ingo@300:             // TODO throw an exception.
ingo@300: 
ingo@300:             return;
ingo@300:         }
ingo@300: 
ingo@300:         generator.init(format, out, context);
ingo@300: 
ingo@300:         try {
ingo@300:             Object[][] container = getArtifactsWithAttribute(context);
ingo@300: 
ingo@300:             for (Object[] obj: container) {
ingo@300:                 generator.doOut((Artifact) obj[0], (Document) obj[1]);
ingo@300:             }
ingo@300:         }
ingo@300:         catch (ArtifactDatabaseException ade) {
ingo@300:             log.error(ade, ade);
ingo@300:         }
ingo@300: 
ingo@300:         generator.generate();
ingo@300:     }
ingo@300: 
ingo@300: 
ingo@300:     /**
ingo@300:      * This method returns the list of artifact UUIDs that this collections
ingo@300:      * contains.
ingo@300:      *
ingo@300:      * @param context The CallContext that is necessary to get information about
ingo@300:      * the ArtifactDatabase.
ingo@300:      *
ingo@300:      * @return a list of uuids.
ingo@300:      */
ingo@300:     protected String[] getArtifactUUIDs(CallContext context)
ingo@300:     throws    ArtifactDatabaseException
ingo@300:     {
ingo@300:         log.debug("FLYSArtifactCollection.getArtifactUUIDs");
ingo@300: 
ingo@300:         ArtifactDatabase db = context.getDatabase();
ingo@300:         CallMeta meta       = context.getMeta();
ingo@300: 
ingo@300:         Document itemList = db.listCollectionArtifacts(identifier(), meta);
ingo@300:         NodeList items    = (NodeList) XMLUtils.xpath(
ingo@300:             itemList,
ingo@300:             XPATH_COLLECTION_ITEMS,
ingo@300:             XPathConstants.NODESET,
ingo@300:             ArtifactNamespaceContext.INSTANCE);
ingo@300: 
ingo@300:         if (items == null || items.getLength() == 0) {
ingo@300:             log.debug("No artifacts found in this collection.");
ingo@300:             return null;
ingo@300:         }
ingo@300: 
ingo@300:         int num = items.getLength();
ingo@300: 
ingo@300:         List<String> uuids = new ArrayList<String>(num);
ingo@300: 
ingo@300:         for (int i = 0; i < num; i++) {
ingo@300:             String uuid = XMLUtils.xpathString(
ingo@300:                 items.item(i),
ingo@300:                 "@art:uuid",
ingo@300:                 ArtifactNamespaceContext.INSTANCE);
ingo@300: 
ingo@300:             if (uuid != null && uuid.trim().length() != 0) {
ingo@300:                 uuids.add(uuid);
ingo@300:             }
ingo@300:         }
ingo@300: 
ingo@300:         return (String[]) uuids.toArray(new String[uuids.size()]);
ingo@300:     }
ingo@300: 
ingo@300: 
ingo@300:     /**
ingo@300:      * Returns a concrete Artifact of this collection specified by its uuid.
ingo@300:      *
ingo@300:      * @param uuid The Artifact's uuid.
ingo@300:      * @param context The CallContext.
ingo@300:      *
ingo@300:      * @return an Artifact.
ingo@300:      */
ingo@300:     protected Artifact getArtifact(String uuid, CallContext context)
ingo@300:     throws    ArtifactDatabaseException
ingo@300:     {
ingo@300:         log.debug("FLYSArtifactCollection.getArtifact");
ingo@300: 
ingo@300:         Backend backend               = Backend.getInstance();
ingo@300:         PersistentArtifact persistent = backend.getArtifact(uuid);
ingo@300: 
ingo@300:         return persistent != null ? persistent.getArtifact() : null;
ingo@300:     }
ingo@300: 
ingo@300: 
ingo@300:     /**
ingo@300:      * Returns the attribute that belongs to an artifact stored in this
ingo@300:      * collection.
ingo@300:      *
ingo@300:      * @param uuid The Artifact's uuid.
ingo@300:      * @param context The CallContext.
ingo@300:      *
ingo@300:      * @return an attribute in form of a document.
ingo@300:      */
ingo@300:     protected Document getArtifactAttribute(String uuid, CallContext context)
ingo@300:     throws    ArtifactDatabaseException
ingo@300:     {
ingo@300:         log.debug("FLYSArtifactCollection.getArtifactAttribute");
ingo@300: 
ingo@300:         // TODO FILL ME
ingo@300:         return null;
ingo@300:     }
ingo@300: 
ingo@300: 
ingo@300:     /**
ingo@300:      * Returns a list of Artifact/Attribute pairs.
ingo@300:      *
ingo@300:      * @param context The CallContext.
ingo@300:      *
ingo@300:      * @return a list of Artifact/Attribute pairs.
ingo@300:      */
ingo@300:     protected Object[][] getArtifactsWithAttribute(CallContext context)
ingo@300:     throws    ArtifactDatabaseException
ingo@300:     {
ingo@300:         log.debug("FLYSArtifactCollection.getArtifactWithAttribute");
ingo@300: 
ingo@300:         ArtifactDatabase db = context.getDatabase();
ingo@300:         CallMeta meta       = context.getMeta();
ingo@300: 
ingo@300:         String[] uuids = getArtifactUUIDs(context);
ingo@300:         Object[][] awa = new Object[uuids.length][2];
ingo@300: 
ingo@300:         for (int i = 0; i < uuids.length; i++) {
ingo@300:             try {
ingo@300:                 Artifact artifact  = getArtifact(uuids[i], context);
ingo@300:                 Document attribute = getArtifactAttribute(uuids[i], context);
ingo@300: 
ingo@300:                 if (artifact == null) {
ingo@300:                     log.warn("Artifact '" + uuids[i] + "' is not existing.");
ingo@300:                     continue;
ingo@300:                 }
ingo@300: 
ingo@300:                 awa[i][0] = artifact;
ingo@300:                 awa[i][1] = attribute;
ingo@300:             }
ingo@300:             catch (ArtifactDatabaseException ade) {
ingo@300:                 log.warn(ade, ade);
ingo@300:             }
ingo@300:         }
ingo@300: 
ingo@300:         return awa;
ingo@300:     }
ingo@300: 
ingo@300: 
ingo@300:     /**
ingo@300:      * Returns the OutGenerator for a specified <i>type</i>.
ingo@300:      *
ingo@300:      * @param name The name of the output type.
ingo@300:      * @param type Defines the type of the desired OutGenerator.
ingo@300:      *
ingo@300:      * @return The OutGenerator specified by <i>type</i>.
ingo@300:      */
ingo@300:     protected OutGenerator getOutGenerator(
ingo@300:         CallContext context,
ingo@300:         String      name,
ingo@300:         String      type)
ingo@300:     {
ingo@300:         FLYSContext flysContext = context instanceof FLYSContext
ingo@300:             ? (FLYSContext) context
ingo@300:             : (FLYSContext) context.globalContext();
ingo@300: 
ingo@300:         Map<String, Class> generators = (Map<String, Class>)
ingo@300:             flysContext.get(FLYSContext.OUTGENERATORS_KEY);
ingo@300: 
ingo@300:         if (generators == null) {
ingo@300:             log.error("No output generators found in the running application!");
ingo@300:             return null;
ingo@300:         }
ingo@300: 
ingo@300:         Class clazz = generators.get(type);
ingo@300: 
ingo@300:         try {
ingo@300:             return clazz != null ? (OutGenerator) clazz.newInstance() : null;
ingo@300:         }
ingo@300:         catch (InstantiationException ie) {
ingo@300:             log.error(ie, ie);
ingo@300:         }
ingo@300:         catch (IllegalAccessException iae) {
ingo@300:             log.error(iae, iae);
ingo@300:         }
ingo@300: 
ingo@300:         return null;
ingo@300:     }
ingo@300: 
ingo@300: 
ingo@147:     protected Element buildArtifactNode(
ingo@293:         ArtifactDatabase        database,
ingo@293:         String                  uuid,
ingo@147:         CallContext             context,
ingo@147:         XMLUtils.ElementCreator ec)
ingo@293:     throws ArtifactDatabaseException
ingo@147:     {
ingo@293:         log.debug("Append artifact '" + uuid + "' to collection description");
ingo@147: 
ingo@293:         // XXX I am not sure if it works well every time with an empty document
ingo@293:         // in the describe operation of an artifact.
ingo@293:         Document description = database.describe(uuid, null, context.getMeta());
ingo@147: 
ingo@293:         String hash = "MYHASH";
ingo@293:         // TODO
ingo@156: 
ingo@147:         Element ci   = ec.create("artifact");
ingo@148:         ec.addAttr(ci, "uuid", uuid, true);
ingo@293:         ec.addAttr(ci, "hash", hash, true);
ingo@147: 
ingo@293:         Node outputModes = (Node) XMLUtils.xpath(
ingo@147:             description,
ingo@147:             XPATH_ARTIFACT_OUTPUTMODES,
ingo@147:             XPathConstants.NODE,
ingo@147:             ArtifactNamespaceContext.INSTANCE);
ingo@147: 
ingo@147:         if (outputModes != null) {
ingo@147:             Document doc = ci.getOwnerDocument();
ingo@147:             ci.appendChild(doc.importNode(outputModes, true));
ingo@147:         }
ingo@147: 
ingo@147:         return ci;
ingo@147:     }
ingo@147: }
ingo@147: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :