Added Discovery Facet to distinguish between items with and without full text.

dspace-api/src/main/java/org/dspace/discovery/SolrServiceFullTextFilterPlugin.java

@@ -0,0 +1,73 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+package org.dspace.discovery;
+
+import java.sql.SQLException;
+
+import org.apache.log4j.Logger;
+import org.apache.solr.common.SolrInputDocument;
+import org.dspace.content.Bundle;
+import org.dspace.content.DSpaceObject;
+import org.dspace.content.Item;
+import org.dspace.core.Context;
+import org.dspace.discovery.SolrServiceIndexPlugin;
+
+/**
+ * This plugin adds three fields to the solr index to make a facet with/without
+ * full text possible. It is activated simply by adding this class as a bean to
+ * discovery.xml.
+ * 
+ * The facet is added to Discovery in the usual way (create a searchFilter bean
+ * and add it to the expected place) just with an empty list of used metadata
+ * fields because there are none.
+ * 
+ * @author Christian Scheible <christian.scheible@uni-konstanz.de>
+ * 
+ */
+public class SolrServiceFullTextFilterPlugin implements SolrServiceIndexPlugin
+{
+
+    private static final Logger log = Logger
+            .getLogger(SolrServiceFullTextFilterPlugin.class);
+
+    @Override
+    public void additionalIndex(Context context, DSpaceObject dso,
+            SolrInputDocument document)
+    {
+        if (dso instanceof Item)
+        {
+            Item item = (Item) dso;
+            Bundle[] bundles;
+            try
+            {
+                bundles = item.getBundles("ORIGINAL");
+                // _keyword and _filter because
+                // they are needed in order to work as a facet and filter.
+                if (bundles.length == 0)
+                {
+                    // no full text attached.
+                    document.addField("has_full_text", false);
+                    document.addField("has_full_text_keyword", false);
+                    document.addField("has_full_text_filter", false);
+                }
+                else
+                {
+                    document.addField("has_full_text", true);
+                    document.addField("has_full_text_keyword", true);
+                    document.addField("has_full_text_filter", true);
+                }
+            }
+            catch (SQLException e)
+            {
+                log.error("Error adding additional solr field for full text facet: "
+                        + e.getMessage());
+            }
+        }
+
+    }
+}