--- /dev/null
+package org.argeo.slc.repo;
+
+import javax.jcr.Node;
+import javax.jcr.observation.EventListener;
+
+/**
+ * Adds metadata to an existing node, ideally via observation after it has been
+ * added. There is a similar concept in ModeShape with which this abstraction
+ * may be merged in the future.
+ */
+public interface NodeIndexer {
+ /**
+ * Whether the node at this path will be supported. This is typically use in
+ * an {@link EventListener} before the node is loaded, and would apply on
+ * information contained in the path / file name: file extension, base path,
+ * etc. If the node needs to be loaded, the recommended approach is to
+ * return <code>true</code> here and wait for index to be called, possibly
+ * returning without processing if the node should not be indexed. While
+ * not strictly a requirement, this avoids to open sessions in the indexer,
+ * centralizing such tasks in the caller.
+ */
+ public Boolean support(String path);
+
+ /**
+ * Adds the metadata. This is the responsibility of the caller to save the
+ * underlying session.
+ */
+ public void index(Node node);
+}