Add missing javadoc

Author: ctrueden

src/main/java/org/scijava/plugin/FactoryPlugin.java

@@ -32,7 +32,7 @@
 import org.scijava.Typed;
 
 /**
- * TODO
+ * Interface for plugins that act as factories, creating objects on demand.
  *
  * @author Curtis Rueden
  * @param <D> Source data type.

src/main/java/org/scijava/search/SearchActionFactory.java

@@ -32,7 +32,12 @@
 import org.scijava.plugin.FactoryPlugin;
 
 /**
- * TODO
+ * SciJava plugin type for doing something with a {@link SearchResult}.
+ * <p>
+ * For example, {@code RunModuleSearchActionFactory} creates a
+ * {@link SearchAction} that executes the SciJava module described by a
+ * {@code ModuleSearchResult}.
+ * </p>
  *
  * @author Curtis Rueden
  */

src/main/java/org/scijava/search/SearchListener.java

@@ -37,6 +37,6 @@
  */
 public interface SearchListener {
 
-	/** TODO */
+	/** Invoked when a search is completed. */
 	void searchCompleted(SearchEvent event);
 }

src/main/java/org/scijava/search/SearchService.java

@@ -69,10 +69,10 @@ default List<SearchAction> actions(final SearchResult result) {
 			.map(factory -> factory.create(result)).collect(Collectors.toList());
 	}
 
-	/** TODO javadoc */
+	/** Gets whether the given searcher plugin is currently enabled. */
 	boolean enabled(Searcher s);
 
-	/** TODO javadoc */
+	/** Enables or disables the given searcher plugin. */
 	void setEnabled(Searcher s, boolean enabled);
 
 	@Override