documentation to the PruneFloatingIslands process has been added

opentripplanner-graph-builder/samples/graph-config.xml

@@ -34,9 +34,9 @@
     </bean>
 
     <bean id="floatingIslands" class="org.opentripplanner.graph_builder.impl.PruneFloatingIslands">
-        <property name="maxIslandSize" value="1000 "/>
+        <property name="islandWithoutStopsMaxSize" value="1000 "/>
         <property name="islandLogFile" value="{graphPath}/island.csv"/>
-        <property name="islandWithStopMaxSize" value="20"/>
+        <property name="islandWithStopsMaxSize" value="20"/>
         <property name="transitToStreetNetwork" ref ="transitStreetLink"/>
     </bean>
 

opentripplanner-graph-builder/src/main/java/org/opentripplanner/graph_builder/impl/PruneFloatingIslands.java

@@ -13,32 +13,48 @@ the License, or (at your option) any later version.
 
 package org.opentripplanner.graph_builder.impl;
 
-import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 
-import lombok.Getter;
 import lombok.Setter;
-import org.apache.log4j.*;
-import org.apache.log4j.Logger;
 import org.opentripplanner.common.StreetUtils;
 import org.opentripplanner.graph_builder.services.GraphBuilder;
 import org.opentripplanner.routing.graph.Graph;
-import org.opentripplanner.routing.services.StreetVertexIndexService;
 import org.slf4j.*;
 
+/**
+ * this module is part of the  {@link GraphBuilder} process. it design to remove small isolated islands form the graph.
+ * Island created when there is no connectivity in the map, island acts like trap since there
+ * is no connectivity there is no way in or out the island.
+ * the module distinguish between two island types one with transit stops and without stops.
+ *
+ *
+ *
+ */
 public class PruneFloatingIslands implements GraphBuilder {
 
     private static org.slf4j.Logger _log = LoggerFactory.getLogger(PruneFloatingIslands.class);
 
+    /**
+     * this field indicate the maximum size for island without stops
+     * island under this size will be pruned.
+     */
     @Setter
-    private int maxIslandSize = 40;
+    private int islandWithoutStopsMaxSize = 40;
 
+    /**
+     * this field indicate the maximum size for island with stops
+     * island under this size will be pruned.
+     */
     @Setter
-    private int islandWithStopMaxSize = 5;
+    private int islandWithStopsMaxSize = 5;
 
+    /**
+     * The name for output file for this process, the file will store information about the islands were found and if they were pruned.
+     * If the value is an empty string there will be no output file.
+     */
     @Setter
     private String islandLogFile = "";
 
@@ -50,14 +66,18 @@ public List<String> provides() {
     }
 
     public List<String> getPrerequisites() {
-//        return Arrays.asList("streets","linking");
+        /**this module can run after the street module only but if
+         * the street linker did not run then it couldn't identifies island with stops.
+         * so if the need is to distinguish between island with stops or without stops
+         * as explained before this module should run after the streets and the linker modules.
+         */
         return Arrays.asList("streets");
     }
 
     @Override
     public void buildGraph(Graph graph, HashMap<Class<?>, Object> extra) {
         _log.warn("Pruning isolated islands ...");
-        StreetUtils.pruneFloatingIslands(graph, maxIslandSize, islandWithStopMaxSize,
+        StreetUtils.pruneFloatingIslands(graph, islandWithoutStopsMaxSize, islandWithStopsMaxSize,
                 LoggerAppenderProvider.createCsvFile4LoggerCat(islandLogFile, "islands"));
         if(transitToStreetNetwork == null){
             _log.warn("Could not reconnect stop, TransitToStreetNetworkGraphBuilder was not provided");