[Bigdata-commit] SF.net SVN: bigdata:[4030] branches/JOURNAL_HA_BRANCH/bigdata-sails/src/ java/com/bigdata/rdf/sail/BigdataEvaluationStrategyImpl2.java

[<mrp...@us...>]

Revision: 4030
          http://bigdata.svn.sourceforge.net/bigdata/?rev=4030&view=rev
Author:   mrpersonick
Date:     2010-12-21 15:17:52 +0000 (Tue, 21 Dec 2010)

Log Message:
-----------
comments

Modified Paths:
--------------
    branches/JOURNAL_HA_BRANCH/bigdata-sails/src/java/com/bigdata/rdf/sail/BigdataEvaluationStrategyImpl2.java

Modified: branches/JOURNAL_HA_BRANCH/bigdata-sails/src/java/com/bigdata/rdf/sail/BigdataEvaluationStrategyImpl2.java
===================================================================
--- branches/JOURNAL_HA_BRANCH/bigdata-sails/src/java/com/bigdata/rdf/sail/BigdataEvaluationStrategyImpl2.java	2010-12-21 15:13:44 UTC (rev 4029)
+++ branches/JOURNAL_HA_BRANCH/bigdata-sails/src/java/com/bigdata/rdf/sail/BigdataEvaluationStrategyImpl2.java	2010-12-21 15:17:52 UTC (rev 4030)
@@ -748,15 +748,30 @@
         
         // generate tails
         Collection<IPredicate> tails = new LinkedList<IPredicate>();
+        
         // keep a list of free text searches for later to solve a named graphs
         // problem
         final Map<IPredicate, StatementPattern> searches = 
             new HashMap<IPredicate, StatementPattern>();
        
+        /*
+         * deal with free text search tails first. need to match up search
+         * metadata tails with the searches themselves. ie:
+         * 
+         * select *
+         * where {
+         *   ?s bd:search "foo" .
+         *   ?s bd:relevance ?score .
+         * }
+         */
+        // the statement patterns for the searches themselves
         final Set<StatementPattern> searchMetadata1 =
         	new LinkedHashSet<StatementPattern>();
+        // the statement patterns for metadata about the searches
         final Map<Var, Set<StatementPattern>> searchMetadata2 =
         	new LinkedHashMap<Var, Set<StatementPattern>>();
+        // do a first pass to gather up the actual searches and take them out
+        // of the master list of statement patterns
         Iterator<Map.Entry<StatementPattern, Boolean>> it = 
         	stmtPatterns.entrySet().iterator();
         while (it.hasNext()) {
@@ -773,6 +788,7 @@
         		}
         	}
         }
+        // do a second pass to get the search metadata
         it = stmtPatterns.entrySet().iterator();
         while (it.hasNext()) {
         	final StatementPattern sp = it.next().getKey();


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