LUCENE-1776: Add an option to not collect payloads for an ordered SpanNearQuery. Payloads were not lazily loaded in this case as the javadocs implied. If you have payloads and want to use an ordered SpanNearQuery that does not need to use the payloads, you can disable loading them with a new constructor switch.

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@800393 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -648,6 +648,12 @@ New features
     has been deprecated with this patch.
     (Luis Alves and Adriano Campos via Michael Busch)
     
+36. LUCENE-1776: Add an option to not collect payloads for an ordered
+    SpanNearQuery. Payloads were not lazily loaded in this case as
+    the javadocs implied. If you have payloads and want to use an ordered
+    SpanNearQuery that does not need to use the payloads, you can
+    disable loading them with a new constructor switch.  (Mark Miller)
+   
 Optimizations
 
  1. LUCENE-1427: Fixed QueryWrapperFilter to not waste time computing

src/java/org/apache/lucene/search/spans/NearSpansOrdered.java

@@ -72,13 +72,19 @@ class NearSpansOrdered implements PayloadSpans {
   };
   
   private SpanNearQuery query;
+  private boolean collectPayloads = true;
   
-  public NearSpansOrdered(SpanNearQuery spanNearQuery, IndexReader reader)
+  public NearSpansOrdered(SpanNearQuery spanNearQuery, IndexReader reader) throws IOException {
+    this(spanNearQuery, reader, true);
+  }
+
+  public NearSpansOrdered(SpanNearQuery spanNearQuery, IndexReader reader, boolean collectPayloads)
   throws IOException {
     if (spanNearQuery.getClauses().length < 2) {
       throw new IllegalArgumentException("Less than 2 clauses: "
                                          + spanNearQuery);
     }
+    this.collectPayloads = collectPayloads;
     allowedSlop = spanNearQuery.getSlop();
     SpanQuery[] clauses = spanNearQuery.getClauses();
     subSpans = new PayloadSpans[clauses.length];
@@ -101,6 +107,7 @@ class NearSpansOrdered implements PayloadSpans {
   public int end() { return matchEnd; }
 
   // TODO: Remove warning after API has been finalized
+  // TODO: Would be nice to be able to lazy load payloads
   public Collection/*<byte[]>*/ getPayload() throws IOException {
     return matchPayload;
   }
@@ -122,7 +129,9 @@ class NearSpansOrdered implements PayloadSpans {
       }
       more = true;
     }
+    if(collectPayloads) {
       matchPayload.clear();
+    }
     return advanceAfterOrdered();
   }
 
@@ -145,7 +154,9 @@ class NearSpansOrdered implements PayloadSpans {
         return false;
       }
     }
+    if(collectPayloads) {
       matchPayload.clear();
+    }
     return advanceAfterOrdered();
   }
   
@@ -250,7 +261,7 @@ class NearSpansOrdered implements PayloadSpans {
     int lastEnd = matchEnd;
     for (int i = subSpans.length - 2; i >= 0; i--) {
       PayloadSpans prevSpans = subSpans[i];
-      if (prevSpans.isPayloadAvailable()) {
+      if (collectPayloads && prevSpans.isPayloadAvailable()) {
         Collection payload = prevSpans.getPayload();
         possiblePayload = new ArrayList(payload.size());
         possiblePayload.addAll(payload);
@@ -274,7 +285,7 @@ class NearSpansOrdered implements PayloadSpans {
           } else { // prevSpans still before (lastStart, lastEnd)
             prevStart = ppStart;
             prevEnd = ppEnd;
-            if (prevSpans.isPayloadAvailable()) {
+            if (collectPayloads && prevSpans.isPayloadAvailable()) {
               Collection payload = prevSpans.getPayload();
               possiblePayload = new ArrayList(payload.size());
               possiblePayload.addAll(payload);
@@ -283,7 +294,7 @@ class NearSpansOrdered implements PayloadSpans {
         }
       }
 
-      if (possiblePayload != null) {
+      if (collectPayloads && possiblePayload != null) {
         possibleMatchPayloads.addAll(possiblePayload);
       }
       
@@ -302,7 +313,7 @@ class NearSpansOrdered implements PayloadSpans {
     
     boolean match = matchSlop <= allowedSlop;
     
-    if(match && possibleMatchPayloads.size() > 0) {
+    if(collectPayloads && match && possibleMatchPayloads.size() > 0) {
       matchPayload.addAll(possibleMatchPayloads);
     }
 

src/java/org/apache/lucene/search/spans/PayloadSpans.java

@@ -33,9 +33,11 @@ public interface PayloadSpans extends Spans{
    * This is invalid until {@link #next()} is called for
    * the first time.
    * This method must not be called more than once after each call
-   * of {@link #next()}. However, payloads are loaded lazily,
+   * of {@link #next()}. However, most SpanQuerys load payloads lazily,
    * so if the payload data for the current position is not needed,
-   * this method may not be called at all for performance reasons.<br>
+   * this method may not be called at all for performance reasons.
+   * The ordered case of SpanNearQuery does not load lazily and has
+   * an option to turn off payload loading.<br>
    * <br>
     * Note that the return type is a collection, thus the ordering should not be relied upon.
     * <br/>

src/java/org/apache/lucene/search/spans/SpanNearQuery.java

@@ -39,12 +39,17 @@ public class SpanNearQuery extends SpanQuery implements Cloneable {
   private boolean inOrder;
 
   private String field;
+  private boolean collectPayloads;
 
   /** Construct a SpanNearQuery.  Matches spans matching a span from each
    * clause, with up to <code>slop</code> total unmatched positions between
    * them.  * When <code>inOrder</code> is true, the spans from each clause
    * must be * ordered as in <code>clauses</code>. */
   public SpanNearQuery(SpanQuery[] clauses, int slop, boolean inOrder) {
+    this(clauses, slop, inOrder, true);     
+  }
+  
+  public SpanNearQuery(SpanQuery[] clauses, int slop, boolean inOrder, boolean collectPayloads) {
 
     // copy clauses array into an ArrayList
     this.clauses = new ArrayList(clauses.length);
@@ -57,7 +62,7 @@ public class SpanNearQuery extends SpanQuery implements Cloneable {
       }
       this.clauses.add(clause);
     }
-
+    this.collectPayloads = collectPayloads;
     this.slop = slop;
     this.inOrder = inOrder;
   }
@@ -126,7 +131,7 @@ public class SpanNearQuery extends SpanQuery implements Cloneable {
       return ((SpanQuery)clauses.get(0)).getPayloadSpans(reader);
 
     return inOrder
-            ? (PayloadSpans) new NearSpansOrdered(this, reader)
+            ? (PayloadSpans) new NearSpansOrdered(this, reader, collectPayloads)
             : (PayloadSpans) new NearSpansUnordered(this, reader);
   }