From bddf5aea31f3ed34b43d26133de1671b2acbcc46 Mon Sep 17 00:00:00 2001
From: "Brian S. O'Neill" <bronee@gmail.com>
Date: Wed, 27 Sep 2006 23:51:49 +0000
Subject: Add support for faster full count.

---
 .../com/amazon/carbonado/qe/FullScanQueryExecutor.java    | 15 +++++++++++++++
 .../com/amazon/carbonado/repo/indexed/IndexedStorage.java |  4 ++++
 2 files changed, 19 insertions(+)

(limited to 'src/main')

diff --git a/src/main/java/com/amazon/carbonado/qe/FullScanQueryExecutor.java b/src/main/java/com/amazon/carbonado/qe/FullScanQueryExecutor.java
index dbf5690..b8035f0 100644
--- a/src/main/java/com/amazon/carbonado/qe/FullScanQueryExecutor.java
+++ b/src/main/java/com/amazon/carbonado/qe/FullScanQueryExecutor.java
@@ -51,6 +51,15 @@ public class FullScanQueryExecutor<S extends Storable> extends AbstractQueryExec
         mSupport = support;
     }
 
+    @Override
+    public long count(FilterValues<S> values) throws FetchException {
+        long count = mSupport.countAll();
+        if (count == -1) {
+            count = super.count(values);
+        }
+        return count;
+    }
+
     /**
      * Returns an open filter.
      */
@@ -82,6 +91,12 @@ public class FullScanQueryExecutor<S extends Storable> extends AbstractQueryExec
     public static interface Support<S extends Storable> {
         Class<S> getStorableType();
 
+        /**
+         * Counts all Storables. Implementation may return -1 to indicate that
+         * default count algorithm should be used.
+         */
+        long countAll() throws FetchException;
+
         /**
          * Perform a full scan of all Storables.
          */
diff --git a/src/main/java/com/amazon/carbonado/repo/indexed/IndexedStorage.java b/src/main/java/com/amazon/carbonado/repo/indexed/IndexedStorage.java
index 1fa1244..2901ea0 100644
--- a/src/main/java/com/amazon/carbonado/repo/indexed/IndexedStorage.java
+++ b/src/main/java/com/amazon/carbonado/repo/indexed/IndexedStorage.java
@@ -297,6 +297,10 @@ class IndexedStorage<S extends Storable> implements Storage<S>, StorageAccess<S>
         return new MergeSortBuffer<S>(mRootStorage);
     }
 
+    public long countAll() throws FetchException {
+        return mMasterStorage.query().count();
+    }
+
     public Cursor<S> fetchAll() throws FetchException {
         return mMasterStorage.query().fetch();
     }
-- 
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