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Posted to commits@lucene.apache.org by sh...@apache.org on 2013/10/13 10:21:33 UTC
svn commit: r1531627 - in /lucene/dev/trunk/lucene: CHANGES.txt
core/src/java/org/apache/lucene/util/FixedBitSet.java
core/src/test/org/apache/lucene/util/TestFixedBitSet.java
Author: shaie
Date: Sun Oct 13 08:21:32 2013
New Revision: 1531627
URL: http://svn.apache.org/r1531627
Log:
LUCENE-5277: Modify FixedBitSet copy constructor to take numBits to allow grow/shrink the new bitset
Modified:
lucene/dev/trunk/lucene/CHANGES.txt
lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/util/FixedBitSet.java
lucene/dev/trunk/lucene/core/src/test/org/apache/lucene/util/TestFixedBitSet.java
Modified: lucene/dev/trunk/lucene/CHANGES.txt
URL: http://svn.apache.org/viewvc/lucene/dev/trunk/lucene/CHANGES.txt?rev=1531627&r1=1531626&r2=1531627&view=diff
==============================================================================
--- lucene/dev/trunk/lucene/CHANGES.txt (original)
+++ lucene/dev/trunk/lucene/CHANGES.txt Sun Oct 13 08:21:32 2013
@@ -146,6 +146,10 @@ API Changes:
* LUCENE-5275: Change AttributeSource.toString() to display the current
state of attributes. (Robert Muir)
+* LUCENE-5277: Modify FixedBitSet copy constructor to take an additional
+ numBits parameter to allow growing/shrinking the copied bitset. You can
+ use FixedBitSet.clone() if you only need to clone the bitset. (Shai Erera)
+
Optimizations
* LUCENE-5225: The ToParentBlockJoinQuery only keeps tracks of the the child
Modified: lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/util/FixedBitSet.java
URL: http://svn.apache.org/viewvc/lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/util/FixedBitSet.java?rev=1531627&r1=1531626&r2=1531627&view=diff
==============================================================================
--- lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/util/FixedBitSet.java (original)
+++ lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/util/FixedBitSet.java Sun Oct 13 08:21:32 2013
@@ -35,7 +35,6 @@ import org.apache.lucene.search.DocIdSet
*
* @lucene.internal
**/
-
public final class FixedBitSet extends DocIdSet implements Bits {
private final long[] bits;
private final int numBits;
@@ -63,14 +62,18 @@ public final class FixedBitSet extends D
}
this.numBits = numBits;
this.bits = storedBits;
- }
+ }
- /** Makes full copy. */
- public FixedBitSet(FixedBitSet other) {
- bits = new long[other.wordLength];
- System.arraycopy(other.bits, 0, bits, 0, other.wordLength);
- numBits = other.numBits;
- wordLength = other.wordLength;
+ /**
+ * Makes a full copy of the bits, while allowing to expand/shrink the bitset.
+ * If {@code numBits < other.numBits}, then only the first {@code numBits}
+ * are copied from other.
+ */
+ public FixedBitSet(FixedBitSet other, int numBits) {
+ wordLength = bits2words(numBits);
+ bits = new long[wordLength];
+ System.arraycopy(other.bits, 0, bits, 0, Math.min(other.wordLength, wordLength));
+ this.numBits = numBits;
}
@Override
@@ -403,7 +406,7 @@ public final class FixedBitSet extends D
@Override
public FixedBitSet clone() {
- return new FixedBitSet(this);
+ return new FixedBitSet(this, numBits);
}
/** returns true if both sets have the same bits set */
Modified: lucene/dev/trunk/lucene/core/src/test/org/apache/lucene/util/TestFixedBitSet.java
URL: http://svn.apache.org/viewvc/lucene/dev/trunk/lucene/core/src/test/org/apache/lucene/util/TestFixedBitSet.java?rev=1531627&r1=1531626&r2=1531627&view=diff
==============================================================================
--- lucene/dev/trunk/lucene/core/src/test/org/apache/lucene/util/TestFixedBitSet.java (original)
+++ lucene/dev/trunk/lucene/core/src/test/org/apache/lucene/util/TestFixedBitSet.java Sun Oct 13 08:21:32 2013
@@ -328,7 +328,50 @@ public class TestFixedBitSet extends Bas
checkNextSetBitArray(new int[0], setBits.length + random().nextInt(10));
}
-}
-
+
+ public void testGrow() {
+ FixedBitSet bits = new FixedBitSet(5);
+ bits.set(1);
+ bits.set(4);
+
+ FixedBitSet newBits = new FixedBitSet(bits, 8); // grow within the word
+ assertTrue(newBits.get(1));
+ assertTrue(newBits.get(4));
+ newBits = new FixedBitSet(bits, 72); // grow beyond one word
+ assertTrue(newBits.get(1));
+ assertTrue(newBits.get(4));
+ }
+
+ public void testShrink() {
+ FixedBitSet bits = new FixedBitSet(72);
+ bits.set(1);
+ bits.set(4);
+ bits.set(69);
+
+ FixedBitSet newBits = new FixedBitSet(bits, 66); // shrink within the word
+ assertTrue(newBits.get(1));
+ assertTrue(newBits.get(4));
+ boolean hitError = true;
+ try {
+ newBits.get(69);
+ hitError = false;
+ } catch (AssertionError e) {
+ hitError = true;
+ }
+ assertTrue(hitError);
+ newBits = new FixedBitSet(bits, 8); // shrink beyond one word
+ assertTrue(newBits.get(1));
+ assertTrue(newBits.get(4));
+ hitError = true;
+ try {
+ newBits.get(69);
+ hitError = false;
+ } catch (AssertionError e) {
+ hitError = true;
+ }
+ assertTrue(hitError);
+ }
+
+}