/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.lucene.util;
import java.io.IOException;
import java.util.BitSet;
import org.apache.lucene.search.DocIdSetIterator;
public class TestFixedBitSet extends BaseDocIdSetTestCase<FixedBitSet> {
@Override
public FixedBitSet copyOf(BitSet bs, int length) throws IOException {
final FixedBitSet set = new FixedBitSet(length);
for (int doc = bs.nextSetBit(0); doc != -1; doc = bs.nextSetBit(doc + 1)) {
set.set(doc);
}
return set;
}
void doGet(BitSet a, FixedBitSet b) {
int max = b.length();
for (int i=0; i<max; i++) {
if (a.get(i) != b.get(i)) {
fail("mismatch: BitSet=["+i+"]="+a.get(i));
}
}
}
void doNextSetBit(BitSet a, FixedBitSet b) {
int aa=-1,bb=-1;
do {
aa = a.nextSetBit(aa+1);
bb = bb < b.length()-1 ? b.nextSetBit(bb+1) : -1;
assertEquals(aa,bb);
} while (aa>=0);
}
void doPrevSetBit(BitSet a, FixedBitSet b) {
int aa = a.size() + random().nextInt(100);
int bb = aa;
do {
// aa = a.prevSetBit(aa-1);
aa--;
while ((aa >= 0) && (! a.get(aa))) {
aa--;
}
if (b.length() == 0) {
bb = -1;
} else if (bb > b.length()-1) {
bb = b.prevSetBit(b.length()-1);
} else if (bb < 1) {
bb = -1;
} else {
bb = bb >= 1 ? b.prevSetBit(bb-1) : -1;
}
assertEquals(aa,bb);
} while (aa>=0);
}
// test interleaving different FixedBitSetIterator.next()/skipTo()
void doIterate(BitSet a, FixedBitSet b, int mode) throws IOException {
if (mode==1) doIterate1(a, b);
if (mode==2) doIterate2(a, b);
}
void doIterate1(BitSet a, FixedBitSet b) throws IOException {
int aa=-1,bb=-1;
DocIdSetIterator iterator = b.iterator();
do {
aa = a.nextSetBit(aa+1);
bb = (bb < b.length() && random().nextBoolean()) ? iterator.nextDoc() : iterator.advance(bb + 1);
assertEquals(aa == -1 ? DocIdSetIterator.NO_MORE_DOCS : aa, bb);
} while (aa>=0);
}
void doIterate2(BitSet a, FixedBitSet b) throws IOException {
int aa=-1,bb=-1;
DocIdSetIterator iterator = b.iterator();
do {
aa = a.nextSetBit(aa+1);
bb = random().nextBoolean() ? iterator.nextDoc() : iterator.advance(bb + 1);
assertEquals(aa == -1 ? DocIdSetIterator.NO_MORE_DOCS : aa, bb);
} while (aa>=0);
}
void doRandomSets(int maxSize, int iter, int mode) throws IOException {
BitSet a0=null;
FixedBitSet b0=null;
for (int i=0; i<iter; i++) {
int sz = _TestUtil.nextInt(random(), 2, maxSize);
BitSet a = new BitSet(sz);
FixedBitSet b = new FixedBitSet(sz);
// test the various ways of setting bits
if (sz>0) {
int nOper = random().nextInt(sz);
for (int j=0; j<nOper; j++) {
int idx;
idx = random().nextInt(sz);
a.set(idx);
b.set(idx);
idx = random().nextInt(sz);
a.clear(idx);
b.clear(idx);
idx = random().nextInt(sz);
a.flip(idx);
b.flip(idx, idx+1);
idx = random().nextInt(sz);
a.flip(idx);
b.flip(idx, idx+1);
boolean val2 = b.get(idx);
boolean val = b.getAndSet(idx);
assertTrue(val2 == val);
assertTrue(b.get(idx));
if (!val) b.clear(idx);
assertTrue(b.get(idx) == val);
}
}
// test that the various ways of accessing the bits are equivalent
doGet(a,b);
// test ranges, including possible extension
int fromIndex, toIndex;
fromIndex = random().nextInt(sz/2);
toIndex = fromIndex + random().nextInt(sz - fromIndex);
BitSet aa = (BitSet)a.clone(); aa.flip(fromIndex,toIndex);
FixedBitSet bb = b.clone(); bb.flip(fromIndex,toIndex);
doIterate(aa,bb, mode); // a problem here is from flip or doIterate
fromIndex = random().nextInt(sz/2);
toIndex = fromIndex + random().nextInt(sz - fromIndex);
aa = (BitSet)a.clone(); aa.clear(fromIndex,toIndex);
bb = b.clone(); bb.clear(fromIndex,toIndex);
doNextSetBit(aa,bb); // a problem here is from clear() or nextSetBit
doPrevSetBit(aa,bb);
fromIndex = random().nextInt(sz/2);
toIndex = fromIndex + random().nextInt(sz - fromIndex);
aa = (BitSet)a.clone(); aa.set(fromIndex,toIndex);
bb = b.clone(); bb.set(fromIndex,toIndex);
doNextSetBit(aa,bb); // a problem here is from set() or nextSetBit
doPrevSetBit(aa,bb);
if (b0 != null && b0.length() <= b.length()) {
assertEquals(a.cardinality(), b.cardinality());
BitSet a_and = (BitSet)a.clone(); a_and.and(a0);
BitSet a_or = (BitSet)a.clone(); a_or.or(a0);
BitSet a_andn = (BitSet)a.clone(); a_andn.andNot(a0);
FixedBitSet b_and = b.clone(); assertEquals(b,b_and); b_and.and(b0);
FixedBitSet b_or = b.clone(); b_or.or(b0);
FixedBitSet b_andn = b.clone(); b_andn.andNot(b0);
assertEquals(a0.cardinality(), b0.cardinality());
assertEquals(a_or.cardinality(), b_or.cardinality());
doIterate(a_and,b_and, mode);
doIterate(a_or,b_or, mode);
doIterate(a_andn,b_andn, mode);
assertEquals(a_and.cardinality(), b_and.cardinality());
assertEquals(a_or.cardinality(), b_or.cardinality());
assertEquals(a_andn.cardinality(), b_andn.cardinality());
}
a0=a;
b0=b;
}
}
// large enough to flush obvious bugs, small enough to run in <.5 sec as part of a
// larger testsuite.
public void testSmall() throws IOException {
doRandomSets(atLeast(1200), atLeast(1000), 1);
doRandomSets(atLeast(1200), atLeast(1000), 2);
}
// uncomment to run a bigger test (~2 minutes).
/*
public void testBig() {
doRandomSets(2000,200000, 1);
doRandomSets(2000,200000, 2);
}
*/
public void testEquals() {
// This test can't handle numBits==0:
final int numBits = random().nextInt(2000) + 1;
FixedBitSet b1 = new FixedBitSet(numBits);
FixedBitSet b2 = new FixedBitSet(numBits);
assertTrue(b1.equals(b2));
assertTrue(b2.equals(b1));
for(int iter=0;iter<10*RANDOM_MULTIPLIER;iter++) {
int idx = random().nextInt(numBits);
if (!b1.get(idx)) {
b1.set(idx);
assertFalse(b1.equals(b2));
assertFalse(b2.equals(b1));
b2.set(idx);
assertTrue(b1.equals(b2));
assertTrue(b2.equals(b1));
}
}
// try different type of object
assertFalse(b1.equals(new Object()));
}
public void testHashCodeEquals() {
// This test can't handle numBits==0:
final int numBits = random().nextInt(2000) + 1;
FixedBitSet b1 = new FixedBitSet(numBits);
FixedBitSet b2 = new FixedBitSet(numBits);
assertTrue(b1.equals(b2));
assertTrue(b2.equals(b1));
for(int iter=0;iter<10*RANDOM_MULTIPLIER;iter++) {
int idx = random().nextInt(numBits);
if (!b1.get(idx)) {
b1.set(idx);
assertFalse(b1.equals(b2));
assertFalse(b1.hashCode() == b2.hashCode());
b2.set(idx);
assertEquals(b1, b2);
assertEquals(b1.hashCode(), b2.hashCode());
}
}
}
public void testSmallBitSets() {
// Make sure size 0-10 bit sets are OK:
for(int numBits=0;numBits<10;numBits++) {
FixedBitSet b1 = new FixedBitSet(numBits);
FixedBitSet b2 = new FixedBitSet(numBits);
assertTrue(b1.equals(b2));
assertEquals(b1.hashCode(), b2.hashCode());
assertEquals(0, b1.cardinality());
if (numBits > 0) {
b1.set(0, numBits);
assertEquals(numBits, b1.cardinality());
b1.flip(0, numBits);
assertEquals(0, b1.cardinality());
}
}
}
private FixedBitSet makeFixedBitSet(int[] a, int numBits) {
FixedBitSet bs;
if (random().nextBoolean()) {
int bits2words = FixedBitSet.bits2words(numBits);
long[] words = new long[bits2words + random().nextInt(100)];
for (int i = bits2words; i < words.length; i++) {
words[i] = random().nextLong();
}
bs = new FixedBitSet(words, numBits);
} else {
bs = new FixedBitSet(numBits);
}
for (int e: a) {
bs.set(e);
}
return bs;
}
private BitSet makeBitSet(int[] a) {
BitSet bs = new BitSet();
for (int e: a) {
bs.set(e);
}
return bs;
}
private void checkPrevSetBitArray(int [] a, int numBits) {
FixedBitSet obs = makeFixedBitSet(a, numBits);
BitSet bs = makeBitSet(a);
doPrevSetBit(bs, obs);
}
public void testPrevSetBit() {
checkPrevSetBitArray(new int[] {}, 0);
checkPrevSetBitArray(new int[] {0}, 1);
checkPrevSetBitArray(new int[] {0,2}, 3);
}
private void checkNextSetBitArray(int [] a, int numBits) {
FixedBitSet obs = makeFixedBitSet(a, numBits);
BitSet bs = makeBitSet(a);
doNextSetBit(bs, obs);
}
public void testNextBitSet() {
int[] setBits = new int[0+random().nextInt(1000)];
for (int i = 0; i < setBits.length; i++) {
setBits[i] = random().nextInt(setBits.length);
}
checkNextSetBitArray(setBits, setBits.length + random().nextInt(10));
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);
}
}