package org.apache.lucene.util;
/**
* 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.
*/
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.OpenBitSet;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
public class TestNumericUtils extends LuceneTestCase {
public void testLongConversionAndOrdering() throws Exception {
// generate a series of encoded longs, each numerical one bigger than the one before
String last=null;
for (long l=-100000L; l<100000L; l++) {
String act=NumericUtils.longToPrefixCoded(l);
if (last!=null) {
// test if smaller
assertTrue("actual bigger than last", last.compareTo(act) < 0 );
}
// test is back and forward conversion works
assertEquals("forward and back conversion should generate same long", l, NumericUtils.prefixCodedToLong(act));
// next step
last=act;
}
}
public void testIntConversionAndOrdering() throws Exception {
// generate a series of encoded ints, each numerical one bigger than the one before
String last=null;
for (int i=-100000; i<100000; i++) {
String act=NumericUtils.intToPrefixCoded(i);
if (last!=null) {
// test if smaller
assertTrue("actual bigger than last", last.compareTo(act) < 0 );
}
// test is back and forward conversion works
assertEquals("forward and back conversion should generate same int", i, NumericUtils.prefixCodedToInt(act));
// next step
last=act;
}
}
public void testLongSpecialValues() throws Exception {
long[] vals=new long[]{
Long.MIN_VALUE, Long.MIN_VALUE+1, Long.MIN_VALUE+2, -5003400000000L,
-4000L, -3000L, -2000L, -1000L, -1L, 0L, 1L, 10L, 300L, 50006789999999999L, Long.MAX_VALUE-2, Long.MAX_VALUE-1, Long.MAX_VALUE
};
String[] prefixVals=new String[vals.length];
for (int i=0; i<vals.length; i++) {
prefixVals[i]=NumericUtils.longToPrefixCoded(vals[i]);
// check forward and back conversion
assertEquals( "forward and back conversion should generate same long", vals[i], NumericUtils.prefixCodedToLong(prefixVals[i]) );
// test if decoding values as int fails correctly
try {
NumericUtils.prefixCodedToInt(prefixVals[i]);
fail("decoding a prefix coded long value as int should fail");
} catch (NumberFormatException e) {
// worked
}
}
// check sort order (prefixVals should be ascending)
for (int i=1; i<prefixVals.length; i++) {
assertTrue( "check sort order", prefixVals[i-1].compareTo( prefixVals[i] ) < 0 );
}
// check the prefix encoding, lower precision should have the difference to original value equal to the lower removed bits
for (int i=0; i<vals.length; i++) {
for (int j=0; j<64; j++) {
long prefixVal=NumericUtils.prefixCodedToLong(NumericUtils.longToPrefixCoded(vals[i], j));
long mask=(1L << j) - 1L;
assertEquals( "difference between prefix val and original value for "+vals[i]+" with shift="+j, vals[i] & mask, vals[i]-prefixVal );
}
}
}
public void testIntSpecialValues() throws Exception {
int[] vals=new int[]{
Integer.MIN_VALUE, Integer.MIN_VALUE+1, Integer.MIN_VALUE+2, -64765767,
-4000, -3000, -2000, -1000, -1, 0, 1, 10, 300, 765878989, Integer.MAX_VALUE-2, Integer.MAX_VALUE-1, Integer.MAX_VALUE
};
String[] prefixVals=new String[vals.length];
for (int i=0; i<vals.length; i++) {
prefixVals[i]=NumericUtils.intToPrefixCoded(vals[i]);
// check forward and back conversion
assertEquals( "forward and back conversion should generate same int", vals[i], NumericUtils.prefixCodedToInt(prefixVals[i]) );
// test if decoding values as long fails correctly
try {
NumericUtils.prefixCodedToLong(prefixVals[i]);
fail("decoding a prefix coded int value as long should fail");
} catch (NumberFormatException e) {
// worked
}
}
// check sort order (prefixVals should be ascending)
for (int i=1; i<prefixVals.length; i++) {
assertTrue( "check sort order", prefixVals[i-1].compareTo( prefixVals[i] ) < 0 );
}
// check the prefix encoding, lower precision should have the difference to original value equal to the lower removed bits
for (int i=0; i<vals.length; i++) {
for (int j=0; j<32; j++) {
int prefixVal=NumericUtils.prefixCodedToInt(NumericUtils.intToPrefixCoded(vals[i], j));
int mask=(1 << j) - 1;
assertEquals( "difference between prefix val and original value for "+vals[i]+" with shift="+j, vals[i] & mask, vals[i]-prefixVal );
}
}
}
public void testDoubles() throws Exception {
double[] vals=new double[]{
Double.NEGATIVE_INFINITY, -2.3E25, -1.0E15, -1.0, -1.0E-1, -1.0E-2, -0.0,
+0.0, 1.0E-2, 1.0E-1, 1.0, 1.0E15, 2.3E25, Double.POSITIVE_INFINITY
};
long[] longVals=new long[vals.length];
// check forward and back conversion
for (int i=0; i<vals.length; i++) {
longVals[i]=NumericUtils.doubleToSortableLong(vals[i]);
assertTrue( "forward and back conversion should generate same double", Double.compare(vals[i], NumericUtils.sortableLongToDouble(longVals[i]))==0 );
}
// check sort order (prefixVals should be ascending)
for (int i=1; i<longVals.length; i++) {
assertTrue( "check sort order", longVals[i-1] < longVals[i] );
}
}
public void testFloats() throws Exception {
float[] vals=new float[]{
Float.NEGATIVE_INFINITY, -2.3E25f, -1.0E15f, -1.0f, -1.0E-1f, -1.0E-2f, -0.0f,
+0.0f, 1.0E-2f, 1.0E-1f, 1.0f, 1.0E15f, 2.3E25f, Float.POSITIVE_INFINITY
};
int[] intVals=new int[vals.length];
// check forward and back conversion
for (int i=0; i<vals.length; i++) {
intVals[i]=NumericUtils.floatToSortableInt(vals[i]);
assertTrue( "forward and back conversion should generate same double", Float.compare(vals[i], NumericUtils.sortableIntToFloat(intVals[i]))==0 );
}
// check sort order (prefixVals should be ascending)
for (int i=1; i<intVals.length; i++) {
assertTrue( "check sort order", intVals[i-1] < intVals[i] );
}
}
// INFO: Tests for trieCodeLong()/trieCodeInt() not needed because implicitely tested by range filter tests
/** Note: The neededBounds iterator must be unsigned (easier understanding what's happening) */
protected void assertLongRangeSplit(final long lower, final long upper, int precisionStep,
final boolean useBitSet, final Iterator neededBounds
) throws Exception {
final OpenBitSet bits=useBitSet ? new OpenBitSet(upper-lower+1) : null;
NumericUtils.splitLongRange(new NumericUtils.LongRangeBuilder() {
//@Override
public void addRange(long min, long max, int shift) {
assertTrue("min, max should be inside bounds", min>=lower && min<=upper && max>=lower && max<=upper);
if (useBitSet) for (long l=min; l<=max; l++) {
assertFalse("ranges should not overlap", bits.getAndSet(l-lower) );
}
// make unsigned longs for easier display and understanding
min ^= 0x8000000000000000L;
max ^= 0x8000000000000000L;
//System.out.println("new Long(0x"+Long.toHexString(min>>>shift)+"L),new Long(0x"+Long.toHexString(max>>>shift)+"L),");
assertEquals( "inner min bound", ((Long)neededBounds.next()).longValue(), min>>>shift);
assertEquals( "inner max bound", ((Long)neededBounds.next()).longValue(), max>>>shift);
}
}, precisionStep, lower, upper);
if (useBitSet) {
// after flipping all bits in the range, the cardinality should be zero
bits.flip(0,upper-lower+1);
assertTrue("The sub-range concenated should match the whole range", bits.isEmpty());
}
}
public void testSplitLongRange() throws Exception {
// a hard-coded "standard" range
assertLongRangeSplit(-5000L, 9500L, 4, true, Arrays.asList(new Long[]{
new Long(0x7fffffffffffec78L),new Long(0x7fffffffffffec7fL),
new Long(0x8000000000002510L),new Long(0x800000000000251cL),
new Long(0x7fffffffffffec8L), new Long(0x7fffffffffffecfL),
new Long(0x800000000000250L), new Long(0x800000000000250L),
new Long(0x7fffffffffffedL), new Long(0x7fffffffffffefL),
new Long(0x80000000000020L), new Long(0x80000000000024L),
new Long(0x7ffffffffffffL), new Long(0x8000000000001L)
}).iterator());
// the same with no range splitting
assertLongRangeSplit(-5000L, 9500L, 64, true, Arrays.asList(new Long[]{
new Long(0x7fffffffffffec78L),new Long(0x800000000000251cL)
}).iterator());
// this tests optimized range splitting, if one of the inner bounds
// is also the bound of the next lower precision, it should be used completely
assertLongRangeSplit(0L, 1024L+63L, 4, true, Arrays.asList(new Long[]{
new Long(0x800000000000040L), new Long(0x800000000000043L),
new Long(0x80000000000000L), new Long(0x80000000000003L)
}).iterator());
// the full long range should only consist of a lowest precision range; no bitset testing here, as too much memory needed :-)
assertLongRangeSplit(Long.MIN_VALUE, Long.MAX_VALUE, 8, false, Arrays.asList(new Long[]{
new Long(0x00L),new Long(0xffL)
}).iterator());
// the same with precisionStep=4
assertLongRangeSplit(Long.MIN_VALUE, Long.MAX_VALUE, 4, false, Arrays.asList(new Long[]{
new Long(0x0L),new Long(0xfL)
}).iterator());
// the same with precisionStep=2
assertLongRangeSplit(Long.MIN_VALUE, Long.MAX_VALUE, 2, false, Arrays.asList(new Long[]{
new Long(0x0L),new Long(0x3L)
}).iterator());
// the same with precisionStep=1
assertLongRangeSplit(Long.MIN_VALUE, Long.MAX_VALUE, 1, false, Arrays.asList(new Long[]{
new Long(0x0L),new Long(0x1L)
}).iterator());
// a inverse range should produce no sub-ranges
assertLongRangeSplit(9500L, -5000L, 4, false, Collections.EMPTY_LIST.iterator());
// a 0-length range should reproduce the range itsself
assertLongRangeSplit(9500L, 9500L, 4, false, Arrays.asList(new Long[]{
new Long(0x800000000000251cL),new Long(0x800000000000251cL)
}).iterator());
}
/** Note: The neededBounds iterator must be unsigned (easier understanding what's happening) */
protected void assertIntRangeSplit(final int lower, final int upper, int precisionStep,
final boolean useBitSet, final Iterator neededBounds
) throws Exception {
final OpenBitSet bits=useBitSet ? new OpenBitSet(upper-lower+1) : null;
NumericUtils.splitIntRange(new NumericUtils.IntRangeBuilder() {
//@Override
public void addRange(int min, int max, int shift) {
assertTrue("min, max should be inside bounds", min>=lower && min<=upper && max>=lower && max<=upper);
if (useBitSet) for (int i=min; i<=max; i++) {
assertFalse("ranges should not overlap", bits.getAndSet(i-lower) );
}
// make unsigned ints for easier display and understanding
min ^= 0x80000000;
max ^= 0x80000000;
//System.out.println("new Integer(0x"+Integer.toHexString(min>>>shift)+"),new Integer(0x"+Integer.toHexString(max>>>shift)+"),");
assertEquals( "inner min bound", ((Integer)neededBounds.next()).intValue(), min>>>shift);
assertEquals( "inner max bound", ((Integer)neededBounds.next()).intValue(), max>>>shift);
}
}, precisionStep, lower, upper);
if (useBitSet) {
// after flipping all bits in the range, the cardinality should be zero
bits.flip(0,upper-lower+1);
assertTrue("The sub-range concenated should match the whole range", bits.isEmpty());
}
}
public void testSplitIntRange() throws Exception {
// a hard-coded "standard" range
assertIntRangeSplit(-5000, 9500, 4, true, Arrays.asList(new Integer[]{
new Integer(0x7fffec78),new Integer(0x7fffec7f),
new Integer(0x80002510),new Integer(0x8000251c),
new Integer(0x7fffec8), new Integer(0x7fffecf),
new Integer(0x8000250), new Integer(0x8000250),
new Integer(0x7fffed), new Integer(0x7fffef),
new Integer(0x800020), new Integer(0x800024),
new Integer(0x7ffff), new Integer(0x80001)
}).iterator());
// the same with no range splitting
assertIntRangeSplit(-5000, 9500, 32, true, Arrays.asList(new Integer[]{
new Integer(0x7fffec78),new Integer(0x8000251c)
}).iterator());
// this tests optimized range splitting, if one of the inner bounds
// is also the bound of the next lower precision, it should be used completely
assertIntRangeSplit(0, 1024+63, 4, true, Arrays.asList(new Integer[]{
new Integer(0x8000040), new Integer(0x8000043),
new Integer(0x800000), new Integer(0x800003)
}).iterator());
// the full int range should only consist of a lowest precision range; no bitset testing here, as too much memory needed :-)
assertIntRangeSplit(Integer.MIN_VALUE, Integer.MAX_VALUE, 8, false, Arrays.asList(new Integer[]{
new Integer(0x00),new Integer(0xff)
}).iterator());
// the same with precisionStep=4
assertIntRangeSplit(Integer.MIN_VALUE, Integer.MAX_VALUE, 4, false, Arrays.asList(new Integer[]{
new Integer(0x0),new Integer(0xf)
}).iterator());
// the same with precisionStep=2
assertIntRangeSplit(Integer.MIN_VALUE, Integer.MAX_VALUE, 2, false, Arrays.asList(new Integer[]{
new Integer(0x0),new Integer(0x3)
}).iterator());
// the same with precisionStep=1
assertIntRangeSplit(Integer.MIN_VALUE, Integer.MAX_VALUE, 1, false, Arrays.asList(new Integer[]{
new Integer(0x0),new Integer(0x1)
}).iterator());
// a inverse range should produce no sub-ranges
assertIntRangeSplit(9500, -5000, 4, false, Collections.EMPTY_LIST.iterator());
// a 0-length range should reproduce the range itsself
assertIntRangeSplit(9500, 9500, 4, false, Arrays.asList(new Integer[]{
new Integer(0x8000251c),new Integer(0x8000251c)
}).iterator());
}
}