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classlib: add BitSet stream API (#674)

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This commit is contained in:
Ivan Hetman 2023-03-15 12:09:49 +02:00 committed by GitHub
parent ca76ea45cf
commit ffe3f34731
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2 changed files with 46 additions and 1 deletions
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28
classlib/src/main/java/org/teavm/classlib/java/util/TBitSet.java
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@ -15,8 +15,11 @@
*/
package org.teavm.classlib.java.util;
import java.util.function.IntPredicate;
import org.teavm.classlib.java.io.TSerializable;
import org.teavm.classlib.java.lang.*;
import org.teavm.classlib.java.util.stream.TIntStream;
import org.teavm.classlib.java.util.stream.intimpl.TSimpleIntStreamImpl;
import org.teavm.interop.Rename;
public class TBitSet extends TObject implements TCloneable, TSerializable {
@ -40,7 +43,7 @@ public class TBitSet extends TObject implements TCloneable, TSerializable {
public static TBitSet valueOf(long[] longs) {
int[] ints = new int[longs.length * 2];
for (int i = 0; i < longs.length; ++i) {
ints[i * 2 + 1] = (int) longs[i];
ints[i * 2] = (int) longs[i];
ints[i * 2 + 1] = (int) (longs[i] >>> TInteger.SIZE);
}
return new TBitSet(ints);
@ -511,6 +514,29 @@ public class TBitSet extends TObject implements TCloneable, TSerializable {
return sb.toString();
}
public TIntStream stream() {
return new BitSetStream();
}
private class BitSetStream extends TSimpleIntStreamImpl {
private int current;
private BitSetStream() {
this.current = nextSetBit(0);
}
@Override
public boolean next(IntPredicate consumer) {
while (current >= 0) {
if (!consumer.test(current)) {
return true;
}
current = nextSetBit(current + 1);
}
return false;
}
}
@Rename("clone")
public TObject clone0() {
return new TBitSet(TArrays.copyOf(data, data.length));

19
tests/src/test/java/org/teavm/classlib/java/util/BitSetTest.java
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@ -47,6 +47,7 @@
*/
package org.teavm.classlib.java.util;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
@ -98,6 +99,24 @@ public class BitSetTest {
}
}
@Test
public void constructFromLongs() {
BitSet bs = BitSet.valueOf(new long[] { 7, 2, 5, 1L << 36 });
assertTrue(bs.get(0) && bs.get(1) && bs.get(2) && bs.get(Long.SIZE + 1)
&& bs.get(2 * Long.SIZE) && bs.get(2 * Long.SIZE + 2) && bs.get(3 * Long.SIZE + 36));
assertFalse(bs.get(3) || bs.get(Long.SIZE + 6) || bs.get(2 * Long.SIZE + 15) || bs.get(3 * Long.SIZE));
}
@Test
public void testStream() {
assertArrayEquals(new int[] { 0, 1, 2, Long.SIZE + 1, 2 * Long.SIZE, 2 * Long.SIZE + 2, 3 * Long.SIZE + 36 },
BitSet.valueOf(new long[] { 7, 2, 5, 1L << 36 }).stream().toArray());
BitSet bs = new BitSet();
assertEquals(0, bs.stream().count());
bs.set(1);
assertArrayEquals(new int[] { 1 }, bs.stream().toArray());
}
@Test
public void clonePerformed() {
BitSet bs;