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Adds java.util.BitSet implementation

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konsoletyper 2014-03-21 01:42:35 +04:00
parent 5fd2b18eba
commit ff7f50d911
2 changed files with 1661 additions and 0 deletions
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239
teavm-classlib/src/main/java/org/teavm/classlib/java/util/TBitSet.java Normal file
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/*
* Copyright 2014 Alexey Andreev.
*
* Licensed 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.teavm.classlib.java.util;
import org.teavm.classlib.java.io.TSerializable;
import org.teavm.classlib.java.lang.*;
/**
*
* @author Alexey Andreev <konsoletyper@gmail.com>
*/
public class TBitSet extends TObject implements TCloneable, TSerializable {
private int[] data;
private int length;
private TBitSet(int[] data) {
this.data = data;
length = data.length * Integer.SIZE;
recalculateLength();
}
public TBitSet() {
data = new int[0];
}
public TBitSet(int nbits) {
data = new int[TMath.max(1, (nbits + TInteger.SIZE - 1) / TInteger.SIZE)];
}
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 + 1] = (int)(longs[i] >>> TInteger.SIZE);
}
return new TBitSet(ints);
}
public static TBitSet valueOf(byte[] bytes) {
int[] ints = new int[(bytes.length + 3) / 4];
int fullInts = bytes.length / 4;
for (int i = 0; i < fullInts; ++i) {
ints[i] = bytes[i * 4] | (bytes[i * 4 + 1] << 8) | (bytes[i * 4 + 2] << 16) | (bytes[i * 4 + 3] << 24);
}
int lastInt = ints.length - 1;
int lastByte = bytes[lastInt * 4];
switch (bytes.length % 4) {
case 3:
ints[lastInt] = bytes[lastByte] | (bytes[lastByte + 1] << 8) | (bytes[lastByte + 2] << 16);
break;
case 2:
ints[lastInt] = bytes[lastByte] | (bytes[lastByte + 1] << 8);
break;
case 1:
ints[lastInt] = bytes[lastByte];
break;
}
return new TBitSet(ints);
}
public byte[] toByteArray() {
byte[] bytes = new byte[(length + 7) / 8];
int fullInts = length / TInteger.SIZE;
int j = 0;
int i = 0;
for (; i < fullInts; i += 4) {
bytes[j++] = (byte)data[i];
bytes[j++] = (byte)(data[i] >>> 8);
bytes[j++] = (byte)(data[i] >>> 16);
bytes[j++] = (byte)(data[i] >>> 24);
}
switch (bytes.length % 4) {
case 3:
bytes[j++] = (byte)data[i];
bytes[j++] = (byte)(data[i] >>> 8);
bytes[j++] = (byte)(data[i] >>> 16);
break;
case 2:
bytes[j++] = (byte)data[i];
bytes[j++] = (byte)(data[i] >>> 8);
break;
case 1:
bytes[j++] = (byte)data[i];
break;
}
return bytes;
}
public long[] toLongArray() {
long[] longs = new long[(length + 63) / 64];
int fullLongs = length / 64;
int i = 0;
for (; i < fullLongs; ++i) {
longs[i] = data[i * 2] | (data[i * 2 + 1] << 32);
}
if ((length / 32) % 2 == 1) {
longs[i] = data[i * 2];
}
return longs;
}
public void flip(int bitIndex) {
if (get(bitIndex)) {
clear(bitIndex);
} else {
set(bitIndex);
}
}
public void set(int bitIndex) {
int index = bitIndex / 32;
if (bitIndex >= length) {
ensureCapacity(index + 1);
length = bitIndex + 1;
}
data[index] |= 1 << (bitIndex % 32);
}
public void set(int bitIndex, boolean value) {
if (value) {
set(bitIndex);
} else {
clear(bitIndex);
}
}
public void set(int fromIndex, int toIndex) {
if (fromIndex > toIndex) {
throw new TIndexOutOfBoundsException();
}
int fromDataIndex = fromIndex / 32;
int toDataIndex = toIndex / 32;
if (toIndex > length) {
ensureCapacity(toDataIndex + 1);
length = toIndex;
}
if (fromDataIndex == toDataIndex) {
data[fromDataIndex] |= (0xFFFFFFFF << (fromIndex % 32)) & (0xFFFFFFFF >>> (32 - toIndex % 32));
} else {
data[fromDataIndex] |= 0xFFFFFFFF << (fromIndex % 32);
for (int i = fromDataIndex + 1; i < toDataIndex; ++i) {
data[i] = 0xFFFFFFFF;
}
data[toDataIndex] |= 0xFFFFFFFF >>> (32 - toIndex % 32);
}
}
public void set(int fromIndex, int toIndex, boolean value) {
if (value) {
set(fromIndex, toIndex);
} else {
clear(fromIndex, toIndex);
}
}
public void clear(int bitIndex) {
int index = bitIndex / 32;
if (index < data.length) {
data[index] &= TInteger.rotateLeft(bitIndex, 0xFFFFFFFE);
recalculateLength();
}
}
public void clear(int fromIndex, int toIndex) {
if (fromIndex > toIndex) {
throw new TIndexOutOfBoundsException();
}
if (fromIndex >= length) {
return;
}
toIndex = TMath.min(length, toIndex);
int fromDataIndex = fromIndex / 32;
int toDataIndex = toIndex / 32;
if (fromDataIndex == toDataIndex) {
data[fromDataIndex] &= (0xFFFFFFFF >>> (32 - fromIndex % 32)) | (0xFFFFFFFF << (toIndex % 32));
} else {
data[fromDataIndex] &= 0xFFFFFFFF >>> (32 - fromIndex % 32);
for (int i = fromDataIndex + 1; i < toDataIndex; ++i) {
data[i] = 0;
}
data[toDataIndex] &= 0xFFFFFFFF << (toIndex % 32);
}
recalculateLength();
}
public boolean get(int bitIndex) {
int index = bitIndex / 32;
return index < data.length && (data[index] & (1 << (bitIndex % 32))) != 0;
}
public void clear() {
length = 0;
TArrays.fill(data, 0);
}
private void ensureCapacity(int capacity) {
if (data.length >= capacity) {
return;
}
int newArrayLength = TMath.max(capacity * 3 / 2, data.length * 2 + 1);
data = TArrays.copyOf(data, newArrayLength);
}
private void recalculateLength() {
length = (1 + length / 32) * 32;
for (int i = data.length - 1; i >= 0; --i, length -= TInteger.SIZE) {
int sz = TInteger.numberOfLeadingZeros(data[i]);
if (sz < TInteger.SIZE) {
length -= sz;
break;
}
}
}
public int length() {
return length;
}
public boolean isEmpty() {
return length == 0;
}
public int size() {
return data.length * 32;
}
}

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teavm-classlib/src/test/java/org/teavm/classlib/java/util/BitSetTest.java Normal file
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