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116 changes: 116 additions & 0 deletions
116
common/sketch/src/main/java/org/apache/spark/util/sketch/BitArray.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| /* | ||
| * 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.spark.util.sketch; | ||
|
|
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| import java.io.DataInputStream; | ||
| import java.io.DataOutputStream; | ||
| import java.io.IOException; | ||
| import java.util.Arrays; | ||
|
|
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| public final class BitArray { | ||
| private final long[] data; | ||
| private long bitCount; | ||
|
|
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| static int numWords(long numBits) { | ||
| if (numBits <= 0) { | ||
| throw new IllegalArgumentException("numBits must be positive, but got " + numBits); | ||
| } | ||
| long numWords = (long) Math.ceil(numBits / 64.0); | ||
| if (numWords > Integer.MAX_VALUE) { | ||
| throw new IllegalArgumentException("Can't allocate enough space for " + numBits + " bits"); | ||
| } | ||
| return (int) numWords; | ||
| } | ||
|
|
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| BitArray(long numBits) { | ||
| this(new long[numWords(numBits)]); | ||
| } | ||
|
|
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| private BitArray(long[] data) { | ||
| this.data = data; | ||
| long bitCount = 0; | ||
| for (long word : data) { | ||
| bitCount += Long.bitCount(word); | ||
| } | ||
| this.bitCount = bitCount; | ||
| } | ||
|
|
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| /** Returns true if the bit changed value. */ | ||
| boolean set(long index) { | ||
| if (!get(index)) { | ||
| data[(int) (index >>> 6)] |= (1L << index); | ||
| bitCount++; | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
|
|
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| boolean get(long index) { | ||
| return (data[(int) (index >>> 6)] & (1L << index)) != 0; | ||
| } | ||
|
|
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| /** Number of bits */ | ||
| long bitSize() { | ||
| return (long) data.length * Long.SIZE; | ||
| } | ||
|
|
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| /** Number of set bits (1s) */ | ||
| long cardinality() { | ||
| return bitCount; | ||
| } | ||
|
|
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| /** Combines the two BitArrays using bitwise OR. */ | ||
| void putAll(BitArray array) { | ||
| assert data.length == array.data.length : "BitArrays must be of equal length when merging"; | ||
| long bitCount = 0; | ||
| for (int i = 0; i < data.length; i++) { | ||
| data[i] |= array.data[i]; | ||
| bitCount += Long.bitCount(data[i]); | ||
| } | ||
| this.bitCount = bitCount; | ||
| } | ||
|
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| void writeTo(DataOutputStream out) throws IOException { | ||
| out.writeInt(data.length); | ||
| for (long datum : data) { | ||
| out.writeLong(datum); | ||
| } | ||
| } | ||
|
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| static BitArray readFrom(DataInputStream in) throws IOException { | ||
| int numWords = in.readInt(); | ||
| long[] data = new long[numWords]; | ||
| for (int i = 0; i < numWords; i++) { | ||
| data[i] = in.readLong(); | ||
| } | ||
| return new BitArray(data); | ||
| } | ||
|
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| @Override | ||
| public boolean equals(Object other) { | ||
| if (this == other) return true; | ||
| if (other == null || !(other instanceof BitArray)) return false; | ||
| BitArray that = (BitArray) other; | ||
| return Arrays.equals(data, that.data); | ||
| } | ||
|
|
||
| @Override | ||
| public int hashCode() { | ||
| return Arrays.hashCode(data); | ||
| } | ||
| } |
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