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Add changes to build star tree in off heap (#14817)
--------- Signed-off-by: Bharathwaj G <[email protected]>
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server/src/main/java/org/opensearch/common/util/ByteArrayBackedBitset.java
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/* | ||
* SPDX-License-Identifier: Apache-2.0 | ||
* | ||
* The OpenSearch Contributors require contributions made to | ||
* this file be licensed under the Apache-2.0 license or a | ||
* compatible open source license. | ||
*/ | ||
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package org.opensearch.common.util; | ||
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import org.apache.lucene.store.IndexInput; | ||
import org.apache.lucene.store.IndexOutput; | ||
import org.apache.lucene.store.RandomAccessInput; | ||
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import java.io.IOException; | ||
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/** | ||
* A bitset backed by a byte array. This will initialize and set bits in the byte array based on the index. | ||
*/ | ||
public class ByteArrayBackedBitset { | ||
private final byte[] byteArray; | ||
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/** | ||
* Constructor which uses an on heap list. This should be using during construction of the bitset. | ||
*/ | ||
public ByteArrayBackedBitset(int capacity) { | ||
byteArray = new byte[capacity]; | ||
} | ||
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/** | ||
* Constructor which set the Lucene's RandomAccessInput to read the bitset into a read-only buffer. | ||
*/ | ||
public ByteArrayBackedBitset(RandomAccessInput in, long offset, int length) throws IOException { | ||
byteArray = new byte[length]; | ||
int i = 0; | ||
while (i < length) { | ||
byteArray[i] = in.readByte(offset + i); | ||
i++; | ||
} | ||
} | ||
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/** | ||
* Constructor which set the Lucene's IndexInput to read the bitset into a read-only buffer. | ||
*/ | ||
public ByteArrayBackedBitset(IndexInput in, int length) throws IOException { | ||
byteArray = new byte[length]; | ||
int i = 0; | ||
while (i < length) { | ||
byteArray[i] = in.readByte(); | ||
i++; | ||
} | ||
} | ||
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/** | ||
* Sets the bit at the given index to 1. | ||
* Each byte can indicate 8 bits, so the index is divided by 8 to get the byte array index. | ||
* @param index the index to set the bit | ||
*/ | ||
public void set(int index) { | ||
int byteArrIndex = index >> 3; | ||
byteArray[byteArrIndex] |= (byte) (1 << (index & 7)); | ||
} | ||
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public int write(IndexOutput output) throws IOException { | ||
int numBytes = 0; | ||
for (Byte bitSet : byteArray) { | ||
output.writeByte(bitSet); | ||
numBytes += Byte.BYTES; | ||
} | ||
return numBytes; | ||
} | ||
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/** | ||
* Retrieves whether the bit is set or not at the given index. | ||
* @param index the index to look up for the bit | ||
* @return true if bit is set, false otherwise | ||
*/ | ||
public boolean get(int index) throws IOException { | ||
int byteArrIndex = index >> 3; | ||
return (byteArray[byteArrIndex] & (1 << (index & 7))) != 0; | ||
} | ||
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public int getCurrBytesRead() { | ||
return byteArray.length; | ||
} | ||
} |
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