| /* |
| * 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.datasketches.filters.bloomfilter; |
| |
| import org.apache.datasketches.common.SketchesArgumentException; |
| import org.apache.datasketches.common.SketchesReadOnlyException; |
| import org.apache.datasketches.memory.Memory; |
| import org.apache.datasketches.memory.WritableMemory; |
| |
| /** |
| * This class can maintain the BitArray object off-heap. |
| */ |
| public class DirectBitArrayR extends BitArray { |
| final static protected long NUM_BITS_OFFSET = Long.BYTES; |
| final static protected long DATA_OFFSET = 2L * Long.BYTES; |
| |
| final protected int dataLength_; |
| final protected WritableMemory wmem_; // for inheritance; we won't write to it |
| protected long numBitsSet_; // could be final here but writable direct will update it |
| |
| protected DirectBitArrayR(final int dataLength, final long storedNumBitsSet, final Memory mem) { |
| super(); |
| |
| dataLength_ = dataLength; |
| wmem_ = (WritableMemory) mem; |
| |
| if (storedNumBitsSet == -1) { |
| numBitsSet_ = 0; |
| for (int i = 0; i < dataLength_; ++i) { |
| numBitsSet_ += Long.bitCount(wmem_.getLong(DATA_OFFSET + (i << 3))); |
| } |
| } else { |
| numBitsSet_ = storedNumBitsSet; |
| } |
| } |
| |
| // assumes we have a region with only the portion of Memory |
| // the BitArray cares about |
| static DirectBitArrayR wrap(final Memory mem, final boolean isEmpty) { |
| final int arrayLength = mem.getInt(0); |
| final long storedNumBitsSet = isEmpty ? 0L : mem.getLong(NUM_BITS_OFFSET); |
| |
| if (arrayLength < 0) { |
| throw new SketchesArgumentException("Possible corruption: Serialized image indicates non-positive array length"); |
| } |
| |
| // required capacity is arrayLength plus room for |
| // arrayLength (in longs) and numBitsSet |
| if (storedNumBitsSet != 0 && mem.getCapacity() < arrayLength + 2) { |
| throw new SketchesArgumentException("Memory capacity insufficient for Bloom Filter. Needed: " |
| + (arrayLength + 2) + " , found: " + mem.getCapacity()); |
| } |
| return new DirectBitArrayR(arrayLength, storedNumBitsSet, mem); |
| } |
| |
| @Override |
| long getCapacity() { |
| return (long) dataLength_ * Long.SIZE; |
| } |
| |
| @Override |
| long getNumBitsSet() { |
| return numBitsSet_; |
| } |
| |
| @Override |
| protected boolean isDirty() { |
| // read-only so necessarily false |
| return false; |
| } |
| |
| @Override |
| int getArrayLength() { |
| return dataLength_; |
| } |
| |
| @Override |
| boolean getBit(final long index) { |
| if (isEmpty()) { return false; } |
| return (wmem_.getByte(DATA_OFFSET + ((int) index >>> 3)) & (1 << (index & 0x7))) != 0; |
| } |
| |
| @Override |
| protected long getLong(final int arrayIndex) { |
| if (isEmpty()) { return 0L; } |
| return wmem_.getLong(DATA_OFFSET + (arrayIndex << 3)); |
| } |
| |
| @Override |
| public boolean hasMemory() { |
| return (wmem_ != null); |
| } |
| |
| @Override |
| public boolean isDirect() { |
| return (wmem_ != null) ? wmem_.isDirect() : false; |
| } |
| |
| @Override |
| public boolean isReadOnly() { |
| return true; |
| } |
| |
| @Override |
| void reset() { |
| throw new SketchesReadOnlyException("Attempt to call reset() on read-only memory"); |
| } |
| |
| @Override |
| void setBit(final long index) { |
| throw new SketchesReadOnlyException("Attempt to call setBit() on read-only memory"); |
| } |
| |
| @Override |
| boolean getAndSetBit(final long index) { |
| throw new SketchesReadOnlyException("Attempt to call getAndSetBit() on read-only memory"); |
| } |
| |
| @Override |
| void intersect(final BitArray other) { |
| throw new SketchesReadOnlyException("Attempt to call intersect() on read-only memory"); |
| } |
| |
| @Override |
| void union(final BitArray other) { |
| throw new SketchesReadOnlyException("Attempt to call union() on read-only memory"); |
| } |
| |
| @Override |
| void invert() { |
| throw new SketchesReadOnlyException("Attempt to call invert() on read-only memory"); |
| } |
| |
| @Override |
| protected void setLong(final int arrayIndex, final long value) { |
| throw new SketchesReadOnlyException("Attempt to call setLong() on read-only memory"); |
| } |
| } |