| /* |
| * 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.lucene.util.packed; |
| |
| import org.apache.lucene.util.packed.PackedInts.Mutable; |
| |
| /** |
| * A {@link PagedGrowableWriter}. This class slices data into fixed-size blocks |
| * which have independent numbers of bits per value and grow on-demand. |
| * <p>You should use this class instead of the {@link PackedLongValues} related ones only when |
| * you need random write-access. Otherwise this class will likely be slower and |
| * less memory-efficient. |
| * @lucene.internal |
| */ |
| public final class PagedGrowableWriter extends AbstractPagedMutable<PagedGrowableWriter> { |
| |
| final float acceptableOverheadRatio; |
| |
| /** |
| * Create a new {@link PagedGrowableWriter} instance. |
| * |
| * @param size the number of values to store. |
| * @param pageSize the number of values per page |
| * @param startBitsPerValue the initial number of bits per value |
| * @param acceptableOverheadRatio an acceptable overhead ratio |
| */ |
| public PagedGrowableWriter(long size, int pageSize, |
| int startBitsPerValue, float acceptableOverheadRatio) { |
| this(size, pageSize, startBitsPerValue, acceptableOverheadRatio, true); |
| } |
| |
| PagedGrowableWriter(long size, int pageSize,int startBitsPerValue, float acceptableOverheadRatio, boolean fillPages) { |
| super(startBitsPerValue, size, pageSize); |
| this.acceptableOverheadRatio = acceptableOverheadRatio; |
| if (fillPages) { |
| fillPages(); |
| } |
| } |
| |
| @Override |
| protected Mutable newMutable(int valueCount, int bitsPerValue) { |
| return new GrowableWriter(bitsPerValue, valueCount, acceptableOverheadRatio); |
| } |
| |
| @Override |
| protected PagedGrowableWriter newUnfilledCopy(long newSize) { |
| return new PagedGrowableWriter(newSize, pageSize(), bitsPerValue, acceptableOverheadRatio, false); |
| } |
| |
| @Override |
| protected long baseRamBytesUsed() { |
| return super.baseRamBytesUsed() + Float.BYTES; |
| } |
| |
| } |