| /* |
| * Copyright 2000-2014 JetBrains s.r.o. |
| * |
| * 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 com.intellij.util.indexing.containers; |
| |
| import com.intellij.openapi.util.ThreadLocalCachedIntArray; |
| import com.intellij.util.indexing.ValueContainer; |
| |
| /** |
| * Created by Maxim.Mossienko on 6/12/2014. |
| */ |
| public class SortedFileIdSetIterator implements ValueContainer.IntIterator { |
| private final int[] myBits; |
| private final int myBitsLength; |
| private final int myOffset; |
| private int myPosition; |
| private final int mySize; |
| |
| private SortedFileIdSetIterator(int[] bits, int bitsLength, int offset, int size) { |
| myBits = bits; |
| myBitsLength = bitsLength; |
| myOffset = offset; |
| myPosition = nextSetBit(0, myBits, myBitsLength); |
| mySize = size; |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return myPosition != -1; |
| } |
| |
| @Override |
| public int next() { |
| int next = myPosition + myOffset; |
| myPosition = nextSetBit(myPosition + 1, myBits, myBitsLength); |
| return next; |
| } |
| |
| @Override |
| public int size() { |
| return mySize; |
| } |
| |
| @Override |
| public boolean hasAscendingOrder() { |
| return true; |
| } |
| |
| @Override |
| public ValueContainer.IntIterator createCopyInInitialState() { |
| return new SortedFileIdSetIterator(myBits, myBitsLength, myOffset, mySize); |
| } |
| |
| public static ValueContainer.IntIterator getTransientIterator(ValueContainer.IntIterator intIterator) { |
| final ValueContainer.IntIterator intIteratorConed = intIterator.createCopyInInitialState(); |
| int max = 0, min = Integer.MAX_VALUE; |
| |
| while(intIterator.hasNext()) { |
| int nextInt = intIterator.next(); |
| max = Math.max(max, nextInt); |
| min = Math.min(min, nextInt); |
| } |
| |
| assert min > 0; |
| |
| final int offset = (min >> INT_BITS_SHIFT) << INT_BITS_SHIFT; |
| final int bitsLength = ((max - offset) >> INT_BITS_SHIFT) + 1; |
| final int[] bits = ourSpareBuffer.getBuffer(bitsLength); |
| for(int i = 0; i < bitsLength; ++i) bits[i] = 0; |
| |
| intIterator = intIteratorConed; |
| int size = 0; |
| while(intIterator.hasNext()) { |
| final int id = intIterator.next() - offset; |
| bits[id >> INT_BITS_SHIFT] |= (1 << (id)); |
| ++size; |
| } |
| |
| return new SortedFileIdSetIterator(bits, bitsLength, offset, size); |
| } |
| |
| private static final ThreadLocalCachedIntArray ourSpareBuffer = new ThreadLocalCachedIntArray(); |
| |
| private static final int INT_BITS_SHIFT = 5; |
| private static int nextSetBit(int bitIndex, int[] bits, int bitsLength) { |
| int wordIndex = bitIndex >> INT_BITS_SHIFT; |
| if (wordIndex >= bitsLength) { |
| return -1; |
| } |
| |
| int word = bits[wordIndex] & (-1 << bitIndex); |
| |
| while (true) { |
| if (word != 0) { |
| return (wordIndex << INT_BITS_SHIFT) + Long.numberOfTrailingZeros(word); |
| } |
| if (++wordIndex == bitsLength) { |
| return -1; |
| } |
| word = bits[wordIndex]; |
| } |
| } |
| |
| } |