Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / schema / BitSet.cs / 1 / BitSet.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace System.Xml.Schema { using System.Text; using System.Diagnostics; internal sealed class BitSet { private const int bitSlotShift = 5; private const int bitSlotMask = (1 << bitSlotShift) - 1; private int count; private uint[] bits; private BitSet() { } public BitSet(int count) { this.count = count; bits = new uint[Subscript(count + bitSlotMask)]; } public int Count { get { return count; } } public bool this[int index] { get { return Get(index); } } public void Clear() { int bitsLength = bits.Length; for (int i = bitsLength; i-- > 0 ;) { bits[i] = 0; } } public void Clear(int index) { int nBitSlot = Subscript(index); EnsureLength(nBitSlot + 1); bits[nBitSlot] &= ~((uint)1 << (index & bitSlotMask)); } public void Set(int index) { int nBitSlot = Subscript(index); EnsureLength(nBitSlot + 1); bits[nBitSlot] |= (uint)1 << (index & bitSlotMask); } public bool Get(int index) { bool fResult = false; if (index < count) { int nBitSlot = Subscript(index); fResult = ((bits[nBitSlot] & (1 << (index & bitSlotMask))) != 0); } return fResult; } public int NextSet(int startFrom) { Debug.Assert(startFrom >= -1 && startFrom <= count); int offset = startFrom + 1; if (offset == count) { return -1; } int nBitSlot = Subscript(offset); offset &= bitSlotMask; uint word = bits[nBitSlot] >> offset; // locate non-empty slot while (word == 0) { if ((++ nBitSlot) == bits.Length ) { return -1; } offset = 0; word = bits[nBitSlot]; } while ((word & (uint)1) == 0) { word >>= 1; offset ++; } return (nBitSlot << bitSlotShift) + offset; } public void And(BitSet other) { /* * Need to synchronize both this and other-> * This might lead to deadlock if one thread grabs them in one order * while another thread grabs them the other order. * Use a trick from Doug Lea's book on concurrency, * somewhat complicated because BitSet overrides hashCode(). */ if (this == other) { return; } int bitsLength = bits.Length; int setLength = other.bits.Length; int n = (bitsLength > setLength) ? setLength : bitsLength; for (int i = n ; i-- > 0 ;) { bits[i] &= other.bits[i]; } for (; n < bitsLength ; n++) { bits[n] = 0; } } public void Or(BitSet other) { if (this == other) { return; } int setLength = other.bits.Length; EnsureLength(setLength); for (int i = setLength; i-- > 0 ;) { bits[i] |= other.bits[i]; } } public override int GetHashCode() { int h = 1234; for (int i = bits.Length; --i >= 0;) { h ^= (int)bits[i] * (i + 1); } return(int)((h >> 32) ^ h); } public override bool Equals(object obj) { // assume the same type if (obj != null) { if (this == obj) { return true; } BitSet other = (BitSet) obj; int bitsLength = bits.Length; int setLength = other.bits.Length; int n = (bitsLength > setLength) ? setLength : bitsLength; for (int i = n ; i-- > 0 ;) { if (bits[i] != other.bits[i]) { return false; } } if (bitsLength > n) { for (int i = bitsLength ; i-- > n ;) { if (bits[i] != 0) { return false; } } } else { for (int i = setLength ; i-- > n ;) { if (other.bits[i] != 0) { return false; } } } return true; } return false; } public BitSet Clone() { BitSet newset = new BitSet(); newset.count = count; newset.bits = (uint[])bits.Clone(); return newset; } public bool IsEmpty { get { uint k = 0; for (int i = 0; i < bits.Length; i++) { k |= bits[i]; } return k == 0; } } public bool Intersects(BitSet other) { int i = Math.Min(this.bits.Length, other.bits.Length); while (--i >= 0) { if ((this.bits[i] & other.bits[i]) != 0) { return true; } } return false; } private int Subscript(int bitIndex) { return bitIndex >> bitSlotShift; } private void EnsureLength(int nRequiredLength) { /* Doesn't need to be synchronized because it's an internal method. */ if (nRequiredLength > bits.Length) { /* Ask for larger of doubled size or required size */ int request = 2 * bits.Length; if (request < nRequiredLength) request = nRequiredLength; uint[] newBits = new uint[request]; Array.Copy(bits, newBits, bits.Length); bits = newBits; } } #if DEBUG public void Dump(StringBuilder bb) { for (int i = 0; i < count; i ++) { bb.Append( Get(i) ? "1" : "0"); } } #endif }; } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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