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// (C) 1996 Glynn Clements <glynn@sensei.co.uk> - Freely Redistributable
// Modified 1998/7/18 by Charles Briscoe-Smith:
// ensureSize: copy data.length items, not words
package JLex;
final class JavaLexBitSet extends Object implements Cloneable
{
// Fields
protected long[] data;
// Private Methods
private void ensureSize(int words)
{
if (words <= data.length)
return;
long[] newData = new long[words];
System.arraycopy(
(Object) data, 0,
(Object) newData, 0,
data.length
);
data = newData;
}
// Public Methods
public boolean get(int bit)
{
int d = bit >> 6;
if (d >= data.length)
return false;
int r = bit & 0x3F;
return (data[d] & (1L << r)) != 0L;
}
public void clear(int bit)
{
int d = bit >> 6;
int r = bit & 0x3F;
ensureSize(d + 1);
data[d] &= ~(1L << r);
}
public void set(int bit)
{
int d = bit >> 6;
int r = bit & 0x3F;
ensureSize(d + 1);
data[d] |= (1L << r);
}
public void and(JavaLexBitSet set)
{
ensureSize(set.data.length);
for (int i = 0; i < set.data.length; i++)
data[i] &= set.data[i];
for (int i = set.data.length; i < data.length; i++)
data[i] = 0L;
}
public void or(JavaLexBitSet set)
{
ensureSize(set.data.length);
for (int i = 0; i < set.data.length; i++)
data[i] |= set.data[i];
}
public void xor(JavaLexBitSet set)
{
ensureSize(set.data.length);
for (int i = 0; i < set.data.length; i++)
data[i] ^= set.data[i];
}
public Object clone()
{
JavaLexBitSet set;
try
{
set = (JavaLexBitSet)(super.clone());
}
catch (CloneNotSupportedException e)
{
return null;
}
set.data = new long[data.length];
System.arraycopy(
(Object) data, 0,
(Object) set.data, 0,
data.length
);
return set;
}
public boolean equals(Object obj)
{
if (obj == null)
return false;
JavaLexBitSet set;
try
{
set = (JavaLexBitSet) obj;
}
catch (ClassCastException e)
{
return false;
}
int i;
for (i = 0; i < Math.min(data.length, set.data.length); i++)
if (data[i] != set.data[i])
return false;
if (set.data.length > data.length)
for ( ; i < set.data.length; i++)
if (set.data[i] != 0L)
return false;
else
for ( ; i < data.length; i++)
if (data[i] != 0L)
return false;
return true;
}
public int size()
{
return data.length * 64;
}
public final String toString()
{
StringBuffer buff = new StringBuffer("{");
int n = 0;
for (int i = 0; i < data.length; i++)
{
long word = data[i];
for (int j = 0; j < 64; j++, n++, word >>= 1)
{
if ((word & 1) == 0)
continue;
if (n > 0)
buff.append(", ");
buff.append(Integer.toString(n));
}
}
buff.append("}");
return buff.toString();
}
public synchronized int hashCode()
{
// from 'The Java Language Specification', p620
long h = 1234;
for (int i = 0; i < data.length; i++)
h ^= data[i] * (i + 1);
return (int)((h >> 32) ^ h);
}
// Constructors
public JavaLexBitSet(int nbits)
{
data = new long[(nbits + 63) / 64];
}
public JavaLexBitSet()
{
this(64);
}
}
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