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-rw-r--r--src/java/com/jogamp/common/util/IntBitfield.java71
1 files changed, 71 insertions, 0 deletions
diff --git a/src/java/com/jogamp/common/util/IntBitfield.java b/src/java/com/jogamp/common/util/IntBitfield.java
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+++ b/src/java/com/jogamp/common/util/IntBitfield.java
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+/**
+ * Copyright 2012 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ * of conditions and the following disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+package com.jogamp.common.util;
+
+public class IntBitfield {
+ /** Unit size in bits, here 32 bits for one int unit. */
+ public static final int UNIT_SIZE = 32;
+
+ final int[] storage;
+ final long bits;
+
+ /**
+ * @param bits
+ */
+ public IntBitfield(long bits) {
+ final int units = (int) ( ( bits + 7L ) / (long)UNIT_SIZE );
+ this.storage = new int[units];
+ this.bits = units * (long)UNIT_SIZE;
+ }
+
+ private final void check(long bitnum) {
+ if( 0 > bitnum || bitnum >= bits ) {
+ throw new ArrayIndexOutOfBoundsException("Bitnum should be within [0.."+(bits-1)+"], but is "+bitnum);
+ }
+ }
+
+ public final long capacity() { return bits; }
+
+ public final boolean get(long bitnum) {
+ check(bitnum);
+ final int u = (int) ( bitnum / UNIT_SIZE );
+ final int b = (int) ( bitnum - ( u * UNIT_SIZE ) );
+ return 0 != ( storage[u] & ( 1 << b ) ) ;
+ }
+
+ public final void put(long bitnum, boolean bit) {
+ check(bitnum);
+ final int u = (int) ( bitnum / UNIT_SIZE );
+ final int b = (int) ( bitnum - ( u * UNIT_SIZE ) );
+ if(bit) {
+ storage[u] |= 1 << b;
+ } else {
+ storage[u] &= ~( 1 << b );
+ }
+ }
+}