25 lines
915 B
Java
25 lines
915 B
Java
package com.comphenix.protocol.utility;
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public final class IntegerMath
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{
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// The largest positive int in java is 2^31 - 1, so 2^30 is the largest positive int that is a power of 2.
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public static final int MAX_SIGNED_POWER_OF_TWO = 1 << (Integer.SIZE - 2);
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private IntegerMath() {}
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/**
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* This calculates the smallest y for which 2^y > x
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*
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* @param x the number that the next power of 2 should be calculated for.
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*
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* @return If the next power of two would be larger than {@link #MAX_SIGNED_POWER_OF_TWO}, this method returns {@link Integer#MAX_VALUE}
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*
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* @see com.google.common.math.IntMath for a similar version, that is not yet implemented in the guava of Minecraft 1.8.
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*/
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public static int nextPowerOfTwo(int x)
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{
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if (x > MAX_SIGNED_POWER_OF_TWO) return Integer.MAX_VALUE;
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return 1 << -Integer.numberOfLeadingZeros(x - 1);
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}
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}
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