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Java example source code file (MathUtil.java)
The MathUtil.java Java example source code/* * Copyright 2015 The Netty Project * * The Netty Project licenses this file to you 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 io.netty.util.internal; /** * Math utility methods. */ public final class MathUtil { private MathUtil() { } /** * Fast method of finding the next power of 2 greater than or equal to the supplied value. * * If the value is {@code <= 0} then 1 will be returned. * This method is not suitable for {@link Integer#MIN_VALUE} or numbers greater than 2^30. * * @param value from which to search for next power of 2 * @return The next power of 2 or the value itself if it is a power of 2 */ public static int findNextPositivePowerOfTwo(final int value) { assert value > Integer.MIN_VALUE && value < 0x40000000; return 1 << (32 - Integer.numberOfLeadingZeros(value - 1)); } /** * Determine if the requested {@code index} and {@code length} will fit within {@code capacity}. * @param index The starting index. * @param length The length which will be utilized (starting from {@code index}). * @param capacity The capacity that {@code index + length} is allowed to be within. * @return {@code true} if the requested {@code index} and {@code length} will fit within {@code capacity}. * {@code false} if this would result in an index out of bounds exception. */ public static boolean isOutOfBounds(int index, int length, int capacity) { return (index | length | (index + length) | (capacity - (index + length))) < 0; } /** * Compare to {@code long} values. * @param x the first {@code long} to compare. * @param y the second {@code long} to compare. * @return * <ul> * <li>0 if {@code x == y} * <li>{@code > 0} if {@code x > y} * <li>{@code < 0} if {@code x < y} * </ul> */ public static int compare(long x, long y) { return (x < y) ? -1 : (x > y) ? 1 : 0; } } Other Java examples (source code examples)Here is a short list of links related to this Java MathUtil.java source code file: |
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