Here you can find the source of truncateI(long[] v, int len)
| Parameter | Description |
|---|---|
| v | String to process |
| len | Length (in bits) to truncate to |
public static long[] truncateI(long[] v, int len)
//package com.java2s; /*// www. jav a 2 s. c o m This file is part of ELKI: Environment for Developing KDD-Applications Supported by Index-Structures Copyright (C) 2015 Ludwig-Maximilians-Universit?t M?nchen Lehr- und Forschungseinheit f?r Datenbanksysteme ELKI Development Team This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.util.Arrays; public class Main { /** * Shift factor for a long: 2^6 == 64 == Long.SIZE */ private static final int LONG_LOG2_SIZE = 6; /** Masking for long shifts. */ private static final int LONG_LOG2_MASK = 0x3f; /** Long with all bits set */ private static final long LONG_ALL_BITS = -1L; /** * Truncate a bit string to the given length (setting any higher bit to 0). * * @param v String to process * @param len Length (in bits) to truncate to */ public static long[] truncateI(long[] v, int len) { final int zap = (v.length * Long.SIZE) - len; final int zapWords = (zap >>> LONG_LOG2_SIZE); final int zapbits = zap & LONG_LOG2_MASK; Arrays.fill(v, v.length - zapWords, v.length, 0); if (zapbits > 0) { v[v.length - zapWords - 1] &= (LONG_ALL_BITS >>> zapbits); } return v; } }