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/*
* The MIT License
*
* Copyright (c) 2016-2020 JOML
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.joml;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Arrays;
import java.util.Locale;
/**
* Utility class for reading system properties.
*
* @author Kai Burjack
*/
final class Options {
/**
* Whether certain debugging checks should be made, such as that only direct NIO Buffers are used when Unsafe is active,
* and a proxy should be created on calls to readOnlyView().
*/
public static final boolean DEBUG = hasOption(System.getProperty("joml.debug", "false"));
/**
* Whether not to use sun.misc.Unsafe when copying memory with MemUtil.
*/
public static final boolean NO_UNSAFE = hasOption(System.getProperty("joml.nounsafe", "false"));
/**
* Whether to force the use of sun.misc.Unsafe when copying memory with MemUtil.
*/
public static final boolean FORCE_UNSAFE = hasOption(System.getProperty("joml.forceUnsafe", "false"));
/**
* Whether fast approximations of some java.lang.Math operations should be used.
*/
public static final boolean FASTMATH = hasOption(System.getProperty("joml.fastmath", "false"));
/**
* When {@link #FASTMATH} is true, whether to use a lookup table for sin/cos.
*/
public static final boolean SIN_LOOKUP = hasOption(System.getProperty("joml.sinLookup", "false"));
/**
* When {@link #SIN_LOOKUP} is true, this determines the table size.
*/
public static final int SIN_LOOKUP_BITS = Integer.parseInt(System.getProperty("joml.sinLookup.bits", "14"));
/**
* Whether to use a {@link NumberFormat} producing scientific notation output when formatting matrix,
* vector and quaternion components to strings.
*/
public static final boolean useNumberFormat = hasOption(System.getProperty("joml.format", "true"));
/**
* Whether to try using java.lang.Math.fma() in most matrix/vector/quaternion operations if it is available.
* If the CPU does not support it, it will be a lot slower than `a*b+c` and potentially generate a lot of memory allocations
* for the emulation with `java.util.BigDecimal`, though.
*/
public static final boolean USE_MATH_FMA = hasOption(System.getProperty("joml.useMathFma", "false"));
/**
* When {@link #useNumberFormat} is true then this determines the number of decimal digits
* produced in the formatted numbers.
*/
public static final int numberFormatDecimals = Integer.parseInt(System.getProperty("joml.format.decimals", "3"));
/**
* The {@link NumberFormat} used to format all numbers throughout all JOML classes.
*/
public static final NumberFormat NUMBER_FORMAT = decimalFormat();
private Options() {
}
private static NumberFormat decimalFormat() {
NumberFormat df;
if (useNumberFormat) {
char[] prec = new char[numberFormatDecimals];
Arrays.fill(prec, '0');
df = new DecimalFormat(" 0." + new String(prec) + "E0;-");
} else {
df = NumberFormat.getNumberInstance(Locale.ENGLISH);
df.setGroupingUsed(false);
}
return df;
}
private static boolean hasOption(String v) {
if (v == null)
return false;
if (v.trim().length() == 0)
return true;
return Boolean.valueOf(v).booleanValue();
}
}
