com.opengamma.strata.math.impl.minimization.MinimumBracketer.java Source code

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Here is the source code for com.opengamma.strata.math.impl.minimization.MinimumBracketer.java

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/**
 * Copyright (C) 2009 - present by OpenGamma Inc. and the OpenGamma group of companies
 *
 * Please see distribution for license.
 */
package com.opengamma.strata.math.impl.minimization;

import java.util.function.Function;

import com.google.common.math.DoubleMath;
import com.opengamma.strata.collect.ArgChecker;

/**
 * 
 */
public abstract class MinimumBracketer {
    private static final double ZERO = 1e-15;
    /**
     * 
     */
    protected static final double GOLDEN = 0.61803399;

    public abstract double[] getBracketedPoints(Function<Double, Double> f, double xLower, double xUpper);

    protected void checkInputs(Function<Double, Double> f, double xLower, double xUpper) {
        ArgChecker.notNull(f, "function");
        if (DoubleMath.fuzzyEquals(xLower, xUpper, ZERO)) {
            throw new IllegalArgumentException("Lower and upper values were not distinct");
        }
    }

}