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 * The ASF licenses this file to You under the Apache License, Version 2.0
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package org.apache.commons.math3.analysis.integration;

import org.apache.commons.math3.analysis.UnivariateFunction;
import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.apache.commons.math3.exception.MaxCountExceededException;
import org.apache.commons.math3.exception.NullArgumentException;
import org.apache.commons.math3.exception.TooManyEvaluationsException;

Interface for univariate real integration algorithms.
Since:
1.2/**
 * Interface for univariate real integration algorithms.
 *
 * @since 1.2
 */
public interface UnivariateIntegrator {

    
Get the relative accuracy.
Returns:
the accuracy/**
     * Get the relative accuracy.
     *
     * @return the accuracy
     */
    double getRelativeAccuracy();

    
Get the absolute accuracy.
Returns:
the accuracy/**
     * Get the absolute accuracy.
     *
     * @return the accuracy
     */
    double getAbsoluteAccuracy();

    
Get the min limit for the number of iterations.
Returns:
the actual min limit/**
     * Get the min limit for the number of iterations.
     *
     * @return the actual min limit
     */
    int getMinimalIterationCount();

    
Get the upper limit for the number of iterations.
Returns:
the actual upper limit/**
     * Get the upper limit for the number of iterations.
     *
     * @return the actual upper limit
     */
    int getMaximalIterationCount();

    
Integrate the function in the given interval.
Params:
maxEval – Maximum number of evaluations.
f – the integrand function
min – the lower bound for the interval
max – the upper bound for the interval
Throws:
TooManyEvaluationsException – if the maximum number of function
evaluations is exceeded
MaxCountExceededException – if the maximum iteration count is exceeded
or the integrator detects convergence problems otherwise
MathIllegalArgumentException – if min > max or the endpoints do not satisfy the requirements specified by the integrator
NullArgumentException – if f is null.
Returns:
the value of integral/**
     * Integrate the function in the given interval.
     *
     * @param maxEval Maximum number of evaluations.
     * @param f the integrand function
     * @param min the lower bound for the interval
     * @param max the upper bound for the interval
     * @return the value of integral
     * @throws TooManyEvaluationsException if the maximum number of function
     * evaluations is exceeded
     * @throws MaxCountExceededException if the maximum iteration count is exceeded
     * or the integrator detects convergence problems otherwise
     * @throws MathIllegalArgumentException if {@code min > max} or the endpoints do not
     * satisfy the requirements specified by the integrator
     * @throws NullArgumentException if {@code f} is {@code null}.
     */
    double integrate(int maxEval, UnivariateFunction f, double min,
                     double max)
        throws TooManyEvaluationsException, MaxCountExceededException,
               MathIllegalArgumentException, NullArgumentException;

    
Get the number of function evaluations of the last run of the integrator.
Returns:
number of function evaluations/**
     * Get the number of function evaluations of the last run of the integrator.
     *
     * @return number of function evaluations
     */
    int getEvaluations();

    
Get the number of iterations of the last run of the integrator.
Returns:
number of iterations/**
     * Get the number of iterations of the last run of the integrator.
     *
     * @return number of iterations
     */
    int getIterations();

}