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With inspiration from other libraries
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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 org.apache.commons.math3.ode;
import java.util.Collection;
import org.apache.commons.math3.analysis.solvers.UnivariateSolver;
import org.apache.commons.math3.ode.events.EventHandler;
import org.apache.commons.math3.ode.sampling.StepHandler;
/**
* This interface defines the common parts shared by integrators
* for first and second order differential equations.
* @see FirstOrderIntegrator
* @see SecondOrderIntegrator
* @since 2.0
*/
public interface ODEIntegrator {
/** Get the name of the method.
* @return name of the method
*/
String getName();
/** Add a step handler to this integrator.
* The handler will be called by the integrator for each accepted
* step.
* @param handler handler for the accepted steps
* @see #getStepHandlers()
* @see #clearStepHandlers()
* @since 2.0
*/
void addStepHandler(StepHandler handler);
/** Get all the step handlers that have been added to the integrator.
* @return an unmodifiable collection of the added events handlers
* @see #addStepHandler(StepHandler)
* @see #clearStepHandlers()
* @since 2.0
*/
Collection getStepHandlers();
/** Remove all the step handlers that have been added to the integrator.
* @see #addStepHandler(StepHandler)
* @see #getStepHandlers()
* @since 2.0
*/
void clearStepHandlers();
/** Add an event handler to the integrator.
* Uses a default {@link UnivariateSolver}
* with an absolute accuracy equal to the given convergence threshold,
* as root-finding algorithm to detect the state events.
* @param handler event handler
* @param maxCheckInterval maximal time interval between switching
* function checks (this interval prevents missing sign changes in
* case the integration steps becomes very large)
* @param convergence convergence threshold in the event time search
* @param maxIterationCount upper limit of the iteration count in
* the event time search
* @see #getEventHandlers()
* @see #clearEventHandlers()
*/
void addEventHandler(EventHandler handler, double maxCheckInterval,
double convergence, int maxIterationCount);
/** Add an event handler to the integrator.
* @param handler event handler
* @param maxCheckInterval maximal time interval between switching
* function checks (this interval prevents missing sign changes in
* case the integration steps becomes very large)
* @param convergence convergence threshold in the event time search
* @param maxIterationCount upper limit of the iteration count in
* the event time search
* @param solver The root-finding algorithm to use to detect the state
* events.
* @see #getEventHandlers()
* @see #clearEventHandlers()
*/
void addEventHandler(EventHandler handler, double maxCheckInterval,
double convergence, int maxIterationCount,
UnivariateSolver solver);
/** Get all the event handlers that have been added to the integrator.
* @return an unmodifiable collection of the added events handlers
* @see #addEventHandler(EventHandler, double, double, int)
* @see #clearEventHandlers()
*/
Collection getEventHandlers();
/** Remove all the event handlers that have been added to the integrator.
* @see #addEventHandler(EventHandler, double, double, int)
* @see #getEventHandlers()
*/
void clearEventHandlers();
/** Get the current value of the step start time ti.
* This method can be called during integration (typically by
* the object implementing the {@link FirstOrderDifferentialEquations
* differential equations} problem) if the value of the current step that
* is attempted is needed.
* The result is undefined if the method is called outside of
* calls to integrate.
* @return current value of the step start time ti
*/
double getCurrentStepStart();
/** Get the current signed value of the integration stepsize.
* This method can be called during integration (typically by
* the object implementing the {@link FirstOrderDifferentialEquations
* differential equations} problem) if the signed value of the current stepsize
* that is tried is needed.
* The result is undefined if the method is called outside of
* calls to integrate.
* @return current signed value of the stepsize
*/
double getCurrentSignedStepsize();
/** Set the maximal number of differential equations function evaluations.
* The purpose of this method is to avoid infinite loops which can occur
* for example when stringent error constraints are set or when lots of
* discrete events are triggered, thus leading to many rejected steps.
* @param maxEvaluations maximal number of function evaluations (negative
* values are silently converted to maximal integer value, thus representing
* almost unlimited evaluations)
*/
void setMaxEvaluations(int maxEvaluations);
/** Get the maximal number of functions evaluations.
* @return maximal number of functions evaluations
*/
int getMaxEvaluations();
/** Get the number of evaluations of the differential equations function.
*
* The number of evaluations corresponds to the last call to the
* integrate method. It is 0 if the method has not been called yet.
*
* @return number of evaluations of the differential equations function
*/
int getEvaluations();
}