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/*
* 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.sampling;
import org.apache.commons.math3.exception.MaxCountExceededException;
/**
* This interface represents a handler that should be called after
* each successful step.
*
* <p>The ODE integrators compute the evolution of the state vector at
* some grid points that depend on their own internal algorithm. Once
* they have found a new grid point (possibly after having computed
* several evaluation of the derivative at intermediate points), they
* provide it to objects implementing this interface. These objects
* typically either ignore the intermediate steps and wait for the
* last one, store the points in an ephemeris, or forward them to
* specialized processing or output methods.</p>
*
* @see org.apache.commons.math3.ode.FirstOrderIntegrator
* @see org.apache.commons.math3.ode.SecondOrderIntegrator
* @see StepInterpolator
* @since 1.2
*/
public interface StepHandler {
/** Initialize step handler at the start of an ODE integration.
* <p>
* This method is called once at the start of the integration. It
* may be used by the step handler to initialize some internal data
* if needed.
* </p>
* @param t0 start value of the independent <i>time</i> variable
* @param y0 array containing the start value of the state vector
* @param t target time for the integration
*/
void init(double t0, double[] y0, double t);
/**
* Handle the last accepted step
* @param interpolator interpolator for the last accepted step. For
* efficiency purposes, the various integrators reuse the same
* object on each call, so if the instance wants to keep it across
* all calls (for example to provide at the end of the integration a
* continuous model valid throughout the integration range, as the
* {@link org.apache.commons.math3.ode.ContinuousOutputModel
* ContinuousOutputModel} class does), it should build a local copy
* using the clone method of the interpolator and store this copy.
* Keeping only a reference to the interpolator and reusing it will
* result in unpredictable behavior (potentially crashing the application).
* @param isLast true if the step is the last one
* @exception MaxCountExceededException if the interpolator throws one because
* the number of functions evaluations is exceeded
*/
void handleStep(StepInterpolator interpolator, boolean isLast)
throws MaxCountExceededException;
}
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