1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* 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.math.ode.sampling;
import org.apache.commons.math.ode.DerivativeException;
/**
* 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.math.ode.FirstOrderIntegrator
* @see org.apache.commons.math.ode.SecondOrderIntegrator
* @see StepInterpolator
* @version $Revision: 1073158 $ $Date: 2011-02-21 22:46:52 +0100 (lun. 21 févr. 2011) $
* @since 1.2
*/
public interface StepHandler {
/** Determines whether this handler needs dense output.
* <p>This method allows the integrator to avoid performing extra
* computation if the handler does not need dense output. If this
* method returns false, the integrator will call the {@link
* #handleStep} method with a {@link DummyStepInterpolator} rather
* than a custom interpolator.</p>
* @return true if the handler needs dense output
*/
boolean requiresDenseOutput();
/** Reset the step handler.
* Initialize the internal data as required before the first step is
* handled.
*/
void reset();
/**
* 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.math.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 DerivativeException if user code called from step interpolator
* finalization triggers one
*/
void handleStep(StepInterpolator interpolator, boolean isLast) throws DerivativeException;
}
|
