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Java example source code file (FieldFixedStepHandler.java)

This example Java source code file (FieldFixedStepHandler.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

fieldfixedstephandler, realfieldelement

The FieldFixedStepHandler.java Java example source code

/*
 * 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.RealFieldElement;
import org.apache.commons.math3.ode.FieldODEStateAndDerivative;

/**
 * This interface represents a handler that should be called after
 * each successful fixed step.

 * <p>This interface should be implemented by anyone who is interested
 * in getting the solution of an ordinary differential equation at
 * fixed time steps. Objects implementing this interface should be
 * wrapped within an instance of {@link FieldStepNormalizer} that itself
 * is used as the general {@link FieldStepHandler} by the integrator. The
 * {@link FieldStepNormalizer} object is called according to the integrator
 * internal algorithms and it calls objects implementing this
 * interface as necessary at fixed time steps.</p>
 *
 * @see FieldStepHandler
 * @see FieldStepNormalizer
 * @see FieldStepInterpolator
 * @param <T> the type of the field elements
 * @since 3.6
 */

public interface FieldFixedStepHandler<T extends RealFieldElement {

    /** 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 initialState initial time, state vector and derivative
     * @param finalTime target time for the integration
     */
    void init(FieldODEStateAndDerivative<T> initialState, T finalTime);

    /**
     * Handle the last accepted step
     * @param state current value of the independent <i>time variable,
     * state vector and derivative
     * For efficiency purposes, the {@link FieldStepNormalizer} class reuses
     * the same array 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 complete array of all
     * steps), it should build a local copy store this copy.
     * @param isLast true if the step is the last one
     */
    void handleStep(FieldODEStateAndDerivative<T> state, boolean isLast);

}

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