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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.math.analysis.integration;
import org.apache.commons.math.ConvergingAlgorithmImpl;
import org.apache.commons.math.MathRuntimeException;
import org.apache.commons.math.analysis.UnivariateRealFunction;
import org.apache.commons.math.exception.util.LocalizedFormats;
import org.apache.commons.math.exception.NullArgumentException;
/**
* Provide a default implementation for several generic functions.
*
* @version $Revision: 1072409 $ $Date: 2011-02-19 19:50:36 +0100 (sam. 19 févr. 2011) $
* @since 1.2
*/
public abstract class UnivariateRealIntegratorImpl
extends ConvergingAlgorithmImpl implements UnivariateRealIntegrator {
/** Serializable version identifier. */
private static final long serialVersionUID = 6248808456637441533L;
/** minimum number of iterations */
protected int minimalIterationCount;
/** default minimum number of iterations */
protected int defaultMinimalIterationCount;
/** indicates whether an integral has been computed */
protected boolean resultComputed = false;
/** the last computed integral */
protected double result;
/**
* The integrand function.
*
* @deprecated as of 2.0 the integrand function is passed as an argument
* to the {@link #integrate(UnivariateRealFunction, double, double)}method.
*/
@Deprecated
protected UnivariateRealFunction f;
/**
* Construct an integrator with given iteration count and accuracy.
*
* @param f the integrand function
* @param defaultMaximalIterationCount maximum number of iterations
* @throws IllegalArgumentException if f is null or the iteration
* limits are not valid
* @deprecated as of 2.0 the integrand function is passed as an argument
* to the {@link #integrate(UnivariateRealFunction, double, double)}method.
*/
@Deprecated
protected UnivariateRealIntegratorImpl(final UnivariateRealFunction f,
final int defaultMaximalIterationCount)
throws IllegalArgumentException {
super(defaultMaximalIterationCount, 1.0e-15);
if (f == null) {
throw new NullArgumentException(LocalizedFormats.FUNCTION);
}
this.f = f;
// parameters that are problem specific
setRelativeAccuracy(1.0e-6);
this.defaultMinimalIterationCount = 3;
this.minimalIterationCount = defaultMinimalIterationCount;
verifyIterationCount();
}
/**
* Construct an integrator with given iteration count and accuracy.
*
* @param defaultMaximalIterationCount maximum number of iterations
* @throws IllegalArgumentException if f is null or the iteration
* limits are not valid
*/
protected UnivariateRealIntegratorImpl(final int defaultMaximalIterationCount)
throws IllegalArgumentException {
super(defaultMaximalIterationCount, 1.0e-15);
// parameters that are problem specific
setRelativeAccuracy(1.0e-6);
this.defaultMinimalIterationCount = 3;
this.minimalIterationCount = defaultMinimalIterationCount;
verifyIterationCount();
}
/**
* Access the last computed integral.
*
* @return the last computed integral
* @throws IllegalStateException if no integral has been computed
*/
public double getResult() throws IllegalStateException {
if (resultComputed) {
return result;
} else {
throw MathRuntimeException.createIllegalStateException(LocalizedFormats.NO_RESULT_AVAILABLE);
}
}
/**
* Convenience function for implementations.
*
* @param newResult the result to set
* @param iterationCount the iteration count to set
*/
protected final void setResult(double newResult, int iterationCount) {
this.result = newResult;
this.iterationCount = iterationCount;
this.resultComputed = true;
}
/**
* Convenience function for implementations.
*/
protected final void clearResult() {
this.iterationCount = 0;
this.resultComputed = false;
}
/** {@inheritDoc} */
public void setMinimalIterationCount(int count) {
minimalIterationCount = count;
}
/** {@inheritDoc} */
public int getMinimalIterationCount() {
return minimalIterationCount;
}
/** {@inheritDoc} */
public void resetMinimalIterationCount() {
minimalIterationCount = defaultMinimalIterationCount;
}
/**
* Verifies that the endpoints specify an interval.
*
* @param lower lower endpoint
* @param upper upper endpoint
* @throws IllegalArgumentException if not interval
*/
protected void verifyInterval(double lower, double upper) throws
IllegalArgumentException {
if (lower >= upper) {
throw MathRuntimeException.createIllegalArgumentException(
LocalizedFormats.ENDPOINTS_NOT_AN_INTERVAL,
lower, upper);
}
}
/**
* Verifies that the upper and lower limits of iterations are valid.
*
* @throws IllegalArgumentException if not valid
*/
protected void verifyIterationCount() throws IllegalArgumentException {
if ((minimalIterationCount <= 0) || (maximalIterationCount <= minimalIterationCount)) {
throw MathRuntimeException.createIllegalArgumentException(
LocalizedFormats.INVALID_ITERATIONS_LIMITS,
minimalIterationCount, maximalIterationCount);
}
}
}
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