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Java example source code file (AbstractStorelessUnivariateStatistic.java)

This example Java source code file (AbstractStorelessUnivariateStatistic.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

abstractstorelessunivariatestatistic, abstractunivariatestatistic, mathillegalargumentexception, override, storelessunivariatestatistic

The AbstractStorelessUnivariateStatistic.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.stat.descriptive;

import org.apache.commons.math3.exception.util.LocalizedFormats;
import org.apache.commons.math3.exception.MathIllegalArgumentException;
import org.apache.commons.math3.exception.NullArgumentException;
import org.apache.commons.math3.util.MathUtils;
import org.apache.commons.math3.util.Precision;

/**
 *
 * Abstract implementation of the {@link StorelessUnivariateStatistic} interface.
 * <p>
 * Provides default <code>evaluate() and incrementAll(double[])
 * implementations.</p>
 * <p>
 * <strong>Note that these implementations are not synchronized.

* */ public abstract class AbstractStorelessUnivariateStatistic extends AbstractUnivariateStatistic implements StorelessUnivariateStatistic { /** * This default implementation calls {@link #clear}, then invokes * {@link #increment} in a loop over the the input array, and then uses * {@link #getResult} to compute the return value. * <p> * Note that this implementation changes the internal state of the * statistic. Its side effects are the same as invoking {@link #clear} and * then {@link #incrementAll(double[])}.</p> * <p> * Implementations may override this method with a more efficient and * possibly more accurate implementation that works directly with the * input array.</p> * <p> * If the array is null, a MathIllegalArgumentException is thrown.</p> * @param values input array * @return the value of the statistic applied to the input array * @throws MathIllegalArgumentException if values is null * @see org.apache.commons.math3.stat.descriptive.UnivariateStatistic#evaluate(double[]) */ @Override public double evaluate(final double[] values) throws MathIllegalArgumentException { if (values == null) { throw new NullArgumentException(LocalizedFormats.INPUT_ARRAY); } return evaluate(values, 0, values.length); } /** * This default implementation calls {@link #clear}, then invokes * {@link #increment} in a loop over the specified portion of the input * array, and then uses {@link #getResult} to compute the return value. * <p> * Note that this implementation changes the internal state of the * statistic. Its side effects are the same as invoking {@link #clear} and * then {@link #incrementAll(double[], int, int)}.</p> * <p> * Implementations may override this method with a more efficient and * possibly more accurate implementation that works directly with the * input array.</p> * <p> * If the array is null or the index parameters are not valid, an * MathIllegalArgumentException is thrown.</p> * @param values the input array * @param begin the index of the first element to include * @param length the number of elements to include * @return the value of the statistic applied to the included array entries * @throws MathIllegalArgumentException if the array is null or the indices are not valid * @see org.apache.commons.math3.stat.descriptive.UnivariateStatistic#evaluate(double[], int, int) */ @Override public double evaluate(final double[] values, final int begin, final int length) throws MathIllegalArgumentException { if (test(values, begin, length)) { clear(); incrementAll(values, begin, length); } return getResult(); } /** * {@inheritDoc} */ @Override public abstract StorelessUnivariateStatistic copy(); /** * {@inheritDoc} */ public abstract void clear(); /** * {@inheritDoc} */ public abstract double getResult(); /** * {@inheritDoc} */ public abstract void increment(final double d); /** * This default implementation just calls {@link #increment} in a loop over * the input array. * <p> * Throws IllegalArgumentException if the input values array is null.</p> * * @param values values to add * @throws MathIllegalArgumentException if values is null * @see org.apache.commons.math3.stat.descriptive.StorelessUnivariateStatistic#incrementAll(double[]) */ public void incrementAll(double[] values) throws MathIllegalArgumentException { if (values == null) { throw new NullArgumentException(LocalizedFormats.INPUT_ARRAY); } incrementAll(values, 0, values.length); } /** * This default implementation just calls {@link #increment} in a loop over * the specified portion of the input array. * <p> * Throws IllegalArgumentException if the input values array is null.</p> * * @param values array holding values to add * @param begin index of the first array element to add * @param length number of array elements to add * @throws MathIllegalArgumentException if values is null * @see org.apache.commons.math3.stat.descriptive.StorelessUnivariateStatistic#incrementAll(double[], int, int) */ public void incrementAll(double[] values, int begin, int length) throws MathIllegalArgumentException { if (test(values, begin, length)) { int k = begin + length; for (int i = begin; i < k; i++) { increment(values[i]); } } } /** * Returns true iff <code>object is an * <code>AbstractStorelessUnivariateStatistic returning the same * values as this for <code>getResult() and getN() * @param object object to test equality against. * @return true if object returns the same value as this */ @Override public boolean equals(Object object) { if (object == this ) { return true; } if (object instanceof AbstractStorelessUnivariateStatistic == false) { return false; } AbstractStorelessUnivariateStatistic stat = (AbstractStorelessUnivariateStatistic) object; return Precision.equalsIncludingNaN(stat.getResult(), this.getResult()) && Precision.equalsIncludingNaN(stat.getN(), this.getN()); } /** * Returns hash code based on getResult() and getN() * * @return hash code */ @Override public int hashCode() { return 31* (31 + MathUtils.hash(getResult())) + MathUtils.hash(getN()); } }

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