Source Code Cross Referenced for AbstractUnivariateStatistic.java in  » Science » Apache-commons-math-1.1 » org » apache » commons » math » stat » descriptive » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Apache commons math 1.1 » org.apache.commons.math.stat.descriptive 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2003-2004 The Apache Software Foundation.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:        package org.apache.commons.math.stat.descriptive;
017:
018:        import java.io.Serializable;
019:
020:        /**
021:         * Abstract base class for all implementations of the 
022:         * {@link UnivariateStatistic} interface.
023:         * <p>
024:         * Provides a default implementation of <code>evaluate(double[]),</code> 
025:         * delegating to <code>evaluate(double[], int, int)</code> in the natural way.
026:         * <p>
027:         * Also includes a <code>test</code> method that performs generic parameter
028:         * validation for the <code>evaluate</code> methods.
029:         * <p>
030:         * 
031:         * @version $Revision: 348519 $ $Date: 2005-11-23 12:12:18 -0700 (Wed, 23 Nov 2005) $
032:         */
033:        public abstract class AbstractUnivariateStatistic implements 
034:                UnivariateStatistic, Serializable {
035:
036:            /** Serialization UID */
037:            private static final long serialVersionUID = -8007759382851708045L;
038:
039:            /**
040:             * @see org.apache.commons.math.stat.descriptive.UnivariateStatistic#evaluate(double[])
041:             */
042:            public double evaluate(final double[] values) {
043:                test(values, 0, 0);
044:                return evaluate(values, 0, values.length);
045:            }
046:
047:            /**
048:             * @see org.apache.commons.math.stat.descriptive.UnivariateStatistic#evaluate(double[], int, int)
049:             */
050:            public abstract double evaluate(final double[] values,
051:                    final int begin, final int length);
052:
053:            /**
054:             * This method is used by <code>evaluate(double[], int, int)</code> methods
055:             * to verify that the input parameters designate a subarray of positive length.
056:             * <p>
057:             * <ul>
058:             * <li>returns <code>true</code> iff the parameters designate a subarray of 
059:             * positive length</li>
060:             * <li>throws <code>IllegalArgumentException</code> if the array is null or
061:             * or the indices are invalid</li>
062:             * <li>returns <code>false</li> if the array is non-null, but 
063:             * <code>length</code> is 0.
064:             * </ul>
065:             *
066:             * @param values the input array
067:             * @param begin index of the first array element to include
068:             * @param length the number of elements to include
069:             * @return true if the parameters are valid and designate a subarray of positive length
070:             * @throws IllegalArgumentException if the indices are invalid or the array is null
071:             */
072:            protected boolean test(final double[] values, final int begin,
073:                    final int length) {
074:
075:                if (values == null) {
076:                    throw new IllegalArgumentException(
077:                            "input value array is null");
078:                }
079:
080:                if (begin < 0) {
081:                    throw new IllegalArgumentException(
082:                            "start position cannot be negative");
083:                }
084:
085:                if (length < 0) {
086:                    throw new IllegalArgumentException(
087:                            "length cannot be negative");
088:                }
089:
090:                if (begin + length > values.length) {
091:                    throw new IllegalArgumentException(
092:                            "begin + length > values.length");
093:                }
094:
095:                if (length == 0) {
096:                    return false;
097:                }
098:
099:                return true;
100:
101:            }
102:        }
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