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A Java's Collaborative Filtering library to carry out experiments in research of Collaborative Filtering based Recommender Systems. The library has been designed from researchers to researchers.

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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.math3.exception;

import org.apache.commons.math3.exception.util.Localizable;

/**
 * Base class for exceptions raised by a wrong number.
 * This class is not intended to be instantiated directly: it should serve
 * as a base class to create all the exceptions that are raised because some
 * precondition is violated by a number argument.
 *
 * @since 2.2
 */
public class MathIllegalNumberException extends MathIllegalArgumentException {

    /** Helper to avoid boxing warnings. @since 3.3 */
    protected static final Integer INTEGER_ZERO = Integer.valueOf(0);

    /** Serializable version Id. */
    private static final long serialVersionUID = -7447085893598031110L;

    /** Requested. */
    private final Number argument;

    /**
     * Construct an exception.
     *
     * @param pattern Localizable pattern.
     * @param wrong Wrong number.
     * @param arguments Arguments.
     */
    protected MathIllegalNumberException(Localizable pattern,
                                         Number wrong,
                                         Object ... arguments) {
        super(pattern, wrong, arguments);
        argument = wrong;
    }

    /**
     * @return the requested value.
     */
    public Number getArgument() {
        return argument;
    }
}