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

/**
 * Exception to be thrown when two dimensions differ.
 *
 * @since 2.2
 */
public class DimensionMismatchException extends MathIllegalNumberException {
    /** Serializable version Id. */
    private static final long serialVersionUID = -8415396756375798143L;
    /** Correct dimension. */
    private final int dimension;

    /**
     * Construct an exception from the mismatched dimensions.
     *
     * @param specific Specific context information pattern.
     * @param wrong Wrong dimension.
     * @param expected Expected dimension.
     */
    public DimensionMismatchException(Localizable specific,
                                      int wrong,
                                      int expected) {
        super(specific, Integer.valueOf(wrong), Integer.valueOf(expected));
        dimension = expected;
    }

    /**
     * Construct an exception from the mismatched dimensions.
     *
     * @param wrong Wrong dimension.
     * @param expected Expected dimension.
     */
    public DimensionMismatchException(int wrong,
                                      int expected) {
        this(LocalizedFormats.DIMENSIONS_MISMATCH_SIMPLE, wrong, expected);
    }

    /**
     * @return the expected dimension.
     */
    public int getDimension() {
        return dimension;
    }
}