org.apache.solr.client.solrj.io.eval.BicubicSplineEvaluator.java Source code

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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.solr.client.solrj.io.eval;

import java.io.IOException;
import java.util.List;

import org.apache.commons.math3.analysis.BivariateFunction;
import org.apache.commons.math3.analysis.interpolation.PiecewiseBicubicSplineInterpolator;
import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;

public class BicubicSplineEvaluator extends RecursiveObjectEvaluator implements ManyValueWorker {
    protected static final long serialVersionUID = 1L;

    public BicubicSplineEvaluator(StreamExpression expression, StreamFactory factory) throws IOException {
        super(expression, factory);
    }

    @Override
    public Object doWork(Object... objects) throws IOException {

        if (objects.length != 3) {
            throw new IOException(
                    "The bicubicSpline function requires three paremeters," + objects.length + " found.");
        }

        Object first = objects[0];
        Object second = objects[1];
        Object third = objects[2];

        double[] x = null;
        double[] y = null;
        double[][] grid = null;

        if (first instanceof List && second instanceof List && third instanceof Matrix) {
            List<Number> xlist = (List<Number>) first;
            x = new double[xlist.size()];

            for (int i = 0; i < x.length; i++) {
                x[i] = xlist.get(i).doubleValue();
            }

            List<Number> ylist = (List<Number>) second;
            y = new double[ylist.size()];

            for (int i = 0; i < y.length; i++) {
                y[i] = ylist.get(i).doubleValue();
            }

            Matrix matrix = (Matrix) third;
            grid = matrix.getData();

            PiecewiseBicubicSplineInterpolator interpolator = new PiecewiseBicubicSplineInterpolator();
            BivariateFunction bivariateFunction = interpolator.interpolate(x, y, grid);
            return bivariateFunction;
        } else {
            throw new IOException(
                    "The bicubicSpline function expects two numeric arrays and a matrix as parameters.");
        }
    }
}