org.mrgeo.aggregators.MinAggregator.java Source code

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Here is the source code for org.mrgeo.aggregators.MinAggregator.java

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/*
 * Copyright 2009-2016 DigitalGlobe, Inc.
 *
 * Licensed 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.mrgeo.aggregators;

import org.apache.commons.lang3.NotImplementedException;

/**
 * Uses the minimum pixel value for the resampled pixel.
 * No data values are excluded.
 */
public class MinAggregator implements Aggregator {

    @Override
    public double aggregate(double[] values, double nodata) {
        double min = Double.MAX_VALUE;
        for (int i = 0; i < values.length; i++) {
            if (Double.compare(values[i], nodata) != 0)
                min = Math.min(min, values[i]);
        }
        return (min == Double.MAX_VALUE) ? nodata : min;
    }

    @Override
    public float aggregate(float[] values, float nodata) {
        Float min = Float.MAX_VALUE;
        for (int i = 0; i < values.length; i++) {
            if (Float.compare(values[i], nodata) != 0)
                min = Math.min(min, values[i]);
        }
        return (min == Float.MAX_VALUE) ? nodata : min;
    }

    @Override
    public int aggregate(int[] values, int nodata) {
        int min = Integer.MAX_VALUE;
        for (int i = 0; i < values.length; i++) {
            if (values[i] != nodata)
                min = Math.min(min, values[i]);
        }
        return (min == Integer.MAX_VALUE) ? nodata : min;
    }

    @Override
    public double aggregate(double[][] values, double weightx, double weighty, double nodata) {
        throw new NotImplementedException("Not yet implemented");
    }

    @Override
    public float aggregate(float[][] values, double weightx, double weighty, float nodata) {
        throw new NotImplementedException("Not yet implemented");
    }

    @Override
    public int aggregate(final int[][] values, final double weightx, final double weighty, final int nodata) {
        throw new NotImplementedException("Not yet implemented");
    }

}