Datacage: Added <dc:filter> element. This allows cleaner way to narrow the datasets. Example: <dc:context> <dc:statement> SELECT DISTINCT name AS hws_name, official AS hws_official, kind_id AS hws_kind FROM hws_lines WHERE river_id = ${river_id} </dc:statement> <dc:if test="dc:has-result()"> <lines> <dc:macro name="hws-lines"> <dc:elements> <hws factory="hwsfactory" name="{$hws_name}"/> </dc:elements> </dc:macro> <dc:filter expr="$hws_official=1"> <dc:if test="dc:has-result()"> <official> <dc:filter expr="$hws_kind=1"> <dc:if test="dc:has-result()"> <Durchlass><dc:call-macro name="hws-lines"></Durchlass> </dc:if> </dc:filter> <dc:filter expr="$hws_kind=2"> <dc:if test="dc:has-result()"> <Damm><dc:call-macro name="hws-lines"></Damm> </dc:if> </dc:filter> <dc:filter expr="$hws_kind=3"> <dc:if test="dc:has-result()"> <Graben><dc:call-macro name="hws-lines"></Graben> </dc:if> </dc:filter> </official> </dc:if> </dc:filter> </lines> </dc:if> </dc:context>

package de.intevation.flys.utils;

import java.util.Comparator;

/** Comparator with some tolerance (epsilon). */
public class EpsilonComparator implements Comparator<Double>
{
    public static final double EPSILON = 1e-4;

    /** Ready-made comparator with 1e-4 tolerance. */
    public static final EpsilonComparator CMP = new EpsilonComparator(EPSILON);

    private double epsilon;

    public EpsilonComparator(double epsilon) {
        this.epsilon = epsilon;
    }

    @Override
    public int compare(Double a, Double b) {
        double diff = a - b;
        if (diff < -epsilon) return -1;
        if (diff >  epsilon) return +1;
        return 0;
    }
}
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