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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

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package org.optaplanner.examples.common.business;

import java.io.File;
import java.util.Comparator;
import java.util.Locale;

import org.apache.commons.lang.builder.CompareToBuilder;

public class ProblemFileComparator implements Comparator {

    private static final AlphaNumericStringComparator ALPHA_NUMERIC_STRING_COMPARATOR = new AlphaNumericStringComparator();

    public int compare(File a, File b) {
        String aLowerCaseName = a.getName().toLowerCase(Locale.US);
        String bLowerCaseName = b.getName().toLowerCase(Locale.US);
        return new CompareToBuilder()
                .append(a.getParent(), b.getParent(), ALPHA_NUMERIC_STRING_COMPARATOR)
                .append(a.isDirectory(), b.isDirectory())
                .append(!aLowerCaseName.startsWith("demo"), !bLowerCaseName.startsWith("demo"))
                .append(aLowerCaseName, bLowerCaseName, ALPHA_NUMERIC_STRING_COMPARATOR)
                .append(a.getName(), b.getName())
                .toComparison();
    }

}