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The classes needed for the 'classification' service used in POMS. This os based on ClassificationScheme xml's as provided by EBU. It at the moment is only used for genres, but it could in principle accommodate other types of classification based on a fixed list.

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package nl.vpro.domain.classification;

import java.util.Arrays;

import org.checkerframework.checker.nullness.qual.NonNull;

/**
 * @author Michiel Meeuwissen
 * @since 3.0
 */
public class TermId implements Comparable {

    final int[] parts;

    public static TermId of(String id) {
        return new TermId(id);
    }

    public TermId(String id) {
        String[] stringParts = id.split("\\.");
        parts = new int[stringParts.length];
        for (int i = 0; i < stringParts.length; i++) {
            parts[i] = Integer.parseInt(stringParts[i]);
        }
    }
    public TermId(int[] parts) {
        this.parts = parts;
    }

    @Override
    public int compareTo(@NonNull TermId o) {
        if (o == null) return 1;
        for (int i = 0; i < Math.min(parts.length, o.parts.length); i++) {
            int diff = parts[i] - o.parts[i];
            if (diff != 0) return diff;
        }
        return parts.length - o.parts.length;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        TermId termId = (TermId) o;

        return Arrays.equals(parts, termId.parts);

    }

    @Override
    public int hashCode() {
        return Arrays.hashCode(parts);
    }

    @Override
    public String toString() {
        StringBuilder build = new StringBuilder();
        for (int part : parts) {
            if (build.length() > 0) build.append('.');
            build.append(part);
        }

        return build.toString();
    }


    public int[] getParts() {
        return parts;
    }

    public TermId getParentId() {
        if (this.parts.length > 1) {
            int[] clone = new int[this.parts.length - 1];
            System.arraycopy(parts, 0, clone, 0, clone.length);
            return new TermId(clone);
        } else {
            return null;
        }
    }

    public TermId next() {
        int[] clone = this.parts.clone();
        clone[clone.length - 1]++;
        return new TermId(clone);
    }

    public TermId first() {
        int[] clone = new int[this.parts.length + 1];
        System.arraycopy(parts, 0, clone, 0, parts.length);
        clone[parts.length] = 0;
        return new TermId(clone);
    }
}