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jcavat/Status.java

Created October 9, 2020 09:39
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Revisions

  1. jcavat created this gist Oct 9, 2020.
    122 changes: 122 additions & 0 deletions Status.java
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,122 @@
    import java.time.LocalDate;
    import java.util.function.Consumer;

    public interface Status {

    static class Running implements Status {
    private Running() {
    }

    public boolean isRunning() {
    return true;
    }

    public boolean isCancelled() {
    return false;
    }

    public boolean isOutOfOrder() {
    return false;
    }

    public String errorMessage() {
    throw new IllegalStateException("state is running correctly!");
    }

    public LocalDate cancellationDate() {
    throw new IllegalStateException("state is running correctly!");
    }

    public void apply(Runnable ifRunning, Consumer<LocalDate> ifCancelled, Consumer<String> ifOut) {
    ifRunning.run();
    }
    }

    static class Cancelled implements Status {
    private LocalDate date;

    private Cancelled(LocalDate date) {
    this.date = date;
    }

    public boolean isRunning() {
    return false;
    }

    public boolean isCancelled() {
    return true;
    }

    public boolean isOutOfOrder() {
    return false;
    }

    public String errorMessage() {
    throw new IllegalStateException("state is cancelled. Error message couldn't exist!");
    }

    public void apply(Runnable ifRunning, Consumer<LocalDate> ifCancelled, Consumer<String> ifOut) {
    ifCancelled.accept(this.date);
    }

    public LocalDate cancellationDate() {
    return this.date;
    }
    }

    static class OutOfOrder implements Status {
    private String message;

    private OutOfOrder(String message) {
    this.message = message;
    }

    public boolean isRunning() {
    return false;
    }

    public boolean isCancelled() {
    return false;
    }

    public boolean isOutOfOrder() {
    return true;
    }

    public String errorMessage() {
    return this.message;
    }

    public LocalDate cancellationDate() {
    throw new IllegalStateException("out of order state. Error message couldn't exist");
    }

    public void apply(Runnable ifRunning, Consumer<LocalDate> ifCancelled, Consumer<String> ifOut) {
    ifOut.accept(message);
    }
    }

    boolean isRunning();

    boolean isCancelled();

    boolean isOutOfOrder();

    String errorMessage();

    LocalDate cancellationDate();

    void apply(Runnable ifRunning, Consumer<LocalDate> ifCancelled, Consumer<String> ifOut);

    static Status running() {
    return new Running();
    }

    static Status outOfOrderState(String error) {
    return new OutOfOrder(error);
    }

    static Status cancelledState(LocalDate cancellationDate) {
    return new Cancelled(cancellationDate);
    }
    }