Method hashCode

src/main/java/groovy/util/Expando.java:183–194

This allows hashCode to be overridden by a closure field method attached to the expando object. @see java.lang.Object#hashCode()

()

     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        Object method = getProperties().get("hashCode");
        if (method instanceof Closure closure) {
            // invoke overridden hashCode closure method
            closure.setDelegate(this);
            Integer ret = (Integer) closure.call();
            return ret;
        } else {
            return super.hashCode();
        }
    }

    /**
     * Factory method to create a new Map used to store the expando properties map