public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof StandardCategoryURLGenerator)) {
            return false;
        }
        StandardCategoryURLGenerator that = (StandardCategoryURLGenerator) obj;
        if (!ObjectUtilities.equal(this.prefix, that.prefix)) {
            return false;
        }

        if (!ObjectUtilities.equal(this.seriesParameterName,
                that.seriesParameterName)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.categoryParameterName,
                that.categoryParameterName)) {
            return false;
        }
        return true;