DataType.java

enum DataType {
    // primitive
    BOOLEAN(true),
    CHARACTER(true),
    INTEGER(true),
    DECIMAL(true),
    STRING(true),

    // non-primitive
    TYPE_HASH(false),
    TYPE_LIST(false);

    private boolean isPrimitive;
    public DataType(boolean isPrimitive) {
        this.isPrimitive = isPrimitive;
    }
    public boolean isPrimitive() {
        return isPrimitive;
    }
};