CODEWITHSUNDEEP
javahibernatejpaenums
stryker
stryker

Reputation: 149

Table as an enum. Is it possible?

How can I a map static table (which is not expandable) to an enum in Java and bind this table to another one?

For example, I have simple calculator web app (spring web MVC + hibernate) with one table (results of user's calculations) which has the following fields: id (PK), leftOperand, operation, rightOperand, result.

I would like to create a new static table (I mean for basic arithmetic operations like PLUS, MINUS, DIVIDE, MULTIPLY) with 2 fields: id(PK) and operation, and map this table to enum in Java.

So how can I bind these two tables (using operation field)? Some pseudo-code is greatly appreciated.

Note that I do not need to create a hibernate entity for the static table. Just enum.

Upvotes: 1

Views: 4089

Answers (2)

Evgeny
Evgeny

Reputation: 2568

I think you don't need static table for operation values. Just change operation field type to enum and use @Enumerated.

enum Operation {
    PLUS, MINUS;
}

@Entity
public class Calculation {

    private String leftOperand;

    @Enumerated(EnumType.STRING)
    private Operation operation;

    private String rightOperand;

}

Upvotes: 1

Pasukaru
Pasukaru

Reputation: 1105

As with classes, you can add properties to enums like so:

public enum MyEnum {
    PLUS(1, "something"),
    MINUS(2, "something");

    private final int id;
    private final String string;

    private MyEnum(int id, String string){
        this.id = id;
        this.string = string;
    }

    public int getId(){
        return id;
    }

    public String getString(){
        return string;
    }

}

Assuming the 'opreration' field matches the enum's name, you can do the following:

MyEnum enumValue = MyEnum.valueOf(map.get("operation"));

Upvotes: 1

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