com.brettonw.bag.expr.Expr Maven / Gradle / Ivy

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package com.brettonw.bag.expr;

import com.brettonw.bag.Bag;
import com.brettonw.bag.BagObject;

abstract public class Expr {
    public static final String OPERATOR = "operator";
    public static final String LEFT = "left";
    public static final String RIGHT = "right";

    abstract Object evaluate (Bag bag);

    static BagObject bag (String operator, BagObject left, BagObject right) {
        return new BagObject ()
                .put (OPERATOR, operator)
                .put (LEFT, left)
                .put (RIGHT, right);
    }

    static BagObject bag (String operator, BagObject left) {
        return new BagObject ()
                .put (OPERATOR, operator)
                .put (LEFT, left);
    }

    static BagObject bag (String operator) {
        return new BagObject ()
                .put (OPERATOR, operator);
    }
}