Add.java

package nl.uva.polyql.ast.expressions.operators;

import nl.uva.polyql.ast.expressions.operations.BinaryOperator;
import nl.uva.polyql.ast.values.NumberValue;
import nl.uva.polyql.ast.values.StringValue;
import nl.uva.polyql.ast.values.Value;

public class Add extends BinaryOperator {

    public static final String SYNTAX = "+";

    @Override
    public String getSyntax() {
        return SYNTAX;
    }

    @Override
    public Value<?> performOperation(final NumberValue left, final NumberValue right) {
        return new NumberValue(left.getValue() + right.getValue());
    }

    @Override
    public Value<?> performOperation(final StringValue left, final StringValue right) {
        return new StringValue(left.getValue() + right.getValue());
    }

    @Override
    public Value<?> performOperation(final StringValue left, final NumberValue right) {
        return new StringValue(left.getValue() + right.getValue());
    }

    @Override
    public Value<?> performOperation(final NumberValue left, final StringValue right) {
        return new StringValue(left.getValue() + right.getValue());
    }

}