Examples of org.lealone.expression.Operation

org.lealone.expression.Operation
A mathematical expression, or string concatenation.


    private Expression readConcat() {
        Expression r = readSum();
        while (true) {
            if (readIf("||")) {
                r = new Operation(Operation.CONCAT, r, readSum());
            } else if (readIf("~")) {
                if (readIf("*")) {
                    Function function = Function.getFunction(database, "CAST");
                    function.setDataType(new Column("X", Value.STRING_IGNORECASE));
                    function.setParameter(0, r);

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    private Expression readSum() {
        Expression r = readFactor();
        while (true) {
            if (readIf("+")) {
                r = new Operation(Operation.PLUS, r, readFactor());
            } else if (readIf("-")) {
                r = new Operation(Operation.MINUS, r, readFactor());
            } else {
                return r;
            }
        }
    }

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    private Expression readFactor() {
        Expression r = readTerm();
        while (true) {
            if (readIf("*")) {
                r = new Operation(Operation.MULTIPLY, r, readTerm());
            } else if (readIf("/")) {
                r = new Operation(Operation.DIVIDE, r, readTerm());
            } else if (readIf("%")) {
                r = new Operation(Operation.MODULUS, r, readTerm());
            } else {
                return r;
            }
        }
    }

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                    // (Long.MAX_VALUE+1 is of type 'decimal')
                    r = ValueExpression.get(ValueLong.get(Long.MIN_VALUE));
                }
                read();
            } else {
                r = new Operation(Operation.NEGATE, readTerm(), null);
            }
            break;
        case PLUS:
            read();
            r = readTerm();
            break;
        case OPEN:
            read();
            if (readIf(")")) {
                r = new ExpressionList(new Expression[0]);
            } else {
                r = readExpression();
                if (readIf(",")) {
                    ArrayList<Expression> list = New.arrayList();
                    list.add(r);
                    while (!readIf(")")) {
                        r = readExpression();
                        list.add(r);
                        if (!readIf(",")) {
                            read(")");
                            break;
                        }
                    }
                    Expression[] array = new Expression[list.size()];
                    list.toArray(array);
                    r = new ExpressionList(array);
                } else {
                    read(")");
                }
            }
            break;
        case TRUE:
            read();
            r = ValueExpression.get(ValueBoolean.get(true));
            break;
        case FALSE:
            read();
            r = ValueExpression.get(ValueBoolean.get(false));
            break;
        case CURRENT_TIME:
            read();
            r = readFunctionWithoutParameters("CURRENT_TIME");
            break;
        case CURRENT_DATE:
            read();
            r = readFunctionWithoutParameters("CURRENT_DATE");
            break;
        case CURRENT_TIMESTAMP: {
            Function function = Function.getFunction(database, "CURRENT_TIMESTAMP");
            read();
            if (readIf("(")) {
                if (!readIf(")")) {
                    function.setParameter(0, readExpression());
                    read(")");
                }
            }
            function.doneWithParameters();
            r = function;
            break;
        }
        case ROWNUM:
            read();
            if (readIf("(")) {
                read(")");
            }
            r = new Rownum(currentSelect == null ? currentPrepared : currentSelect);
            break;
        case NULL:
            read();
            r = ValueExpression.getNull();
            break;
        case VALUE:
            r = ValueExpression.get(currentValue);
            read();
            break;
        default:
            throw getSyntaxError();
        }
        if (readIf("[")) {
            Function function = Function.getFunction(database, "ARRAY_GET");
            function.setParameter(0, r);
            r = readExpression();
            r = new Operation(Operation.PLUS, r, ValueExpression.get(ValueInt.get(1)));
            function.setParameter(1, r);
            r = function;
            read("]");
        }
        if (readIf("::")) {

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Related Classes of org.lealone.expression.Operation

org.lealone.command.Parser

org.lealone.engine.Mode

org.lealone.value.Value

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