AstBuilder.java 文件源码

private static ComparisonExpressionType getComparisonOperator(Token symbol)
{
    switch (symbol.getType()) {
        case SqlBaseLexer.EQ:
            return ComparisonExpressionType.EQUAL;
        case SqlBaseLexer.NEQ:
            return ComparisonExpressionType.NOT_EQUAL;
        case SqlBaseLexer.LT:
            return ComparisonExpressionType.LESS_THAN;
        case SqlBaseLexer.LTE:
            return ComparisonExpressionType.LESS_THAN_OR_EQUAL;
        case SqlBaseLexer.GT:
            return ComparisonExpressionType.GREATER_THAN;
        case SqlBaseLexer.GTE:
            return ComparisonExpressionType.GREATER_THAN_OR_EQUAL;
    }

    throw new IllegalArgumentException("Unsupported operator: " + symbol.getText());
}