pack-priv abstract Class ExpressionClassBuilder

Add a column to the existing Ordering list. Takes a column id and only adds it if it isn't in the list.

Returns:FormatableArrayHolder

the ColumnOrdering array

Finish the constructor by newing the array of Rows and putting a return at the end of it.

Exceptions

StandardException:

thrown on failure

Generate a data value. The value is to be set in the SQL data value is required on the stack and will be popped, a SQL data value is pushed.

Generate a Null data value. Nothing is required on the stack, a SQL null data value is pushed.

Generate a Null data value. The express value is required on the stack and will be popped, a SQL null data value is pushed.

Return the base class of the activation's hierarchy (the subclass of Object). This class is expected to hold methods used by all compilation code, such as datatype compilation code, e.g. getDataValueFactory.

These utility methods buffers compilation from the IndexColumnOrder class. They create an ordering based on their parameter, stuff that into the prepared statement, and then return the entry # for use in the generated code. We could write another utility method to generate code to turn an entry # back into an object, but so far no-one needs it.

This utility method returns an expression for CURRENT_DATE. Get the expression this way, because the activation needs to generate support information for CURRENT_DATE, that would otherwise be painful to create manually.

This utility method returns an expression for CURRENT_TIME. Get the expression this way, because the activation needs to generate support information for CURRENT_TIME, that would otherwise be painful to create manually.

This utility method generates an expression for CURRENT_TIMESTAMP. Get the expression this way, because the activation needs to generate support information for CURRENT_TIMESTAMP, that would otherwise be painful to create manually.

Get a method builder for adding code to the execute() method. The method builder does not actually build a method called execute. Instead, it creates a method that overrides the reinit() method, which is called from execute() on every execution in order to reinitialize the data structures.

Take the generated class, and turn it into an actual class.

This method assumes, does not check, that the class and its parts are all complete.

Parameters

savedBytes:ByteArray

place to save generated bytes. if null, it is ignored

Exceptions

StandardException:

thrown when exception occurs

Get the name of the package that the generated class will live in.

Returns:String

name of package that the generated class will live in.

Get the number of ExecRows that must be allocated

Returns:int

number of ExecRows that must be allocated

Exceptions

StandardException:

thrown on failure

"ExprFun"s are the "expression functions" that are specific to a given JSQL statement. For example, an ExprFun is generated to evaluate the where clause of a select statement and return a boolean result.

All methods return by this are expected to be called via the GeneratedMethod interface. Thus the methods are public and return java.lang.Object.

Once the exprfun has been created, the caller will need to add statements to it, minimally a return statement.

ExprFuns return Object types, since they are invoked through reflection and thus their return type would get wrapped in an object anyway. For example: return java.lang.Boolean, not boolean.

Add a field declaration to the generated class

Parameters

modifiers:int

The | of the modifier values such as public, static, etc.

type:String

The type of the field in java language.

name:String

The name of the field.

Returns:LocalField

None.

Add an arbitrarily named field to the generated class. This is used to generate fields where the caller doesn't care what the field is named. It is especially useful for generating arbitrary numbers of fields, where the caller doesn't know in advance how many fields will be used. For example, it is used for generating fields to hold intermediate values from expressions.

Parameters

modifiers:int

The | of the modifier values such as public, static, etc.

type:String

The type of the field in java language.

Returns:LocalField

The name of the new field

Activations might have need of internal functions that are not used by the result sets, but by other activation functions. Thus, we make it possible for functions to be generated directly as well as through the newExprFun interface. newExprFun should be used when a static field pointing to the expression function is needed.

The generated function will generally have a generated name that can be viewed through the MethodBuilder interface. This name is generated to ensure uniqueness from other function names in the activation class. If you pass in a function name, think carefully about whether it will collide with other names.

Parameters

returnType:String

the return type of the function

modifiers:int

the modifiers on the function

See Also

newExprFun

generates a variable name for the rowscanresultset. This can not be a fixed name because in cases like cascade delete same activation class will be dealing more than one RowScanResultSets for dependent tables.

Start a user expression. The difference between a normal expression (returned by newExprFun) and a user expression is that a user expression catches all exceptions (because we don't want random exceptions thrown from user methods to propagate to the rest of the system.

Returns:MethodBuilder

A new MethodBuilder

Generate a reference to a colunm in a result set.

Parameters

rsNumber:int

the result set number

colId:int

the column number

Push an expression that is a GeneratedMethod reference to the passed in method. aka. a "function pointer".

Generate a reference to the parameter value set that all activations use.

Get a "this" expression declared as an Activation. This is the commonly used type of the this expression.

Sets the number of subqueries under this expression

Exceptions

StandardException:

thrown on failure