public final Class CharConstantNode

This class is used to hold logically different objects for space efficiency. kind represents the logical object type. See also ValueNode#isSameNodeKind.

Parameters

kind:int

The node kind

t:TypeId

The type id

cm:ContextManager

The context manager

Constructor for a CharConstantNode of a specific length.

Parameters

newValue:String

A String containing the value of the constant

newLength:int

The length of the new value of the constant

Overrides org.apache.derby.impl.sql.compile.ConstantNode.bindExpression.

Doc from org.apache.derby.impl.sql.compile.ConstantNode.bindExpression.

Bind this expression. This means binding the sub-expressions, as well as figuring out what the return type is for this expression. In this case, there are no sub-expressions, and the return type is already known, so this is just a stub.

Parameters

fromList:FromList

The FROM list for the query this expression is in, for binding columns.

subqueryList:SubqueryList

The subquery list being built as we find SubqueryNodes

aggregates:List<AggregateNode>

The aggregate list being built as we find AggregateNodes

Returns:ValueNode

The new top of the expression tree.

Annotations

@Override

Exceptions

StandardException:

Thrown on error. Although this class doesn't throw this exception, it's subclasses do and hence this method signature here needs to have throws StandardException

Implements abstract org.apache.derby.impl.sql.compile.ConstantNode.generateConstant.

This generates the proper constant. It is implemented by every specific constant node (e.g. IntConstantNode).

Parameters

acb:ExpressionClassBuilder

The ExpressionClassBuilder for the class being built

mb:MethodBuilder

The method the code to place the code

Exceptions

StandardException:

Thrown on error

Overrides org.apache.derby.impl.sql.compile.ValueNode.getConstantValueAsObject.

Return an Object representing the bind time value of this expression tree. If the expression tree does not evaluate to a constant at bind time then we return null. This is useful for bind time resolution of VTIs.

Returns:Object

An Object representing the bind time value of this expression tree. (null if not a bind time constant.)

Annotations

@Override

Exceptions

StandardException:

Thrown on error

Return the value from this CharConstantNode

Returns:String

The value of this CharConstantNode.

Exceptions

StandardException:

Thrown on error

Overrides org.apache.derby.impl.sql.compile.ValueNode.isSameNodeKind.

Doc from org.apache.derby.impl.sql.compile.ValueNode.isSameNodeKind.

Some node classes represent several logical node types (to reduce footprint), which we call kinds. This means that implementations of isEquivalent cannot always just use instanceof to check if the other node represents the same kind. Hence this method needs to be overridden by all node classes that represent several kinds. This default implementation does not look at kinds. It is only called from implementations of isEquivalent.

Parameters

o:ValueNode

The other value node whose kind we want to compare with.

Returns:boolean

true if this and o represent the same logical node type, i.e. kind.

Annotations

@Override