SQLBooleanConstantNode

public SQLBooleanConstantNode()

Method Detail

init

public void init(java.lang.Object newValue)
          throws org.apache.derby.iapi.error.StandardException

Initializer for a SQLBooleanConstantNode.

Overrides:: init in class QueryTreeNode

generateConstant

void generateConstant(ExpressionClassBuilder acb,
                      org.apache.derby.iapi.services.compiler.MethodBuilder mb)
                throws org.apache.derby.iapi.error.StandardException

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

Specified by:: generateConstant in class ConstantNode

init

public void init(java.lang.Object typeId,
                 java.lang.Object nullable,
                 java.lang.Object maximumWidth)
          throws org.apache.derby.iapi.error.StandardException

Initializer for non-numeric types

Overrides:: init in class QueryTreeNode

setValue

void setValue(org.apache.derby.iapi.types.DataValueDescriptor value)

Set the value in this ConstantNode.

getValue

public org.apache.derby.iapi.types.DataValueDescriptor getValue()

Get the value in this ConstantNode

toString

public java.lang.String toString()

Convert this object to a String. See comments in QueryTreeNode.java for how this should be done for tree printing.

Overrides:: toString in class ValueNode

isCloneable

public boolean isCloneable()

Return whether or not this expression tree is cloneable.

Overrides:: isCloneable in class ValueNode

getClone

public ValueNode getClone()

Return a clone of this node.

Overrides:: getClone in class ValueNode

bindExpression

public ValueNode bindExpression(FromList fromList,
                                SubqueryList subqueryList,
                                java.util.Vector aggregateVector)

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.

Overrides:: bindExpression in class ValueNode

isConstantExpression

public boolean isConstantExpression()

Return whether or not this expression tree represents a constant expression.

Overrides:: isConstantExpression in class ValueNode

constantExpression

public boolean constantExpression(PredicateList whereClause)

Description copied from class: ValueNode

Return whether or not this expression tree represents a constant value. In this case, "constant" means that it will always evaluate to the same thing, even if it includes columns. A column is constant if it is compared to a constant expression.

Overrides:: constantExpression in class ValueNode

generateExpression

public void generateExpression(ExpressionClassBuilder acb,
                               org.apache.derby.iapi.services.compiler.MethodBuilder mb)
                        throws org.apache.derby.iapi.error.StandardException

For a ConstantNode, we generate the equivalent literal value. A null is generated as a Null value cast to the type of the constant node. The subtypes of ConstantNode generate literal expressions for non-null values.

Overrides:: generateExpression in class ValueNode

isNull

public boolean isNull()

Return whether or not this node represents a typed null constant.

getOrderableVariantType

protected int getOrderableVariantType()

Return the variant type for the underlying expression. The variant type can be: VARIANT - variant within a scan (method calls and non-static field access) SCAN_INVARIANT - invariant within a scan (column references from outer tables) QUERY_INVARIANT - invariant within the life of a query VARIANT - immutable

Overrides:: getOrderableVariantType in class ValueNode

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Field Summary
`protected org.apache.derby.iapi.types.DataValueDescriptor`	`value`

Method Summary
`ValueNode`	`bindExpression(FromList fromList, SubqueryList subqueryList, java.util.Vector aggregateVector)` Bind this expression.
`boolean`	`constantExpression(PredicateList whereClause)` Return whether or not this expression tree represents a constant value.
`(package private) void`	`generateConstant(ExpressionClassBuilder acb, org.apache.derby.iapi.services.compiler.MethodBuilder mb)` This generates the proper constant.
`void`	`generateExpression(ExpressionClassBuilder acb, org.apache.derby.iapi.services.compiler.MethodBuilder mb)` For a ConstantNode, we generate the equivalent literal value.
`ValueNode`	`getClone()` Return a clone of this node.
`protected int`	`getOrderableVariantType()` Return the variant type for the underlying expression.
`org.apache.derby.iapi.types.DataValueDescriptor`	`getValue()` Get the value in this ConstantNode
`void`	`init(java.lang.Object newValue)` Initializer for a SQLBooleanConstantNode.
`void`	`init(java.lang.Object typeId, java.lang.Object nullable, java.lang.Object maximumWidth)` Initializer for non-numeric types
`boolean`	`isCloneable()` Return whether or not this expression tree is cloneable.
`boolean`	`isConstantExpression()` Return whether or not this expression tree represents a constant expression.
`boolean`	`isNull()` Return whether or not this node represents a typed null constant.
`(package private) void`	`setValue(org.apache.derby.iapi.types.DataValueDescriptor value)` Set the value in this ConstantNode.
`java.lang.String`	`toString()` Convert this object to a String.

Constructor Summary
`SQLBooleanConstantNode()`

org.apache.derby.impl.sql.compile Class SQLBooleanConstantNode

value