saffron.rel.java
Class JavaOneRow

java.lang.Object
  |
  +--saffron.rel.Rel
        |
        +--saffron.rel.OneRow
              |
              +--saffron.rel.java.JavaOneRow

public class JavaOneRow

extends OneRow

JavaOneRow implements OneRow inline.

Nested Class Summary

Nested classes inherited from class saffron.rel.OneRow

Nested classes inherited from class saffron.rel.Rel

Field Summary

Fields inherited from class saffron.rel.Rel

cluster, digest, id, rowType

Constructor Summary

JavaOneRow(Cluster cluster)

Method Summary

Object	clone()
CallingConvention	getConvention() Returns a value from CallingConvention.
Object	implement(Implementor implementor, int ordinal) Create a plan for this expression according to a calling convention.
Expression	implementSelf(Implementor implementor) Returns a Java expression which yields the current row of this relational expression.

Methods inherited from class saffron.rel.OneRow

computeSelfCost, deriveRowType, register

Methods inherited from class saffron.rel.Rel

childrenAccept, computeDigest, explain, getChildExps, getCluster, getCorelVariable, getEnvironment, getId, getInput, getInputs, getOrCreateCorelVariable, getParentEnv, getQualifier, getQuery, getRelTypeName, getRows, getRowType, getTable, getType, getVariablesStopped, implementExp, implementExps, implementFieldAccess, isAccessTo, isDistinct, onRegister, recomputeDigest, registerCorelVariable, replaceInput, setCorelVariable, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

JavaOneRow

public JavaOneRow(Cluster cluster)

Method Detail

clone

public Object clone()

Overrides:

clone in class OneRow

getConvention

public CallingConvention getConvention()

Description copied from class: Rel

Returns a value from CallingConvention.

Overrides:

getConvention in class Rel

implement

public Object implement(Implementor implementor,
                        int ordinal)

Description copied from class: Rel

Create a plan for this expression according to a calling convention.

Overrides:

implement in class Rel

Parameters:

implementor - implementor

ordinal - indicates our position in the pre-, in- and postfix walk over the tree; ordinal is -1 when called from the parent, and i when called from the i^th child.

implementSelf

public Expression implementSelf(Implementor implementor)

Description copied from class: Rel

Returns a Java expression which yields the current row of this relational expression. This method is called by the Rel.PlanImplementor the first time a piece of Java code wants to refer to this relation. The implementor then uses this expression to initialize a variable.

If no code needs to refer to this relation, then the expression is never generated. This prevents generating useless code like

Dummy_12f614.Ojp_1 oj_var8 = new Dummy_12f614.Ojp_1();

.

Overrides:

implementSelf in class Rel

See Also:

Implementor#bind(Rel,Rel)