org.teiid.query.processor.proc
Class Program

java.lang.Object
  org.teiid.query.processor.proc.Program

All Implemented Interfaces:

java.lang.Cloneable

public class Program
extends java.lang.Object
implements java.lang.Cloneable

A program is a sequence of ProgramInstruction. Certain ProgramInstructions, such as IfInstruction and WhileInstruction may have pointers to sub programs.

Constructor Summary

Program()
Constructor for Program.

Method Summary

void	addInstruction(ProgramInstruction instruction)
void	addInstructions(Program instructions)
java.lang.Object	clone() Produces a deep clone.
void	decrementProgramCounter() Decrements the program counter, so that the next call to getCurrentInstruction() will return the previous instruction.
ProgramInstruction	getCurrentInstruction() Returns the next instruction to be executed, or null if there are none or no more instructions.
PlanNode	getDescriptionProperties()
ProgramInstruction	getInstructionAt(int instructionIndex) Returns the instruction to be executed at the indicated index, or null if there is no instruction at that index.
java.util.List<ProgramInstruction>	getProcessorInstructions()
void	incrementProgramCounter() Increments the program counter, so that the next call to getCurrentInstruction() will return the following instruction.
void	resetProgramCounter() Resets this program, so it can be run through again.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Program

public Program()

Constructor for Program.

Method Detail

getCurrentInstruction

public ProgramInstruction getCurrentInstruction()

Returns the next instruction to be executed, or null if there are none or no more instructions.

Returns:

ProgramInstruction to be executed next, or null if there are no more to execute (or if this Program is empty)

incrementProgramCounter

public void incrementProgramCounter()

Increments the program counter, so that the next call to getCurrentInstruction() will return the following instruction. This method is intended to be used by a ProcessingInstruction itself, to control the flow of execution.

decrementProgramCounter

public void decrementProgramCounter()

Decrements the program counter, so that the next call to getCurrentInstruction() will return the previous instruction. This method is intended to be used by a ProcessingInstruction itself, to control the flow of execution.

resetProgramCounter

public void resetProgramCounter()

Resets this program, so it can be run through again.

getInstructionAt

public ProgramInstruction getInstructionAt(int instructionIndex)

Returns the instruction to be executed at the indicated index, or null if there is no instruction at that index.

Returns:

instruction to be executed at the indicated index, or null if there is no instruction at that index.

addInstruction

public void addInstruction(ProgramInstruction instruction)

addInstructions

public void addInstructions(Program instructions)

clone

public java.lang.Object clone()

Produces a deep clone.

Overrides:

clone in class java.lang.Object

getDescriptionProperties

public PlanNode getDescriptionProperties()

getProcessorInstructions

public java.util.List<ProgramInstruction> getProcessorInstructions()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object