org.problets.domain.model
Class CodeModel

java.lang.Object
  org.problets.domain.model.DomainModel
      org.problets.domain.model.CodeModel

All Implemented Interfaces:

java.lang.Cloneable

public class CodeModel
extends DomainModel

CodeModel To generate the code for the problem

Author:

Amruth Kumar

Field Summary

static int	BLOCK_SCOPE
static int	FILE_SCOPE
static int	FUNCTION_SCOPE
static int	IDENTITY
static int	PROGRAM_SCOPE

Fields inherited from class org.problets.domain.model.DomainModel

BOOLEAN, BREAKPOINT, CHARACTER, DOUBLE_PRECISION_REAL, ERROR_TYPE, EVAL_STATUS, expACTION, expASSIGNMENT, expAUTO_DEALLOCATION, expCALL, expCONDITION, expDECLARATION, expDEREFERENCING, expDYNAMIC_ALLOCATION, expDYNAMIC_ALLOCATION_INITIALIZATION, expDYNAMIC_DEALLOCATION, expELSE_CLAUSE, expERROR, expEXECUTION, expIF_CLAUSE, expINITIALIZATION, expINPUT, expPARAMETER_PASSING, expPRINT, expQUESTIONABLE, expREFERENCING, expRETURN, expRUNTIME_ERROR, expSEMANTIC_ERROR, expSYNTAX_ERROR, expUPDATE, MAX_OBJECT_IDENTITY, MIN_OBJECT_IDENTITY, QUADRUPLE_PRECISION_REAL, RUNTIME_ERROR, SEMANTIC_ERROR, SIGNED_INTEGER, SIGNED_LONG, SIGNED_SHORT, SINGLE_PRECISION_REAL, SYNTAX_ERROR, UNDEFINED_TYPE, UNSIGNED_INTEGER, UNSIGNED_LONG, UNSIGNED_SHORT, WARNING

Constructor Summary

CodeModel(Template inTemplate)

Method Summary

boolean	done() Rewind through fast forward - Idea from Guido Rossling, SIGCSE 2005 Not used - DataVisualizer.rewind() subsumes this functtion public void rewind( int limit ) { // First, re-initialize the whole model, start execution init(); // Initialize a counter of the steps to be executed // - we have already executed first step in init() int instructionCounter = 2; while( instructionCounter <= limit ) { step(); instructionCounter++; } }
void	explain(Behavior behavior) Version called by client, who wants to execute the original copy of the code
int[]	getAllLineNumbers() Returns an array of all line numbers in the code
Behavior	getBehavior() Returns a reference to the behavior of this program.
void	getCode(java.util.Vector codeText) Called by: CodeView in constructor and set_code() methods Calls: Scope.getCode() method // COULD REUSE THISCODETEXT INSTEAD
HeapModel	getHeap() Returns the heap of the current program - needed by CodeViz
InputStream	getInputStream() Returns the input stream of the current program - needed by CodeViz
Template	getOriginalTemplate() Returns a reference to the original template (before preprocessing) whose preprocessed version is used for this code
java.lang.String	getOutputAsString()
int[]	getOutputLineNumbers() Returns an array of line numbers corresponding to output statements in the code
OutputStream	getOutputStream() Returns the output stream of the current program - needed by CodeViz
Program	getProgram() Return a reference to the program in this code
Behavior	getSolution() This method is more efficient than calling getBehavior() since this executes the code once and returns the result as many times as desired
StackModel	getStack() Returns the stack of the current program - needed by CodeViz
Behavior	getStepBehavior() Returns a reference to the behavior for stepping through a code
RunEnv	getStepRunEnv() Returns a reference to the run time environment for stepping through a code
Template	getTemplate() Returns a reference to the template used for this code - needed by TutorModel to obtain antecedents etc.
void	init() Initializes the data structures to facilitate visualization, driven by the user.
static void	main(java.lang.String[] args)
void	step()
void	update(Template inTemplate) The method that generates code for a new template This will be called by ProbletPanel for the codeModel, instead of allocating new codeModel

Methods inherited from class org.problets.domain.model.DomainModel

clone, getId, getIdName, grade

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

IDENTITY

public static final int IDENTITY

See Also:

Constant Field Values

PROGRAM_SCOPE

public static final int PROGRAM_SCOPE

See Also:

Constant Field Values

FILE_SCOPE

public static final int FILE_SCOPE

See Also:

Constant Field Values

FUNCTION_SCOPE

public static final int FUNCTION_SCOPE

See Also:

Constant Field Values

BLOCK_SCOPE

public static final int BLOCK_SCOPE

See Also:

Constant Field Values

Constructor Detail

CodeModel

public CodeModel(Template inTemplate)

Method Detail

getCode

public void getCode(java.util.Vector codeText)

Called by: CodeView in constructor and set_code() methods Calls: Scope.getCode() method // COULD REUSE THISCODETEXT INSTEAD

getTemplate

public Template getTemplate()

Returns a reference to the template used for this code - needed by TutorModel to obtain antecedents etc.

getOriginalTemplate

public Template getOriginalTemplate()

Returns a reference to the original template (before preprocessing) whose preprocessed version is used for this code

getOutputAsString

public java.lang.String getOutputAsString()

getProgram

public Program getProgram()

Return a reference to the program in this code

getStack

public StackModel getStack()

Returns the stack of the current program - needed by CodeViz

getHeap

public HeapModel getHeap()

Returns the heap of the current program - needed by CodeViz

getInputStream

public InputStream getInputStream()

Returns the input stream of the current program - needed by CodeViz

getOutputStream

public OutputStream getOutputStream()

Returns the output stream of the current program - needed by CodeViz

getStepRunEnv

public RunEnv getStepRunEnv()

Returns a reference to the run time environment for stepping through a code

getStepBehavior

public Behavior getStepBehavior()

Returns a reference to the behavior for stepping through a code

getBehavior

public Behavior getBehavior()

Returns a reference to the behavior of this program. We do not want to execute the original program as soon as it is generated, because: 1) We do not want the visualization of variables to show the values assigned over the course of execution. We DO want to execute the original program as soon as it is generated, because: 1) For state problems, this is the only way we can generate the question based on a snapshot of the values of variables. 2) If we do immediate feedback or error flagging, we will need the correct answer upfront. Therefore, we will create a new copy of scope, (which will share only the template and SymbolTable with the original scope) execute the code and return the behavior resulting from its execution.

getSolution

public Behavior getSolution()

This method is more efficient than calling getBehavior() since this executes the code once and returns the result as many times as desired

getOutputLineNumbers

public int[] getOutputLineNumbers()

Returns an array of line numbers corresponding to output statements in the code

getAllLineNumbers

public int[] getAllLineNumbers()

Returns an array of all line numbers in the code

update

public void update(Template inTemplate)

The method that generates code for a new template This will be called by ProbletPanel for the codeModel, instead of allocating new codeModel

explain

public void explain(Behavior behavior)

Version called by client, who wants to execute the original copy of the code

init

public void init()

Initializes the data structures to facilitate visualization, driven by the user. Subsequently, lets the user visualize the execution of a program one instruction at a time. Reuses the SymbolTable and template created earlier. Re-initializes stack, heap, input, output. In the future, my want to reuse input - so as not to ask the user for the same inputs again. THIS FUNCTION SHOULD BE COMPLETELY RE-ENTRANT SO THAT IT CAN BE CALLED TO COMPUTE THE CORRECT BEHAVIOR OF A DUPLICATE COPY OF THE CODE

step

public void step()

done

public boolean done()

Rewind through fast forward - Idea from Guido Rossling, SIGCSE 2005 Not used - DataVisualizer.rewind() subsumes this functtion public void rewind( int limit ) { // First, re-initialize the whole model, start execution init(); // Initialize a counter of the steps to be executed // - we have already executed first step in init() int instructionCounter = 2; while( instructionCounter <= limit ) { step(); instructionCounter++; } }

main

public static void main(java.lang.String[] args)