com.meyling.principia.logic.rule
Class RenameBoundSubjectVariable

java.lang.Object
  |
  +--com.meyling.principia.argument.AbstractArgument
        |
        +--com.meyling.principia.argument.AbstractArgumentList
              |
              +--com.meyling.principia.logic.rule.RenameBoundSubjectVariable

All Implemented Interfaces:

Argument, Rule

public class RenameBoundSubjectVariable

extends AbstractArgumentList

implements Argument, Rule

Replace a free subject variable by another subject variable:

A[x]

-----------

A[y]

Version:

$Revision 0.00.50$

Author:

Michael Meyling

Field Summary

private SubjectVariable	find predicate variable which will be replaced
private int	n proof line number to operate on
private int	occurance occurance to replace
private SubjectVariable	replacement formula to replace the predicate variable with
private static Version	version minimum version required for using this rule

Fields inherited from class com.meyling.principia.argument.AbstractArgumentList

arguments

Constructor Summary

RenameBoundSubjectVariable(Argument[] arguments)
Constructs a replace predicate variable rule.

Method Summary

(package private) static void	() Initialize version information.
Rule	changeProofLines(int[] mapping) Get proof line numbers that are used to derive the new formula.
void	check(Module module, ProofLineList proofLines, int position, Formula formula) Check if proof could be extended with formula by replacing a bound subject variable of a proof line by another subject variable at a certain occurance.
static void	checkDeclaration(Module module, RuleDeclaration declaration) Check this rule could be declared.
Argument	create(Argument[] arguments) Create a new Argument with given arguments.
ProofLineList	extendWithout(Module module, ProofLineList proofLines, int position) Return proof lines that could replace the proof line position.
int[]	getProofLines() Get proof line numbers that are used to derive the new formula.
Version	getVersion() Get version of this rule.
String	toString() Get the argument in String form.

Methods inherited from class com.meyling.principia.argument.AbstractArgumentList

copy, getArgument, getArgumentSize

Methods inherited from class com.meyling.principia.argument.AbstractArgument

containsPatternVariables, equals, getHighestNumber, getPatternVariables, getReplacementParents, getSearchParents, hashCode, matches, matches, replace, replace, replace, replaceMatches

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, registerNatives, wait, wait, wait

Methods inherited from interface com.meyling.principia.argument.Argument

containsPatternVariables, copy, equals, getArgument, getArgumentSize, getPatternVariables, getReplacementParents, getSearchParents, hashCode, matches, matches, replace, replace, replace, replaceMatches

Field Detail

version

private static final Version version

minimum version required for using this rule

n

private final int n

proof line number to operate on

occurance

private final int occurance

occurance to replace

find

private final SubjectVariable find

predicate variable which will be replaced

replacement

private final SubjectVariable replacement

formula to replace the predicate variable with

Constructor Detail

RenameBoundSubjectVariable

public RenameBoundSubjectVariable(Argument[] arguments)
                           throws ArgumentException

Constructs a replace predicate variable rule.

Parameters:

arguments -

• 0: Counter for proof line reference (>0)
• 1: subject variable
• 2: another subject variable
• 3: occurance number ((>0))

Throws:

ArgumentException - if there are not exactly four arguments, or the arguments are not instances of Counter, SubjectVariable, SubjectVariable, Counter (in exactly this order)

Method Detail

static void ()

Initialize version information.

check

public final void check(Module module,
                        ProofLineList proofLines,
                        int position,
                        Formula formula)
                 throws ArgumentException

Check if proof could be extended with formula by replacing a bound subject variable of a proof line by another subject variable at a certain occurance.

Specified by:

check in interface Rule

Parameters:

module - module

proofLines - proof lines

position - number of proof lines that could be used in the rule

formula - formula to add

Throws:

ArgumentException - if addition is not possible because the proof line number is not allowed (e.g. between 1 and the minimum of position and current maximum proof line number) or the searched subject variable is not a bound one in the proof line or the replacement subject variable is already a free one in the proof line or the resulting formula is not equal to formula or a version conflict occurs

extendWithout

public ProofLineList extendWithout(Module module,
                                   ProofLineList proofLines,
                                   int position)
                            throws UnsupportedOperationException

Description copied from interface: Rule

Return proof lines that could replace the proof line position.

Specified by:

extendWithout in interface Rule

Following copied from interface: com.meyling.principia.logic.rule.Rule

Parameters:

module - the belonging module

proofLines - proof lines

position - referenced proof line (starting with 0) in proofLines

Returns:

proof lines that could substitute the single proof line position

Throws:

IllegalArgumentException - if extension is impossible or other problems occured if the module was checked before, this exception could only occur if there is an programming error

UnsupportedOperationException - if this rule couldn't be reduced at all because it is a basic rule

getProofLines

public int[] getProofLines()

Description copied from interface: Rule

Get proof line numbers that are used to derive the new formula.

Specified by:

getProofLines in interface Rule

Following copied from interface: com.meyling.principia.logic.rule.Rule

Returns:

numbers of involved proof lines

changeProofLines

public Rule changeProofLines(int[] mapping)

Description copied from interface: Rule

Get proof line numbers that are used to derive the new formula.

Specified by:

changeProofLines in interface Rule

Following copied from interface: com.meyling.principia.logic.rule.Rule

Parameters:

mapping - array that maps old proof line numbers (index) to new ones (value)

Returns:

same rule but with changed numbers of involved proof lines

Throws:

IllegalArgumentException - if a needed value is -1

checkDeclaration

public static final void checkDeclaration(Module module,
                                          RuleDeclaration declaration)
                                   throws ArgumentException

Check this rule could be declared.

Parameters:

module - the module context

declaration - the declaration that shall declare this rule

Throws:

IllegalArgumentException - if an programming error occured

ArgumentException - if declaration failed

getVersion

public final Version getVersion()

Description copied from interface: Rule

Get version of this rule.

Specified by:

getVersion in interface Rule

Following copied from interface: com.meyling.principia.logic.rule.Rule

Returns:

rule version

create

public final Argument create(Argument[] arguments)
                      throws ArgumentException

Description copied from interface: Argument

Create a new Argument with given arguments.

Specified by:

create in interface Argument

Overrides:

create in class AbstractArgumentList

Following copied from interface: com.meyling.principia.argument.Argument

Parameters:

arguments - with these arguments the operator should be created

Returns:

new constructed Argument

Throws:

ArgumentException - if creation failed

toString

public final String toString()

Description copied from interface: Argument

Get the argument in String form.

Specified by:

toString in interface Argument

Overrides:

toString in class AbstractArgumentList

Following copied from interface: com.meyling.principia.argument.Argument

Returns:

readable formula