com.metamatrix.query.validator
Class UpdateValidationVisitor

java.lang.Object
  com.metamatrix.query.sql.LanguageVisitor
      com.metamatrix.query.validator.AbstractValidationVisitor
          com.metamatrix.query.validator.UpdateValidationVisitor

public class UpdateValidationVisitor
extends AbstractValidationVisitor

This visitor is used to validate updates through virtual groups. The command defining the virtual group is always a Query. This object visits various parts of this Query and verifies if the virtual group definition will allows it to be updated.

Field Summary

Fields inherited from class com.metamatrix.query.validator.AbstractValidationVisitor

currentCommand

Constructor Summary

UpdateValidationVisitor(QueryMetadataInterface metadata)
This constructor initialises the visitor by setting the metadata needed for validation.

Method Summary

protected QueryMetadataInterface	getMetadata() This method get the metadata that this visitor uses.
void	visit(Delete obj) The command being visited should never be a Delete object, this method reports a validation error if this mehod is visited.
void	visit(From obj) This method visits the From object to validate that it has only one physical group in it.
void	visit(Insert obj) The command being visited should never be a Insert object, this method reports a validation error if this mehod is visited.
void	visit(Query obj) This method visits the Query object and verifies that it has only a Select and From clause.
void	visit(Select obj) This method visits the Select and verifies that the expressions defined on it are all ElementSymbols or aliased ElementSymbols
void	visit(SetQuery obj) The command being visited should never be a SetQuery object, this method reports a validation error if this mehod is visited.
void	visit(StoredProcedure obj) The command being visited should never be a StoredProcedure object, this method reports a validation error if this mehod is visited.
void	visit(Update obj) The command being visited should never be a Update object, this method reports a validation error if this mehod is visited.

Methods inherited from class com.metamatrix.query.validator.AbstractValidationVisitor

getException, getExceptionObject, getReport, handleException, handleException, handleValidationError, handleValidationError, handleValidationError, isXMLCommand, reset, setMetadata, validateElementsSupport

Methods inherited from class com.metamatrix.query.sql.LanguageVisitor

setAbort, shouldAbort, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

UpdateValidationVisitor

public UpdateValidationVisitor(QueryMetadataInterface metadata)

This constructor initialises the visitor by setting the metadata needed for validation.

Parameters:

The - metadata object needed for validation

Method Detail

getMetadata

protected QueryMetadataInterface getMetadata()

This method get the metadata that this visitor uses.

Overrides:

getMetadata in class AbstractValidationVisitor

Returns:

The metadata object needed for validation

visit

public void visit(SetQuery obj)

The command being visited should never be a SetQuery object, this method reports a validation error if this mehod is visited.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - The SetQuery object to be visited for validation

visit

public void visit(StoredProcedure obj)

The command being visited should never be a StoredProcedure object, this method reports a validation error if this mehod is visited.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - The StoredProcedure object to be visited for validation

visit

public void visit(Insert obj)

The command being visited should never be a Insert object, this method reports a validation error if this mehod is visited.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - The Insert object to be visited for validation

visit

public void visit(Update obj)

The command being visited should never be a Update object, this method reports a validation error if this mehod is visited.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - The Update object to be visited for validation

visit

public void visit(Delete obj)

The command being visited should never be a Delete object, this method reports a validation error if this mehod is visited.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - The Delete object to be visited for validation

visit

public void visit(Query obj)

This method visits the Query object and verifies that it has only a Select and From clause.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - The Query object to be visited for validation

visit

public void visit(Select obj)

This method visits the Select and verifies that the expressions defined on it are all ElementSymbols or aliased ElementSymbols

Overrides:

visit in class LanguageVisitor

Parameters:

obj - The Select object to be visited for validation

visit

public void visit(From obj)

This method visits the From object to validate that it has only one physical group in it. It gets the list of elements present in the physical group but not specified in the Select clause and validates these elements according the guidelines governing virtual group updates.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - The From object to be visited for validation