org.datanucleus.store.rdbms.table

Class ColumnImpl

java.lang.Object

org.datanucleus.store.rdbms.table.ColumnImpl

All Implemented Interfaces:

org.datanucleus.store.schema.table.Column

public class ColumnImpl
extends Object
implements Column

Implementation of a Column in an RDBMS datastore. Contains the full definition of the column, its type, size, whether it is identity, nullable, part of the PK etc. The SQL column definition is generated here.

Field Summary

Fields

Modifier and Type	Field and Description
protected org.datanucleus.metadata.ColumnMetaData	columnMetaData ColumnMetaData for this column.
protected String	constraints Optional constraints to apply to this column in its SQL specification.
protected DatastoreMapping	datastoreMapping Datastore mapping for this column.
protected Object	defaultValue Default value accepted by the datastore for this column, from DatabaseMetaData.
protected byte	flags Operational flags, for nullability, PK, autoinc, etc.
protected DatastoreIdentifier	identifier Identifier for the column in the datastore.
protected String	storedJavaType Java type that this column is storing.
protected Table	table Table containing this column in the datastore.
protected SQLTypeInfo	typeInfo SQL Type info for the JDBC type being stored in this column
protected String[]	wrapperFunction Function wrapping the column (for example, SQRT(COLUMN)).

Fields inherited from interface org.datanucleus.store.rdbms.table.Column

WRAPPER_FUNCTION_INSERT, WRAPPER_FUNCTION_SELECT, WRAPPER_FUNCTION_UPDATE

Constructor Summary

Constructors

Constructor and Description
ColumnImpl(Table table, String javaType, DatastoreIdentifier identifier, org.datanucleus.metadata.ColumnMetaData colmd) Constructor.

Method Summary

Modifier and Type	Method and Description
String	applySelectFunction(String replacementValue) Wraps the column name with a FUNCTION.
void	checkDecimal() Checks the column definition as a decimal.
void	checkInteger() Checks the column definition as an integer.
void	checkPrimitive() Checks the column definition as a primitive.
void	checkString() Checks the column definition as a string.
void	copyConfigurationTo(Column colIn) Copy the configuration of this field to another field
boolean	equals(Object obj)
org.datanucleus.metadata.ColumnMetaData	getColumnMetaData()
org.datanucleus.store.schema.naming.ColumnType	getColumnType()
String	getConstraints()
DatastoreMapping	getDatastoreMapping() Accessor for the datastore mapping that this datastore field relates to.
Object	getDefaultValue()
DatastoreIdentifier	getIdentifier() Accessor for the identifier for this object.
JavaTypeMapping	getJavaTypeMapping() Accessor for the JavaTypeMapping for the field/property that owns this column.
org.datanucleus.metadata.JdbcType	getJdbcType()
org.datanucleus.store.schema.table.MemberColumnMapping	getMemberColumnMapping()
org.datanucleus.metadata.AbstractMemberMetaData	getMemberMetaData() Accessor for the MetaData of the field/property that this is the datastore field for.
String	getName()
int	getPosition()
String	getSQLDefinition() Accessor for the SQL definition of this column.
String	getStoredJavaType() Accessor for the type of data stored in this field.
RDBMSStoreManager	getStoreManager() Accessor for the StoreManager for this column.
Table	getTable() Accessor for the table for this column
SQLTypeInfo	getTypeInfo() Accessor for the type info for this column.
String	getTypeName()
String	getWrapperFunction(int wrapperMode) Gets the wrapper for parameters.
int	hashCode()
void	initializeColumnInfoFromDatastore(RDBMSColumnInfo ci) Initialize the default column value and auto increment
boolean	isDefaultable()
boolean	isIdentity() Accessor for the whether this column is an identity column.
boolean	isNullable()
boolean	isPrimaryKey()
boolean	isUnique()
boolean	isUnlimitedLength() Convenience method to check if the length is required to be unlimited (BLOB/CLOB).
Column	setColumnMetaData(org.datanucleus.metadata.ColumnMetaData colmd)
Column	setConstraints(String constraints) Mutator for the constraints of the column.
void	setDatastoreMapping(DatastoreMapping mapping) Method to associate this datastore field with its mapping.
Column	setDefaultable(Object defaultValue)
void	setIdentifier(DatastoreIdentifier identifier) Mutator for the identifier of the column.
Column	setIdentity(boolean identity) Mutator for whether we set this column as an identity column.
Column	setJdbcType(org.datanucleus.metadata.JdbcType jdbcType)
Column	setNullable(boolean flag)
Column	setPosition(int pos)
Column	setPrimaryKey()
Column	setTypeInfo(SQLTypeInfo typeInfo) Mutator for the type information of the column.
Column	setTypeName(String type)
Column	setUnique(boolean flag)
void	setWrapperFunction(String wrapperFunction, int wrapperMode) Sets a function to wrap the column.
String	toString()
void	validate(RDBMSColumnInfo ci) Method to validate the contents of the column.

Methods inherited from class java.lang.Object

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

Field Detail

identifier

protected DatastoreIdentifier identifier

Identifier for the column in the datastore.

columnMetaData

protected org.datanucleus.metadata.ColumnMetaData columnMetaData

ColumnMetaData for this column.

table

protected final Table table

Table containing this column in the datastore.

datastoreMapping

protected DatastoreMapping datastoreMapping

Datastore mapping for this column.

storedJavaType

protected final String storedJavaType

Java type that this column is storing. (can we just get this from the mapping above ?)

typeInfo

protected SQLTypeInfo typeInfo

SQL Type info for the JDBC type being stored in this column

constraints

protected String constraints

Optional constraints to apply to this column in its SQL specification.

flags

protected byte flags

Operational flags, for nullability, PK, autoinc, etc.

defaultValue

protected Object defaultValue

Default value accepted by the datastore for this column, from DatabaseMetaData.

wrapperFunction

protected String[] wrapperFunction

Function wrapping the column (for example, SQRT(COLUMN)).

Constructor Detail

ColumnImpl

public ColumnImpl(Table table,
                  String javaType,
                  DatastoreIdentifier identifier,
                  org.datanucleus.metadata.ColumnMetaData colmd)

Constructor.

Parameters:

table - The table in the datastore that this column belongs to.

javaType - The type of data being stored in this column

identifier - The identifier of the column (in the datastore).

colmd - The ColumnMetaData for this column

Method Detail

getName

public String getName()

Specified by:

getName in interface org.datanucleus.store.schema.table.Column

getMemberColumnMapping

public org.datanucleus.store.schema.table.MemberColumnMapping getMemberColumnMapping()

Specified by:

getMemberColumnMapping in interface org.datanucleus.store.schema.table.Column

getColumnType

public org.datanucleus.store.schema.naming.ColumnType getColumnType()

Specified by:

getColumnType in interface org.datanucleus.store.schema.table.Column

setJdbcType

public Column setJdbcType(org.datanucleus.metadata.JdbcType jdbcType)

Specified by:

setJdbcType in interface org.datanucleus.store.schema.table.Column

getJdbcType

public org.datanucleus.metadata.JdbcType getJdbcType()

Specified by:

getJdbcType in interface org.datanucleus.store.schema.table.Column

setTypeName

public Column setTypeName(String type)

Specified by:

setTypeName in interface org.datanucleus.store.schema.table.Column

getTypeName

public String getTypeName()

Specified by:

getTypeName in interface org.datanucleus.store.schema.table.Column

setPosition

public Column setPosition(int pos)

Specified by:

setPosition in interface org.datanucleus.store.schema.table.Column

getPosition

public int getPosition()

Specified by:

getPosition in interface org.datanucleus.store.schema.table.Column

isUnlimitedLength

public boolean isUnlimitedLength()

Description copied from interface: Column

Convenience method to check if the length is required to be unlimited (BLOB/CLOB).

Returns:

Whether unlimited length required.

getIdentifier

public DatastoreIdentifier getIdentifier()

Description copied from interface: Column

Accessor for the identifier for this object.

Returns:

The identifier.

setIdentifier

public void setIdentifier(DatastoreIdentifier identifier)

Description copied from interface: Column

Mutator for the identifier of the column.

Parameters:

identifier - The identifier

getTable

public Table getTable()

Description copied from interface: Column

Accessor for the table for this column

Specified by:

getTable in interface org.datanucleus.store.schema.table.Column

Returns:

The table

getDatastoreMapping

public DatastoreMapping getDatastoreMapping()

Description copied from interface: Column

Accessor for the datastore mapping that this datastore field relates to.

Returns:

The datastore mapping

setDatastoreMapping

public void setDatastoreMapping(DatastoreMapping mapping)

Description copied from interface: Column

Method to associate this datastore field with its mapping.

Parameters:

mapping - The mapping for this datastore field

getJavaTypeMapping

public JavaTypeMapping getJavaTypeMapping()

Description copied from interface: Column

Accessor for the JavaTypeMapping for the field/property that owns this column.

Returns:

The JavaTypeMapping

getStoredJavaType

public String getStoredJavaType()

Description copied from interface: Column

Accessor for the type of data stored in this field.

Returns:

The type of data in the field.

setTypeInfo

public final Column setTypeInfo(SQLTypeInfo typeInfo)

Description copied from interface: Column

Mutator for the type information of the column.

Parameters:

typeInfo - The type info

Returns:

The column with the updated info

getTypeInfo

public final SQLTypeInfo getTypeInfo()

Description copied from interface: Column

Accessor for the type info for this column.

Returns:

The type info

getStoreManager

public RDBMSStoreManager getStoreManager()

Description copied from interface: Column

Accessor for the StoreManager for this column.

Returns:

The StoreManager.

getSQLDefinition

public String getSQLDefinition()

Description copied from interface: Column

Accessor for the SQL definition of this column.

Returns:

The SQL definition of the column

initializeColumnInfoFromDatastore

public void initializeColumnInfoFromDatastore(RDBMSColumnInfo ci)

Description copied from interface: Column

Initialize the default column value and auto increment

Parameters:

ci - The column information

validate

public void validate(RDBMSColumnInfo ci)

Description copied from interface: Column

Method to validate the contents of the column. This method can throw IncompatibleDataTypeException, WrongScaleException, WrongPrecisionException, IsNullableException if the data in the column is not compatible with the supplied ColumnInfo.

Parameters:

ci - The column information taken from the database

setConstraints

public final Column setConstraints(String constraints)

Description copied from interface: Column

Mutator for the constraints of the column.

Parameters:

constraints - The constraints

Returns:

The column with the updated info

setPrimaryKey

public final Column setPrimaryKey()

Specified by:

setPrimaryKey in interface org.datanucleus.store.schema.table.Column

setNullable

public final Column setNullable(boolean flag)

Specified by:

setNullable in interface org.datanucleus.store.schema.table.Column

setDefaultable

public final Column setDefaultable(Object defaultValue)

Specified by:

setDefaultable in interface org.datanucleus.store.schema.table.Column

setUnique

public final Column setUnique(boolean flag)

Specified by:

setUnique in interface org.datanucleus.store.schema.table.Column

setIdentity

public Column setIdentity(boolean identity)

Description copied from interface: Column

Mutator for whether we set this column as an identity column. An "identity" column is typically treated differently in the datastore being given a value by the datastore itself. In RDBMS this would mean that the column is "AUTO_INCREMENT", "SERIAL" etc

Parameters:

identity - True if column is identity

Returns:

The Column

isPrimaryKey

public final boolean isPrimaryKey()

Specified by:

isPrimaryKey in interface org.datanucleus.store.schema.table.Column

isNullable

public final boolean isNullable()

Specified by:

isNullable in interface org.datanucleus.store.schema.table.Column

isDefaultable

public final boolean isDefaultable()

Specified by:

isDefaultable in interface org.datanucleus.store.schema.table.Column

isUnique

public final boolean isUnique()

Specified by:

isUnique in interface org.datanucleus.store.schema.table.Column

isIdentity

public boolean isIdentity()

Description copied from interface: Column

Accessor for the whether this column is an identity column.

Returns:

true if column is identity.

applySelectFunction

public String applySelectFunction(String replacementValue)

Description copied from interface: Column

Wraps the column name with a FUNCTION.

example: SQRT(?) generates: SQRT(columnName)

Parameters:

replacementValue - the replacement to ?. Probably it's a column name, that may be fully qualified name or not

Returns:

a String with function taking as parameter the replacementValue

getDefaultValue

public Object getDefaultValue()

Specified by:

getDefaultValue in interface org.datanucleus.store.schema.table.Column

getColumnMetaData

public final org.datanucleus.metadata.ColumnMetaData getColumnMetaData()

Specified by:

getColumnMetaData in interface org.datanucleus.store.schema.table.Column

getMemberMetaData

public org.datanucleus.metadata.AbstractMemberMetaData getMemberMetaData()

Description copied from interface: Column

Accessor for the MetaData of the field/property that this is the datastore field for.

Returns:

MetaData of the field/property (if representing a field/property of a class).

setColumnMetaData

public Column setColumnMetaData(org.datanucleus.metadata.ColumnMetaData colmd)

Specified by:

setColumnMetaData in interface org.datanucleus.store.schema.table.Column

getConstraints

public String getConstraints()

Returns:

Returns the constraints.

checkPrimitive

public final void checkPrimitive()
                          throws ColumnDefinitionException

Description copied from interface: Column

Checks the column definition as a primitive.

Throws:

ColumnDefinitionException - if an error occurs

checkInteger

public final void checkInteger()
                        throws ColumnDefinitionException

Description copied from interface: Column

Checks the column definition as an integer.

Throws:

ColumnDefinitionException - if an error occurs

checkDecimal

public final void checkDecimal()
                        throws ColumnDefinitionException

Description copied from interface: Column

Checks the column definition as a decimal.

Throws:

ColumnDefinitionException - if an error occurs

checkString

public final void checkString()
                       throws ColumnDefinitionException

Description copied from interface: Column

Checks the column definition as a string.

Throws:

ColumnDefinitionException - if an error occurs

copyConfigurationTo

public void copyConfigurationTo(Column colIn)

Description copied from interface: Column

Copy the configuration of this field to another field

Parameters:

colIn - the column to copy

setWrapperFunction

public void setWrapperFunction(String wrapperFunction,
                               int wrapperMode)

Description copied from interface: Column

Sets a function to wrap the column. The wrapper function String must use "?" to be replaced later by the column name. For example

SQRT(?) generates: SQRT(COLUMN)

Parameters:

wrapperFunction - The wrapperFunction to set.

wrapperMode - whether select, insert or update

getWrapperFunction

public String getWrapperFunction(int wrapperMode)

Description copied from interface: Column

Gets the wrapper for parameters.

Parameters:

wrapperMode - whether select, insert or update

Returns:

Returns the wrapperFunction.

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object