Class ColumnProperty

java.lang.Object
  com.vaadin.data.util.sqlcontainer.ColumnProperty

All Implemented Interfaces:

Property, Serializable

public final class ColumnProperty
extends Object
implements Property

ColumnProperty represents the value of one column in a RowItem. In addition to the value, ColumnProperty also contains some basic column attributes such as nullability status, read-only status and data type. Note that depending on the QueryDelegate in use this does not necessarily map into an actual column in a database table.

See Also:

Serialized Form

Nested Class Summary
class	ColumnProperty.NotNullableException           An exception that signals that a null value was passed to the setValue method, but the value of this property can not be set to null.

 

Nested classes/interfaces inherited from interface com.vaadin.data.Property
Property.ConversionException, Property.Editor, Property.ReadOnlyException, Property.ReadOnlyStatusChangeEvent, Property.ReadOnlyStatusChangeListener, Property.ReadOnlyStatusChangeNotifier, Property.ValueChangeEvent, Property.ValueChangeListener, Property.ValueChangeNotifier, Property.Viewer

 

Constructor Summary
ColumnProperty(String propertyId, boolean readOnly, boolean allowReadOnlyChange, boolean nullable, boolean primaryKey, Object value, Class<?> type)           Creates a new ColumnProperty instance.
ColumnProperty(String propertyId, boolean readOnly, boolean allowReadOnlyChange, boolean nullable, Object value, Class<?> type)           Deprecated.

 

Method Summary
void	commit()
Object	getOldValue()           Returns the original non-modified value of this property if it has been modified.
String	getPropertyId()
Class<?>	getType()           Returns the type of the Property.
Object	getValue()           Returns the current value for this property.
boolean	isModified()
boolean	isNullable()
boolean	isPersistent()           Return whether the value of this property should be persisted to the database.
boolean	isPrimaryKey()
boolean	isReadOnly()           Tests if the Property is in read-only mode.
boolean	isReadOnlyChangeAllowed()           Returns whether the read-only status of this property can be changed using setReadOnly(boolean).
boolean	isRowIdentifier()           Returns whether or not this property is used as a row identifier.
boolean	isVersionColumn()
void	setOwner(RowItem owner)
void	setReadOnly(boolean newStatus)           Sets the Property's read-only mode to the specified status.
void	setValue(Object newValue)           Sets the value of the Property.
void	setVersionColumn(boolean versionColumn)
String	toString()           Returns the value of the Property in human readable textual format.

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Constructor Detail

ColumnProperty

@Deprecated
public ColumnProperty(String propertyId,
                                 boolean readOnly,
                                 boolean allowReadOnlyChange,
                                 boolean nullable,
                                 Object value,
                                 Class<?> type)

Deprecated. 

Deprecated constructor for ColumnProperty. If this is used the primary keys are not identified correctly in some cases for some databases (i.e. Oracle). See http://dev.vaadin.com/ticket/9145.

Parameters:

propertyId -

readOnly -

allowReadOnlyChange -

nullable -

value -

type -

ColumnProperty

public ColumnProperty(String propertyId,
                      boolean readOnly,
                      boolean allowReadOnlyChange,
                      boolean nullable,
                      boolean primaryKey,
                      Object value,
                      Class<?> type)

Creates a new ColumnProperty instance.

Parameters:

propertyId - The ID of this property.

readOnly - Whether this property is read-only.

allowReadOnlyChange - Whether the read-only status of this property can be changed.

nullable - Whether this property accepts null values.

primaryKey - Whether this property corresponds to a database primary key.

value - The value of this property.

type - The type of this property.

Method Detail

getValue

public Object getValue()

Returns the current value for this property. To get the previous value (if one exists) for a modified property use getOldValue().

Specified by:

getValue in interface Property

Returns:

getOldValue

public Object getOldValue()

Returns the original non-modified value of this property if it has been modified.

Returns:

The original value if isModified() is true, getValue() otherwise.

setValue

public void setValue(Object newValue)
              throws Property.ReadOnlyException,
                     Property.ConversionException

Description copied from interface: Property

Sets the value of the Property.

Implementing this functionality is optional. If the functionality is missing, one should declare the Property to be in read-only mode and throw Property.ReadOnlyException in this function.

Note : It is not required, but highly recommended to support setting the value also as a String in addition to the native type of the Property (as given by the getType method). If the String conversion fails or is unsupported, the method should throw Property.ConversionException. The string conversion should at least understand the format returned by the toString method of the Property.

Specified by:

setValue in interface Property

Parameters:

newValue - New value of the Property. This should be assignable to the type returned by getType, but also String type should be supported

Throws:

Property.ReadOnlyException - if the object is in read-only mode

Property.ConversionException - if newValue can't be converted into the Property's native type directly or through String

getType

public Class<?> getType()

Description copied from interface: Property

Returns the type of the Property. The methods getValue and setValue must be compatible with this type: one must be able to safely cast the value returned from getValue to the given type and pass any variable assignable to this type as an argument to setValue.

Specified by:

getType in interface Property

Returns:

type of the Property

isReadOnly

public boolean isReadOnly()

Description copied from interface: Property

Tests if the Property is in read-only mode. In read-only mode calls to the method setValue will throw ReadOnlyException and will not modify the value of the Property.

Specified by:

isReadOnly in interface Property

Returns:

true if the Property is in read-only mode, false if it's not

isReadOnlyChangeAllowed

public boolean isReadOnlyChangeAllowed()

Returns whether the read-only status of this property can be changed using setReadOnly(boolean).

Used to prevent setting to read/write mode a property that is not allowed to be written by the underlying database. Also used for values like VERSION and AUTO_INCREMENT fields that might be set to read-only by the container but the database still allows writes.

Returns:

true if the read-only status can be changed, false otherwise.

setReadOnly

public void setReadOnly(boolean newStatus)

Description copied from interface: Property

Sets the Property's read-only mode to the specified status. This functionality is optional, but all properties must implement the isReadOnly mode query correctly.

Specified by:

setReadOnly in interface Property

Parameters:

newStatus - new read-only status of the Property

isPrimaryKey

public boolean isPrimaryKey()

getPropertyId

public String getPropertyId()

toString

public String toString()

Description copied from interface: Property

Returns the value of the Property in human readable textual format. The return value should be assignable to the setValue method if the Property is not in read-only mode.

Specified by:

toString in interface Property

Overrides:

toString in class Object

Returns:

String representation of the value stored in the Property

setOwner

public void setOwner(RowItem owner)

isModified

public boolean isModified()

isVersionColumn

public boolean isVersionColumn()

setVersionColumn

public void setVersionColumn(boolean versionColumn)

isNullable

public boolean isNullable()

isPersistent

public boolean isPersistent()

Return whether the value of this property should be persisted to the database.

Returns:

true if the value should be written to the database, false otherwise.

isRowIdentifier

public boolean isRowIdentifier()

Returns whether or not this property is used as a row identifier.

Returns:

true if the property is a row identifier, false otherwise.

commit

public void commit()