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Java Source Code / Java Documentation » J2EE » Expresso » com.jcorporate.expresso.core.dataobjects

Source Cross Reference Class Diagram Java Document (Java Doc)

com.jcorporate.expresso.core.dataobjects .DataField

All known Subclasses:   com.jcorporate.expresso.core.dataobjects .DefaultDataField,  com.jcorporate.expresso.core.dataobjects.jdbc .JoinedDataField,
DataField
public interface DataField (Code)
This class represents a single field of data that is stored within the data object. It will provide basic manipulations such as it's original value, and attribute holdings.
author:
   Michael Rimov
since:
   Expresso 5.0.1

Method Summary
public BigDecimal asBigDecimal()
     Retrieve the wrapped object as a BigDecimal object or zero if we're unable to convert it.
public Boolean asBoolean()
     Retrieve the boolean object value.
public Date asDate()
     Retrieve the wrapped object as a Date object or possibly null if we can't convert it or the object is null.
public Double asDouble()

public Integer asInteger()
     Retrieves the wrapped object as an Integer or zero if it's an invalid format.
public InputStream asStream()
     Allows for retrieval of BLOB database types.
public String asString()

public void cacheIsChangedComparison()
     call after add() or update().
public void checkValue()
     Make sure the value of the field is valid.
public Map getAllAttributes()
     Returns a Read Only Map of all attributes in name-value pairs.
public Object getAttribute(String attributeName)
     Retrieves any user defined attributes for this field.
public DataFieldMetaData getFieldMetaData()
     Returns a handle to the Field MetaData object.
public Object getOriginalValue()

public DataObject getOwner()

public Object getValue()

public boolean isChanged()
     Used for change logging.
public boolean isNull()
     Returns true if the object is null.
public boolean isValueSet()
     Used for change logging.
public void resetChanged()

public void setAttribute(String attributeName, Object value)

public void setFieldMetaData(DataFieldMetaData newMetadata)
     Sets the metadata object for this field.
Parameters:
  newMetadata - the new Field Meta data object...
public void setOwner(DataObject newOwner)

public void setValue(Object newValue)


Method Detail
asBigDecimal
public BigDecimal asBigDecimal()(Code)
Retrieve the wrapped object as a BigDecimal object or zero if we're unable to convert it. a properly instantiated BigDecimal Object if we're able to convert it.

asBoolean
public Boolean asBoolean()(Code)
Retrieve the boolean object value. java.lang.Boolean

asDate
public Date asDate()(Code)
Retrieve the wrapped object as a Date object or possibly null if we can't convert it or the object is null. a properly instantiated Date Object if we're able to convert it.

asDouble
public Double asDouble()(Code)
Retrieve the wrapped object as a Double object or zero if we can't convert i a properly instantiated Double Object if we're able to convert it.

asInteger
public Integer asInteger()(Code)
Retrieves the wrapped object as an Integer or zero if it's an invalid format. a java.lang.Integer object, or null if the object is null.

asStream
public InputStream asStream()(Code)
Allows for retrieval of BLOB database types. java.io.InputStream

asString
public String asString()(Code)
Retrieves the wrapped object as a String java.lang.String

cacheIsChangedComparison
public void cacheIsChangedComparison()(Code)
call after add() or update(). The currentValue of data fields should be considered the baseline, the 'original value' for purposes of determining 'isChanged'

checkValue
public void checkValue() throws DataException(Code)
Make sure the value of the field is valid.
throws:
  DataException - if the field value is not valid

getAllAttributes
public Map getAllAttributes()(Code)
Returns a Read Only Map of all attributes in name-value pairs. If there are no attributes then getAllAttributes will return a null map. java.util.map

getAttribute
public Object getAttribute(String attributeName)(Code)
Retrieves any user defined attributes for this field.
Parameters:
  attributeName - the name of the attribute to retrieve an object or null if the attribute doesn't exist

getFieldMetaData
public DataFieldMetaData getFieldMetaData()(Code)
Returns a handle to the Field MetaData object. DataFieldMetaData

getOriginalValue
public Object getOriginalValue()(Code)
the original object or null

getOwner
public DataObject getOwner()(Code)
Returns a handle to the DataObject that is the container for this Data Field DataObject the containing data object.

getValue
public Object getValue()(Code)
Retrieves the wrapped object for the Data Field java.lang.Object or null

isChanged
public boolean isChanged()(Code)
Used for change logging. true if the field has changed since the last reset

isNull
public boolean isNull()(Code)
Returns true if the object is null. true if the object is null

isValueSet
public boolean isValueSet()(Code)
Used for change logging. true if the field has been set since the last reset

resetChanged
public void resetChanged()(Code)
Resets the changed flag and sets the original value field to null

setAttribute
public void setAttribute(String attributeName, Object value)(Code)
Sets an attribute for this particular instance of the Data field
Parameters:
  attributeName - the name of the attribute to set
Parameters:
  value - the value to set it to

setFieldMetaData
public void setFieldMetaData(DataFieldMetaData newMetadata)(Code)
Sets the metadata object for this field.
Parameters:
  newMetadata - the new Field Meta data object... for example DBField

setOwner
public void setOwner(DataObject newOwner)(Code)
Sets the owner of a given DataObject
Parameters:
  newOwner - The new parent object.

setValue
public void setValue(Object newValue)(Code)
Sets the wrapped object for the data field
Parameters:
  newValue - a new Object to set the value to

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