Java Doc for DefaultDataField.java in  » J2EE » Expresso » com » jcorporate » expresso » core » dataobjects » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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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)   java.lang.Object    com.jcorporate.expresso.core.dataobjects.DefaultDataField DefaultDataField public class DefaultDataField implements DataField,Serializable(Code) Default implementation of the DataField interface. This class provides some basic conversion capabilities between different Java types as well as provides all use change logging capabilities. author:    Michael Rimov since:    Expresso 5.0 Field Summary final public static  String ATTRIBUTE_ERROR      Attribute String for if there's an error with the field. final public static  String ATTRIBUTE_ERROR_MESSAGE      Attribute String for what message to display if there's an error with thie field. protected  Map attributes      protected  Object currentValue      protected  boolean isChanged      protected  boolean isValueSet      protected transient  DataFieldMetaData myMetaData      A link to my metadata. protected  Object originalValue      protected transient  DataObject owner      A link to the DataObject that contains me. Constructor Summary protected   DefaultDataField(DataFieldMetaData metaData, DataObject parentObject)      Creates a new DefaultDataField object. 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. Boolean object. 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()      Retrieve the field as a InputStream. public  String asString()      public  void cacheIsChangedComparison()      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. protected  String getBooleanFieldValue(Boolean theFieldValue)      Internal refactoring for getting what a boolean field should be set to. public  DataFieldMetaData getFieldMetaData()      Returns a handle to the Field MetaData object. public static  DefaultDataField getInstance(DataFieldMetaData metaData, DataObject parentObject)      public  Object getOriginalValue()      Retrieve the last original value if the data has changed. public  DataObject getOwner()      protected  PatternMatcher getPatternMatcher()      Retrieve a thread local instance of the Perl5 pattern matcher. public  Object getSerializedForm()      Returns the form in a way suitable for storage in a database or other data source. protected  SimpleDateFormat getSimpleDateFormat(String pattern)      Get a SimpleDateFormat object that is cached. public  Object getValue()      public  boolean isChanged()      Used for change logging and updating only changed fields. change is true IF the field has been set once (after object is born or reset), and subsequently the value is changed in the field. true if the field has changed since the last reset (i.e. public  boolean isNull()      Returns true if the object is null. public  boolean isValueSet()      Used for change logging. public  void release()      public  void removeAttribute(String attribute)      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 setSerializedForm(Object o)      Used for setting raw data from a JDBC connection. public  void setValue(Object newValue)      Field Detail ATTRIBUTE_ERROR final public static String ATTRIBUTE_ERROR(Code) Attribute String for if there's an error with the field. ATTRIBUTE_ERROR_MESSAGE final public static String ATTRIBUTE_ERROR_MESSAGE(Code) Attribute String for what message to display if there's an error with thie field. attributes protected Map attributes(Code) A generic map of attribute keys to attribute values currentValue protected Object currentValue(Code) The Current Value isChanged protected boolean isChanged(Code) Flag to signify if the field is changed isValueSet protected boolean isValueSet(Code) Flag to signify if the field value has been set - the retrieved value may be null myMetaData protected transient DataFieldMetaData myMetaData(Code) A link to my metadata. originalValue protected Object originalValue(Code) The original value, used in comparison tests for 'isChanged' calculation; set by first retrieve(); reset after add() or update() owner protected transient DataObject owner(Code) A link to the DataObject that contains me. Constructor Detail DefaultDataField protected DefaultDataField(DataFieldMetaData metaData, DataObject parentObject)(Code) Creates a new DefaultDataField object. Parameters:   metaData - Parameters:   parentObject - 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. Boolean object. Null if the object's value is null 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) Retrieve the field as a InputStream. If the object's native type is an input stream, it returns that. If it is a serializable object, it returns a ByteArrayInputStream that was created using a ByteArrayOutputStream as well as a ObjectOutputStream. java.io.InputSTream or null if there was an IO Exception gettingthe value, the value was null, of if the native object is not serializable asString public String asString()(Code) Retrieves the wrapped object as a String a String value representing the object as a string cacheIsChangedComparison public void cacheIsChangedComparison()(Code) reset 'original' value and isChanged flags; call when add(), retrieve() or update() has occurred, and currentValue of data fields should be considered 'original value' for purposes of determining 'isChanged' checkValue public void checkValue() throws DataException(Code) Make sure the value of the field is valid. Checks mask and for null. 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 getBooleanFieldValue protected String getBooleanFieldValue(Boolean theFieldValue)(Code) Internal refactoring for getting what a boolean field should be set to. Parameters:   theFieldValue - The target value the string value throws:   IllegalArgumentException - If we can't get the data context getFieldMetaData public DataFieldMetaData getFieldMetaData()(Code) Returns a handle to the Field MetaData object. DataFieldMetaData getInstance public static DefaultDataField getInstance(DataFieldMetaData metaData, DataObject parentObject)(Code) create new object for this field Parameters:   metaData - Parameters:   parentObject - new instance of this field getOriginalValue public Object getOriginalValue()(Code) Retrieve the last original value if the data has changed. Will return null if isChanged() is false 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. getPatternMatcher protected PatternMatcher getPatternMatcher()(Code) Retrieve a thread local instance of the Perl5 pattern matcher. Allows for optimization of # of instances of pattern matcher vs synchronization. PatternMatcher getSerializedForm public Object getSerializedForm() throws DataException(Code) Returns the form in a way suitable for storage in a database or other data source. java.lang.Object throws:   DataException - upon error getSimpleDateFormat protected SimpleDateFormat getSimpleDateFormat(String pattern)(Code) Get a SimpleDateFormat object that is cached. Make sure you have dateConvertFormatMap already locked before calling this function or you'll have a race condition. Parameters:   pattern - the format pattern to look up an instantiated SimpleDateFormat object. SimpleDateFormat is NOTthreadsafe, so make sure you do your parsing while still in the synchronizedblock. Perhaps in the future a keyed Object pool will be better. getValue public Object getValue()(Code) retrieve value object for this field Object which contains value isChanged public boolean isChanged()(Code) Used for change logging and updating only changed fields. change is true IF the field has been set once (after object is born or reset), and subsequently the value is changed in the field. true if the field has changed since the last reset (i.e. since object was constructed or 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 had the value set since the last reset release public void release()(Code) set all internal data members to null; removeAttribute public void removeAttribute(String attribute)(Code) Removes an attribute Parameters:   attribute - The attribute key to remove resetChanged public void resetChanged()(Code) Resets the isChanged and isValueSet flags 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. setSerializedForm public void setSerializedForm(Object o)(Code) Used for setting raw data from a JDBC connection. Allows for special processing such as decryption. Parameters:   o - the object to set. setValue public void setValue(Object newValue)(Code) Sets the wrapped object for the data field; also updates values for isValueSet and isChanged flags Parameters:   newValue - a new Object to set the value to Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)