Package org.faktorips.codegen.dthelpers

Class GenericValueDatatypeHelper

java.lang.Object

org.faktorips.codegen.dthelpers.AbstractDatatypeHelper

org.faktorips.codegen.dthelpers.GenericValueDatatypeHelper

All Implemented Interfaces:

BaseDatatypeHelper<JavaCodeFragment>, DatatypeHelper

public class GenericValueDatatypeHelper
extends AbstractDatatypeHelper

DatatypeHelper for GenericValueDatatype.

Field Summary

Fields inherited from interface org.faktorips.codegen.DatatypeHelper

BIG_DECIMAL, BOOLEAN, DECIMAL, INTEGER, LONG, MONEY, PRIMITIVE_BOOLEAN, PRIMITIVE_INTEGER, STRING

Constructor Summary

Constructors

Constructor	Description
GenericValueDatatypeHelper(GenericValueDatatype datatype)

Method Summary

Modifier and Type	Method	Description
GenericValueDatatype	getDatatype()	Returns the datatype this is a helper for.
String	getJavaClassName()	Returns the qualified Java class name the datatype represents.
JavaCodeFragment	getToStringExpression(String fieldName)	Returns a JavaCodeFragment containing the code for converting the value (of the given field) to a string representation with respect to its data type.
JavaCodeFragment	newInstance(String value)	Returns a JavaCodeFragment with sourcecode that creates an instance of the datatype's Java class with the given value.
JavaCodeFragment	nullExpression()	Returns "null".
protected JavaCodeFragment	valueOfExpression(String expression)	This method is supposed to be overridden by subclasses.

Methods inherited from class org.faktorips.codegen.dthelpers.AbstractDatatypeHelper

createCastExpression, getRangeJavaClassName, newEnumValueSetInstance, newEnumValueSetInstance, newInstanceFromExpression, newInstanceFromExpression, newRangeInstance, newSafeCopy, referenceOrSafeCopyIfNeccessary, setDatatype

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.faktorips.codegen.DatatypeHelper

getValueSetJavaClassName, newEnumValueSetInstance, newValueInstance

Constructor Details

GenericValueDatatypeHelper

public GenericValueDatatypeHelper(GenericValueDatatype datatype)

Method Details

getDatatype

public GenericValueDatatype getDatatype()

Description copied from interface: DatatypeHelper

Returns the datatype this is a helper for.

Specified by:

getDatatype in interface BaseDatatypeHelper<JavaCodeFragment>

Specified by:

getDatatype in interface DatatypeHelper

Overrides:

getDatatype in class AbstractDatatypeHelper

getJavaClassName

public String getJavaClassName()

Description copied from interface: DatatypeHelper

Returns the qualified Java class name the datatype represents.

valueOfExpression

protected JavaCodeFragment valueOfExpression(String expression)

Description copied from class: AbstractDatatypeHelper

This method is supposed to be overridden by subclasses.

It is used within the newInstanceFromExpression(String) method. It returns a JavaCodeFragment with sourcecode that creates an instance of the datatype's Java class with the given expression.

If the expression is null the fragment's sourcecode is either the String "null" or the sourcecode to get an instance of the appropriate null object. Preconditions: Expression may not be null or empty. When evaluated the expression must return a String.

Specified by:

valueOfExpression in class AbstractDatatypeHelper

nullExpression

public JavaCodeFragment nullExpression()

Description copied from class: AbstractDatatypeHelper

Returns "null". Returns a JavaCodeFragment with sourcecode that is either the String "null" or the sourcecode to get an instance of the appropriate null object.

Specified by:

nullExpression in interface BaseDatatypeHelper<JavaCodeFragment>

Specified by:

nullExpression in interface DatatypeHelper

Overrides:

nullExpression in class AbstractDatatypeHelper

newInstance

public JavaCodeFragment newInstance(String value)

Description copied from interface: DatatypeHelper

Returns a JavaCodeFragment with sourcecode that creates an instance of the datatype's Java class with the given value. If the value is null the fragment's sourcecode is either the String "null" or the sourcecode to get an instance of the appropriate null object.

getToStringExpression

public JavaCodeFragment getToStringExpression(String fieldName)

Description copied from interface: DatatypeHelper

Returns a JavaCodeFragment containing the code for converting the value (of the given field) to a string representation with respect to its data type. The String must be built so that it can be read using the valueOf-Expression. If the value is null, the toString-code will yield null as a result.

The default implementation will call the values toString() method or return null . The default implementation for generic (extensible) data types will call the method defined using setToStringMethodName(). Custom DatatypeHelpers may override.

Specified by:

getToStringExpression in interface BaseDatatypeHelper<JavaCodeFragment>

Specified by:

getToStringExpression in interface DatatypeHelper

Overrides:

getToStringExpression in class AbstractDatatypeHelper

Parameters:

fieldName - the name of the field in the generated class that should be converted to a string

Returns:

a JavaCodeFragment containing the toString() code.