com.softwareag.mobile.runtime.toolkit.delegates

Interface IDatasource

All Known Subinterfaces:

IListDatasource

All Known Implementing Classes:

AbstractListDatasource, ContextKeyStore, EntityListDatasource, JSONDatasource

public interface IDatasource

IListDatasource implementations manage the access to data models within the application. Details of the data model itself must not be known to the objects using it. To access the data, an expression is used to identify the requested object. For the same expression, the same object must be returned. An expression is any String that the IListDatasource implementation can use to uniquely identify the requested object.

Version:

10.3.0.0004-0525

Method Summary

Modifier and Type	Method and Description
java.lang.Object	getExpressionValue(java.lang.String expression) This method is used to retrieve an object from the data model using an expression. An expression can be any String an IDatasource implementation uses to reference an object.
void	setExpressionValue(java.lang.String expression, java.lang.Object value) This method is used to update an object in the data model. An expression can be any String an IDatasource implementation uses to reference an object.

Method Detail

getExpressionValue

java.lang.Object getExpressionValue(java.lang.String expression)
                             throws java.lang.Exception

This method is used to retrieve an object from the data model using an expression.
An expression can be any String an IDatasource implementation uses to reference an object.

Parameters:

expression - String that references an object in the data model

Returns:

the object for the given expression or null if there was no object

Throws:

java.lang.Exception - if an error occured evaluating the given expression

setExpressionValue

void setExpressionValue(java.lang.String expression,
                        java.lang.Object value)
                 throws java.lang.Exception

This method is used to update an object in the data model.
An expression can be any String an IDatasource implementation uses to reference an object.

Parameters:

expression - String that references an object in the data model

value - new object value for the given expression

Throws:

java.lang.Exception - if an error occured evaluating the given expression