org.appng.api.support

Class DatasourceInheritanceHelper

java.lang.Object

org.appng.api.support.DatasourceInheritanceHelper

public class DatasourceInheritanceHelper
extends Object

This is a helper class providing some static methods to process the inheritance of datasource definitions found in a resource. If a datasource id contains the inheritance separator '::' appNG clones the ancestor datasource definition and overrides or adds:

• datasource id - override
• title - override
• parameter - add
• bind class - override
• fields - add
• bean id - override
• bean options - add
• linkpanel - override
• config permissions - override
• config labels - add

The simplest usage of this inheritance mechanism can be used to create a clone of an existing datasource definition just with another datasource id to be able to place the datasource a second time with other parameters on the same page.

Author:

Claus Stümke, aiticon GmbH, 2016

Constructor Summary

Constructors

Constructor and Description
DatasourceInheritanceHelper()

Method Summary

Modifier and Type	Method and Description
static String	getAncestorId(String datasourceId) returns the part of the datasource id of a datatsource for inheritance which indicates the id of the ancestor datasource
static String	getDescendantId(String datasourceId) returns the part of the datasource id of a datatsource for inheritance which indicates the final id of the descendant
static Datasource	inherit(Datasource descendantDefinition, Datasource ancestor, MarshallService marshallService) clones the ancestor datasource and adds or overrides id, title, parameter, fields, bean options, bean id, bind class and linkpanel.
static boolean	isInheriting(String datasourceId) Returns true if the id contains exactly one inheritance separator string "::"

Methods inherited from class java.lang.Object

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

Constructor Detail

DatasourceInheritanceHelper

public DatasourceInheritanceHelper()

Method Detail

isInheriting

public static boolean isInheriting(String datasourceId)

Returns true if the id contains exactly one inheritance separator string "::"

Parameters:

datasourceId -

Returns:

true if the id contains an inheritance separator string

getDescendantId

public static String getDescendantId(String datasourceId)

returns the part of the datasource id of a datatsource for inheritance which indicates the final id of the descendant

Parameters:

datasourceId -

Returns:

the descendant's id

getAncestorId

public static String getAncestorId(String datasourceId)

returns the part of the datasource id of a datatsource for inheritance which indicates the id of the ancestor datasource

Parameters:

datasourceId -

Returns:

the ancestor's id

inherit

public static Datasource inherit(Datasource descendantDefinition,
                                 Datasource ancestor,
                                 MarshallService marshallService)

clones the ancestor datasource and adds or overrides id, title, parameter, fields, bean options, bean id, bind class and linkpanel. Returns the new datasource.

Parameters:

descendantDefinition -

ancestor -

Returns:

the cloned Datasource