com.sap.cds.services.impl.draft

Class CqnAdapter

java.lang.Object

com.sap.cds.services.impl.draft.CqnAdapter

public class CqnAdapter
extends Object

Helper class to adapt cqn queries for draft entities.

Field Summary

Fields

Modifier and Type	Field and Description
static String	DRAFT_SUFFIX

Constructor Summary

Constructors

Constructor and Description
CqnAdapter()

Method Summary

Modifier and Type	Method and Description
static <T extends com.sap.cds.ql.cqn.CqnStatement> List<T>	adapt(T stmt, EventContext context) Adapts the where condition and fields of the statement in order to allow queries using draft fields on the normal table/view that does not contain draft fields.
static List<com.sap.cds.ql.cqn.CqnDelete>	adaptActiveEntity(com.sap.cds.ql.cqn.CqnDelete delete, EventContext context) Changes references to IsActiveEntity to true.
static String	getDraftsEntity(String entity) Returns the corresponding draft entity name.
static com.sap.cds.ql.cqn.CqnPredicate	getSecurityConstraints(EventContext context)
static com.sap.cds.ql.cqn.CqnDelete	replaceIsActiveEntity(com.sap.cds.ql.cqn.CqnDelete delete, boolean value) Replaces all references to IsActiveEntity with value
static com.sap.cds.ql.Delete<?>	toDelete(com.sap.cds.ql.cqn.CqnSelect s)
static com.sap.cds.ql.Select<?>	toSelect(com.sap.cds.ql.cqn.CqnDelete delete)

Methods inherited from class java.lang.Object

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

Field Detail

DRAFT_SUFFIX

public static final String DRAFT_SUFFIX

See Also:

Constant Field Values

Constructor Detail

CqnAdapter

public CqnAdapter()

Method Detail

getDraftsEntity

public static String getDraftsEntity(String entity)

Returns the corresponding draft entity name. If the name is already that of a draft entity it is not changed.

Parameters:

entity - the entity

Returns:

the draft entity name

adaptActiveEntity

public static List<com.sap.cds.ql.cqn.CqnDelete> adaptActiveEntity(com.sap.cds.ql.cqn.CqnDelete delete,
                                                                   EventContext context)

Changes references to IsActiveEntity to true.

Parameters:

delete - the delete statement

context - the EventContext

Returns:

a statement were all references to IsActiveEntity are changed to true

adapt

public static <T extends com.sap.cds.ql.cqn.CqnStatement> List<T> adapt(T stmt,
                                                                        EventContext context)

Adapts the where condition and fields of the statement in order to allow queries using draft fields on the normal table/view that does not contain draft fields. To achieve this, path expressions to the sibling association are used as well as the replacement of some fields with default values, e.g. IsActiveEntity.

Type Parameters:

T - the type of the statement

Parameters:

stmt - the statement

context - the EventContext

Returns:

a statement that is semantically the same but can be executed on the normal table/view

toDelete

public static com.sap.cds.ql.Delete<?> toDelete(com.sap.cds.ql.cqn.CqnSelect s)

toSelect

public static com.sap.cds.ql.Select<?> toSelect(com.sap.cds.ql.cqn.CqnDelete delete)

getSecurityConstraints

public static com.sap.cds.ql.cqn.CqnPredicate getSecurityConstraints(EventContext context)

replaceIsActiveEntity

public static com.sap.cds.ql.cqn.CqnDelete replaceIsActiveEntity(com.sap.cds.ql.cqn.CqnDelete delete,
                                                                 boolean value)

Replaces all references to IsActiveEntity with value

Parameters:

delete - the statement to adapt

value - the value for replacement

Returns:

the adapted statement