= Grid
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All top-level page layout classes should implement this interface.

It is used by the xref:refguide:applib:index/services/layout/LayoutService.adoc[LayoutService] as a common based type for any layouts read in from XML.

== API

[source,java]
.Grid.java
----
interface Grid {
  Class<?> getDomainClass()
  void setDomainClass(Class<?> domainClass)
  String getTnsAndSchemaLocation()
  void setTnsAndSchemaLocation(String tnsAndSchemaLocation)
  boolean isFallback()     // <.>
  boolean isNormalized()
  void setNormalized(boolean normalized)
  LinkedHashMap<String, PropertyLayoutData> getAllPropertiesById()
  LinkedHashMap<String, CollectionLayoutData> getAllCollectionsById()
  LinkedHashMap<String, ActionLayoutData> getAllActionsById()
  void visit(Grid.Visitor visitor)
}
----

<.> xref:#isFallback_[isFallback()]
+
--
Indicates whether or not this grid is a fallback. _True_ , if this Grid originates from _org.apache.causeway.applib.services.grid.GridSystemService#defaultGrid(Class)_ .
--

== Members

[#isFallback_]
=== isFallback()

Indicates whether or not this grid is a fallback. _True_ , if this Grid originates from _org.apache.causeway.applib.services.grid.GridSystemService#defaultGrid(Class)_ .

Governs meta-model facet precedence, that is, facets from annotations should overrule those from fallback XML grids.
