diff options
Diffstat (limited to 'projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/ChildDataSource.java')
| -rw-r--r-- | projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/ChildDataSource.java | 282 |
1 files changed, 119 insertions, 163 deletions
diff --git a/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/ChildDataSource.java b/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/ChildDataSource.java index 8123668..1d62881 100644 --- a/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/ChildDataSource.java +++ b/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/ChildDataSource.java @@ -7,181 +7,137 @@ import net.wotonomy.foundation.NSArray; import net.wotonomy.foundation.NSMutableArray; /** -* A data source that automates the process of -* creating a child editing context and copying -* objects from a parent context into it. -* Attach this data source to a display group -* that represents a "detail" or "drill-down" -* view. <br><br> -* -* Once created, editingContext() will return the -* child context, and fetch() will return the objects -* that were copied into the child context. -*/ -public class ChildDataSource extends EODataSource -{ - private EODataSource parent; - private EOEditingContext context; - private EOClassDescription classDescription; - private NSMutableArray objects; - - /** - * Creates a child editing context for the - * specified parent's context and copies the - * specified object into the child context. - * The object must exist in the parent context. - * fetch() will return the child's object. - */ - public ChildDataSource( - EODataSource aParentSource, - Object anObject ) - { - this( aParentSource, new NSArray( (Object) anObject ) ); + * A data source that automates the process of creating a child editing context + * and copying objects from a parent context into it. Attach this data source to + * a display group that represents a "detail" or "drill-down" view. <br> + * <br> + * + * Once created, editingContext() will return the child context, and fetch() + * will return the objects that were copied into the child context. + */ +public class ChildDataSource extends EODataSource { + private EODataSource parent; + private EOEditingContext context; + private EOClassDescription classDescription; + private NSMutableArray objects; + + /** + * Creates a child editing context for the specified parent's context and copies + * the specified object into the child context. The object must exist in the + * parent context. fetch() will return the child's object. + */ + public ChildDataSource(EODataSource aParentSource, Object anObject) { + this(aParentSource, new NSArray((Object) anObject)); } - - /** - * Creates a child editing context for the - * specified parent's context and copies the - * specified objects into the child context. - * The objects must exist in the parent context. - * The order of the parent's objects in the - * collection will determine the order in - * which the child objects are returned from - * fetch(). - */ - public ChildDataSource( - EODataSource aParentSource, - Collection anObjectList ) - { - EOEditingContext parentContext = - aParentSource.editingContext(); - - parent = aParentSource; - context = new EOEditingContext( parentContext ); + + /** + * Creates a child editing context for the specified parent's context and copies + * the specified objects into the child context. The objects must exist in the + * parent context. The order of the parent's objects in the collection will + * determine the order in which the child objects are returned from fetch(). + */ + public ChildDataSource(EODataSource aParentSource, Collection anObjectList) { + EOEditingContext parentContext = aParentSource.editingContext(); + + parent = aParentSource; + context = new EOEditingContext(parentContext); //!new net.wotonomy.ui.swing.util.ObjectInspector( context ); - objects = new NSMutableArray(); - classDescription = null; - - Object o; - Object copy; - boolean allSameClass = true; - Iterator it = anObjectList.iterator(); - while ( it.hasNext() ) - { - o = it.next(); - - // determine class - if ( allSameClass == true ) - { - Class c = o.getClass(); - if ( classDescription == null ) - { - classDescription = - EOClassDescription.classDescriptionForClass( c ); - } - else - { - if ( c != classDescription.getDescribedClass() ) - { - allSameClass = false; - classDescription = null; - } - } - } - - // copy and add to list - objects.addObject( parentContext.faultForGlobalID( - parentContext.globalIDForObject( o ), context ) ); - } + objects = new NSMutableArray(); + classDescription = null; + + Object o; + Object copy; + boolean allSameClass = true; + Iterator it = anObjectList.iterator(); + while (it.hasNext()) { + o = it.next(); + + // determine class + if (allSameClass == true) { + Class c = o.getClass(); + if (classDescription == null) { + classDescription = EOClassDescription.classDescriptionForClass(c); + } else { + if (c != classDescription.getDescribedClass()) { + allSameClass = false; + classDescription = null; + } + } + } + + // copy and add to list + objects.addObject(parentContext.faultForGlobalID(parentContext.globalIDForObject(o), context)); + } } - - /** - * Returns the editing context for this data source, - * which was created in the constructor and whose - * parent is the editing context specified in the - * constructor. - */ - public EOEditingContext editingContext() - { - return context; - } - - /** - * This implementation does nothing. - */ - public void insertObject ( Object anObject ) - { + /** + * Returns the editing context for this data source, which was created in the + * constructor and whose parent is the editing context specified in the + * constructor. + */ + public EOEditingContext editingContext() { + return context; } - /** - * This implementation does nothing. - */ - public void deleteObject ( Object anObject ) - { + /** + * This implementation does nothing. + */ + public void insertObject(Object anObject) { } - /** - * Returns a List containing the objects in this - * data source. This implementation returns all - * TestObjects that have been persisted to the - * datastore in the data directory. - */ - public NSArray fetchObjects () - { - return new NSArray( (Collection) objects ); - } - - /** - * Returns a data source that is capable of - * manipulating objects of the type returned by - * applying the specified key to objects - * vended by this data source. - * This implementation forwards the call to - * the parent data source. - * @see #qualifyWithRelationshipKey - */ - public EODataSource - dataSourceQualifiedByKey ( String aKey ) - { - //FIXME: This is fundamentally broken. - // Objects vended from the returned source - // are not registered in our editing context. - // We probably need yet another utility data - // source class that would wrap another source - // and convert vended objects into a different - // context. - - return parent.dataSourceQualifiedByKey( aKey ); + /** + * This implementation does nothing. + */ + public void deleteObject(Object anObject) { + } - /** - * Restricts this data source to vend those - * objects that are associated with the specified - * key on the specified object. - * This implementation forwards the call to - * the parent data source. - */ - public void - qualifyWithRelationshipKey ( - String aKey, Object anObject ) - { - parent.qualifyWithRelationshipKey( aKey, anObject ); + /** + * Returns a List containing the objects in this data source. This + * implementation returns all TestObjects that have been persisted to the + * datastore in the data directory. + */ + public NSArray fetchObjects() { + return new NSArray((Collection) objects); } - /** - * Returns the description of the class of the - * objects that is vended by this data source, - * or null if this cannot be determined. - * This implementation returns the class of the - * objects passed to the constructor if they are - * all the same class, otherwise returns null. - */ - public EOClassDescription - classDescriptionForObjects () - { - return classDescription; - } + /** + * Returns a data source that is capable of manipulating objects of the type + * returned by applying the specified key to objects vended by this data source. + * This implementation forwards the call to the parent data source. + * + * @see #qualifyWithRelationshipKey + */ + public EODataSource dataSourceQualifiedByKey(String aKey) { + // FIXME: This is fundamentally broken. + // Objects vended from the returned source + // are not registered in our editing context. + // We probably need yet another utility data + // source class that would wrap another source + // and convert vended objects into a different + // context. + + return parent.dataSourceQualifiedByKey(aKey); + } + + /** + * Restricts this data source to vend those objects that are associated with the + * specified key on the specified object. This implementation forwards the call + * to the parent data source. + */ + public void qualifyWithRelationshipKey(String aKey, Object anObject) { + parent.qualifyWithRelationshipKey(aKey, anObject); + } + + /** + * Returns the description of the class of the objects that is vended by this + * data source, or null if this cannot be determined. This implementation + * returns the class of the objects passed to the constructor if they are all + * the same class, otherwise returns null. + */ + public EOClassDescription classDescriptionForObjects() { + return classDescription; + } } |