Package com.example.skeddly.business.database

Class DatabaseHandler

java.lang.Object

com.example.skeddly.business.database.DatabaseHandler

public class DatabaseHandler
extends Object

Handles edits and realtime updates to the realtime DB in Firebase

Constructor Summary

Constructors

Constructor	Description
DatabaseHandler()

Method Summary

Modifier and Type	Method	Description
void	customSerializer(com.google.firebase.firestore.DocumentReference ref, DatabaseObject object)	Serializes a DatabaseObject into the DB
void	customUnserializer(com.google.firebase.firestore.DocumentReference ref, DatabaseObject object)	Unserializes a DatabaseObject from the DB
com.google.firebase.firestore.CollectionReference	getEventsPath()	Returns a CollectionReference pointing to events
<T extends DatabaseObject> com.google.android.gms.tasks.Task<DatabaseObjects<T>>	getNodeChildren(com.google.firebase.firestore.CollectionReference ref, Class<T> classType)	Gets the children of a node in the database.
com.google.android.gms.tasks.Task<ArrayList<String>>	getNodeChildren(com.google.firebase.firestore.DocumentReference ref, String internalName)	Gets the children of a node in the database.
com.google.firebase.firestore.CollectionReference	getNotificationsPath()	Returns a CollectionReference pointing to notifications
com.google.firebase.firestore.CollectionReference	getPath(String path)	Returns a CollectionReference pointing to the specified path
com.google.firebase.firestore.CollectionReference	getTicketsPath()	Returns a CollectionReference pointing to tickets
com.google.firebase.firestore.CollectionReference	getUsersPath()	Returns a CollectionReference pointing to users
<T extends DatabaseObject> com.google.firebase.firestore.ListenerRegistration	iterableListen(com.google.firebase.firestore.CollectionReference ref, Class<T> classType, IterableListenUpdate callback)	Listens to if a group of values are updated in a specific part of the DB
<T extends DatabaseObject> com.google.firebase.firestore.ListenerRegistration	singleListen(com.google.firebase.firestore.DocumentReference ref, Class<T> classType, SingleListenUpdate<T> callback)	Listens to if a single value is updated in a specific part of the DB

Methods inherited from class java.lang.Object

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

Constructor Details

DatabaseHandler

public DatabaseHandler()

Method Details

customSerializer

public void customSerializer(com.google.firebase.firestore.DocumentReference ref,
 DatabaseObject object)

Serializes a DatabaseObject into the DB

Parameters:

ref - The DocumentReference to serialize to

object - The DatabaseObject to serialize

See Also:

• DocumentReference
• DatabaseObject

customUnserializer

public void customUnserializer(com.google.firebase.firestore.DocumentReference ref,
 DatabaseObject object)
                        throws InvocationTargetException,
IllegalAccessException

Unserializes a DatabaseObject from the DB

Parameters:

ref - The DocumentReference to unserialize

object - The DatabaseObject to unserialize

Throws:

InvocationTargetException

IllegalAccessException

See Also:

• DocumentReference
• DatabaseObject

getNodeChildren

public com.google.android.gms.tasks.Task<ArrayList<String>> getNodeChildren(com.google.firebase.firestore.DocumentReference ref,
 String internalName)

Gets the children of a node in the database.

Parameters:

ref - The DocumentReference reference of the node

internalName - The field in the document where all the IDs are stored.

Returns:

An asynchronous task that gets an arraylist of strings

See Also:

• CollectionReference

getNodeChildren

public <T extends DatabaseObject>
com.google.android.gms.tasks.Task<DatabaseObjects<T>> getNodeChildren(com.google.firebase.firestore.CollectionReference ref,
 Class<T> classType)

Gets the children of a node in the database.

Parameters:

ref - The CollectionReference of the node that contains the children.

Returns:

An asynchronous task that gets an arraylist of database objects

singleListen

public <T extends DatabaseObject>
com.google.firebase.firestore.ListenerRegistration singleListen(com.google.firebase.firestore.DocumentReference ref,
 Class<T> classType,
 SingleListenUpdate<T> callback)

Listens to if a single value is updated in a specific part of the DB

Type Parameters:

T - The DatabaseObject to serialize to (generic)

Parameters:

ref - The DocumentReference for the path to watch

classType - The DatabaseObject to serialize to (generic)

callback - The SingleListenUpdate to use as a callback for when data is changed

See Also:

• DocumentReference
• DatabaseObject

iterableListen

public <T extends DatabaseObject>
com.google.firebase.firestore.ListenerRegistration iterableListen(com.google.firebase.firestore.CollectionReference ref,
 Class<T> classType,
 IterableListenUpdate callback)

Listens to if a group of values are updated in a specific part of the DB

Type Parameters:

T - The DatabaseObject to serialize to (generic)

Parameters:

ref - The DocumentReference for the path to watch

classType - The DatabaseObject to serialize to (generic)

callback - The SingleListenUpdate to use as a callback for when data is changed

See Also:

• DocumentReference
• DatabaseObject

getUsersPath

public com.google.firebase.firestore.CollectionReference getUsersPath()

Returns a CollectionReference pointing to users

Returns:

A CollectionReference pointing to users

See Also:

• CollectionReference

getEventsPath

public com.google.firebase.firestore.CollectionReference getEventsPath()

Returns a CollectionReference pointing to events

Returns:

A CollectionReference pointing to events

See Also:

• CollectionReference

getTicketsPath

public com.google.firebase.firestore.CollectionReference getTicketsPath()

Returns a CollectionReference pointing to tickets

Returns:

A CollectionReference pointing to tickets

See Also:

• CollectionReference

getNotificationsPath

public com.google.firebase.firestore.CollectionReference getNotificationsPath()

Returns a CollectionReference pointing to notifications

Returns:

A CollectionReference pointing to notifications

See Also:

• CollectionReference

getPath

public com.google.firebase.firestore.CollectionReference getPath(String path)

Returns a CollectionReference pointing to the specified path

Returns:

A CollectionReference pointing to the specified path

See Also:

• CollectionReference