diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..aa724b7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,15 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/.name b/.idea/.name
new file mode 100644
index 0000000..ecdd2b4
--- /dev/null
+++ b/.idea/.name
@@ -0,0 +1 @@
+firestore-flow
\ No newline at end of file
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
new file mode 100644
index 0000000..fb7f4a8
--- /dev/null
+++ b/.idea/compiler.xml
@@ -0,0 +1,6 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
new file mode 100644
index 0000000..8dfad51
--- /dev/null
+++ b/.idea/gradle.xml
@@ -0,0 +1,20 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
new file mode 100644
index 0000000..0380d8d
--- /dev/null
+++ b/.idea/jarRepositories.xml
@@ -0,0 +1,30 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..860da66
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,9 @@
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
new file mode 100644
index 0000000..797acea
--- /dev/null
+++ b/.idea/runConfigurations.xml
@@ -0,0 +1,10 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/README.md b/README.md
index 7511947..4de1acb 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,91 @@
-"# fireflow"
+# fireflow
+[](https://jitpack.io/#horaciocome1/fireflow) [](https://www.apache.org/licenses/LICENSE-2.0) [](https://android-arsenal.com/api?level=19)
+
+## Getting Started
+Android library that aims to hide Firebase Firestore listener implementation and expose only a Kotlin Flow of specified type. ;)
+Works for ColletionReferences, Queries, and DocumentReferences.
+
+## Pre-requisites
+Check the pre-requisites for Firebase Firestore and for Kotlin Flow on respective documentation.
+Be familiar with Kotlin Coroutines.
+Based on versions **23.0.1** and **1.4.1** of _firebase-firestore-ktx_ and _kotlinx-coroutines-play-services_ respectively
+
+## Adding to your project
+Lets start by adding a corresponding repository in your _root_ `build.gradle` file.
+```gradle
+ allprojects {
+ repositories {
+ ...
+ maven { url 'https://jitpack.io' }
+ }
+ }
+ ```
+The next task is to add the dependency to your _app_ `build.gradle` file.
+```gradle
+ dependencies {
+ ...
+ implementation 'com.github.horaciocome1:fireflow:0.0.1'
+ }
+```
+Now you ready to go. You might want to _**sync your project**_ first. ;)
+
+## How to use
+### without fireflow
+```kotlin
+ val db = FirebaseFirestore.getInstance()
+ val ref = db.collection("posts")
+ ref.addSnapshotListener { snapshot, error ->
+ if (error != null) {
+ // handle
+ } else if (snapshot != null) {
+ val posts = snapshot.toObjects(Post::class.java)
+ // set posts to UI
+ }
+ }
+```
+### with fireflow
+```kotlin
+ val db = FirebaseFirestore.getInstance()
+ db.collection("posts").getAsFlow().collect { posts ->
+ // set posts to UI
+ }
+```
+You can also read documents as flows
+```kotlin
+ val db = FirebaseFirestore.getInstance()
+ db.collection("posts").document("1")
+ .getAsFlow().collect { post ->
+ // set post to UI
+ }
+```
+
+## Troubleshooting
+There is no Java support.
+For other things please open an Issue or reach me via [hcome@pm.me](mailto:hcome@pm.me)
+
+## Licenses
+ Copyright 2021 Horácio Flávio Comé Júnior
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+### Not maintained by us
+ Firebase Firestore is a product of Google.
+ Kotlin is a product of Jetbrains.
+
+## How to contribute
+We open to suggestions of any kind.
+Email me, open pull requests, etc.
+
+## Less Boilerplate Utils
+If you want to see another utility please check my work on Recyclerview.
+[Simple RecyclerView Listener](https://github.com/horaciocome1/simple-recyclerview-listener)
+[Simple RecyclerView Adapter](https://github.com/horaciocome1/simple-recyclerview-adapter)
\ No newline at end of file
diff --git a/app/.gitignore b/app/.gitignore
new file mode 100644
index 0000000..42afabf
--- /dev/null
+++ b/app/.gitignore
@@ -0,0 +1 @@
+/build
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
new file mode 100644
index 0000000..e1a607e
--- /dev/null
+++ b/app/build.gradle
@@ -0,0 +1,44 @@
+plugins {
+ id 'com.android.application'
+ id 'kotlin-android'
+}
+
+android {
+ compileSdkVersion 30
+
+ defaultConfig {
+ applicationId "io.github.horaciocome1.firestore_flow"
+ minSdkVersion 19
+ targetSdkVersion 30
+ versionCode 1
+ versionName "1.0"
+
+ testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+ }
+
+ buildTypes {
+ release {
+ minifyEnabled false
+ proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+ }
+ }
+ compileOptions {
+ sourceCompatibility JavaVersion.VERSION_1_8
+ targetCompatibility JavaVersion.VERSION_1_8
+ }
+ kotlinOptions {
+ jvmTarget = '1.8'
+ }
+}
+
+dependencies {
+ implementation 'androidx.core:core-ktx:1.5.0'
+ implementation 'androidx.appcompat:appcompat:1.3.0'
+ implementation 'com.google.android.material:material:1.3.0'
+ implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+ implementation 'com.google.firebase:firebase-firestore-ktx:23.0.1'
+ implementation "org.jetbrains.kotlinx:kotlinx-coroutines-play-services:1.4.1"
+ testImplementation 'junit:junit:4.13.2'
+ androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+ androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+}
\ No newline at end of file
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
new file mode 100644
index 0000000..481bb43
--- /dev/null
+++ b/app/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+# http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+# public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
\ No newline at end of file
diff --git a/app/src/androidTest/java/io/github/horaciocome1/firestore_flow/ExampleInstrumentedTest.kt b/app/src/androidTest/java/io/github/horaciocome1/firestore_flow/ExampleInstrumentedTest.kt
new file mode 100644
index 0000000..0b49992
--- /dev/null
+++ b/app/src/androidTest/java/io/github/horaciocome1/firestore_flow/ExampleInstrumentedTest.kt
@@ -0,0 +1,24 @@
+package io.github.horaciocome1.firestore_flow
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+ @Test
+ fun useAppContext() {
+ // Context of the app under test.
+ val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+ assertEquals("io.github.horaciocome1.firestore_flow", appContext.packageName)
+ }
+}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..7453231
--- /dev/null
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,21 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/app/src/main/java/io/github/horaciocome1/firestore_flow/MainActivity.kt b/app/src/main/java/io/github/horaciocome1/firestore_flow/MainActivity.kt
new file mode 100644
index 0000000..3c28eee
--- /dev/null
+++ b/app/src/main/java/io/github/horaciocome1/firestore_flow/MainActivity.kt
@@ -0,0 +1,57 @@
+package io.github.horaciocome1.firestore_flow
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import com.google.firebase.firestore.FirebaseFirestore
+import com.google.firebase.firestore.Query
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.collect
+
+class MainActivity : AppCompatActivity() {
+
+ class Post
+
+ class User
+
+ class Topic
+
+ override fun onCreate(savedInstanceState: Bundle?) {
+ super.onCreate(savedInstanceState)
+ setContentView(R.layout.activity_main)
+ }
+
+ // common way
+ fun getPostsA() {
+ val db = FirebaseFirestore.getInstance()
+ val ref = db.collection("posts")
+ ref.addSnapshotListener { snapshot, error ->
+ if (error != null) {
+ // handle
+ } else if (snapshot != null) {
+ val posts = snapshot.toObjects(Post::class.java)
+ // set posts to UI
+ }
+ }
+ }
+
+ // with fireflow
+ @ExperimentalCoroutinesApi
+ suspend fun getPostsB() {
+ val db = FirebaseFirestore.getInstance()
+ db.collection("posts").getAsFlow().collect { posts ->
+ // set posts to UI
+ }
+ }
+
+ // with fireflow document
+ @ExperimentalCoroutinesApi
+ suspend fun getPost() {
+ val db = FirebaseFirestore.getInstance()
+ db.collection("posts")
+ .document("1")
+ .getAsFlow().collect { post ->
+ // set post to UI
+ }
+ }
+
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/github/horaciocome1/firestore_flow/MyFirestoreUtil.kt b/app/src/main/java/io/github/horaciocome1/firestore_flow/MyFirestoreUtil.kt
new file mode 100644
index 0000000..6019a49
--- /dev/null
+++ b/app/src/main/java/io/github/horaciocome1/firestore_flow/MyFirestoreUtil.kt
@@ -0,0 +1,64 @@
+package io.github.horaciocome1.firestore_flow
+
+import com.google.firebase.firestore.*
+import com.google.firebase.firestore.ktx.toObject
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
+
+/**
+ * returns a flow that listens to querySnapshot changes and offers them
+ * @param query need to be specified
+ */
+@ExperimentalCoroutinesApi
+inline fun getAsFlowFromQuery(query: Query): Flow> =
+ callbackFlow {
+ val listener = EventListener { snapshot, error ->
+ if (error != null) {
+ close(error)
+ return@EventListener
+ }
+ if (snapshot != null) {
+ val objets = snapshot.toObjects(T::class.java)
+ offer(objets)
+ }
+ }
+ val registration = query.addSnapshotListener(listener)
+ awaitClose { registration.remove() }
+ }
+
+/**
+ * returns a flow that listens to querySnapshot changes and offers them
+ */
+@ExperimentalCoroutinesApi
+inline fun Query.getAsFlow(): Flow> =
+ getAsFlowFromQuery(this)
+
+/**
+ * returns a flow that listens to documentSnapshot changes and offers them
+ * @param reference need to be specified
+ */
+@ExperimentalCoroutinesApi
+inline fun getAsFlowFromReference(reference: DocumentReference): Flow =
+ callbackFlow {
+ val listener = EventListener { snapshot, error ->
+ if (error != null) {
+ close(error)
+ return@EventListener
+ }
+ if (snapshot != null) {
+ val obj = snapshot.toObject()
+ offer(obj)
+ }
+ }
+ val registration = reference.addSnapshotListener(listener)
+ awaitClose { registration.remove() }
+ }
+
+/**
+ * returns a flow that listens to documentSnapshot changes and offers them
+ */
+@ExperimentalCoroutinesApi
+inline fun DocumentReference.getAsFlow(): Flow =
+ getAsFlowFromReference(this)
\ No newline at end of file
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
new file mode 100644
index 0000000..2b068d1
--- /dev/null
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -0,0 +1,30 @@
+
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+
+
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+
+
+
+
+
\ No newline at end of file
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
new file mode 100644
index 0000000..07d5da9
--- /dev/null
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -0,0 +1,170 @@
+
+
+
+
+
+
+
+
+
+
+
+
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+
+
+
+
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+
+
+
+
+
+
+
+
+
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+
+
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+
+
+
+
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000..4fc2444
--- /dev/null
+++ b/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,18 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
new file mode 100644
index 0000000..eca70cf
--- /dev/null
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,5 @@
+
+
+
+
+
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
new file mode 100644
index 0000000..eca70cf
--- /dev/null
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -0,0 +1,5 @@
+
+
+
+
+
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher.png b/app/src/main/res/mipmap-hdpi/ic_launcher.png
new file mode 100644
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new file mode 100644
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new file mode 100644
index 0000000..e96783c
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diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
new file mode 100644
index 0000000..d0edb59
--- /dev/null
+++ b/app/src/main/res/values-night/themes.xml
@@ -0,0 +1,16 @@
+
+
+
+
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000..f8c6127
--- /dev/null
+++ b/app/src/main/res/values/colors.xml
@@ -0,0 +1,10 @@
+
+
+ #FFBB86FC
+ #FF6200EE
+ #FF3700B3
+ #FF03DAC5
+ #FF018786
+ #FF000000
+ #FFFFFFFF
+
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..146d5fb
--- /dev/null
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,3 @@
+
+ firestore-flow
+
\ No newline at end of file
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
new file mode 100644
index 0000000..2a80ca1
--- /dev/null
+++ b/app/src/main/res/values/themes.xml
@@ -0,0 +1,16 @@
+
+
+
+
\ No newline at end of file
diff --git a/app/src/test/java/io/github/horaciocome1/firestore_flow/ExampleUnitTest.kt b/app/src/test/java/io/github/horaciocome1/firestore_flow/ExampleUnitTest.kt
new file mode 100644
index 0000000..eaaae28
--- /dev/null
+++ b/app/src/test/java/io/github/horaciocome1/firestore_flow/ExampleUnitTest.kt
@@ -0,0 +1,17 @@
+package io.github.horaciocome1.firestore_flow
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+ @Test
+ fun addition_isCorrect() {
+ assertEquals(4, 2 + 2)
+ }
+}
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..2f3d35b
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,27 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+ ext.kotlin_version = "1.5.10"
+ repositories {
+ google()
+ mavenCentral()
+ }
+ dependencies {
+ classpath "com.android.tools.build:gradle:4.2.1"
+ classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+
+ // NOTE: Do not place your application dependencies here; they belong
+ // in the individual module build.gradle files
+ }
+}
+
+allprojects {
+ repositories {
+ google()
+ mavenCentral()
+ jcenter() // Warning: this repository is going to shut down soon
+ }
+}
+
+task clean(type: Delete) {
+ delete rootProject.buildDir
+}
\ No newline at end of file
diff --git a/fireflow/.gitignore b/fireflow/.gitignore
new file mode 100644
index 0000000..42afabf
--- /dev/null
+++ b/fireflow/.gitignore
@@ -0,0 +1 @@
+/build
\ No newline at end of file
diff --git a/fireflow/build.gradle b/fireflow/build.gradle
new file mode 100644
index 0000000..86c08c2
--- /dev/null
+++ b/fireflow/build.gradle
@@ -0,0 +1,41 @@
+plugins {
+ id 'com.android.library'
+ id 'kotlin-android'
+}
+
+android {
+ compileSdkVersion 30
+
+ defaultConfig {
+ minSdkVersion 19
+ targetSdkVersion 30
+ versionCode 1
+ versionName "0.0.1"
+
+ testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+ consumerProguardFiles "consumer-rules.pro"
+ }
+
+ buildTypes {
+ release {
+ minifyEnabled false
+ proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+ }
+ }
+ compileOptions {
+ sourceCompatibility JavaVersion.VERSION_1_8
+ targetCompatibility JavaVersion.VERSION_1_8
+ }
+ kotlinOptions {
+ jvmTarget = '1.8'
+ }
+}
+
+dependencies {
+ implementation 'androidx.core:core-ktx:1.5.0'
+ implementation 'com.google.firebase:firebase-firestore-ktx:23.0.1'
+ implementation "org.jetbrains.kotlinx:kotlinx-coroutines-play-services:1.4.1"
+ testImplementation 'junit:junit:4.13.2'
+ androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+ androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+}
\ No newline at end of file
diff --git a/fireflow/consumer-rules.pro b/fireflow/consumer-rules.pro
new file mode 100644
index 0000000..e69de29
diff --git a/fireflow/proguard-rules.pro b/fireflow/proguard-rules.pro
new file mode 100644
index 0000000..481bb43
--- /dev/null
+++ b/fireflow/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+# http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+# public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
\ No newline at end of file
diff --git a/fireflow/src/androidTest/java/io/github/horaciocome1/fireflow/ExampleInstrumentedTest.kt b/fireflow/src/androidTest/java/io/github/horaciocome1/fireflow/ExampleInstrumentedTest.kt
new file mode 100644
index 0000000..6fd6fc1
--- /dev/null
+++ b/fireflow/src/androidTest/java/io/github/horaciocome1/fireflow/ExampleInstrumentedTest.kt
@@ -0,0 +1,24 @@
+package io.github.horaciocome1.fireflow
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+ @Test
+ fun useAppContext() {
+ // Context of the app under test.
+ val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+ assertEquals("io.github.horaciocome1.fireflow.test", appContext.packageName)
+ }
+}
\ No newline at end of file
diff --git a/fireflow/src/main/AndroidManifest.xml b/fireflow/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..79faeac
--- /dev/null
+++ b/fireflow/src/main/AndroidManifest.xml
@@ -0,0 +1,5 @@
+
+
+
+
\ No newline at end of file
diff --git a/fireflow/src/main/java/io/github/horaciocome1/fireflow/MyFirestoreUtil.kt b/fireflow/src/main/java/io/github/horaciocome1/fireflow/MyFirestoreUtil.kt
new file mode 100644
index 0000000..480db0a
--- /dev/null
+++ b/fireflow/src/main/java/io/github/horaciocome1/fireflow/MyFirestoreUtil.kt
@@ -0,0 +1,64 @@
+package io.github.horaciocome1.fireflow
+
+import com.google.firebase.firestore.*
+import com.google.firebase.firestore.ktx.toObject
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
+
+/**
+ * returns a flow that listens to querySnapshot changes and offers them
+ * @param query need to be specified
+ */
+@ExperimentalCoroutinesApi
+inline fun getAsFlowFromQuery(query: Query): Flow> =
+ callbackFlow {
+ val listener = EventListener { snapshot, error ->
+ if (error != null) {
+ close(error)
+ return@EventListener
+ }
+ if (snapshot != null) {
+ val objets = snapshot.toObjects(T::class.java)
+ offer(objets)
+ }
+ }
+ val registration = query.addSnapshotListener(listener)
+ awaitClose { registration.remove() }
+ }
+
+/**
+ * returns a flow that listens to querySnapshot changes and offers them
+ */
+@ExperimentalCoroutinesApi
+inline fun Query.getAsFlow(): Flow> =
+ getAsFlowFromQuery(this)
+
+/**
+ * returns a flow that listens to documentSnapshot changes and offers them
+ * @param reference need to be specified
+ */
+@ExperimentalCoroutinesApi
+inline fun getAsFlowFromReference(reference: DocumentReference): Flow =
+ callbackFlow {
+ val listener = EventListener { snapshot, error ->
+ if (error != null) {
+ close(error)
+ return@EventListener
+ }
+ if (snapshot != null) {
+ val obj = snapshot.toObject()
+ offer(obj)
+ }
+ }
+ val registration = reference.addSnapshotListener(listener)
+ awaitClose { registration.remove() }
+ }
+
+/**
+ * returns a flow that listens to documentSnapshot changes and offers them
+ */
+@ExperimentalCoroutinesApi
+inline fun DocumentReference.getAsFlow(): Flow =
+ getAsFlowFromReference(this)
\ No newline at end of file
diff --git a/fireflow/src/test/java/io/github/horaciocome1/fireflow/ExampleUnitTest.kt b/fireflow/src/test/java/io/github/horaciocome1/fireflow/ExampleUnitTest.kt
new file mode 100644
index 0000000..48c277d
--- /dev/null
+++ b/fireflow/src/test/java/io/github/horaciocome1/fireflow/ExampleUnitTest.kt
@@ -0,0 +1,17 @@
+package io.github.horaciocome1.fireflow
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+ @Test
+ fun addition_isCorrect() {
+ assertEquals(4, 2 + 2)
+ }
+}
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..2521752
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,19 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..f6b961f
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..c7dfd50
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Sat Jun 05 13:45:03 CAT 2021
+distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..cccdd3d
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+## Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+ ls=`ls -ld "$PRG"`
+ link=`expr "$ls" : '.*-> \(.*\)$'`
+ if expr "$link" : '/.*' > /dev/null; then
+ PRG="$link"
+ else
+ PRG=`dirname "$PRG"`"/$link"
+ fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+ echo "$*"
+}
+
+die () {
+ echo
+ echo "$*"
+ echo
+ exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+ CYGWIN* )
+ cygwin=true
+ ;;
+ Darwin* )
+ darwin=true
+ ;;
+ MINGW* )
+ msys=true
+ ;;
+ NONSTOP* )
+ nonstop=true
+ ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+ if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+ # IBM's JDK on AIX uses strange locations for the executables
+ JAVACMD="$JAVA_HOME/jre/sh/java"
+ else
+ JAVACMD="$JAVA_HOME/bin/java"
+ fi
+ if [ ! -x "$JAVACMD" ] ; then
+ die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+ fi
+else
+ JAVACMD="java"
+ which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+ MAX_FD_LIMIT=`ulimit -H -n`
+ if [ $? -eq 0 ] ; then
+ if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+ MAX_FD="$MAX_FD_LIMIT"
+ fi
+ ulimit -n $MAX_FD
+ if [ $? -ne 0 ] ; then
+ warn "Could not set maximum file descriptor limit: $MAX_FD"
+ fi
+ else
+ warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+ fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+ GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+ APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+ CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+ JAVACMD=`cygpath --unix "$JAVACMD"`
+
+ # We build the pattern for arguments to be converted via cygpath
+ ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+ SEP=""
+ for dir in $ROOTDIRSRAW ; do
+ ROOTDIRS="$ROOTDIRS$SEP$dir"
+ SEP="|"
+ done
+ OURCYGPATTERN="(^($ROOTDIRS))"
+ # Add a user-defined pattern to the cygpath arguments
+ if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+ OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+ fi
+ # Now convert the arguments - kludge to limit ourselves to /bin/sh
+ i=0
+ for arg in "$@" ; do
+ CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+ CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
+
+ if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
+ eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+ else
+ eval `echo args$i`="\"$arg\""
+ fi
+ i=$((i+1))
+ done
+ case $i in
+ (0) set -- ;;
+ (1) set -- "$args0" ;;
+ (2) set -- "$args0" "$args1" ;;
+ (3) set -- "$args0" "$args1" "$args2" ;;
+ (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+ (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+ (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+ (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+ (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+ (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+ esac
+fi
+
+# Escape application args
+save () {
+ for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+ echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+ cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..f955316
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..ba4b8f8
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,3 @@
+rootProject.name = "firestore-flow"
+include ':app'
+include ':fireflow'