Creating entities with corresponding fields with corresponding constraints about relations, dao's and database creation file

(singletton pattern)

app/src/androidTest/java/fr/romanet/vj/apps/myrealestateagency/ExampleInstrumentedTest.java

@@ -2,13 +2,13 @@ package fr.romanet.vj.apps.myrealestateagency;
 
 import android.content.Context;
 
-import androidx.test.platform.app.InstrumentationRegistry;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
 
 /**
  * Instrumented test, which will execute on an Android device.

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/MainActivity.java

@@ -1,14 +1,48 @@
 package fr.romanet.vj.apps.myrealestateagency;
 
 import androidx.appcompat.app.AppCompatActivity;
+import android.util.Log;
+import android.view.View;
 
+import java.util.ArrayList;
+import java.util.List;
+import android.os.AsyncTask;
 import android.os.Bundle;
 
+import fr.romanet.vj.apps.myrealestateagency.Repository.MyRealEstateAgencyRepository;
+import fr.romanet.vj.apps.myrealestateagency.database.RealEstateAgencyDatabase;
+import fr.romanet.vj.apps.myrealestateagency.entities.Agency;
+import fr.romanet.vj.apps.myrealestateagency.entities.AgencyWithAgents;
+import fr.romanet.vj.apps.myrealestateagency.entities.Agent;
+
 public class MainActivity extends AppCompatActivity {
 
+    private static final String TAG = "MyActivity";
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
     }
+
+    public void insertSingleTodo(View view) {
+        Agency test1 = new Agency("AgenceOFParis");
+
+        Agency test2 = new Agency("AgenceOFMarseille");
+
+        Agent test = new Agent("Bader", "Guetari", 1);
+
+        Agent test3 = new Agent("Khalil", "Guetari", 2);
+
+        Agent test10 = new Agent("Achref", "Guetari", 1);
+
+        MyRealEstateAgencyRepository.getInstance(this).addAgency(test1);
+        MyRealEstateAgencyRepository.getInstance(this).addAgency(test2);
+        MyRealEstateAgencyRepository.getInstance(this).addAgent(test);
+        MyRealEstateAgencyRepository.getInstance(this).addAgent(test3);
+        MyRealEstateAgencyRepository.getInstance(this).addAgent(test10);
+
+        String query = "SELECT agency_id FROM agency INNER JOIN agent ON agency.agency_id = agent.agent_id WHERE agency_name =" + "AgenceOFParis" + "GROUP BY agency_name";
+        String query1 = "SELECT agency_id FROM agent INNER JOIN agency ON agency.agency_id = agent.agent_id WHERE agency_name =" + "AgenceOFParis" + "GROUP BY agency_name";
+    }
 }

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/Repository/MyRealEstateAgencyRepository.java

@@ -0,0 +1,39 @@
+package fr.romanet.vj.apps.myrealestateagency.Repository;
+
+import android.content.Context;
+
+import androidx.room.Room;
+
+import fr.romanet.vj.apps.myrealestateagency.database.RealEstateAgencyDatabase;
+import fr.romanet.vj.apps.myrealestateagency.entities.Agency;
+import fr.romanet.vj.apps.myrealestateagency.entities.Agent;
+
+public final class MyRealEstateAgencyRepository {
+    private static volatile MyRealEstateAgencyRepository instance;
+
+    public static MyRealEstateAgencyRepository getInstance(Context context)
+    {
+        if (instance == null)
+        {
+            synchronized (MyRealEstateAgencyRepository.class)
+            {
+                if (instance == null)
+                {
+                    instance = new MyRealEstateAgencyRepository(context);
+                }
+            }
+        }
+
+        return instance;
+    }
+
+    private final RealEstateAgencyDatabase realEstateAgencyDatabaseDatabase;
+
+    private MyRealEstateAgencyRepository(Context context)
+    {
+        realEstateAgencyDatabaseDatabase = Room.databaseBuilder(context, RealEstateAgencyDatabase.class, "real_estate_agency_db").allowMainThreadQueries().build();
+    }
+
+    public void addAgency(Agency agency){realEstateAgencyDatabaseDatabase.agencyDao().insertAgency(agency);}
+    public void addAgent(Agent agent){realEstateAgencyDatabaseDatabase.agentDao().insertAgent(agent);}
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/dao/AgencyDao.java

@@ -0,0 +1,19 @@
+package fr.romanet.vj.apps.myrealestateagency.dao;
+
+import androidx.room.Dao;
+import androidx.room.Insert;
+import androidx.room.Query;
+
+import java.util.List;
+
+import fr.romanet.vj.apps.myrealestateagency.entities.Agency;
+
+@Dao
+public interface AgencyDao {
+
+    @Query("SELECT * FROM agency")
+    List<Agency> getAgencyList();
+
+    @Insert
+    void insertAgency(Agency agency);
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/dao/AgencyWithAgentsDao.java

@@ -0,0 +1,17 @@
+package fr.romanet.vj.apps.myrealestateagency.dao;
+
+import androidx.room.Dao;
+import androidx.room.Query;
+import androidx.room.Transaction;
+
+import java.util.List;
+
+import fr.romanet.vj.apps.myrealestateagency.entities.AgencyWithAgents;
+
+@Dao
+public interface AgencyWithAgentsDao {
+
+    @Transaction
+    @Query("SELECT * FROM agency")
+    List<AgencyWithAgents> getAgenciesAndAgent();
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/dao/AgencyWithPropertiesDao.java

@@ -0,0 +1,16 @@
+package fr.romanet.vj.apps.myrealestateagency.dao;
+
+import androidx.room.Dao;
+import androidx.room.Query;
+import androidx.room.Transaction;
+
+import java.util.List;
+
+import fr.romanet.vj.apps.myrealestateagency.entities.AgencyWithProperties;
+
+@Dao
+public interface AgencyWithPropertiesDao {
+    @Transaction
+    @Query("SELECT * FROM agency")
+    List<AgencyWithProperties> getAgenciesAndProperties();
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/dao/AgentDao.java

@@ -0,0 +1,19 @@
+package fr.romanet.vj.apps.myrealestateagency.dao;
+
+import androidx.room.Dao;
+import androidx.room.Insert;
+import androidx.room.Query;
+
+import java.util.List;
+
+import fr.romanet.vj.apps.myrealestateagency.entities.Agent;
+
+@Dao
+public interface AgentDao {
+
+    @Query("SELECT * FROM agent")
+    List<Agent> getAgentList();
+
+    @Insert
+    void insertAgent(Agent agent);
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/dao/PropertyDao.java

@@ -0,0 +1,18 @@
+package fr.romanet.vj.apps.myrealestateagency.dao;
+
+import androidx.room.Dao;
+import androidx.room.Insert;
+import androidx.room.Query;
+
+import java.util.List;
+
+import fr.romanet.vj.apps.myrealestateagency.entities.Property;
+
+@Dao
+public interface PropertyDao {
+    @Query("SELECT * FROM property")
+    List<Property> getPropertyList();
+
+    @Insert
+    void insertProperty(Property property);
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/database/RealEstateAgencyDatabase.java

@@ -0,0 +1,29 @@
+package fr.romanet.vj.apps.myrealestateagency.database;
+
+import android.content.Context;
+
+import androidx.room.Database;
+import androidx.room.Room;
+import androidx.room.RoomDatabase;
+import androidx.room.TypeConverters;
+
+import fr.romanet.vj.apps.myrealestateagency.dao.AgencyDao;
+import fr.romanet.vj.apps.myrealestateagency.dao.AgencyWithAgentsDao;
+import fr.romanet.vj.apps.myrealestateagency.dao.AgencyWithPropertiesDao;
+import fr.romanet.vj.apps.myrealestateagency.dao.PropertyDao;
+import fr.romanet.vj.apps.myrealestateagency.entities.Agency;
+import fr.romanet.vj.apps.myrealestateagency.entities.Agent;
+import fr.romanet.vj.apps.myrealestateagency.dao.AgentDao;
+import fr.romanet.vj.apps.myrealestateagency.entities.Property;
+
+@Database(entities = {Agency.class, Agent.class, Property.class}, version = 1)
+@TypeConverters({Property.Converters.class})
+public abstract class RealEstateAgencyDatabase extends RoomDatabase {
+
+    public abstract AgentDao agentDao();
+    public abstract AgencyDao agencyDao();
+    public abstract PropertyDao propertyDao();
+    public abstract AgencyWithAgentsDao agencyWithAgentsDao();
+    public abstract AgencyWithPropertiesDao agencyWithPropertiesDaoDao();
+
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/entities/Agency.java

@@ -0,0 +1,30 @@
+package fr.romanet.vj.apps.myrealestateagency.entities;
+
+import androidx.room.ColumnInfo;
+import androidx.room.Entity;
+import androidx.room.Index;
+import androidx.room.PrimaryKey;
+
+//Parent class of agent (indeed, zero or many agents can work in an agency)
+@Entity(tableName = "agency",
+        indices = {@Index("agency_id"),
+                @Index(value = {"agency_name"}, unique = true)})
+public class Agency {
+
+    @ColumnInfo(name = "agency_id")
+    @PrimaryKey(autoGenerate = true)
+    public int agencyId;
+
+    @ColumnInfo(name = "agency_name")
+    public String agencyName;
+
+    public Agency(String agencyName)
+    {
+        agencyId = 0;
+        this.agencyName = agencyName;
+    }
+
+    public int getAgencyId() {
+        return agencyId;
+    }
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/entities/AgencyWithAgents.java

@@ -0,0 +1,23 @@
+package fr.romanet.vj.apps.myrealestateagency.entities;
+
+import androidx.room.Embedded;
+import androidx.room.Relation;
+
+import java.util.List;
+
+public class AgencyWithAgents {
+    @Embedded public Agency agency;
+    @Relation(
+            parentColumn = "agency_id",
+            entityColumn = "agency_employer_id"
+    )
+    public List<Agent> agents;
+
+    public Agency getAgency() {
+        return agency;
+    }
+
+    public List<Agent> getAgents() {
+        return agents;
+    }
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/entities/AgencyWithProperties.java

@@ -0,0 +1,15 @@
+package fr.romanet.vj.apps.myrealestateagency.entities;
+
+import androidx.room.Embedded;
+import androidx.room.Relation;
+
+import java.util.List;
+
+public class AgencyWithProperties {
+    public int agency_id;
+    @Relation(
+            parentColumn = "agency_id",
+            entityColumn = "belongs_agency_id"
+    )
+    public List<AgencyWithProperties> agents;
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/entities/Agent.java

@@ -0,0 +1,45 @@
+package fr.romanet.vj.apps.myrealestateagency.entities;
+
+import androidx.room.ColumnInfo;
+import androidx.room.Entity;
+import androidx.room.ForeignKey;
+import androidx.room.Index;
+import androidx.room.PrimaryKey;
+
+import static androidx.room.ForeignKey.CASCADE;
+
+//Child class of Agency (indeed, an agent work only in one agency)
+@Entity(tableName = "agent",
+        indices = {@Index(value = {"agent_first_name", "agent_last_name"}, unique = true)},
+        foreignKeys = @ForeignKey(entity = Agency.class,
+                parentColumns = "agency_id",
+                childColumns = "agency_employer_id",
+                onDelete = CASCADE))
+public class Agent {
+
+    @ColumnInfo(name = "agent_id")
+    @PrimaryKey(autoGenerate = true)
+    public int agentId;
+
+    @ColumnInfo(name = "agent_first_name")
+    public String agentFirstName;
+
+    @ColumnInfo(name = "agent_last_name")
+    public String agentLastName;
+
+    @ColumnInfo(name = "agency_employer_id", index = true)
+    public int agencyEmployerId;
+
+    public Agent(String agentFirstName, String agentLastName, int agencyEmployerId)
+    {
+        agentId = 0;
+        this.agentFirstName = agentFirstName;
+        this.agentLastName = agentLastName;
+        this.agencyEmployerId = agencyEmployerId;
+    }
+
+    public String getAgentName()
+    {
+        return agentFirstName;
+    }
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/entities/Property.java

@@ -0,0 +1,66 @@
+package fr.romanet.vj.apps.myrealestateagency.entities;
+
+import androidx.room.ColumnInfo;
+import androidx.room.Embedded;
+import androidx.room.Entity;
+import androidx.room.ForeignKey;
+import androidx.room.Index;
+import androidx.room.PrimaryKey;
+import androidx.room.TypeConverter;
+
+import java.sql.Date;
+
+import static androidx.room.ForeignKey.CASCADE;
+
+@Entity(tableName = "property",
+        indices = {@Index(value = "property_id") ,@Index(value = {"address","longitude", "latitude"}, unique = true)},
+        foreignKeys = @ForeignKey(entity = Agency.class,
+                parentColumns = "agency_id",
+                childColumns = "belongs_agency_id",
+                onDelete = CASCADE))
+public class Property {
+
+    @PrimaryKey(autoGenerate = true)
+    @ColumnInfo(name = "property_id")
+    public int propertyId;
+
+    @ColumnInfo(name = "description")
+    public String description;
+
+    @ColumnInfo(name = "address")
+    public String address;
+
+    @ColumnInfo(name = "longitude")
+    public long longitude;
+
+    @ColumnInfo(name = "latitude")
+    public long latitude;
+
+   //@Embedded
+    //public PropertyStatue propertyStatue;
+
+    @ColumnInfo(name = "belongs_agency_id")
+    public int belongsToAgencyId;
+
+    public Property(String description, String address, long longitude, long latitude)
+    {
+        propertyId = 0;
+        this.description = description;
+        this.address = address;
+        this.longitude = longitude;
+        this.latitude = latitude;
+    }
+
+    public static class Converters  {
+
+        @TypeConverter
+        public static Date toDate(Long dateLong){
+            return dateLong == null ? null: new Date(dateLong);
+        }
+
+        @TypeConverter
+        public static Long fromDate(Date date){
+            return date == null ? null : date.getTime();
+        }
+    }
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/entities/PropertyStatue.java

@@ -0,0 +1,24 @@
+package fr.romanet.vj.apps.myrealestateagency.entities;
+
+import androidx.annotation.Nullable;
+import androidx.room.ColumnInfo;
+import androidx.room.Embedded;
+
+import java.sql.Date;
+
+public class PropertyStatue{
+
+    @ColumnInfo(name = "statue_sale")
+    public boolean statueSale;
+
+    @ColumnInfo(name = "sold_date")
+    @Nullable
+    public Date soldDate;
+
+    @ColumnInfo(name = "price")
+    public double price;
+
+    @Embedded
+    public PropertyType propertyType;
+
+}

app/src/main/java/fr/romanet/vj/apps/myrealestateagency/entities/PropertyType.java

@@ -0,0 +1,16 @@
+package fr.romanet.vj.apps.myrealestateagency.entities;
+
+import androidx.room.ColumnInfo;
+
+public class PropertyType {
+
+    @ColumnInfo(name = "type_description")
+    public String typeDescription;
+
+    @ColumnInfo(name = "number_rooms")
+    public int numberRooms;
+
+    @ColumnInfo(name = "surface_area")
+    public float surfaceArea;
+
+}

app/src/main/res/layout/activity_main.xml

@@ -7,6 +7,7 @@
     tools:context=".MainActivity">
 
     <TextView
+        android:id="@+id/textView"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Hello World!"
@@ -15,4 +16,16 @@
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <Button
+        android:id="@+id/buttonZ"
+        android:layout_width="95dp"
+        android:layout_height="56dp"
+        android:layout_marginBottom="204dp"
+        android:onClick="insertSingleTodo"
+        android:text="Button"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="@+id/textView"
+        app:layout_constraintHorizontal_bias="0.526"
+        app:layout_constraintStart_toStartOf="@+id/textView" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>