Migrate campaigns package to kotlin (#5969)

* Convert ICampaignsView to kotlin along with simple fix

* Convert CampaignView to Kotlin

* Convert CampaignsPresenter to Kotlin

* Convert CampaignsPresenter to kotlin

---------

Co-authored-by: Nicolas Raoul <nicolas.raoul@gmail.com>

app/src/main/java/fr/free/nrw/commons/campaigns/CampaignView.java

@@ -1,118 +0,0 @@
-package fr.free.nrw.commons.campaigns;
-
-import android.content.Context;
-import android.net.Uri;
-import android.util.AttributeSet;
-import android.view.LayoutInflater;
-import android.view.View;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-
-import fr.free.nrw.commons.campaigns.models.Campaign;
-import fr.free.nrw.commons.databinding.LayoutCampaginBinding;
-import fr.free.nrw.commons.theme.BaseActivity;
-import fr.free.nrw.commons.utils.CommonsDateUtil;
-
-import fr.free.nrw.commons.utils.DateUtil;
-import java.text.ParseException;
-import java.util.Date;
-
-import fr.free.nrw.commons.R;
-import fr.free.nrw.commons.Utils;
-import fr.free.nrw.commons.contributions.MainActivity;
-import fr.free.nrw.commons.utils.SwipableCardView;
-import fr.free.nrw.commons.utils.ViewUtil;
-
-/**
- * A view which represents a single campaign
- */
-public class CampaignView extends SwipableCardView {
-    Campaign campaign;
-    private LayoutCampaginBinding binding;
-    private ViewHolder viewHolder;
-
-    public static final String CAMPAIGNS_DEFAULT_PREFERENCE = "displayCampaignsCardView";
-    public static final String WLM_CARD_PREFERENCE = "displayWLMCardView";
-
-    private String campaignPreference = CAMPAIGNS_DEFAULT_PREFERENCE;
-
-    public CampaignView(@NonNull Context context) {
-        super(context);
-        init();
-    }
-
-    public CampaignView(@NonNull Context context, @Nullable AttributeSet attrs) {
-        super(context, attrs);
-        init();
-    }
-
-    public CampaignView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
-        super(context, attrs, defStyleAttr);
-        init();
-    }
-
-    public void setCampaign(final Campaign campaign) {
-        this.campaign = campaign;
-        if (campaign != null) {
-            if (campaign.isWLMCampaign()) {
-                campaignPreference = WLM_CARD_PREFERENCE;
-            }
-            setVisibility(View.VISIBLE);
-            viewHolder.init();
-        } else {
-            this.setVisibility(View.GONE);
-        }
-    }
-
-    @Override public boolean onSwipe(final View view) {
-        view.setVisibility(View.GONE);
-        ((BaseActivity) getContext()).defaultKvStore
-            .putBoolean(CAMPAIGNS_DEFAULT_PREFERENCE, false);
-        ViewUtil.showLongToast(getContext(),
-            getResources().getString(R.string.nearby_campaign_dismiss_message));
-        return true;
-    }
-
-    private void init() {
-        binding = LayoutCampaginBinding.inflate(LayoutInflater.from(getContext()), this, true);
-        viewHolder = new ViewHolder();
-        setOnClickListener(view -> {
-            if (campaign != null) {
-                if (campaign.isWLMCampaign()) {
-                    ((MainActivity)(getContext())).showNearby();
-                } else {
-                    Utils.handleWebUrl(getContext(), Uri.parse(campaign.getLink()));
-                }
-            }
-        });
-    }
-
-    public class ViewHolder {
-        public void init() {
-            if (campaign != null) {
-                binding.ivCampaign.setImageDrawable(
-                    getResources().getDrawable(R.drawable.ic_campaign));
-
-                binding.tvTitle.setText(campaign.getTitle());
-                binding.tvDescription.setText(campaign.getDescription());
-                try {
-                    if (campaign.isWLMCampaign()) {
-                        binding.tvDates.setText(
-                            String.format("%1s - %2s", campaign.getStartDate(),
-                                campaign.getEndDate()));
-                    } else {
-                        final Date startDate = CommonsDateUtil.getIso8601DateFormatShort()
-                            .parse(campaign.getStartDate());
-                        final Date endDate = CommonsDateUtil.getIso8601DateFormatShort()
-                            .parse(campaign.getEndDate());
-                        binding.tvDates.setText(String.format("%1s - %2s", DateUtil.getExtraShortDateString(startDate),
-                            DateUtil.getExtraShortDateString(endDate)));
-                    }
-                } catch (final ParseException e) {
-                    e.printStackTrace();
-                }
-            }
-        }
-    }
-}

app/src/main/java/fr/free/nrw/commons/campaigns/CampaignView.kt

@@ -0,0 +1,121 @@
+package fr.free.nrw.commons.campaigns
+
+import android.content.Context
+import android.net.Uri
+import android.util.AttributeSet
+import android.view.LayoutInflater
+import android.view.View
+import androidx.core.content.ContextCompat
+import fr.free.nrw.commons.R
+import fr.free.nrw.commons.Utils
+import fr.free.nrw.commons.campaigns.models.Campaign
+import fr.free.nrw.commons.contributions.MainActivity
+import fr.free.nrw.commons.databinding.LayoutCampaginBinding
+import fr.free.nrw.commons.theme.BaseActivity
+import fr.free.nrw.commons.utils.CommonsDateUtil.getIso8601DateFormatShort
+import fr.free.nrw.commons.utils.DateUtil.getExtraShortDateString
+import fr.free.nrw.commons.utils.SwipableCardView
+import fr.free.nrw.commons.utils.ViewUtil.showLongToast
+import timber.log.Timber
+import java.text.ParseException
+
+/**
+ * A view which represents a single campaign
+ */
+class CampaignView : SwipableCardView {
+    private var campaign: Campaign? = null
+    private var binding: LayoutCampaginBinding? = null
+    private var viewHolder: ViewHolder? = null
+    private var campaignPreference = CAMPAIGNS_DEFAULT_PREFERENCE
+
+    constructor(context: Context) : super(context) {
+        init()
+    }
+
+    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) {
+        init()
+    }
+
+    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(
+        context, attrs, defStyleAttr) {
+        init()
+    }
+
+    fun setCampaign(campaign: Campaign?) {
+        this.campaign = campaign
+        if (campaign != null) {
+            if (campaign.isWLMCampaign) {
+                campaignPreference = WLM_CARD_PREFERENCE
+            }
+            visibility = VISIBLE
+            viewHolder!!.init()
+        } else {
+            visibility = GONE
+        }
+    }
+
+    override fun onSwipe(view: View): Boolean {
+        view.visibility = GONE
+        (context as BaseActivity).defaultKvStore.putBoolean(CAMPAIGNS_DEFAULT_PREFERENCE, false)
+        showLongToast(
+            context,
+            resources.getString(R.string.nearby_campaign_dismiss_message)
+        )
+        return true
+    }
+
+    private fun init() {
+        binding = LayoutCampaginBinding.inflate(
+            LayoutInflater.from(context), this, true
+        )
+        viewHolder = ViewHolder()
+        setOnClickListener {
+            campaign?.let {
+                if (it.isWLMCampaign) {
+                    ((context) as MainActivity).showNearby()
+                } else {
+                    Utils.handleWebUrl(context, Uri.parse(it.link))
+                }
+            }
+        }
+    }
+
+    inner class ViewHolder {
+        fun init() {
+            if (campaign != null) {
+                binding!!.ivCampaign.setImageDrawable(
+                    ContextCompat.getDrawable(binding!!.root.context, R.drawable.ic_campaign)
+                )
+                binding!!.tvTitle.text = campaign!!.title
+                binding!!.tvDescription.text = campaign!!.description
+                try {
+                    if (campaign!!.isWLMCampaign) {
+                        binding!!.tvDates.text = String.format(
+                            "%1s - %2s", campaign!!.startDate,
+                            campaign!!.endDate
+                        )
+                    } else {
+                        val startDate = getIso8601DateFormatShort().parse(
+                            campaign?.startDate
+                        )
+                        val endDate = getIso8601DateFormatShort().parse(
+                            campaign?.endDate
+                        )
+                        binding!!.tvDates.text = String.format(
+                            "%1s - %2s", getExtraShortDateString(
+                                startDate!!
+                            ), getExtraShortDateString(endDate!!)
+                        )
+                    }
+                } catch (e: ParseException) {
+                    Timber.e(e)
+                }
+            }
+        }
+    }
+
+    companion object {
+        const val CAMPAIGNS_DEFAULT_PREFERENCE: String = "displayCampaignsCardView"
+        const val WLM_CARD_PREFERENCE: String = "displayWLMCardView"
+    }
+}

app/src/main/java/fr/free/nrw/commons/campaigns/CampaignsPresenter.java

@@ -1,123 +0,0 @@
-package fr.free.nrw.commons.campaigns;
-
-import android.annotation.SuppressLint;
-
-import fr.free.nrw.commons.campaigns.models.Campaign;
-import fr.free.nrw.commons.utils.CommonsDateUtil;
-import java.text.ParseException;
-import java.util.Collections;
-import java.util.Date;
-import java.util.List;
-
-import javax.inject.Inject;
-import javax.inject.Named;
-import javax.inject.Singleton;
-
-import fr.free.nrw.commons.BasePresenter;
-import fr.free.nrw.commons.mwapi.OkHttpJsonApiClient;
-import io.reactivex.Scheduler;
-import io.reactivex.Single;
-import io.reactivex.SingleObserver;
-import io.reactivex.disposables.Disposable;
-import timber.log.Timber;
-
-import static fr.free.nrw.commons.di.CommonsApplicationModule.IO_THREAD;
-import static fr.free.nrw.commons.di.CommonsApplicationModule.MAIN_THREAD;
-
-/**
- * The presenter for the campaigns view, fetches the campaigns from the api and informs the view on
- * success and error
- */
-@Singleton
-public class CampaignsPresenter implements BasePresenter<ICampaignsView> {
-    private final OkHttpJsonApiClient okHttpJsonApiClient;
-    private final Scheduler mainThreadScheduler;
-    private final Scheduler ioScheduler;
-
-    private ICampaignsView view;
-    private Disposable disposable;
-    private Campaign campaign;
-
-    @Inject
-    public CampaignsPresenter(OkHttpJsonApiClient okHttpJsonApiClient, @Named(IO_THREAD)Scheduler ioScheduler, @Named(MAIN_THREAD)Scheduler mainThreadScheduler) {
-        this.okHttpJsonApiClient = okHttpJsonApiClient;
-        this.mainThreadScheduler=mainThreadScheduler;
-        this.ioScheduler=ioScheduler;
-    }
-
-    @Override
-    public void onAttachView(ICampaignsView view) {
-        this.view = view;
-    }
-
-    @Override public void onDetachView() {
-        this.view = null;
-        if (disposable != null) {
-            disposable.dispose();
-        }
-    }
-
-    /**
-     * make the api call to fetch the campaigns
-     */
-    @SuppressLint("CheckResult")
-    public void getCampaigns() {
-        if (view != null && okHttpJsonApiClient != null) {
-            //If we already have a campaign, lets not make another call
-            if (this.campaign != null) {
-                view.showCampaigns(campaign);
-                return;
-            }
-            Single<CampaignResponseDTO> campaigns = okHttpJsonApiClient.getCampaigns();
-            campaigns.observeOn(mainThreadScheduler)
-                .subscribeOn(ioScheduler)
-                .subscribeWith(new SingleObserver<CampaignResponseDTO>() {
-
-                    @Override public void onSubscribe(Disposable d) {
-                        disposable = d;
-                    }
-
-                    @Override public void onSuccess(CampaignResponseDTO campaignResponseDTO) {
-                        List<Campaign> campaigns = campaignResponseDTO.getCampaigns();
-                        if (campaigns == null || campaigns.isEmpty()) {
-                            Timber.e("The campaigns list is empty");
-                            view.showCampaigns(null);
-                            return;
-                        }
-                        Collections.sort(campaigns, (campaign, t1) -> {
-                            Date date1, date2;
-                            try {
-
-                                date1 = CommonsDateUtil.getIso8601DateFormatShort().parse(campaign.getStartDate());
-                                date2 = CommonsDateUtil.getIso8601DateFormatShort().parse(t1.getStartDate());
-                            } catch (ParseException e) {
-                                e.printStackTrace();
-                                return -1;
-                            }
-                            return date1.compareTo(date2);
-                        });
-                        Date campaignEndDate, campaignStartDate;
-                        Date currentDate = new Date();
-                        try {
-                            for (Campaign aCampaign : campaigns) {
-                                campaignEndDate = CommonsDateUtil.getIso8601DateFormatShort().parse(aCampaign.getEndDate());
-                                campaignStartDate = CommonsDateUtil.getIso8601DateFormatShort().parse(aCampaign.getStartDate());
-                                if (campaignEndDate.compareTo(currentDate) >= 0
-                                    && campaignStartDate.compareTo(currentDate) <= 0) {
-                                    campaign = aCampaign;
-                                    break;
-                                }
-                            }
-                        } catch (ParseException e) {
-                            e.printStackTrace();
-                        }
-                        view.showCampaigns(campaign);
-                    }
-
-                    @Override public void onError(Throwable e) {
-                        Timber.e(e, "could not fetch campaigns");
-                    }
-                });
-        }
-    }
-}

app/src/main/java/fr/free/nrw/commons/campaigns/CampaignsPresenter.kt

@@ -0,0 +1,107 @@
+package fr.free.nrw.commons.campaigns
+
+import android.annotation.SuppressLint
+import fr.free.nrw.commons.BasePresenter
+import fr.free.nrw.commons.campaigns.models.Campaign
+import fr.free.nrw.commons.di.CommonsApplicationModule
+import fr.free.nrw.commons.di.CommonsApplicationModule.IO_THREAD
+import fr.free.nrw.commons.di.CommonsApplicationModule.MAIN_THREAD
+import fr.free.nrw.commons.mwapi.OkHttpJsonApiClient
+import fr.free.nrw.commons.utils.CommonsDateUtil.getIso8601DateFormatShort
+import io.reactivex.Scheduler
+import io.reactivex.disposables.Disposable
+import timber.log.Timber
+import java.text.ParseException
+import java.text.SimpleDateFormat
+import java.util.Date
+import javax.inject.Inject
+import javax.inject.Named
+import javax.inject.Singleton
+
+/**
+ * The presenter for the campaigns view, fetches the campaigns from the api and informs the view on
+ * success and error
+ */
+@Singleton
+class CampaignsPresenter @Inject constructor(
+    private val okHttpJsonApiClient: OkHttpJsonApiClient?,
+    @param:Named(IO_THREAD) private val ioScheduler: Scheduler,
+    @param:Named(MAIN_THREAD) private val mainThreadScheduler: Scheduler
+) : BasePresenter<ICampaignsView?> {
+    private var view: ICampaignsView? = null
+    private var disposable: Disposable? = null
+    private var campaign: Campaign? = null
+
+    override fun onAttachView(view: ICampaignsView) {
+        this.view = view
+    }
+
+    override fun onDetachView() {
+        view = null
+        disposable?.dispose()
+    }
+
+    /**
+     * make the api call to fetch the campaigns
+     */
+    @SuppressLint("CheckResult")
+    fun getCampaigns() {
+        if (view != null && okHttpJsonApiClient != null) {
+            //If we already have a campaign, lets not make another call
+            if (campaign != null) {
+                view!!.showCampaigns(campaign)
+                return
+            }
+
+            okHttpJsonApiClient.campaigns
+                .observeOn(mainThreadScheduler)
+                .subscribeOn(ioScheduler)
+                .doOnSubscribe { disposable = it }
+                .subscribe({ campaignResponseDTO ->
+                    val campaigns = campaignResponseDTO.campaigns?.toMutableList()
+                    if (campaigns.isNullOrEmpty()) {
+                        Timber.e("The campaigns list is empty")
+                        view!!.showCampaigns(null)
+                    } else {
+                        sortCampaignsByStartDate(campaigns)
+                        campaign = findActiveCampaign(campaigns)
+                        view!!.showCampaigns(campaign)
+                    }
+                }, {
+                    Timber.e(it, "could not fetch campaigns")
+                })
+        }
+    }
+
+    private fun sortCampaignsByStartDate(campaigns: MutableList<Campaign>) {
+        val dateFormat: SimpleDateFormat = getIso8601DateFormatShort()
+        campaigns.sortWith(Comparator { campaign: Campaign, other: Campaign ->
+            val date1: Date?
+            val date2: Date?
+            try {
+                date1 = campaign.startDate?.let { dateFormat.parse(it) }
+                date2 = other.startDate?.let { dateFormat.parse(it) }
+            } catch (e: ParseException) {
+                Timber.e(e)
+                return@Comparator -1
+            }
+            if (date1 != null && date2 != null) date1.compareTo(date2) else -1
+        })
+    }
+
+    private fun findActiveCampaign(campaigns: List<Campaign>) : Campaign? {
+        val dateFormat: SimpleDateFormat = getIso8601DateFormatShort()
+        val currentDate = Date()
+        return try {
+            campaigns.firstOrNull {
+                val campaignStartDate = it.startDate?.let { s -> dateFormat.parse(s) }
+                val campaignEndDate = it.endDate?.let { s -> dateFormat.parse(s) }
+                campaignStartDate != null && campaignEndDate != null &&
+                        campaignEndDate >= currentDate && campaignStartDate <= currentDate
+            }
+        } catch (e: ParseException) {
+            Timber.e(e, "could not find active campaign")
+            null
+        }
+    }
+}

app/src/main/java/fr/free/nrw/commons/campaigns/ICampaignsView.java

@@ -1,11 +0,0 @@
-package fr.free.nrw.commons.campaigns;
-
-import fr.free.nrw.commons.MvpView;
-import fr.free.nrw.commons.campaigns.models.Campaign;
-
-/**
- * Interface which defines the view contracts of the campaign view
- */
-public interface ICampaignsView extends MvpView {
-    void showCampaigns(Campaign campaign);
-}

app/src/main/java/fr/free/nrw/commons/campaigns/ICampaignsView.kt

@@ -0,0 +1,11 @@
+package fr.free.nrw.commons.campaigns
+
+import fr.free.nrw.commons.MvpView
+import fr.free.nrw.commons.campaigns.models.Campaign
+
+/**
+ * Interface which defines the view contracts of the campaign view
+ */
+interface ICampaignsView : MvpView {
+    fun showCampaigns(campaign: Campaign?)
+}

app/src/test/kotlin/fr/free/nrw/commons/campaigns/CampaignsPresenterTest.kt

@@ -20,25 +20,24 @@ import kotlin.collections.ArrayList
 
 class CampaignsPresenterTest {
     @Mock
-    lateinit var okHttpJsonApiClient: OkHttpJsonApiClient
-
-    lateinit var campaignsPresenter: CampaignsPresenter
+    private lateinit var okHttpJsonApiClient: OkHttpJsonApiClient
 
     @Mock
-    internal lateinit var view: ICampaignsView
+    private lateinit var view: ICampaignsView
 
     @Mock
-    internal lateinit var campaignResponseDTO: CampaignResponseDTO
-    lateinit var campaignsSingle: Single<CampaignResponseDTO>
+    private lateinit var campaignResponseDTO: CampaignResponseDTO
 
     @Mock
-    lateinit var campaign: Campaign
-
-    lateinit var testScheduler: TestScheduler
+    private lateinit var campaign: Campaign
 
     @Mock
     private lateinit var disposable: Disposable
 
+    private lateinit var campaignsPresenter: CampaignsPresenter
+    private lateinit var campaignsSingle: Single<CampaignResponseDTO>
+    private lateinit var testScheduler: TestScheduler
+
     /**
      * initial setup, test environment
      */