feat(model): Log, DataPoint, LogAdapter

app/src/main/java/fr/plnech/lifelogger/model/DataPoint.kt

+package fr.plnech.lifelogger.model
+
+import java.util.*
+import kotlin.collections.HashMap
+
+private const val NONE: Int = Int.MIN_VALUE
+
+data class DataPoint(val date: Date = Date(), private val metadata: HashMap<String, Any> = HashMap()) {
+
+    constructor(name: String, count: Int = NONE) : this() {
+        metadata["name"] = name
+        metadata["count"] = count
+    }
+
+    private val name: String
+        get() = metadata["name"] as String
+
+    private val count: Int?
+        get() = metadata["count"].let {
+            if (it == NONE) null else it
+        }  as Int?
+
+    override fun toString(): String {
+        val b = StringBuilder(name)
+        count?.let { b.append("($count)")}
+        return b.toString()
+    }
+}
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app/src/main/java/fr/plnech/lifelogger/model/Log.kt

+package fr.plnech.lifelogger.model
+
+class Log(val name: String, private val dataPoints : ArrayList<DataPoint> = ArrayList()) {
+
+    fun addPoint(dataPoint: DataPoint) {
+        dataPoints.add(dataPoint)
+    }
+
+    override fun toString(): String {
+        val b = StringBuilder("$name: ")
+        dataPoints.forEach({b.append(it).append(" | ")})
+        return b.removeSuffix("| ").toString()
+    }
+}
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app/src/main/java/fr/plnech/lifelogger/model/LogAdapter.kt

+package fr.plnech.lifelogger.model
+
+import android.app.Activity
+import android.content.Context
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.BaseAdapter
+import android.widget.TextView
+
+class LogAdapter(private var activity : Activity, private var logs : List<Log>) : BaseAdapter() {
+    override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
+        val view: View
+        val viewHolder: ViewHolder
+        if (convertView == null) {
+            val inflater = activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
+            view = inflater.inflate(android.R.layout.simple_list_item_1, null)
+            viewHolder = ViewHolder(view)
+            view?.tag = viewHolder
+        } else {
+            view = convertView
+            viewHolder = view.tag as ViewHolder
+        }
+
+        var log = logs[position]
+        viewHolder.text1.text = log.toString()
+
+        return view
+    }
+
+    override fun getItem(position: Int): Any {
+        return logs[position]
+    }
+
+    override fun getItemId(position: Int): Long {
+        return position.toLong()
+    }
+
+    override fun getCount(): Int {
+        return logs.size
+    }
+
+    class ViewHolder(row: View) {
+        var text1: TextView = row.findViewById(android.R.id.text1)!!
+    }
+}
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app/src/main/java/fr/plnech/lifelogger/model/LogViewModel.java

+package fr.plnech.lifelogger.model;
+
+import android.arch.lifecycle.LiveData;
+import android.arch.lifecycle.MutableLiveData;
+import android.arch.lifecycle.ViewModel;
+
+import java.util.List;
+
+public class LogViewModel extends ViewModel {
+    private MutableLiveData<List<Log>> logs;
+    public LiveData<List<Log>> getLogs() {
+        if (logs == null) {
+            logs = new MutableLiveData<>();
+            loadLogs();
+        }
+        return logs;
+    }
+
+    private void loadLogs() {
+        // TODO: Fetch from Room asyncronously.
+    }
+}