GlobalConfig and create node data storage

src/pandroid/app/src/main/AndroidManifest.xml

@@ -11,6 +11,7 @@
         android:glEsVersion="0x0030001"/>
 
     <application
+        android:name=".app.PandaApplication"
         android:requestLegacyExternalStorage="true"
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"

src/pandroid/app/src/main/java/com/panda3ds/pandroid/app/PandaApplication.java

@@ -0,0 +1,21 @@
+package com.panda3ds.pandroid.app;
+
+import android.app.Application;
+import android.content.Context;
+
+import com.panda3ds.pandroid.data.config.GlobalConfig;
+
+public class PandaApplication extends Application {
+    private static Context appContext;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        appContext = this;
+        GlobalConfig.initialize();
+    }
+
+    public static Context getAppContext() {
+        return appContext;
+    }
+}

src/pandroid/app/src/main/java/com/panda3ds/pandroid/data/config/GlobalConfig.java

@@ -0,0 +1,61 @@
+package com.panda3ds.pandroid.data.config;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+import com.panda3ds.pandroid.app.PandaApplication;
+import com.panda3ds.pandroid.utils.Constants;
+
+import java.io.Serializable;
+
+public class GlobalConfig {
+    private static SharedPreferences data;
+
+    public static void initialize() {
+        data = PandaApplication.getAppContext()
+                .getSharedPreferences(Constants.PREF_GLOBAL_CONFIG, Context.MODE_PRIVATE);
+    }
+
+    private static <T extends Serializable> T get(Key<T> key) {
+        Serializable value;
+        if (key.defValue instanceof String) {
+            value = data.getString(key.name, (String) key.defValue);
+        } else if (key.defValue instanceof Integer) {
+            value = data.getInt(key.name, (int) key.defValue);
+        } else if (key.defValue instanceof Boolean) {
+            value = data.getBoolean(key.name, (Boolean) key.defValue);
+        } else if (key.defValue instanceof Long) {
+            value = data.getLong(key.name, (Long) key.defValue);
+        } else {
+            value = data.getFloat(key.name, ((Number) key.defValue).floatValue());
+        }
+        return (T) value;
+    }
+
+    //Need synchronized why SharedPreferences don't support aysnc write
+    private static synchronized <T extends Serializable> void set(Key<T> key, T value) {
+        if (value instanceof String) {
+            data.edit().putString(key.name, (String) value).apply();
+        } else if (value instanceof Integer) {
+            data.edit().putInt(key.name, (Integer) value).apply();
+        } else if (value instanceof Boolean) {
+            data.edit().putBoolean(key.name, (Boolean) value).apply();
+        } else if (value instanceof Long) {
+            data.edit().putLong(key.name, (Long) value).apply();
+        } else if (value instanceof Float) {
+            data.edit().putFloat(key.name, (Float) value).apply();
+        } else {
+            throw new IllegalArgumentException("Invalid global config value instance");
+        }
+    }
+
+    private static class Key<T extends Serializable> {
+        private final String name;
+        private final T defValue;
+
+        private Key(String name, T defValue) {
+            this.name = name;
+            this.defValue = defValue;
+        }
+    }
+}

src/pandroid/app/src/main/java/com/panda3ds/pandroid/data/node/Caster.java

@@ -0,0 +1,40 @@
+package com.panda3ds.pandroid.data.node;
+
+/**
+ * JAVA THINGS:
+ * Java allow cast primary (int, double, float and long)
+ * but crash on cast object number why!!
+ **/
+class Caster {
+    public static int intValue(Object value){
+        if (value instanceof Number){
+            return ((Number)value).intValue();
+        } else {
+            return Integer.parseInt((String) value);
+        }
+    }
+
+    public static float floatValue(Object value){
+        if (value instanceof Number){
+            return ((Number)value).floatValue();
+        } else {
+            return Float.parseFloat((String) value);
+        }
+    }
+
+    public static long longValue(Object value){
+        if (value instanceof Number){
+            return ((Number)value).longValue();
+        } else {
+            return Long.parseLong((String) value);
+        }
+    }
+
+    public static double doubleValue(Object value){
+        if (value instanceof Number){
+            return ((Number)value).doubleValue();
+        } else {
+            return Double.parseDouble((String) value);
+        }
+    }
+}

src/pandroid/app/src/main/java/com/panda3ds/pandroid/data/node/NodeArray.java

@@ -0,0 +1,133 @@
+package com.panda3ds.pandroid.data.node;
+
+import androidx.annotation.NonNull;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+public class NodeArray extends NodeBase {
+    public static final String EMPTY_SOURCE = "[]";
+
+    private final ArrayList<Object> list = new ArrayList<>();
+
+    NodeArray(JSONArray array) {
+        init(array);
+    }
+
+    public NodeArray() {
+        this(EMPTY_SOURCE);
+    }
+
+    public NodeArray(String source) {
+        try {
+            init(new JSONArray(source));
+        } catch (JSONException e) {
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    private void init(JSONArray array) {
+        try {
+            for (int i = 0; i < array.length(); i++) {
+                Object item = array.get(i);
+                if (item instanceof JSONArray) {
+                    item = new NodeArray((JSONArray) item);
+                    ((NodeArray) item).setParent(this);
+                } else if (item instanceof JSONObject) {
+                    item = new NodeObject((JSONObject) item);
+                    ((NodeObject) item).setParent(this);
+                }
+                list.add(item);
+            }
+        } catch (Exception e) {
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    private void add(Object obj) {
+        list.add(obj);
+        changed();
+    }
+
+    public String getString(int index) {
+        return (String) list.get(index);
+    }
+
+    public int getInteger(int index) {
+        return Caster.intValue(list.get(index));
+    }
+
+    public long getLong(int index) {
+        return Caster.longValue(list.get(index));
+    }
+
+    public boolean getBoolean(int index) {
+        return (boolean) list.get(index);
+    }
+
+    public double getDouble(int index) {
+        return Caster.doubleValue(list.get(index));
+    }
+
+    public NodeArray getArray(int index) {
+        return (NodeArray) list.get(index);
+    }
+
+    public NodeObject getObject(int index) {
+        return (NodeObject) list.get(index);
+    }
+
+    public void add(String val) {
+        list.add(val);
+    }
+
+    public void add(int val) {
+        add((Object) val);
+    }
+
+    public void add(long val) {
+        add((Object) val);
+    }
+
+    public void add(double val) {
+        add((Object) val);
+    }
+
+    public void add(boolean val) {
+        add((Object) val);
+    }
+
+    public void add(NodeBase val) {
+        add((Object) val);
+    }
+
+    public int getSize() {
+        return list.size();
+    }
+
+    @NonNull
+    @Override
+    public String toString() {
+        try {
+            return ((JSONArray) buildValue()).toString(4);
+        } catch (JSONException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    protected Object buildValue() {
+        JSONArray array = new JSONArray();
+        for (Object obj : list) {
+            if (obj instanceof NodeBase) {
+                array.put(((NodeBase) obj).buildValue());
+            } else {
+                array.put(obj);
+            }
+        }
+        return array;
+    }
+}

src/pandroid/app/src/main/java/com/panda3ds/pandroid/data/node/NodeBase.java

@@ -0,0 +1,34 @@
+package com.panda3ds.pandroid.data.node;
+
+import androidx.annotation.NonNull;
+
+import com.panda3ds.pandroid.lang.Function;
+
+abstract class NodeBase {
+    private NodeBase parent = null;
+    private Function<NodeBase> changeListener;
+
+    protected void setParent(NodeBase parent) {
+        this.parent = parent;
+    }
+
+    protected void changed() {
+        if (parent != null)
+            parent.changed();
+        if (changeListener != null)
+            changeListener.run(this);
+    }
+
+    public <T extends NodeBase> void setChangeListener(Function<T> listener) {
+        changeListener = val -> listener.run((T) val);
+    }
+
+    protected NodeBase getParent() {
+        return parent;
+    }
+
+    protected abstract Object buildValue();
+
+    @NonNull
+    public abstract String toString();
+}