ComponentControllerDelegate.java

package com.tresorit.zerokitsdk.cache;

import android.os.Bundle;

class ComponentControllerDelegate<C> {
    private static final String PRESENTER_INDEX_KEY = "presenter-index";

    private C component;
    private ComponentCache cache;
    private long componentId;
    private boolean isDestroyedBySystem;

    public void onCreate(ComponentCache cache, Bundle savedInstanceState, ComponentFactory<C> componentFactory) {
        this.cache = cache;

        if (savedInstanceState == null) componentId = cache.generateId();
        else componentId = savedInstanceState.getLong(PRESENTER_INDEX_KEY);

        component = cache.getComponent(componentId);
        if (component == null) {
            component = componentFactory.createComponent();
            cache.setComponent(componentId, component);
        }
    }

    public void onResume() {
        isDestroyedBySystem = false;
    }

    public void onSaveInstanceState(Bundle outState) {
        isDestroyedBySystem = true;
        outState.putLong(PRESENTER_INDEX_KEY, componentId);
    }

    public void onDestroy() {
        if (!isDestroyedBySystem) cache.setComponent(componentId, null);
    }

    public C getComponent() {
        return component;
    }
}