TestJsonReader.java

package com.example.android.baking.utilities;

import android.content.Context;
import android.util.JsonReader;
import android.util.Log;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

// Please don't use this.

public class TestJsonReader {
    private static final String LOG_TAG = TestJsonReader.class.getSimpleName();

    public static void doMockJsonTest(Context context) {

        List<MyRecipe> recipes = new ArrayList<>();
        try {
            InputStream is = context.getAssets().open("sample_json.json");
            // or from raw: InputStream is = res.openRawResource(R.raw.sample_json);
            JsonReader reader = new JsonReader(new InputStreamReader(is));
            reader.beginArray();
            while (reader.hasNext()) {
                recipes.add(readRecipe(reader));
            }
            reader.endArray();
        } catch (IOException e) {
            e.printStackTrace();
        }

        showInLog(recipes);
    }

    private static void showInLog(List<MyRecipe> recipes) {
        for (MyRecipe recipe : recipes) {
            Log.v(LOG_TAG, "recipe: " + recipe.id + " " + recipe.name + " servings:" + recipe.servings);
            Log.v(LOG_TAG, " ingredients:");
            for (MyIngredient ingredient : recipe.ingredients) {
                Log.v(LOG_TAG, "  " + ingredient.ingredient);
            }
            Log.v(LOG_TAG, " steps:");
            for (MyStep step : recipe.steps) {
                Log.v(LOG_TAG, "  " + step.shortDescription);
            }
        }
    }

    private static MyRecipe readRecipe(JsonReader reader) throws IOException {
        int id = -1;
        int servings = 0;
        String recipeName = "";
        String image = "";
        List<MyIngredient> ingredients = new ArrayList<>();
        List<MyStep> steps = new ArrayList<>();
        reader.beginObject();
        while (reader.hasNext()) {
            String name = reader.nextName();
            if (name.equals("id")) {
                id = reader.nextInt();
            } else if (name.equals("servings")) {
                servings = reader.nextInt();
            } else if (name.equals("image")) {
                image = reader.nextString();
            } else if (name.equals("name")) {
                recipeName = reader.nextString();
            } else if (name.equals("ingredients")) {
                reader.beginArray();
                while (reader.hasNext()) {
                    ingredients.add(readIngredient(reader));
                }
                reader.endArray();
            } else if (name.equals("steps")) {
                reader.beginArray();
                while (reader.hasNext()) {
                    steps.add(readStep(reader));
                }
                reader.endArray();
            } else {
                reader.skipValue();
            }
        }
        reader.endObject();
        return new MyRecipe(id, recipeName, servings, image, ingredients, steps);
    }

    private static MyIngredient readIngredient(JsonReader reader) throws IOException {
        float quantity = 0;
        String measure = "";
        String ingredientName = "";
        reader.beginObject();
        while (reader.hasNext()) {
            String name = reader.nextName();
            if (name.equals("quantity")) {
                quantity = (float) reader.nextDouble();
            } else if (name.equals("measure")) {
                measure = reader.nextString();
            } else if (name.equals("ingredient")) {
                ingredientName = reader.nextString();
            } else {
                reader.skipValue();
            }
        }
        reader.endObject();
        return new MyIngredient(quantity, measure, ingredientName);
    }

    private static MyStep readStep(JsonReader reader) throws IOException {
        int id = -1;
        String shortDescription = "";
        String description = "";
        String videoUrl = "";
        String thumbnailUrl = "";

        reader.beginObject();
        while (reader.hasNext()) {
            String name = reader.nextName();
            if (name.equals("shortDescription")) {
                shortDescription = reader.nextString();
            } else if (name.equals("description")) {
                description = reader.nextString();
            } else if (name.equals("videoUrl")) {
                videoUrl = reader.nextString();
            } else if (name.equals("thumbnailUrl")) {
                thumbnailUrl = reader.nextString();
            } else {
                reader.skipValue();
            }
        }
        reader.endObject();
        return new MyStep(id, shortDescription, description, videoUrl, thumbnailUrl);
    }
}

// data structure pojos

class MyRecipe {
    int id;
    String name;
    int servings;
    String image;
    List<MyIngredient> ingredients;
    List<MyStep> steps;

    public MyRecipe(int id, String name, int servings, String image, List<MyIngredient> ingredients, List<MyStep> steps) {
        this.id = id;
        this.name = name;
        this.servings = servings;
        this.image = image;
        this.ingredients = ingredients;
        this.steps = steps;
    }
}

class MyIngredient {
    float quantity;
    String measure;
    String ingredient;

    public MyIngredient(float quantity, String measure, String ingredient) {
        this.quantity = quantity;
        this.measure = measure;
        this.ingredient = ingredient;
    }
}

class MyStep {
    int id;
    String shortDescription;
    String description;
    String videoUrl;
    String thumbnailUrl;

    public MyStep(int id, String shortDescription, String description, String videoUrl, String thumbnailUrl) {
        this.id = id;
        this.shortDescription = shortDescription;
        this.description = description;
        this.videoUrl = videoUrl;
        this.thumbnailUrl = thumbnailUrl;
    }
}