com.fabernovel.alertevoirie.data.CategoryProvider.java Source code

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Here is the source code for com.fabernovel.alertevoirie.data.CategoryProvider.java

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/**
 * This file is part of the Alerte Voirie project.
 * 
 * Copyright (C) 2010-2011 C4M PROD
 * 
 * Alerte Voirie is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Alerte Voirie is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alerte Voirie.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
package com.fabernovel.alertevoirie.data;

import java.io.DataInputStream;
import java.io.IOException;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.net.Uri;
import android.provider.BaseColumns;
import android.util.Log;

import com.fabernovel.alertevoirie.R;
import com.fabernovel.alertevoirie.entities.Constants;
import com.fabernovel.alertevoirie.entities.JsonData;
import com.fabernovel.alertevoirie.utils.JSONCursor;

public class CategoryProvider extends ContentProvider {

    private static final int CATEGORIES = 1;
    private static final int CATEGORIES_ID = 2;
    private static final int CATEGORY_ID = 3;

    private static UriMatcher uriMatcher = null;

    public static final String AUTHORITY = "com.fabernovel.alertevoirie.dataprovider.advice";

    public static JSONObject categories;

    @Override
    public boolean onCreate() {
        // load json data
        DataInputStream in = new DataInputStream(getContext().getResources().openRawResource(R.raw.categories));
        try {
            byte[] buffer = new byte[in.available()];
            in.read(buffer);
            categories = (JSONObject) new JSONTokener(new String(buffer)).nextValue();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            Log.e("Alerte Voirie", "JSON error", e);
        }
        return true;
    }

    @Override
    public String getType(Uri uri) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        throw new UnsupportedOperationException("Read only provider");
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        throw new UnsupportedOperationException("Read only provider");
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        JSONArray array = new JSONArray();
        try {
            String categoryId = JsonData.VALUE_NULL;
            switch (uriMatcher.match(uri)) {
            case CATEGORIES_ID:
                categoryId = uri.getLastPathSegment();
                //$FALL-THROUGH$
            case CATEGORIES:
                JSONObject parent = categories.getJSONObject(categoryId);
                if (parent.has(JsonData.PARAM_CATEGORY_CHILDREN)) {
                    JSONArray subset = parent.getJSONArray(JsonData.PARAM_CATEGORY_CHILDREN);
                    for (int i = 0; i < subset.length(); i++) {
                        JSONObject obj = categories.getJSONObject(subset.getString(i));
                        obj.put(BaseColumns._ID, (long) Integer.valueOf(subset.getString(i)));
                        array.put(obj);
                    }
                }
                break;

            case CATEGORY_ID:
                categoryId = uri.getLastPathSegment();
                array.put(categories.getJSONObject(categoryId));
                Log.d(Constants.PROJECT_TAG, "category returned = " + categories.getJSONObject(categoryId));
                break;

            default:
                return null;
            }

        } catch (NumberFormatException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }
        Cursor c = new JSONCursor(array, projection);
        if (c != null)
            c.setNotificationUri(getContext().getContentResolver(), uri);
        return c;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        throw new UnsupportedOperationException("Read only provider");
    }

    static {
        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        uriMatcher.addURI(AUTHORITY, "categories", CATEGORIES);
        uriMatcher.addURI(AUTHORITY, "categories/*", CATEGORIES_ID);
        uriMatcher.addURI(AUTHORITY, "category/*", CATEGORY_ID);
    }
}