PreferenceContentProvider.java

package com.eolwral.osmonitor.provider;

import com.eolwral.osmonitor.db.PreferenceDBHelper;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;

public class PreferenceContentProvider extends ContentProvider {
  private PreferenceDBHelper dbHelper = null;
  private SQLiteDatabase database = null;

  public final static String TABLE = "preference";
  public final static String KEY = "id";
  public final static String VALUE = "value";
  public static final String NOEXIST = "noExist";

  // base
  private static final String AUTHORITY = "com.eolwral.osmonitor.provider";
  private static final String SETTINGS_PATH = "settings";

  private static final int SETTINGS_METHOD = 10;

  public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/" + SETTINGS_PATH);

  // prepare UriMatcher
  private static final UriMatcher osmURIMatcher = new UriMatcher(UriMatcher.NO_MATCH);
  static {
    osmURIMatcher.addURI(AUTHORITY, SETTINGS_PATH, SETTINGS_METHOD);
  }

  @Override
  public boolean onCreate() {
    initSQLiteDB();
    return false;
  }

  private void initSQLiteDB() {
    dbHelper = new PreferenceDBHelper(getContext());
    database = dbHelper.getWritableDatabase();
  }

  @Override
  public Cursor query(Uri uri, String[] projection, String selection,
      String[] selectionArgs, String sortOrder) {

    int uriType = osmURIMatcher.match(uri);
    Cursor cursor = null;

    switch (uriType) {
    case SETTINGS_METHOD:
      cursor = database.query(TABLE, projection, selection, selectionArgs,
          null, null, sortOrder);
      break;
    default:
      throw new IllegalArgumentException("Unknown URI: " + uri);
    }

    return cursor;
  }

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

  @Override
  public Uri insert(Uri uri, ContentValues values) {

    int uriType = osmURIMatcher.match(uri);
    long recordId = 0;

    switch (uriType) {
    case SETTINGS_METHOD:
      recordId = database.insert(TABLE, null, values);
      break;
    default:
      throw new IllegalArgumentException("Unknown URI: " + uri);
    }

    // notify
    getContext().getContentResolver().notifyChange(uri, null);

    if (recordId == -1)
      return Uri.parse(SETTINGS_PATH + "/" + NOEXIST);
    return Uri.parse(SETTINGS_PATH + "/" + values.get(KEY));
  }

  @Override
  public int delete(Uri uri, String selection, String[] selectionArgs) {
    return 0;
  }

  @Override
  public int update(Uri uri, ContentValues values, String selection,
      String[] selectionArgs) {
    int uriType = osmURIMatcher.match(uri);

    int rowsUpdated = 0;
    switch (uriType) {
    case SETTINGS_METHOD:
      rowsUpdated = database.update(TABLE, values, selection, selectionArgs);
      break;
    default:
      throw new IllegalArgumentException("Unknown URI: " + uri);
    }

    // notify
    getContext().getContentResolver().notifyChange(uri, null);

    return rowsUpdated;
  }

}