Android Open Source - androidTileMapEditor Tile Map Content Provider

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2012 Luca Santarelli/* ww  w  .j  a  va 2  s  . c o  m*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package it.sineo.android.tileMapEditor;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FilenameFilter;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.net.Uri;
import android.util.Log;

public class TileMapContentProvider extends ContentProvider {
  private final static String TAG = TileMapContentProvider.class.getSimpleName();
  /*
   * Private database fields
   */
  private UriMatcher uriMatcher;
  private DatabaseHelper dbHelper;

  @Override
  public boolean onCreate() {
    uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
    uriMatcher.addURI(C.AUTHORITY_MAP, C.CONTENT_MAP_BASE, C.MATCH_MAPS);
    uriMatcher.addURI(C.AUTHORITY_MAP, C.CONTENT_MAP_BASE + "/#", C.MATCH_MAP_ID);

    dbHelper = new DatabaseHelper(getContext());

    return true;
  }

  @Override
  public String getType(Uri uri) {
    switch (uriMatcher.match(uri)) {
      case C.MATCH_MAPS:
      case C.MATCH_MAP_ID:
        return C.CONTENT_TYPE_MAP;
      default:
        throw new IllegalArgumentException("Unknown URI: " + uri);
    }
  }

  @Override
  public int delete(Uri uri, String where, String[] whereArgs) {
    int uriType = uriMatcher.match(uri);
    if (uriType == C.MATCH_MAPS || uriType == C.MATCH_MAP_ID) {
      String mapId = null;
      SQLiteDatabase db = dbHelper.getWritableDatabase();
      if (uriType == C.MATCH_MAP_ID) {
        /*
         * Single map: use WHERE clause; ensure the given argument is a long
         * through parse+toString
         */
        mapId = Long.decode(uri.getLastPathSegment()).toString();
        where = TileMap.Columns.KEY_ROWID + "=?";
        whereArgs = new String[] {
          mapId
        };
      } else {
        /* Whole database */
        where = null;
        whereArgs = null;
        mapId = null;
      }
      int deleted = db.delete(C.DATABASE_TABLE, where, whereArgs);
      // db.close();
      /* Thumbnails */
      File thumbDir = Util.getExternalThumbnailsDirectory();
      if (mapId == null) {
        File[] thumbNails = thumbDir.listFiles(new FilenameFilter() {
          @Override
          public boolean accept(File dir, String filename) {
            return filename.startsWith("tn_");
          }
        });
        for (File thumbFile : thumbNails) {
          if (thumbFile.exists())
            thumbFile.delete();
        }
      } else {
        File thumbFile = new File(thumbDir, "tn_" + mapId + ".png");
        if (thumbFile.exists()) {
          thumbFile.delete();
        }
      }
      getContext().getContentResolver().notifyChange(uri, null);
      // getContext().getContentResolver().notifyChange(C.CONTENT_URI, null);
      return deleted;
    } else {
      throw new IllegalArgumentException("Unknown URI: " + uri);
    }
  }

  @Override
  public Uri insert(Uri uri, ContentValues initialValues) {
    if (uriMatcher.match(uri) == C.MATCH_MAPS) {
      ContentValues dbValues = new ContentValues();
      dbValues.put(TileMap.Columns.KEY_NAME, initialValues.getAsString(TileMap.Columns.KEY_NAME));
      dbValues.put(TileMap.Columns.KEY_JSON_DATA, initialValues.getAsString(TileMap.Columns.KEY_JSON_DATA));
      dbValues.put(TileMap.Columns.KEY_LAST_UPDATE, System.currentTimeMillis());

      SQLiteDatabase db = dbHelper.getWritableDatabase();
      long mapId = db.insert(C.DATABASE_TABLE, null, dbValues);
      Uri newUri = Uri.withAppendedPath(C.CONTENT_URI, Long.toString(mapId));
      /* Create the thumbnail on the filesystem */
      try {
        File thumbFile = new File(Util.getExternalThumbnailsDirectory(), "tn_" + mapId + ".png");
        FileOutputStream fos = new FileOutputStream(thumbFile);
        fos.write(initialValues.getAsByteArray(TileMap.Columns.KEY_THUMB));
        fos.close();
      } catch (Exception ex) {
        ex.printStackTrace();
      }

      getContext().getContentResolver().notifyChange(uri, null);
      return newUri;
    } else {
      throw new IllegalArgumentException("Unknown URI: " + uri);
    }
  }

  @Override
  public int update(Uri uri, ContentValues initialValues, String selection, String[] selectionArgs) {
    int uriType = uriMatcher.match(uri);
    if (uriType == C.MATCH_MAP_ID) {
      /* Ensure well-formedness of the URI while getting the id: */
      String mapId = Long.decode(uri.getLastPathSegment()).toString();

      SQLiteDatabase db = dbHelper.getWritableDatabase();

      ContentValues dbValues = new ContentValues();
      dbValues.put(TileMap.Columns.KEY_NAME, initialValues.getAsString(TileMap.Columns.KEY_NAME));
      dbValues.put(TileMap.Columns.KEY_JSON_DATA, initialValues.getAsString(TileMap.Columns.KEY_JSON_DATA));
      dbValues.put(TileMap.Columns.KEY_LAST_UPDATE, System.currentTimeMillis());

      selection = TileMap.Columns.KEY_ROWID + "=?";
      selectionArgs = new String[] {
        mapId
      };

      int updated = db.update(C.DATABASE_TABLE, dbValues, selection, selectionArgs);

      /* Create the thumbnail on the filesystem */
      try {
        File thumbFile = new File(Util.getExternalThumbnailsDirectory(), "tn_" + mapId + ".png");
        FileOutputStream fos = new FileOutputStream(thumbFile);
        fos.write(initialValues.getAsByteArray(TileMap.Columns.KEY_THUMB));
        fos.close();
      } catch (Exception ex) {
        ex.printStackTrace();
      }
      /* Notify observers */
      getContext().getContentResolver().notifyChange(uri, null);
      // getContext().getContentResolver().notifyChange(C.CONTENT_URI, null);
      return updated;
    } else if (uriType == C.MATCH_MAPS) {
      Log.d(TAG, "requested update of all maps? uri: " + uri);
      return 0;
    } else {
      throw new IllegalArgumentException("Unknown URI: " + uri);
    }
  }

  @Override
  public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
    switch (uriMatcher.match(uri)) {
      case C.MATCH_MAPS:
      case C.MATCH_MAP_ID:
        break;

      default:
        throw new IllegalArgumentException("Unknown URI: " + uri);
    }

    SQLiteDatabase db = dbHelper.getWritableDatabase();// dbHelper.getReadableDatabase();
    Cursor c = db.query(C.DATABASE_TABLE, projection, selection, selectionArgs, null, null, sortOrder);

    c.setNotificationUri(getContext().getContentResolver(), uri);
    // Don't close the DB or the cursor will be closed as well.
    return c;
  }

  /*
   * Helper class handling database creation and upgrade.
   */
  private static class DatabaseHelper extends SQLiteOpenHelper {
    Context context;

    DatabaseHelper(Context context) {
      super(context, C.DATABASE_NAME, null, C.DATABASE_VERSION);
      this.context = context;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
      db.execSQL(context.getString(R.string.sql_ddl_create));
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
      // Nothing to do.
    }
  }

}

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