DataProviderUsbInfo.java

/*******************************************************************************
 * Copyright 2011 Alexandros Schillings
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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 aws.apps.usbDeviceEnumerator.data;

import android.content.Context;
import android.database.Cursor;
import android.util.Log;

import java.io.File;

import aws.apps.usbDeviceEnumerator.BuildConfig;

public class DataProviderUsbInfo implements DataProvider {

    public static final String UNKNOWN_RESULT = "not found";
    private final String TAG = this.getClass().getName();
    private Context context;

    private String fileFullPath = "";

    public DataProviderUsbInfo(Context context) {
        this.context = context.getApplicationContext();
        doPathStuff();
    }

    private static String tryNull(final String suspect,
                                  final String defaultString) {
        if (suspect == null) {
            return defaultString;
        }
        return suspect;
    }

    @Override
    public boolean isDataAvailable() {
        final boolean okToAccessData;

        if (!new File(getDataFilePath()).exists()) {
            Log.e(TAG, "^ Cannot access: " + fileFullPath);
            okToAccessData = false;
        } else {
            okToAccessData = true;
        }

        return okToAccessData;
    }

    private void doPathStuff() {
        final File baseDir = StorageUtils.getExternalStorageLocation(context);

        if (baseDir == null) {
            fileFullPath = "";
        } else {
            fileFullPath = new File(baseDir, BuildConfig.USB_DB_FILE_NAME).getAbsolutePath();
        }
    }

    @Override
    public String getDataFilePath() {
        return fileFullPath;
    }

    @Override
    public String getUrl() {
        return BuildConfig.USB_DB_URL;
    }

    public String getProductName(String vid, String pid) {
        final Cursor cur = StorageUtils.executeQuery(
                context,
                getDataFilePath(),
                "usb",
                new String[]{"vid", "vendor_name", "did", "device_name", "ifid", "interface_name"},
                "did=? AND vid=?",
                new String[]{vid, pid},
                "vid, did, ifid ASC");

        final String result = StorageUtils.getStringAndClose(cur, "device_name");

        return tryNull(result, UNKNOWN_RESULT);
    }

    public String getVendorName(String vid) {
        final Cursor cur = StorageUtils.executeQuery(
                context,
                getDataFilePath(),
                "usb",
                new String[]{"vid", "vendor_name", "did", "device_name", "ifid", "interface_name"},
                "vid=? AND did=''",
                new String[]{vid},
                "vid, did, ifid ASC");

        final String result = StorageUtils.getStringAndClose(cur, "vendor_name");

        return tryNull(result, UNKNOWN_RESULT);
    }
}