src/android/src/com/google/android/inputmethod/japanese/userdictionary/UserDictionaryExportProvider.java

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package org.mozc.android.inputmethod.japanese.userdictionary;

import org.mozc.android.inputmethod.japanese.MozcLog;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.ParcelFileDescriptor;

import java.io.File;
import java.io.FileNotFoundException;

import javax.annotation.Nullable;

/**
 * Content provider class to export a user dictionary.
 */
public class UserDictionaryExportProvider extends ContentProvider {

  @Override
  public boolean onCreate() {
    return true;
  }

  @Override
  public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
    File inputFile = new File(uri.getPath());
    if (!inputFile.canRead()) {
      MozcLog.e(inputFile.getAbsolutePath() + "doesn't exist.");
      // Failed to export the user dictionary. This exception doesn't cause a crash.
      throw new FileNotFoundException();
    }
    return ParcelFileDescriptor.open(inputFile, ParcelFileDescriptor.MODE_READ_ONLY);
  }

  @Override
  public String getType(Uri uri) {
    return "application/zip";
  }

  @Override
  @Nullable
  public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
                      String sortOrder) {
    return null;
  }

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

  @Override
  @Nullable
  public Uri insert(Uri uri, ContentValues values) {
    return null;
  }

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