Java Cursor.toWebSafeString方法代码示例

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
@Override
public Result<Book> listBooks(String startCursorString) {
  FetchOptions fetchOptions = FetchOptions.Builder.withLimit(10); // Only show 10 at a time
  if (startCursorString != null && !startCursorString.equals("")) {
    fetchOptions.startCursor(Cursor.fromWebSafeString(startCursorString)); // Where we left off
  }
  Query query = new Query(BOOK_KIND) // We only care about Books
      .addSort(Book.TITLE, SortDirection.ASCENDING); // Use default Index "title"
  PreparedQuery preparedQuery = datastore.prepare(query);
  QueryResultIterator<Entity> results = preparedQuery.asQueryResultIterator(fetchOptions);

  List<Book> resultBooks = entitiesToBooks(results);     // Retrieve and convert Entities
  Cursor cursor = results.getCursor();              // Where to start next time
  if (cursor != null && resultBooks.size() == 10) {         // Are we paging? Save Cursor
    String cursorString = cursor.toWebSafeString();               // Cursors are WebSafe
    return new Result<>(resultBooks, cursorString);
  } else {
    return new Result<>(resultBooks);
  }
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
@Override
public Result<Book> listBooksByUser(String userId, String startCursorString) {
  FetchOptions fetchOptions = FetchOptions.Builder.withLimit(10); // Only show 10 at a time
  if (startCursorString != null && !startCursorString.equals("")) {
    fetchOptions.startCursor(Cursor.fromWebSafeString(startCursorString)); // Where we left off
  }
  Query query = new Query(BOOK_KIND) // We only care about Books
      // Only for this user
      .setFilter(new Query.FilterPredicate(
          Book.CREATED_BY_ID, Query.FilterOperator.EQUAL, userId))
      // a custom datastore index is required since you are filtering by one property
      // but ordering by another
      .addSort(Book.TITLE, SortDirection.ASCENDING);
  PreparedQuery preparedQuery = datastore.prepare(query);
  QueryResultIterator<Entity> results = preparedQuery.asQueryResultIterator(fetchOptions);

  List<Book> resultBooks = entitiesToBooks(results);     // Retrieve and convert Entities
  Cursor cursor = results.getCursor();              // Where to start next time
  if (cursor != null && resultBooks.size() == 10) {         // Are we paging? Save Cursor
    String cursorString = cursor.toWebSafeString();               // Cursors are WebSafe
    return new Result<>(resultBooks, cursorString);
  } else {
    return new Result<>(resultBooks);
  }
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
@Nullable
public static PagingInfo create(@Nullable Cursor afterCursor, int limit, boolean moreResults,
    UriInfo uriInfo) {
  String afterCursorStr = (afterCursor == null) ? "" : afterCursor.toWebSafeString();
  if (afterCursorStr.isEmpty()) {
    return null;
  } else {
    String nextUrl;
    if (moreResults) {
      Multimap<String, String> queryParams = toMultimap(uriInfo.getQueryParameters());
      queryParams.replaceValues(AFTER_CURSOR_PARAM, asList(afterCursorStr));
      queryParams.replaceValues(LIMIT_PARAM, asList(String.valueOf(limit)));
      nextUrl = URLUtil.buildURL(uriInfo.getAbsolutePath(), queryParams);
    } else {
      nextUrl = null;
    }
    return new PagingInfo(nextUrl, afterCursorStr);
  }
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
@ApiMethod(name = "listUsers")
public CollectionResponse<Users> listQuote(@Nullable @com.google.api.server.spi.config.Named("cursor") String cursorString,
                                           @Nullable @com.google.api.server.spi.config.Named("count") Integer count) {

    Query<Users> query = ofy().load().type(Users.class);
    if (count != null) query.limit(count);
    if (cursorString != null && cursorString != "") {
        query = query.startAt(Cursor.fromWebSafeString(cursorString));
    }
    List<Users> records = new ArrayList<Users>();
    QueryResultIterator<Users> iterator = query.iterator();
    int num = 0;
    while (iterator.hasNext()) {
        records.add(iterator.next());
        if (count != null) {
            num++;
            if (num == count) break;
        }
    }
    //Find the next cursor
    if (cursorString != null && cursorString != "") {
        Cursor cursor = iterator.getCursor();
        if (cursor != null) {
            cursorString = cursor.toWebSafeString();
        }
    }
    return CollectionResponse.<Users>builder().setItems(records).setNextPageToken(cursorString).build();
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
public void setResult(final QueryResultList<Entity> result, final Cursor cursor, final boolean noMore) {
    final ArrayList<Entity> list = new ArrayList<>(result);

    if (bshFilter != null) {
        filterList(list);
    }

    resultBytes = SerializationHelper.getBytes(list);
    hasMore = !noMore;
    webCursor = cursor.toWebSafeString();
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
private String merge(String cursorString) {
    Query<UserAnswer> query = ofy().load().type(UserAnswer.class).limit(1000);
    List<UserAnswer> toSaveList = new ArrayList<UserAnswer>(); 

    if (cursorString != null) {
        query = query.startAt(Cursor.fromWebSafeString(cursorString));
    }

    boolean cont = false;
    QueryResultIterator<UserAnswer> iterator = query.iterator();

    while (iterator.hasNext()) {
        UserAnswer userAnswer = iterator.next();
        Map<String, String> answers = userAnswer.getAnswers();
        if(answers != null) {
            String answer = answers.get("householdIncome");
            if("$100,000-$149,999".equals(answer) || "$150,000-$199,999".equals(answer) ||
                    "$200,000-$249,999".equals(answer) || "$300,000 or more".equals(answer)) {
                answers.put("householdIncome", "$100,000 or more");
                toSaveList.add(userAnswer);
            }
        }
        cont = true;
    }

    if(toSaveList.size() > 0) {
        ofy().save().entities(toSaveList).now();
        logger.info(String.format("Merged %d answers", toSaveList.size()));
    }
    
    if(cont) {
        Cursor cursor = iterator.getCursor();
        return cursor.toWebSafeString();
    } else {
        return null;
    }
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
private String approve(String cursorString) {
    Query<UserAnswer> query = ofy().load().type(UserAnswer.class).limit(30);

    if (cursorString != null) {
        query = query.startAt(Cursor.fromWebSafeString(cursorString));
    }

    boolean cont = false;
    QueryResultIterator<UserAnswer> iterator = query.iterator();

    while (iterator.hasNext()) {
        UserAnswer userAnswer = iterator.next();
        try {
            List<Assignment> assignments = getAssignmentsForHITService.getAssignments(true, userAnswer.getHitId());
            for(Assignment assignment: assignments) {
                approveAssignmentService.approveAssignment(true, assignment.getAssignmentId());
            }
        } catch (MturkException e) {
            logger.log(Level.WARNING, e.getMessage());
        }
        cont = true;
    }

    if(cont) {
        Cursor cursor = iterator.getCursor();
        return cursor.toWebSafeString();
    } else {
        return null;
    }
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
private String dispose(String cursorString) {
    Calendar endCal = Calendar.getInstance();
    endCal.setTime(new Date());
    endCal.set(Calendar.HOUR_OF_DAY, 0);
    endCal.set(Calendar.MINUTE, 0);
    endCal.set(Calendar.SECOND, 0);
    
    Calendar startCal = Calendar.getInstance();
    startCal.setTime(endCal.getTime());
    startCal.add(Calendar.DAY_OF_MONTH, -1);

    Query<UserAnswer> query = ofy().load().type(UserAnswer.class)
            .filter("date >=", startCal.getTime()).filter("date <", endCal.getTime()).limit(30);

    if (cursorString != null) {
        query = query.startAt(Cursor.fromWebSafeString(cursorString));
    }

    boolean cont = false;
    QueryResultIterator<UserAnswer> iterator = query.iterator();

    while (iterator.hasNext()) {
        UserAnswer userAnswer = iterator.next();
        try {
            disposeHITService.disposeHIT(true, userAnswer.getHitId());
            logger.log(Level.INFO, String.format("Disposed HIT %s", userAnswer.getHitId()));
        } catch (MturkException e) {
            logger.log(Level.WARNING, e.getMessage());
        }
        cont = true;
    }

    if(cont) {
        Cursor cursor = iterator.getCursor();
        return cursor.toWebSafeString();
    } else {
        return null;
    }
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
/**
 * This method lists all the entities inserted in datastore.
 * It uses HTTP GET method and paging support.
 *
 * @return A CollectionResponse class containing the list of all entities
 * persisted and a cursor to the next page.
 */
@SuppressWarnings({ "unchecked", "unused" })
@ApiMethod(name = "listCategory")
public CollectionResponse<Category> listCategory(
		@Nullable @Named("cursor") String cursorString,
		@Nullable @Named("limit") Integer limit) {

	EntityManager mgr = null;
	Cursor cursor = null;
	List<Category> execute = null;

	try {
		mgr = getEntityManager();
		Query query = mgr.createQuery("select from Category as Category");
		if (cursorString != null && cursorString != "") {
			cursor = Cursor.fromWebSafeString(cursorString);
			query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
		}

		if (limit != null) {
			query.setFirstResult(0);
			query.setMaxResults(limit);
		}

		execute = (List<Category>) query.getResultList();
		cursor = JPACursorHelper.getCursor(execute);
		if (cursor != null)
			cursorString = cursor.toWebSafeString();

		// Tight loop for fetching all entities from datastore and accomodate
		// for lazy fetch.
		for (Category obj : execute)
			;
	} finally {
		mgr.close();
	}

	return CollectionResponse.<Category> builder().setItems(execute)
			.setNextPageToken(cursorString).build();
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
/**
 * This method lists all the entities inserted in datastore.
 * It uses HTTP GET method and paging support.
 *
 * @return A CollectionResponse class containing the list of all entities
 * persisted and a cursor to the next page.
 */
@SuppressWarnings({ "unchecked", "unused" })
@ApiMethod(name = "listExpense")
public CollectionResponse<Expense> listExpense(
		@Nullable @Named("cursor") String cursorString,
		@Nullable @Named("limit") Integer limit) {

	EntityManager mgr = null;
	Cursor cursor = null;
	List<Expense> execute = null;

	try {
		mgr = getEntityManager();
		Query query = mgr.createQuery("select from Expense as Expense");
		if (cursorString != null && cursorString != "") {
			cursor = Cursor.fromWebSafeString(cursorString);
			query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
		}

		if (limit != null) {
			query.setFirstResult(0);
			query.setMaxResults(limit);
		}

		execute = (List<Expense>) query.getResultList();
		cursor = JPACursorHelper.getCursor(execute);
		if (cursor != null)
			cursorString = cursor.toWebSafeString();

		// Tight loop for fetching all entities from datastore and accomodate
		// for lazy fetch.
		for (Expense obj : execute)
			;
	} finally {
		mgr.close();
	}

	return CollectionResponse.<Expense> builder().setItems(execute)
			.setNextPageToken(cursorString).build();
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
/**
 * This method lists all the entities inserted in datastore.
 * It uses HTTP GET method and paging support.
 *
 * @return A CollectionResponse class containing the list of all entities
 * persisted and a cursor to the next page.
 */
@SuppressWarnings({ "unchecked", "unused" })
@ApiMethod(name = "listIncome")
public CollectionResponse<Income> listIncome(
		@Nullable @Named("cursor") String cursorString,
		@Nullable @Named("limit") Integer limit) {

	EntityManager mgr = null;
	Cursor cursor = null;
	List<Income> execute = null;

	try {
		mgr = getEntityManager();
		Query query = mgr.createQuery("select from Income as Income");
		if (cursorString != null && cursorString != "") {
			cursor = Cursor.fromWebSafeString(cursorString);
			query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
		}

		if (limit != null) {
			query.setFirstResult(0);
			query.setMaxResults(limit);
		}

		execute = (List<Income>) query.getResultList();
		cursor = JPACursorHelper.getCursor(execute);
		if (cursor != null)
			cursorString = cursor.toWebSafeString();

		// Tight loop for fetching all entities from datastore and accomodate
		// for lazy fetch.
		for (Income obj : execute)
			;
	} finally {
		mgr.close();
	}

	return CollectionResponse.<Income> builder().setItems(execute)
			.setNextPageToken(cursorString).build();
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
/**
 * This method lists all the entities inserted in datastore. It uses HTTP GET method and paging
 * support.
 * 
 * @return A CollectionResponse class containing the list of all entities persisted and a cursor
 *         to the next page.
 */
@SuppressWarnings({"unchecked", "unused"})
@ApiMethod(name = "listDeviceInfo")
public CollectionResponse<DeviceInfo> listDeviceInfo(
    @Nullable @Named("cursor") String cursorString, @Nullable @Named("limit") Integer limit) {

  Cursor cursor = null;
  List<DeviceInfo> execute = null;

  StringBuilder q = new StringBuilder("select from DeviceInfo as d order by timestamp DESC ");
  Query query = em.get().createQuery(q.toString());
  if (cursorString != null && cursorString != "") {
    cursor = Cursor.fromWebSafeString(cursorString);
    query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
  }

  if (limit != null) {
    query.setFirstResult(0);
    query.setMaxResults(limit);
  }

  execute = query.getResultList();
  cursor = JPACursorHelper.getCursor(execute);
  if (cursor != null) {
    cursorString = cursor.toWebSafeString();
  }

  // Tight loop for fetching all entities from datastore and accomodate
  // for lazy fetch.
  for (DeviceInfo obj : execute) {
    ;
  }

  return CollectionResponse.<DeviceInfo> builder().setItems(execute).setNextPageToken(
      cursorString).build();
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
@ApiMethod(name = "listAccountInfo")
public CollectionResponse<AccountInfo> listAccountInfo(
    @Nullable @Named("cursor") String cursorString, @Nullable @Named("limit") Integer limit) {

  Cursor cursor = null;

  StringBuilder q = new StringBuilder("select from AccountInfo as a");
  Query query = em.get().createQuery(q.toString());
  if (cursorString != null && cursorString != "") {
    cursor = Cursor.fromWebSafeString(cursorString);
    query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
  }

  if (limit != null) {
    query.setFirstResult(0);
    query.setMaxResults(limit);
  }

  @SuppressWarnings("unchecked")
  List<AccountInfo> execute = query.getResultList();
  cursor = JPACursorHelper.getCursor(execute);
  if (cursor != null) {
    cursorString = cursor.toWebSafeString();
  }

  // Tight loop for fetching all entities from datastore and accomodate
  // for lazy fetch.
  for (AccountInfo obj : execute) {
    ;
  }

  return CollectionResponse.<AccountInfo> builder().setItems(execute).setNextPageToken(
      cursorString).build();
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
/**
 * This method lists all the entities inserted in datastore.
 * It uses HTTP GET method and paging support.
 *
 * @return A CollectionResponse class containing the list of all entities
 * persisted and a cursor to the next page.
 */
@SuppressWarnings({"unchecked", "unused"})
@ApiMethod(name = "listOffer")
public CollectionResponse<Offer> listOffer(
    @Nullable @Named("cursor") String cursorString, @Nullable @Named("limit") Integer limit) {

  EntityManager mgr = null;
  Cursor cursor = null;
  List<Offer> execute = null;

  try {
    mgr = getEntityManager();
    Query query = mgr.createQuery("select from Offer as Offer");
    if (cursorString != null && cursorString != "") {
      cursor = Cursor.fromWebSafeString(cursorString);
      query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
    }

    if (limit != null) {
      query.setFirstResult(0);
      query.setMaxResults(limit);
    }

    execute = (List<Offer>) query.getResultList();
    cursor = JPACursorHelper.getCursor(execute);
    if (cursor != null) cursorString = cursor.toWebSafeString();

    // Tight loop for fetching all entities from datastore and accomodate
    // for lazy fetch.
    for (Offer obj : execute);
  } finally {
    mgr.close();
  }

  return CollectionResponse.<Offer>builder()
      .setItems(execute).setNextPageToken(cursorString).build();
}
 

import com.google.appengine.api.datastore.Cursor; //导入方法依赖的package包/类
/**
 * This method lists all the entities inserted in datastore.
 * It uses HTTP GET method and paging support.
 *
 * @return A CollectionResponse class containing the list of all entities
 * persisted and a cursor to the next page.
 */
@SuppressWarnings({"unchecked", "unused"})
@ApiMethod(name = "listRecommendation")
public CollectionResponse<Recommendation> listRecommendation(
    @Nullable @Named("cursor") String cursorString, @Nullable @Named("limit") Integer limit) {

  EntityManager mgr = null;
  Cursor cursor = null;
  List<Recommendation> execute = null;

  try {
    mgr = getEntityManager();
    Query query = mgr.createQuery("select from Recommendation as Recommendation");
    if (cursorString != null && cursorString != "") {
      cursor = Cursor.fromWebSafeString(cursorString);
      query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
    }

    if (limit != null) {
      query.setFirstResult(0);
      query.setMaxResults(limit);
    }

    execute = (List<Recommendation>) query.getResultList();
    cursor = JPACursorHelper.getCursor(execute);
    if (cursor != null) cursorString = cursor.toWebSafeString();

    // Tight loop for fetching all entities from datastore and accomodate
    // for lazy fetch.
    for (Recommendation obj : execute);
  } finally {
    mgr.close();
  }

  return CollectionResponse.<Recommendation>builder()
      .setItems(execute).setNextPageToken(cursorString).build();
}