dimas-b commented on code in PR #1555: URL: https://github.com/apache/polaris/pull/1555#discussion_r2107516552
########## polaris-core/src/main/java/org/apache/polaris/core/persistence/pagination/EntityIdPageToken.java: ########## @@ -0,0 +1,120 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 org.apache.polaris.core.persistence.pagination; + +import java.util.List; +import java.util.Optional; +import org.apache.polaris.core.entity.EntityNameLookupRecord; +import org.apache.polaris.core.entity.PolarisBaseEntity; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class EntityIdPageToken extends PageToken implements HasPageSize { + private static final Logger LOGGER = LoggerFactory.getLogger(EntityIdPageToken.class); + + public static final String PREFIX = "entity-id"; + + /** The minimum ID that could be attached to an entity */ + private static final long MINIMUM_ID = 0; + + /** The entity ID to use to start with. */ + public static final long BASE_ID = MINIMUM_ID - 1; + + private final long entityId; + private final int pageSize; + + public EntityIdPageToken(int pageSize) { + this.entityId = BASE_ID; + this.pageSize = pageSize; + } + + public EntityIdPageToken(long entityId, int pageSize) { + this.entityId = entityId; + this.pageSize = pageSize; + } + + /** + * Build an {@link EntityIdPageToken} from a {@link PageRequest}, or else a {@link + * ReadEverythingPageToken} if the request doesn't require pagination. + */ + public static PageToken fromPageRequest(PageRequest pageRequest) { + if (pageRequest.getPageTokenString().isEmpty()) { + if (pageRequest.getPageSize().isEmpty()) { + return PageToken.readEverything(); Review Comment: I mean, the code that needs to extract a specific token from `PageRequest` already knows the exact token class. The "read everything" case is the only exception. I do not see a need for polymorphic tokens at this state of the code. Each Persistence uses only one token type. If we later have polymorphic token use cases, let's handle it then and keep the code simple for now. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@polaris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
