fsk119 commented on code in PR #21786: URL: https://github.com/apache/flink/pull/21786#discussion_r1092736383
########## flink-table/flink-sql-client/src/main/java/org/apache/flink/table/client/cli/Printer.java: ########## @@ -0,0 +1,252 @@ +/* + * 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.flink.table.client.cli; + +import org.apache.flink.api.common.JobID; +import org.apache.flink.configuration.ReadableConfig; +import org.apache.flink.table.api.ResultKind; +import org.apache.flink.table.client.gateway.ClientResult; +import org.apache.flink.table.client.gateway.ResultDescriptor; +import org.apache.flink.table.utils.print.PrintStyle; + +import org.jline.terminal.Terminal; +import org.jline.utils.InfoCmp; + +import java.io.Closeable; + +import static org.apache.flink.table.api.config.TableConfigOptions.TABLE_DML_SYNC; +import static org.apache.flink.table.client.cli.CliStrings.MESSAGE_EXECUTE_STATEMENT; +import static org.apache.flink.table.client.cli.CliStrings.MESSAGE_FINISH_STATEMENT; +import static org.apache.flink.table.client.cli.CliStrings.MESSAGE_STATEMENT_SUBMITTED; +import static org.apache.flink.table.client.cli.CliStrings.MESSAGE_SUBMITTING_STATEMENT; + +/** Printer to print the results to the terminal. */ +public interface Printer extends Closeable { + + /** Flag to determine whether to stop the execution. */ + boolean isQuitCommand(); + + /** Print the results to the terminal. */ + void print(Terminal terminal); + + /** Close the resource of the {@link Printer}. */ + void close(); + + // -------------------------------------------------------------------------------------------- + + static ClearCommandPrinter createClearCommandPrinter() { + return ClearCommandPrinter.INSTANCE; + } + + static QuitCommandPrinter createQuitCommandPrinter() { + return QuitCommandPrinter.INSTANCE; + } + + static HelpCommandPrinter createHelpCommandPrinter() { + return HelpCommandPrinter.INSTANCE; + } + + static ClientResultPrinter createClientResultPrinter( + ClientResult result, ReadableConfig sessionConfig) { + return new ClientResultPrinter(result, sessionConfig); + } + + static InitializationResultPrinter createInitializationResultPrinter() { + return InitializationResultPrinter.INSTANCE; + } + + // -------------------------------------------------------------------------------------------- + // Printers + // -------------------------------------------------------------------------------------------- + + /** Printer to print the HELP results. */ + class HelpCommandPrinter implements Printer { + + private static final HelpCommandPrinter INSTANCE = new HelpCommandPrinter(); + + @Override + public boolean isQuitCommand() { + return false; + } + + @Override + public void print(Terminal terminal) { + terminal.writer().println(CliStrings.MESSAGE_HELP); + terminal.flush(); + } + + @Override + public void close() {} + } + + /** Printer to print the QUIT messages. */ + class QuitCommandPrinter implements Printer { + + private static final QuitCommandPrinter INSTANCE = new QuitCommandPrinter(); + + @Override + public boolean isQuitCommand() { + return true; + } + + @Override + public void print(Terminal terminal) { + printInfo(terminal, CliStrings.MESSAGE_QUIT); + } + + @Override + public void close() {} + } + + /** Printer to clear the terminal. */ + class ClearCommandPrinter implements Printer { + + private static final ClearCommandPrinter INSTANCE = new ClearCommandPrinter(); + + @Override + public boolean isQuitCommand() { + return false; + } + + @Override + public void print(Terminal terminal) { + if (TerminalUtils.isPlainTerminal(terminal)) { + for (int i = 0; i < 200; i++) { // large number of empty lines + terminal.writer().println(); + } + } else { + terminal.puts(InfoCmp.Capability.clear_screen); + } + } + + @Override + public void close() {} + } + + /** Printer prints the initialization results. */ + class InitializationResultPrinter implements Printer { + + static final InitializationResultPrinter INSTANCE = new InitializationResultPrinter(); + + private InitializationResultPrinter() {} + + @Override + public boolean isQuitCommand() { + return false; + } + + @Override + public void print(Terminal terminal) { + printInfo(terminal, MESSAGE_EXECUTE_STATEMENT); + } + + @Override + public void close() {} + } + + /** Printer prints the statement results. */ + class ClientResultPrinter implements Printer { Review Comment: I rename to `StatementCommandPrinter` -- This is an automated message from the Apache Git Service. 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