kafka HelpCommandHandler 源码
kafka HelpCommandHandler 代码
文件路径：/shell/src/main/java/org/apache/kafka/shell/HelpCommandHandler.java
/*
* 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.kafka.shell;
import net.sourceforge.argparse4j.inf.ArgumentParser;
import net.sourceforge.argparse4j.inf.Namespace;
import org.jline.reader.Candidate;
import java.io.PrintWriter;
import java.util.List;
import java.util.Optional;
/**
* Implements the help command.
*/
public final class HelpCommandHandler implements Commands.Handler {
public final static Commands.Type TYPE = new HelpCommandType();
public static class HelpCommandType implements Commands.Type {
private HelpCommandType() {
}
@Override
public String name() {
return "help";
}
@Override
public String description() {
return "Display this help message.";
}
@Override
public boolean shellOnly() {
return true;
}
@Override
public void addArguments(ArgumentParser parser) {
// nothing to do
}
@Override
public Commands.Handler createHandler(Namespace namespace) {
return new HelpCommandHandler();
}
@Override
public void completeNext(MetadataNodeManager nodeManager, List<String> nextWords,
List<Candidate> candidates) throws Exception {
// nothing to do
}
}
@Override
public void run(Optional<InteractiveShell> shell,
PrintWriter writer,
MetadataNodeManager manager) {
writer.printf("Welcome to the Apache Kafka metadata shell.%n%n");
new Commands(true).parser().printHelp(writer);
}
@Override
public int hashCode() {
return 0;
}
@Override
public boolean equals(Object other) {
if (!(other instanceof HelpCommandHandler)) return false;
return true;
}
}
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