kafka FindCommandHandler 源码
kafka FindCommandHandler 代码
文件路径:/shell/src/main/java/org/apache/kafka/shell/FindCommandHandler.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.apache.kafka.shell.MetadataNode.DirectoryNode;
import org.jline.reader.Candidate;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Optional;
/**
* Implements the find command.
*/
public final class FindCommandHandler implements Commands.Handler {
public final static Commands.Type TYPE = new FindCommandType();
public static class FindCommandType implements Commands.Type {
private FindCommandType() {
}
@Override
public String name() {
return "find";
}
@Override
public String description() {
return "Search for nodes in the directory hierarchy.";
}
@Override
public boolean shellOnly() {
return false;
}
@Override
public void addArguments(ArgumentParser parser) {
parser.addArgument("paths").
nargs("*").
help("The paths to start at.");
}
@Override
public Commands.Handler createHandler(Namespace namespace) {
return new FindCommandHandler(namespace.getList("paths"));
}
@Override
public void completeNext(MetadataNodeManager nodeManager, List<String> nextWords,
List<Candidate> candidates) throws Exception {
CommandUtils.completePath(nodeManager, nextWords.get(nextWords.size() - 1),
candidates);
}
}
private final List<String> paths;
public FindCommandHandler(List<String> paths) {
this.paths = paths;
}
@Override
public void run(Optional<InteractiveShell> shell,
PrintWriter writer,
MetadataNodeManager manager) throws Exception {
for (String path : CommandUtils.getEffectivePaths(paths)) {
manager.visit(new GlobVisitor(path, entryOption -> {
if (entryOption.isPresent()) {
find(writer, path, entryOption.get().node());
} else {
writer.println("find: " + path + ": no such file or directory.");
}
}));
}
}
private void find(PrintWriter writer, String path, MetadataNode node) {
writer.println(path);
if (node instanceof DirectoryNode) {
DirectoryNode directory = (DirectoryNode) node;
for (Entry<String, MetadataNode> entry : directory.children().entrySet()) {
String nextPath = path.equals("/") ?
path + entry.getKey() : path + "/" + entry.getKey();
find(writer, nextPath, entry.getValue());
}
}
}
@Override
public int hashCode() {
return Objects.hashCode(paths);
}
@Override
public boolean equals(Object other) {
if (!(other instanceof FindCommandHandler)) return false;
FindCommandHandler o = (FindCommandHandler) other;
if (!Objects.equals(o.paths, paths)) return false;
return true;
}
}
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