org.apache.kafka.image.node.MetadataNode Maven / Gradle / Ivy
/*
* 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.image.node;
import org.apache.kafka.image.node.printer.MetadataNodePrinter;
import org.apache.kafka.image.node.printer.NodeStringifier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
public interface MetadataNode {
default boolean isDirectory() {
return true;
}
/**
* Get the names of the children of this node, if there are any.
*/
default Collection childNames() {
return Collections.emptyList();
}
/**
* Get the child associated with the given name, or null if there is none.
*/
default MetadataNode child(String name) {
return null;
}
/**
* Print this node.
*/
default void print(MetadataNodePrinter printer) {
ArrayList names = new ArrayList<>(childNames());
names.sort(String::compareTo);
for (String name : names) {
printer.enterNode(name);
MetadataNode child = child(name);
child.print(printer);
printer.leaveNode();
}
}
/**
* Convert this node to a string using the default stringifier.
*/
default String stringify() {
NodeStringifier stringifier = new NodeStringifier();
print(stringifier);
return stringifier.toString();
}
}