dcapwell commented on a change in pull request #1335: URL: https://github.com/apache/cassandra/pull/1335#discussion_r802071304
########## File path: src/java/org/apache/cassandra/config/Properties.java ########## @@ -0,0 +1,215 @@ +/* + * 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.cassandra.config; + +import java.lang.annotation.Annotation; +import java.util.ArrayDeque; +import java.util.Collection; +import java.util.Collections; +import java.util.List; +import java.util.Map; +import java.util.Queue; +import java.util.SortedMap; +import java.util.TreeMap; + +import com.google.common.collect.Maps; + +import org.yaml.snakeyaml.introspector.Property; + +public final class Properties +{ + public static final String DELIMITER = "."; + + private Properties() + { + } + + public static Property andThen(Property root, Property leaf, String delimiter) + { + return new AndThen(root, leaf, delimiter); + } + + public static Property andThen(Property root, Property leaf) + { + return andThen(root, leaf, DELIMITER); + } + + public static Map<String, Property> flatten(Loader loader, Map<String, Property> input) + { + return flatten(loader, input, DELIMITER); + } + + public static Map<String, Property> flatten(Loader loader, Map<String, Property> input, String delimiter) + { + Queue<Property> queue = new ArrayDeque<>(); + queue.addAll(input.values()); + + Map<String, Property> output = Maps.newHashMapWithExpectedSize(input.size()); + while (!queue.isEmpty()) + { + Property prop = queue.poll(); + if (isPrimitive(prop) || isCollection(prop)) + { + output.put(prop.getName(), prop); + continue; + } + Map<String, Property> children = loader.getProperties(prop.getType()); + if (children.isEmpty()) + { + // not a primitive, but has no properties... assume can handle + output.put(prop.getName(), prop); + } + else + { + children.values().stream().map(p -> andThen(prop, p, delimiter)).forEach(queue::add); + } + } + return output; + } + + public static boolean isCollection(Property prop) + { + return Collection.class.isAssignableFrom(prop.getType()) || Map.class.isAssignableFrom(prop.getType()); + } + + public static boolean isPrimitive(Property prop) + { + Class<?> type = prop.getType(); + return type.isPrimitive() || type.isEnum() || type.equals(String.class) || Number.class.isAssignableFrom(type) || Boolean.class.equals(type); + } + + public static Loader defaultLoader() + { + return new DefaultLoader(); + } + + public static CharSequence toStringTree(Class<?> klass) + { + Loader loader = defaultLoader(); + SortedMap<String, Property> properties = new TreeMap<>(loader.getProperties(klass)); + StringBuilder sb = new StringBuilder(); + addConfigs(loader, properties, sb, 0); + return sb; + } + + public static CharSequence toStringTree(Map<String, Property> input) + { + SortedMap<String, Property> properties = new TreeMap<>(input); + StringBuilder sb = new StringBuilder(); + addConfigs(defaultLoader(), properties, sb, 0); + return sb; + } + + private static void addConfigs(Loader loader, SortedMap<String, Property> properties, StringBuilder sb, int layer) + { + for (Map.Entry<String, Property> e : properties.entrySet()) + { + for (int i = 0; i < layer; i++) + sb.append(" "); + sb.append(e.getKey()).append(":"); + Property property = e.getValue(); + Map<String, Property> subProperties = Properties.isPrimitive(property) || Properties.isCollection(property) ? Collections.emptyMap() : loader.getProperties(property.getType()); + if (subProperties.isEmpty()) + { + sb.append(" ").append(normalize(property.getType())); + sb.append("\n"); + } + else + { + sb.append(" # ").append(normalize(property.getType())).append("\n"); + addConfigs(loader, new TreeMap<>(subProperties), sb, layer + 1); + } + } + } + + private static String normalize(Class<?> type) + { + if (type.isEnum()) + return "Enum<" + type.getSimpleName() + ">"; + if (Number.class.isAssignableFrom(type)) + { + if (Integer.class.equals(type)) + return "int"; + if (Long.class.equals(type)) + return "long"; + if (Float.class.equals(type)) + return "float"; + if (Double.class.equals(type)) + return "double"; + } + return type.getSimpleName(); + } + + private static final class AndThen extends Property + { + private final Property root; + private final Property leaf; + + public AndThen(Property root, Property leaf, String delimiter) + { + super(root.getName() + delimiter + leaf.getName(), leaf.getType()); + this.root = root; + this.leaf = leaf; + } + + @Override + public Class<?>[] getActualTypeArguments() + { + return leaf.getActualTypeArguments(); + } + + @Override + public void set(Object o, Object o1) throws Exception + { + Object parent = root.get(o); + if (parent == null) + return; Review comment: should this be a NPE? -- This is an automated message from the Apache Git Service. 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