| /* |
| * Copyright 2017 HugeGraph Authors |
| * |
| * 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 com.baidu.hugegraph.config; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.function.Function; |
| |
| import com.baidu.hugegraph.util.E; |
| import com.google.common.base.Predicate; |
| |
| public class ConfigListOption<T> extends ConfigOption<List<T>> { |
| |
| private final Class<T> elemClass; |
| |
| @SuppressWarnings("unchecked") |
| public ConfigListOption(String name, String desc, |
| Predicate<List<T>> pred, T... values) { |
| this(name, false, desc, pred, null, Arrays.asList(values)); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public ConfigListOption(String name, boolean required, String desc, |
| Predicate<List<T>> pred, Class<T> clazz, |
| List<T> values) { |
| super(name, required, desc, pred, |
| (Class<List<T>>) values.getClass(), values); |
| if (clazz == null && values.size() > 0) { |
| clazz = (Class<T>) values.get(0).getClass(); |
| } |
| E.checkArgumentNotNull(clazz, "Element class can't be null"); |
| this.elemClass = clazz; |
| } |
| |
| @Override |
| protected boolean forList() { |
| return true; |
| } |
| |
| @Override |
| protected List<T> parse(String value) { |
| return convert(value, part -> this.parse(part, this.elemClass)); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static <T> List<T> convert(Object value, Function<String, ?> conv) { |
| if (value instanceof List) { |
| return (List<T>) value; |
| } |
| // If target data type is List, parse it as a list |
| String str = (String) value; |
| if (str.startsWith("[") && str.endsWith("]")) { |
| str = str.substring(1, str.length() - 1); |
| } else { |
| throw new ConfigException( |
| "The list type config option expected " + |
| "to be wrapped in [], actual '%s'", str); |
| } |
| |
| String[] parts = str.split(","); |
| List<T> results = new ArrayList<>(parts.length); |
| for (String part : parts) { |
| results.add((T) conv.apply(part.trim())); |
| } |
| return results; |
| } |
| } |