| /* |
| * 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.giraph.conf; |
| |
| import org.apache.hadoop.conf.Configuration; |
| |
| import com.google.common.base.Objects; |
| |
| /** |
| * Enum Configuration option |
| * |
| * @param <T> Enum class |
| */ |
| public class EnumConfOption<T extends Enum<T>> extends AbstractConfOption { |
| /** Enum class */ |
| private final Class<T> klass; |
| /** Default value */ |
| private final T defaultValue; |
| |
| /** |
| * Constructor |
| * |
| * @param key Configuration key |
| * @param klass Enum class |
| * @param defaultValue default value |
| * @param description description of the option |
| */ |
| public EnumConfOption(String key, Class<T> klass, T defaultValue, |
| String description) { |
| super(key, description); |
| this.klass = klass; |
| this.defaultValue = defaultValue; |
| } |
| |
| /** |
| * Create new EnumConfOption |
| * |
| * @param key String configuration key |
| * @param klass enum class |
| * @param defaultValue default enum value |
| * @param description description of the option |
| * @param <X> enum type |
| * @return EnumConfOption |
| */ |
| public static <X extends Enum<X>> EnumConfOption<X> |
| create(String key, Class<X> klass, X defaultValue, String description) { |
| return new EnumConfOption<X>(key, klass, defaultValue, description); |
| } |
| |
| @Override public boolean isDefaultValue(Configuration conf) { |
| return Objects.equal(get(conf), defaultValue); |
| } |
| |
| @Override public String getDefaultValueStr() { |
| return defaultValue.name(); |
| } |
| |
| @Override public ConfOptionType getType() { |
| return ConfOptionType.ENUM; |
| } |
| |
| /** |
| * Lookup value |
| * |
| * @param conf Configuration |
| * @return enum value |
| */ |
| public T get(Configuration conf) { |
| String valueStr = conf.get(getKey(), getDefaultValueStr()); |
| return T.valueOf(klass, valueStr); |
| } |
| |
| /** |
| * Set value |
| * |
| * @param conf Configuration |
| * @param value to set |
| */ |
| public void set(Configuration conf, Enum<T> value) { |
| conf.set(getKey(), value.name()); |
| } |
| |
| /** |
| * Set value if it's not already present |
| * |
| * @param conf Configuration |
| * @param value to set |
| */ |
| public void setIfUnset(Configuration conf, Enum<T> value) { |
| if (!contains(conf)) { |
| set(conf, value); |
| } |
| } |
| } |