spark MapConfigProvider 源码
spark MapConfigProvider 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/util/MapConfigProvider.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.spark.network.util;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
/** ConfigProvider based on a Map (copied in the constructor). */
public class MapConfigProvider extends ConfigProvider {
public static final MapConfigProvider EMPTY = new MapConfigProvider(Collections.emptyMap());
private final Map<String, String> config;
public MapConfigProvider(Map<String, String> config) {
this.config = new HashMap<>(config);
}
@Override
public String get(String name) {
String value = config.get(name);
if (value == null) {
throw new NoSuchElementException(name);
}
return value;
}
@Override
public String get(String name, String defaultValue) {
String value = config.get(name);
return value == null ? defaultValue : value;
}
@Override
public Iterable<Map.Entry<String, String>> getAll() {
return config.entrySet();
}
}
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