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[FLINK-15670][core] Provide a utility function to flatten a recursive…
… Properties to a first level property HashTable In some cases, KafkaProducer#propsToMap for example, Properties is used purely as a HashTable without considering its default properties.
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flink-core/src/test/java/org/apache/flink/util/PropertiesUtilTest.java
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/* | ||
* 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 | ||
* | ||
* https://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. | ||
*/ | ||
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package org.apache.flink.util; | ||
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import org.junit.Assert; | ||
import org.junit.Test; | ||
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import java.util.Properties; | ||
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import static org.apache.flink.util.PropertiesUtil.flatten; | ||
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/** | ||
* Tests for the {@link PropertiesUtil}. | ||
*/ | ||
public class PropertiesUtilTest { | ||
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@Test | ||
public void testFlatten() { | ||
// default Properties is null | ||
Properties prop1 = new Properties(); | ||
prop1.put("key1", "value1"); | ||
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// default Properties is prop1 | ||
Properties prop2 = new Properties(prop1); | ||
prop2.put("key2", "value2"); | ||
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// default Properties is prop2 | ||
Properties prop3 = new Properties(prop2); | ||
prop3.put("key3", "value3"); | ||
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Properties flattened = flatten(prop3); | ||
Assert.assertEquals(flattened.get("key1"), "value1"); | ||
Assert.assertEquals(flattened.get("key2"), "value2"); | ||
Assert.assertEquals(flattened.get("key3"), "value3"); | ||
} | ||
} |