hadoop ConfigurationBasicValidator 源码
haddop ConfigurationBasicValidator 代码
文件路径：/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/diagnostics/ConfigurationBasicValidator.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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.hadoop.fs.azurebfs.diagnostics;
import org.apache.hadoop.fs.azurebfs.contracts.diagnostics.ConfigurationValidator;
import org.apache.hadoop.fs.azurebfs.contracts.exceptions.InvalidConfigurationValueException;
/**
* ConfigurationBasicValidator covers the base case of missing user defined configuration value
* @param <T> the type of the validated value
*/
abstract class ConfigurationBasicValidator<T> implements ConfigurationValidator {
private final T defaultVal;
private final String configKey;
private final boolean throwIfInvalid;
ConfigurationBasicValidator(final String configKey, final T defaultVal, final boolean throwIfInvalid) {
this.configKey = configKey;
this.defaultVal = defaultVal;
this.throwIfInvalid = throwIfInvalid;
}
/**
* This method handles the base case where the configValue is null, based on the throwIfInvalid it either throws or returns the defaultVal,
* otherwise it returns null indicating that the configValue needs to be validated further.
* @param configValue the configuration value set by the user
* @return the defaultVal in case the configValue is null and not required to be set, null in case the configValue not null
* @throws InvalidConfigurationValueException in case the configValue is null and required to be set
*/
public T validate(final String configValue) throws InvalidConfigurationValueException {
if (configValue == null) {
if (this.throwIfInvalid) {
throw new InvalidConfigurationValueException(this.configKey);
}
return this.defaultVal;
}
return null;
}
public T getDefaultVal() {
return this.defaultVal;
}
public String getConfigKey() {
return this.configKey;
}
public boolean getThrowIfInvalid() {
return this.throwIfInvalid;
}
}
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