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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.config;
import java.util.Objects;
import org.yaml.snakeyaml.introspector.Property;
/**
* Holder for replacements to support backward compatibility between old and new names and types
* of configuration parameters (CASSANDRA-15234)
*/
public final class Replacement
{
/**
* Currently we use Config class
*/
public final Class parent;
/**
* Old name of the configuration parameter
*/
public final String oldName;
/**
* Old type of the configuration parameter
*/
public final Class oldType;
/**
* New name used for the configuration parameter
*/
public final String newName;
/**
* Converter to be used according to the old default unit which was provided as a suffix of the configuration
* parameter
*/
public final Converters converter;
public final boolean deprecated;
public Replacement(Class parent,
String oldName,
Class oldType,
String newName,
Converters converter,
boolean deprecated)
{
this.parent = Objects.requireNonNull(parent);
this.oldName = Objects.requireNonNull(oldName);
this.oldType = Objects.requireNonNull(oldType);
this.newName = Objects.requireNonNull(newName);
this.converter = Objects.requireNonNull(converter);
// by default deprecated is false
this.deprecated = deprecated;
}
public Property toProperty(Property newProperty)
{
return new ForwardingProperty(oldName, oldType, newProperty)
{
@Override
public void set(Object o, Object o1) throws Exception
{
newProperty.set(o, converter.convert(o1));
}
@Override
public Object get(Object o)
{
return converter.unconvert(newProperty.get(o));
}
};
}
public boolean isValueFormatReplacement()
{
return oldName.equals(newName);
}
}