com.datastax.driver.mapping.DefaultNamingStrategy Maven / Gradle / Ivy
/*
* Copyright DataStax, Inc.
*
* Licensed 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 com.datastax.driver.mapping;
import java.util.List;
/**
* A naming strategy that builds upon two naming conventions for the Java and Cassandra side.
*
* To infer a Cassandra name, the strategy will {@link NamingConvention#split(String) split} the
* Java name according to the Java convention, and then {@link NamingConvention#join(List) join} the
* resulting tokens according to the Cassandra convention. For example, a possible implementation
* might:
*
*
* - trim a prefix and tokenize on camel case: split("mUserName") = "user, name"
*
- join with a separator: join("user", "name") => "user_name"
*
*/
public class DefaultNamingStrategy implements NamingStrategy {
private NamingConvention javaConvention;
private NamingConvention cassandraConvention;
/**
* Builds a new instance with the default conventions, namely {@link
* NamingConventions#LOWER_CAMEL_CASE lower camel case} for the Java convention, and {@link
* NamingConventions#LOWER_CASE lower case} for the Cassandra convention.
*
* For example, a "userName" Java property will be mapped to a "username" column.
*/
public DefaultNamingStrategy() {
this(NamingConventions.LOWER_CAMEL_CASE, NamingConventions.LOWER_CASE);
}
/**
* Builds a new instance.
*
* @param javaConvention the naming convention that will be used to tokenize the Java property
* names.
* @param cassandraConvention the naming convention that will be used to build the Cassandra names
* from the Java tokens.
*/
public DefaultNamingStrategy(
NamingConvention javaConvention, NamingConvention cassandraConvention) {
if (javaConvention == null || cassandraConvention == null) {
throw new IllegalArgumentException("input/output NamingConvention cannot be null");
}
this.javaConvention = javaConvention;
this.cassandraConvention = cassandraConvention;
}
@Override
public String toCassandraName(String javaPropertyName) {
return cassandraConvention.join(javaConvention.split(javaPropertyName));
}
}