org.springframework.data.relational.core.mapping.NamingStrategy Maven / Gradle / Ivy
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/*
* Copyright 2017-2023 the original author or authors.
*
* 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
*
* 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.
*/
package org.springframework.data.relational.core.mapping;
import org.springframework.data.relational.core.sql.IdentifierProcessing;
import org.springframework.data.util.ParsingUtils;
import org.springframework.util.Assert;
/**
* Interface and default implementation of a naming strategy. Defaults to no schema, table name based on {@link Class}
* and column name based on {@link RelationalPersistentProperty} with name parts of both separated by '_'.
*
* NOTE: Can also be used as an adapter. Create a lambda or an anonymous subclass and override any settings to implement
* a different strategy on the fly.
*
* @author Greg Turnquist
* @author Michael Simons
* @author Kazuki Shimizu
* @author Jens Schauder
* @author Oliver Gierke
* @author Kurt Niemi
*/
public interface NamingStrategy {
/**
* Empty implementation of the interface utilizing only the default implementation.
*
* Using this avoids creating essentially the same class over and over again.
*
* @deprecated use {@link DefaultNamingStrategy#INSTANCE} instead.
*/
@Deprecated(since = "2.4", forRemoval = true) NamingStrategy INSTANCE = DefaultNamingStrategy.INSTANCE;
/**
* Defaults to no schema.
*
* @return Empty String representing no schema
*/
default String getSchema() {
return "";
}
/**
* The name of the table to be used for persisting entities having the type passed as an argument. The default
* implementation takes the {@code type.getSimpleName()} and separates camel case parts with '_'.
*/
default String getTableName(Class type) {
Assert.notNull(type, "Type must not be null");
return ParsingUtils.reconcatenateCamelCase(type.getSimpleName(), "_");
}
/**
* Defaults to return the given {@link RelationalPersistentProperty}'s name with the parts of a camel case name
* separated by '_';
*/
default String getColumnName(RelationalPersistentProperty property) {
Assert.notNull(property, "Property must not be null");
return ParsingUtils.reconcatenateCamelCase(property.getName(), "_");
}
/**
* For a reference A -> B this is the name in the table for B which references A.
*
* @param property The property whose column name in the owner table is required
* @return a column name. Must not be {@code null}.
*/
default String getReverseColumnName(RelationalPersistentProperty property) {
Assert.notNull(property, "Property must not be null");
return property.getOwner().getTableName().getReference();
}
default String getReverseColumnName(PersistentPropertyPathExtension path) {
return getTableName(path.getIdDefiningParentPath().getRequiredLeafEntity().getType());
}
/**
* For a map valued reference A -> Map>X,B< this is the name of the column in the table for B holding the key of
* the map.
*
* @return name of the key column. Must not be {@code null}.
*/
default String getKeyColumn(RelationalPersistentProperty property) {
Assert.notNull(property, "Property must not be null");
return getReverseColumnName(property) + "_key";
}
}