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Spring Data Relational support
/*
* Copyright 2019-2023 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.dialect;
/**
* Interface declaring methods that express how a dialect supports array-typed columns.
*
* @author Mark Paluch
* @since 1.1
*/
public interface ArrayColumns {
/**
* Returns {@literal true} if the dialect supports array-typed columns.
*
* @return {@literal true} if the dialect supports array-typed columns.
*/
boolean isSupported();
/**
* Translate the {@link Class user type} of an array into the dialect-specific type. This method considers only the
* component type.
*
* @param userType component type of the array.
* @return the dialect-supported array type.
* @throws UnsupportedOperationException if array typed columns are not supported.
* @throws IllegalArgumentException if the {@code userType} is not a supported array type.
*/
Class getArrayType(Class userType);
/**
* Default {@link ArrayColumns} implementation for dialects that do not support array-typed columns.
*/
enum Unsupported implements ArrayColumns {
INSTANCE;
@Override
public boolean isSupported() {
return false;
}
@Override
public Class getArrayType(Class userType) {
throw new UnsupportedOperationException("Array types not supported");
}
}
/**
* Unwrap the nested {@link Class#getComponentType()} from a given {@link Class}.
*
* @param clazz the type to inspect.
* @return the unwrapped component type.
* @since 3.0
*/
static Class unwrapComponentType(Class clazz) {
Class componentType = clazz;
while (componentType.isArray()) {
componentType = componentType.getComponentType();
}
return componentType;
}
}