server/io.spine.server.entity.storage/AbstractColumnMapping

AbstractColumnMapping

public abstract class AbstractColumnMapping<R> implements ColumnMapping<R>

The basic implementation of mapping rules for entity columns.

Since entity columns are proto-based and have a limited amount of possible types, this class allows descendants to override concrete type mapping rules in a convenient way.

Some of the types are expected to be mapped in a way so they support the ordering comparison operators ("greater than", "less than or equals", etc.). For details, see io.spine.client.Filters.

Inheritors

DefaultColumnMapping

Constructors

AbstractColumnMapping

public void AbstractColumnMapping()

Functions

public ColumnTypeMapping<T, ? extends R> of<T>(Class<T> type)

Obtains the mapping rules for the given type.

protected abstract ColumnTypeMapping<Boolean, ? extends R> ofBoolean()

Returns the mapping rules of Boolean columns.

protected abstract ColumnTypeMapping<ByteString, ? extends R> ofByteString()

Returns the mapping rules of ByteString columns.

protected abstract ColumnTypeMapping<Double, ? extends R> ofDouble()

Returns the mapping rules of Double columns.

protected abstract ColumnTypeMapping<Enum<? extends Object>, ? extends R> ofEnum()

Returns the mapping rules of Enum columns.

protected abstract ColumnTypeMapping<Float, ? extends R> ofFloat()

Returns the mapping rules of Float columns.

protected abstract ColumnTypeMapping<Integer, ? extends R> ofInteger()

Returns the mapping rules of Integer columns.

protected abstract ColumnTypeMapping<Long, ? extends R> ofLong()

Returns the mapping rules of Long columns.

protected abstract ColumnTypeMapping<Message, ? extends R> ofMessage()

Returns the mapping rules of Message columns.

protected abstract ColumnTypeMapping<String, ? extends R> ofString()

Returns the mapping rules of String columns.

setupCustomMapping

protected void setupCustomMapping(Builder<Class<?>, ColumnTypeMapping<?, ? extends R>> builder)

Allows to specify custom mapping rules.

unsupportedType

protected IllegalArgumentException unsupportedType(Class<? extends Object> aClass)

Throws an exception about an unsupported column type.

Inherited functions

public abstract ColumnTypeMapping<? extends Object, ? extends R> ofNull()

Obtains the mapping rules of null.