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/*
* 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.
*
* Other licenses:
* -----------------------------------------------------------------------------
* Commercial licenses for this work are available. These replace the above
* ASL 2.0 and offer limited warranties, support, maintenance, and commercial
* database integrations.
*
* For more information, please visit: http://www.jooq.org/licenses
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
package org.jooq;
import java.io.Serializable;
import java.util.function.Function;
import org.jooq.exception.DataTypeException;
import org.jooq.impl.AbstractConverter;
import org.jooq.impl.IdentityConverter;
import org.jooq.impl.SQLDataType;
import org.jetbrains.annotations.ApiStatus.Internal;
import org.jetbrains.annotations.NotNull;
/**
* A chain of converters.
*
* @param The database type - i.e. any type available from
* {@link SQLDataType}
* @param The user type
* @author Lukas Eder
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public class Converters extends AbstractConverter {
final Converter[] chain;
/**
* Create an identity converter.
*/
@NotNull
public static Converter identity(final Class type) {
return new IdentityConverter(type);
}
/**
* Create an identity converter.
*
* @deprecated - [#10689] - 3.14.0 - This converter does not work. Do not
* use this method, use {@link #identity(Class)} instead.
*/
@Deprecated(forRemoval = true, since = "3.14")
@NotNull
public static Converter of() {
return new Converters();
}
/**
* Create a single converter.
*
* @deprecated - [#10689] - 3.14.0 - This method does not provide any useful
* functionality and will be removed in the future.
*/
@Deprecated(forRemoval = true, since = "3.14")
@NotNull
public static Converter of(Converter converter) {
return new Converters(converter);
}
/**
* Chain two converters.
*/
@NotNull
public static Converter of(Converter c1, Converter c2) {
return new Converters(c1, c2);
}
/**
* Chain three converters.
*/
@NotNull
public static Converter of(Converter c1, Converter c2, Converter c3) {
return new Converters(c1, c2, c3);
}
/**
* Chain four converters.
*/
@NotNull
public static Converter of(Converter c1, Converter c2, Converter c3, Converter c4) {
return new Converters(c1, c2, c3, c4);
}
/**
* Inverse a converter.
*/
public static Converter inverse(final Converter converter) {
// [#11099] Allow instanceof checks on IdentityConverter for performance reasons
if (converter instanceof IdentityConverter)
return (Converter) converter;
else
return Converter.of(converter.toType(), converter.fromType(), converter::to, converter::from);
}
/**
* Create a converter that can convert arrays with the component types being
* the argument converter's types.
*/
public static Converter forArrays(Converter converter) {
if (converter instanceof ArrayComponentConverter a)
return a.converter;
else
return new ArrayConverter<>(converter);
}
/**
* Create a converter that can convert component types based on the argument
* converter, which converts array types.
*/
public static Converter forArrayComponents(Converter converter) {
if (converter instanceof ArrayConverter a)
return a.converter;
else
return new ArrayComponentConverter<>(converter);
}
Converters(Converter... chain) {
super(chain[0].fromType(), chain[chain.length - 1].toType());
this.chain = chain;
}
@Override
public final U from(T t) {
Object result = t;
for (int i = 0; i < chain.length; i++)
result = chain[i].from(result);
return (U) result;
}
@Override
public final T to(U u) {
Object result = u;
for (int i = chain.length - 1; i >= 0; i--)
result = chain[i].to(result);
return (T) result;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
String separator = " -> ";
sb.append("Converters [ ");
sb.append(fromType().getName());
for (Converter converter : chain) {
sb.append(separator);
sb.append(converter.toType().getName());
}
sb.append(" ]");
return sb.toString();
}
static final Function nullable(Function f) {
return f instanceof Serializable
? (Function & Serializable) t -> t == null ? null
: f.apply(t) : t -> t == null ? null : f.apply(t);
}
static final Function notImplemented() {
return t -> { throw new DataTypeException("Conversion function not implemented"); };
}
/**
* An unknown type that is used when users do not provide any explicit user
* type {@link Class} reference e.g. in
* {@link DataType#asConvertedDataTypeFrom(Function)} or
* {@link DataType#asConvertedDataTypeTo(Function)}
*/
@Internal
public static final class UnknownType {
private UnknownType() {}
}
}
