org.jooq.Converters Maven / Gradle / Ivy
/*
* 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
*
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*/
package org.jooq;
import org.jooq.impl.SQLDataType;
/**
* 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 implements Converter {
/**
* Generated UID
*/
private static final long serialVersionUID = -4307758248063822630L;
final Converter[] chain;
/**
* Create an identity converter.
*/
public static Converter identity(final Class type) {
return new Converter() {
/**
* Generated UID
*/
private static final long serialVersionUID = -8331976721627671263L;
@Override
public final T from(T t) {
return t;
}
@Override
public final T to(T t) {
return t;
}
@Override
public final Class fromType() {
return type;
}
@Override
public final Class toType() {
return type;
}
};
}
/**
* Create an identity converter.
*/
public static Converter of() {
return new Converters();
}
/**
* Create a single converter.
*/
public static Converter of(Converter converter) {
return new Converters(converter);
}
/**
* Chain two converters.
*/
public static Converter of(Converter c1, Converter c2) {
return new Converters(c1, c2);
}
/**
* Chain three converters.
*/
public static Converter of(Converter c1, Converter c2, Converter c3) {
return new Converters(c1, c2, c3);
}
/**
* Chain four converters.
*/
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) {
return new Converter() {
/**
* Generated UID
*/
private static final long serialVersionUID = -4307758248063822630L;
@Override
public T from(U u) {
return converter.to(u);
}
@Override
public U to(T t) {
return converter.from(t);
}
@Override
public Class fromType() {
return converter.toType();
}
@Override
public Class toType() {
return converter.fromType();
}
@Override
public String toString() {
return "InverseConverter [ " + fromType().getName() + " -> " + toType().getName() + " ]";
}
};
}
Converters(Converter... chain) {
this.chain = chain == null ? new Converter[0] : 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 final Class fromType() {
return chain[0].fromType();
}
@Override
public final Class toType() {
return chain[chain.length - 1].toType();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
String separator = " -> ";
sb.append("Converters [ ");
sb.append(chain[0].fromType().getName());
for (Converter converter : chain) {
sb.append(separator);
sb.append(converter.toType().getName());
}
sb.append(" ]");
return sb.toString();
}
}