org.jooq.impl.DefaultRecordUnmapper 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
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
package org.jooq.impl;
import static org.jooq.impl.Tools.getAnnotatedGetter;
import static org.jooq.impl.Tools.getAnnotatedMembers;
import static org.jooq.impl.Tools.getMatchingGetter;
import static org.jooq.impl.Tools.getMatchingMembers;
import static org.jooq.impl.Tools.hasColumnAnnotations;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;
import org.jooq.Configuration;
import org.jooq.Field;
import org.jooq.Record;
import org.jooq.RecordType;
import org.jooq.RecordUnmapper;
import org.jooq.exception.MappingException;
/**
* A default implementation for unmapping a custom type to a {@link Record}.
*
* This default implementation currently supports unmapping the following types
* to a {@link Record}:
*
*
* - {@link Map}: See also {@link Record#fromMap(Map)}
* Object[]: See also {@link Record#fromArray(Object...)}- POJOs: See also {@link Record#from(Object)}
*
*
* @author Lukas Eder
*/
public class DefaultRecordUnmapper implements RecordUnmapper {
private final Class type;
private final RecordType rowType;
private final Field[] fields;
private final Configuration configuration;
private RecordUnmapper delegate;
public DefaultRecordUnmapper(Class type, RecordType rowType, Configuration configuration) {
this.type = type;
this.rowType = rowType;
this.fields = rowType.fields();
this.configuration = configuration;
init();
}
private final void init() {
if (type.isArray())
delegate = new ArrayUnmapper();
else if (Map.class.isAssignableFrom(type))
delegate = new MapUnmapper();
else
delegate = new PojoUnmapper();
}
@Override
public final R unmap(E source) {
return delegate.unmap(source);
}
private final Record newRecord() {
return DSL.using(configuration).newRecord(rowType.fields());
}
private static final void setValue(Record record, Object source, java.lang.reflect.Field member, Field field)
throws IllegalAccessException {
Class mType = member.getType();
if (mType.isPrimitive()) {
if (mType == byte.class) {
Tools.setValue(record, field, member.getByte(source));
}
else if (mType == short.class) {
Tools.setValue(record, field, member.getShort(source));
}
else if (mType == int.class) {
Tools.setValue(record, field, member.getInt(source));
}
else if (mType == long.class) {
Tools.setValue(record, field, member.getLong(source));
}
else if (mType == float.class) {
Tools.setValue(record, field, member.getFloat(source));
}
else if (mType == double.class) {
Tools.setValue(record, field, member.getDouble(source));
}
else if (mType == boolean.class) {
Tools.setValue(record, field, member.getBoolean(source));
}
else if (mType == char.class) {
Tools.setValue(record, field, member.getChar(source));
}
}
else {
Tools.setValue(record, field, member.get(source));
}
}
private final class ArrayUnmapper implements RecordUnmapper {
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
public final R unmap(E source) {
if (source == null)
return null;
if (source instanceof Object[]) {
Object[] array = (Object[]) source;
int size = rowType.size();
Record record = newRecord();
for (int i = 0; i < size && i < array.length; i++) {
Field field = rowType.field(i);
if (rowType.field(field) != null)
Tools.setValue(record, field, array[i]);
}
return (R) record;
}
throw new MappingException("Object[] expected. Got: " + source.getClass());
}
}
private final class MapUnmapper implements RecordUnmapper {
@SuppressWarnings("unchecked")
@Override
public R unmap(E source) {
if (source == null)
return null;
// [#1987] Distinguish between various types to load data from
// Maps are loaded using a {field-name -> value} convention
if (source instanceof Map) {
Map map = (Map) source;
Record record = newRecord();
for (int i = 0; i < fields.length; i++) {
String name = fields[i].getName();
// Set only those values contained in the map
if (map.containsKey(name))
Tools.setValue(record, fields[i], map.get(name));
}
return (R) record;
}
throw new MappingException("Map expected. Got: " + source.getClass());
}
}
private final class PojoUnmapper implements RecordUnmapper {
@SuppressWarnings("unchecked")
@Override
public R unmap(E source) {
if (source == null)
return null;
Record record = newRecord();
try {
boolean useAnnotations = hasColumnAnnotations(configuration, type);
for (Field field : fields) {
List members;
Method method;
// Annotations are available and present
if (useAnnotations) {
members = getAnnotatedMembers(configuration, type, field.getName());
method = getAnnotatedGetter(configuration, type, field.getName());
}
// No annotations are present
else {
members = getMatchingMembers(configuration, type, field.getName());
method = getMatchingGetter(configuration, type, field.getName());
}
// Use only the first applicable method or member
if (method != null) {
Tools.setValue(record, field, method.invoke(source));
}
else if (members.size() > 0) {
setValue(record, source, members.get(0), field);
}
}
return (R) record;
}
// All reflection exceptions are intercepted
catch (Exception e) {
throw new MappingException("An error ocurred when mapping record from " + type, e);
}
}
}
}