| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| package org.apache.empire.db.list; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.empire.commons.ClassUtils; |
| import org.apache.empire.db.DBCommand; |
| import org.apache.empire.db.DBContext; |
| import org.apache.empire.db.DBRecord; |
| import org.apache.empire.db.DBRecordBase; |
| import org.apache.empire.db.DBRecordBean; |
| import org.apache.empire.db.DBRecordData; |
| import org.apache.empire.db.DBRowSet; |
| import org.apache.empire.exceptions.InternalException; |
| import org.apache.empire.exceptions.InvalidPropertyException; |
| import org.apache.empire.exceptions.UnsupportedTypeException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * DBRecordListFactoryImpl |
| * Implements the DBRecordListFactory interface |
| * @author rainer |
| */ |
| public class DBRecordListFactoryImpl<T extends DBRecordBase> implements DBRecordListFactory<T> |
| { |
| // Logger |
| protected static final Logger log = LoggerFactory.getLogger(DBRecordListFactoryImpl.class); |
| |
| /** |
| * Finds a constructor for recordClass |
| * @param recordClass the DBRecord class to instantiate |
| * @param contextClass the context param |
| * @param rowsetClass the rowset param |
| * @return the constructor |
| */ |
| @SuppressWarnings("unchecked") |
| protected static <T extends DBRecordBase> Constructor<T> findRecordConstructor(Class<T> recordClass, Class<? extends DBContext> contextClass, Class<? extends DBRowSet> rowsetClass) |
| { |
| Constructor<?> constructor; |
| if (DBRecordBean.class.isAssignableFrom(recordClass)) |
| { // find standard constructor |
| constructor = ClassUtils.findMatchingConstructor(recordClass, 0); |
| } |
| else |
| { // try (context+rowset or just context) |
| constructor = ClassUtils.findMatchingConstructor(recordClass, 1, contextClass, rowsetClass); |
| if (constructor==null) |
| { // nothing suitable |
| throw new UnsupportedTypeException(recordClass); |
| } |
| } |
| // found |
| return (Constructor<T>)constructor; |
| } |
| |
| /* |
| * Members |
| */ |
| protected final Constructor<T> constructor; |
| protected final DBRowSet rowset; |
| |
| /** |
| * Constructs a DBRecordListFactoryImpl based on an DBRecord constructor |
| * @param constructor the DBRecord constructor |
| * @param context the database context |
| * @param rowset the rowset for the created records |
| */ |
| public DBRecordListFactoryImpl(Constructor<T> constructor, DBRowSet rowset) |
| { |
| this.constructor = constructor; |
| this.rowset = rowset; |
| } |
| |
| /** |
| * Constructs a DBRecordListFactoryImpl based on an DBRecord class |
| * @param recordClass the record class to be created for this list |
| * @param context the database context |
| * @param rowset the rowset for the created records |
| */ |
| public DBRecordListFactoryImpl(Class<T> recordClass, Class<? extends DBContext> contextClass, DBRowSet rowset) |
| { |
| this(findRecordConstructor(recordClass, contextClass, rowset.getClass()), rowset); |
| } |
| |
| @Override |
| public void prepareQuery(DBCommand cmd, DBContext context) |
| { |
| // complete select |
| if (cmd.hasSelectExpr()) |
| { // Already has select expressions. |
| // Check against Rowset |
| return; |
| } |
| // otherwise select |
| cmd.select(rowset.getColumns()); |
| } |
| |
| @Override |
| public List<T> newList(int capacity) |
| { |
| return new ArrayList<T>(capacity); |
| } |
| |
| @Override |
| public T newRecord(int rownum, DBRecordData recData) |
| { try |
| { // create item |
| T record; |
| switch(constructor.getParameterCount()) |
| { |
| case 2: record = constructor.newInstance(recData.getContext(), rowset);break; |
| case 1: record = constructor.newInstance(recData.getContext());break; |
| case 0: record = constructor.newInstance();break; |
| default: |
| throw new UnsupportedTypeException(constructor.getClass()); |
| } |
| // check |
| if ((record instanceof DBRecord) && !rowset.isSame(record.getRowSet())) |
| { // log warning |
| log.warn("DBRecordListFactoryImpl rowset ({}) and actual record rowset ({}) don't match!", rowset.getName(), record.getRowSet().getName()); |
| throw new InvalidPropertyException("rowset", record.getRowSet()); |
| } |
| rowset.initRecord(record, recData); |
| return record; |
| } |
| catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) |
| { |
| throw new InternalException(e); |
| } |
| } |
| |
| @Override |
| public void completeQuery(List<T> list) |
| { |
| /* Nothing */ |
| } |
| |
| } |