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Team:Freiburg software/Code/DatastoreManager.java
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Revision as of 23:44, 21 October 2009 by JonasOnlyJonas (Talk | contribs)
/*
Copyright: synbiowave
License: GPL
Authors: Jörg Walossek
Version: 0.1
DESCRIPTION:
This class provides all methods needed for import and export data to an internal database.
*/
package org.synbiowave.database;
import java.util.List;
import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManager;
import javax.jdo.PersistenceManagerFactory;
import javax.jdo.Query;
import javax.jdo.Transaction;
// TODO: Auto-generated Javadoc
/**
* The Class DatastoreManager.
*/
public class DatastoreManager {
/** The Constant pmfInstance. */
private static final PersistenceManagerFactory pmfInstance=JDOHelper.getPersistenceManagerFactory("transactions-optional");
/**
* Instantiates a new datastore manager.
*/
public DatastoreManager(){}
/**
* Store.
*
* @param o the o
*
* @return the t
*
* @throws Exception the exception
*/
public static <T> T store(T o) throws Exception{
PersistenceManager pm=pmfInstance.getPersistenceManager();
Transaction tx=pm.currentTransaction();
try{
tx.begin();
pm.makePersistent(o);
tx.commit();}
finally{
if(tx.isActive()){
tx.rollback();
throw new Exception("Error storing object, sequence rollbacked.");}
pm.close();}
return o;}
/**
* Gets the all.
*
* @param o the o
*
* @return the all
*
* @throws Exception the exception
*/
@SuppressWarnings("unchecked")
public static <T> List<T> getAll(T o) throws Exception{ // add ordered params
List<T> results=null;
PersistenceManager pm=pmfInstance.getPersistenceManager();
Transaction tx=pm.currentTransaction();
try{
tx.begin();
Query q = pm.newQuery(o.getClass());
results = (List<T>) q.execute();
tx.commit();}
finally{
if(tx.isActive()){
tx.rollback();
throw new Exception("Error getting all objects, sequence rollbacked.");}
pm.close();}
return results;}
/**
* Gets the by id.
*
* @param o the o
* @param qID the q id
*
* @return the by id
*
* @throws Exception the exception
*/
@SuppressWarnings("unchecked")
public static <T> T getByID(T o,Long qID) throws Exception{
List<T> results=null;
PersistenceManager pm=pmfInstance.getPersistenceManager();
Transaction tx=pm.currentTransaction();
try{
tx.begin();
Query q = pm.newQuery(o.getClass(),"id == :qID");
results = (List<T>) q.execute(qID);
tx.commit();}
finally{
if(tx.isActive()){
tx.rollback();
throw new Exception("Error getting object by ID, sequence rollbacked.");}
pm.close();}
if(!results.isEmpty()){return results.get(0);}
else{return null;}}
/**
* Gets the by key value.
*
* @param o the o
* @param key the key
* @param value the value
*
* @return the by key value
*
* @throws Exception the exception
*/
@SuppressWarnings("unchecked")
public static <T> List<T> getByKeyValue(T o,String key,String value) throws Exception{ // add ordered params
List<T> results=null;
PersistenceManager pm=pmfInstance.getPersistenceManager();
Transaction tx=pm.currentTransaction();
try{
tx.begin();
Query q = pm.newQuery(o.getClass(),key+" == :qName");
results = (List<T>) q.execute(value);
tx.commit();}
finally{
if(tx.isActive()){
tx.rollback();
throw new Exception("Error getting object by key/value, sequence rollbacked.");}
pm.close();}
return results;}
/**
* Gets the greater than key value.
*
* @param o the o
* @param key the key
* @param value the value
*
* @return the greater than key value
*
* @throws Exception the exception
*/
@SuppressWarnings("unchecked")
public static <T> List<T> getGreaterThanKeyValue(T o,String key,String value) throws Exception{ // add ordered params
List<T> results=null;
PersistenceManager pm=pmfInstance.getPersistenceManager();
Transaction tx=pm.currentTransaction();
try{
tx.begin();
Query q = pm.newQuery(o.getClass(),key+" > :qName");
results = (List<T>) q.execute(value);
tx.commit();}
finally{
if(tx.isActive()){
tx.rollback();
throw new Exception("Error getting object greater than value, sequence rollbacked.");}
pm.close();}
return results;}
/**
* Delete.
*
* @param o the o
*
* @throws Exception the exception
*/
public static void delete(Object o) throws Exception{
PersistenceManager pm=pmfInstance.getPersistenceManager();
Transaction tx=pm.currentTransaction();
try{
tx.begin();
Object ps=(Object) pm.getObjectById(o);
pm.deletePersistent(ps);
tx.commit();}
finally{
if(tx.isActive()){
tx.rollback();
throw new Exception("Error deleting object, sequence rollbacked.");}
pm.close();}}
}
