Signature Capture : SignatureRecordDAO.java

SignatureRecordDAO.java

package com.mindstorm.signaturecapture.dao;

import java.util.Date;
import java.util.List;

import javax.jdo.PersistenceManager;
import javax.jdo.Query;

import com.google.appengine.api.datastore.Text;
import com.mindstorm.signaturecapture.entity.SignatureRecord;
import com.mindstorm.signaturecapture.utils.PMF;

public enum SignatureRecordDAO {
        INSTANCE;
        public List<SignatureRecord> getSignatureRecords() {
                List<SignatureRecord> SignatureRecords;
                PersistenceManager pm = PMF.get().getPersistenceManager();
                Query query = pm.newQuery(SignatureRecord.class);
                try {
                        SignatureRecords = (List<SignatureRecord>) query.execute();
                        System.out.println("Number of SignatureRecords: " + SignatureRecords.size());
        } finally {
            pm.close();
        }

                return (SignatureRecords);
        }
        
        public Long add(String receiverName, 
                                String signature) {
                
                SignatureRecord _record = new SignatureRecord();
                _record.setReceiverName(receiverName);
                _record.setSignature(new Text(signature));
                _record.setLastUpdate(new Date());
                synchronized (this) {
                        PersistenceManager pm = PMF.get().getPersistenceManager();
                        try {
                    pm.makePersistent(_record);
                } finally {
                    pm.close();
                }
                }
                
                return (_record.getSignatureID().getId());
        }
        
        public void deleteAll() {
                List<SignatureRecord> SignatureRecords;
                PersistenceManager pm = PMF.get().getPersistenceManager();
                Query query = pm.newQuery(SignatureRecord.class);
                try {
                        SignatureRecords = (List<SignatureRecord>) query.execute();
                        pm.deletePersistentAll(SignatureRecords);
        } finally {
            pm.close();
        }
        }
}