MIFOSX-97: refactor into command handling logic, prepare for sql based approach for change detection.

mifosng-provider/src/main/java/org/mifosng/platform/api/infrastructure/PortfolioApiDataConversionService.java

@@ -68,8 +68,7 @@ public interface PortfolioApiDataConversionService {
 
     LoanTransactionCommand convertJsonToLoanTransactionCommand(Long resourceIdentifier, String json);
 
-	AdjustLoanTransactionCommand convertJsonToAdjustLoanTransactionCommand(
-			Long loanId, Long transactionId, String json);
+    AdjustLoanTransactionCommand convertJsonToAdjustLoanTransactionCommand(Long loanId, Long transactionId, String json);
 
     OrganisationCurrencyCommand convertJsonToOrganisationCurrencyCommand(String json);
 
@@ -95,5 +94,5 @@ public interface PortfolioApiDataConversionService {
 
     CodeCommand convertJsonToCodeCommand(Long resourceIdentifier, String json);
 
-	SavingAccountCommand convertJsonToSavingAccountCommand(Long resourceIdentifier,String json);
+    SavingAccountCommand convertJsonToSavingAccountCommand(Long resourceIdentifier, String json);
 }

mifosng-provider/src/main/java/org/mifosng/platform/api/infrastructure/PortfolioApiJsonSerializerService.java

@@ -66,7 +66,8 @@ public interface PortfolioApiJsonSerializerService {
 
     String serializeOfficeDataToJson(boolean prettyPrint, Set<String> responseParameters, OfficeData office);
 
-	String serializeOfficeTransactionDataToJson(boolean prettyPrint, Set<String> responseParameters, Collection<OfficeTransactionData> officeTransactions);
+    String serializeOfficeTransactionDataToJson(boolean prettyPrint, Set<String> responseParameters,
+            Collection<OfficeTransactionData> officeTransactions);
 
     String serializeOfficeTransactionDataToJson(boolean prettyPrint, Set<String> responseParameters, OfficeTransactionData officeTransaction);
 
@@ -100,9 +101,11 @@ public interface PortfolioApiJsonSerializerService {
 
     String serializeClientDataToJson(boolean prettyPrint, Set<String> responseParameters, Collection<ClientData> clients);
 
-	String serializeClientAccountSummaryCollectionDataToJson(boolean prettyPrint, Set<String> responseParameters, ClientAccountSummaryCollectionData clientAccount);
+    String serializeClientAccountSummaryCollectionDataToJson(boolean prettyPrint, Set<String> responseParameters,
+            ClientAccountSummaryCollectionData clientAccount);
 
-    String serializeGroupAccountSummaryCollectionDataToJson(boolean prettyPrint, Set<String> responseParameters, GroupAccountSummaryCollectionData groupAccount);
+    String serializeGroupAccountSummaryCollectionDataToJson(boolean prettyPrint, Set<String> responseParameters,
+            GroupAccountSummaryCollectionData groupAccount);
 
     String serializeGroupDataToJson(boolean prettyPrint, Set<String> responseParameters, Collection<GroupData> groups);
 
@@ -118,7 +121,8 @@ public interface PortfolioApiJsonSerializerService {
 
     String serializeLoanTransactionDataToJson(boolean prettyPrint, Set<String> responseParameters, LoanTransactionData newTransactionData);
 
-    String serializeLoanReassignmentDataToJson(boolean prettyPrint, Set<String> responseParameters, LoanReassignmentData loanReassignmentData);
+    String serializeLoanReassignmentDataToJson(boolean prettyPrint, Set<String> responseParameters,
+            LoanReassignmentData loanReassignmentData);
 
     String serializeChargeDataToJson(boolean prettyPrint, Set<String> responseParameters, Collection<ChargeData> charges);
 
@@ -132,24 +136,27 @@ public interface PortfolioApiJsonSerializerService {
 
     String serializeEntityIdentifier(EntityIdentifier identifier);
 
-	String serializeClientIdentifierDataToJson(boolean prettyPrint, Set<String> responseParameters, Collection<ClientIdentifierData> clientIdentifiers);
+    String serializeClientIdentifierDataToJson(boolean prettyPrint, Set<String> responseParameters,
+            Collection<ClientIdentifierData> clientIdentifiers);
 
-	String serializeClientIdentifierDataToJson(boolean prettyPrint, Set<String> responseParameters, ClientIdentifierData clientIdentifierData);
+    String serializeClientIdentifierDataToJson(boolean prettyPrint, Set<String> responseParameters,
+            ClientIdentifierData clientIdentifierData);
 
     String serializeDocumentDataToJson(boolean prettyPrint, Set<String> responseParameters, Collection<DocumentData> documentDatas);
 
     String serializeDocumentDataToJson(boolean prettyPrint, Set<String> responseParameters, DocumentData documentData);
 
-	String serializeCodeDataToJson(boolean prettyPrint,Set<String> responseParameters, Collection<CodeData> codes);
+    String serializeCodeDataToJson(boolean prettyPrint, Set<String> responseParameters, Collection<CodeData> codes);
 
-	String serializeCodeDataToJson(boolean prettyPrint,Set<String> responseParameters, CodeData code);
+    String serializeCodeDataToJson(boolean prettyPrint, Set<String> responseParameters, CodeData code);
 
-	String serializeMakerCheckerDataToJson(boolean prettyPrint,Set<String> responseParameters, Collection<CommandSourceData> entries);
+    String serializeMakerCheckerDataToJson(boolean prettyPrint, Set<String> responseParameters, Collection<CommandSourceData> entries);
 
     String serializeSavingAccountsDataToJson(boolean prettyPrint, Set<String> responseParameters, SavingAccountData account);
 
     String serializeSavingAccountsDataToJson(boolean prettyPrint, Set<String> responseParameters, Collection<SavingAccountData> accounts);
 
-	// TODO - KW - might devide serialize up into portfolio and account to reduce interface
+    // TODO - KW - might devide serialize up into portfolio and account to
+    // reduce interface
     String serializeChartOfAccountDataToJson(boolean prettyPrint, Set<String> responseParameters, ChartOfAccountsData chartOfAccounts);
 }

mifosng-provider/src/main/java/org/mifosng/platform/client/service/ClientWritePlatformServiceJpaRepositoryImpl.java

@@ -49,17 +49,14 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
     private final NoteRepository noteRepository;
     private final CodeValueRepository codeValueRepository;
 
-	// FIXME - kw - this value is hardcoded for now but will be retrieved from configuration
+    // FIXME - kw - this value is hardcoded for now but will be retrieved from
+    // configuration
     private boolean makerCheckerEnabledForTask = false;
 
     @Autowired
-	public ClientWritePlatformServiceJpaRepositoryImpl(
-			final PlatformSecurityContext context,
-			final ClientRepository clientRepository,
-			final ClientIdentifierRepository clientIdentifierRepository,
-			final OfficeRepository officeRepository,
-			NoteRepository noteRepository,
-			final CodeValueRepository codeValueRepository) {
+    public ClientWritePlatformServiceJpaRepositoryImpl(final PlatformSecurityContext context, final ClientRepository clientRepository,
+            final ClientIdentifierRepository clientIdentifierRepository, final OfficeRepository officeRepository,
+            NoteRepository noteRepository, final CodeValueRepository codeValueRepository) {
         this.context = context;
         this.clientRepository = clientRepository;
         this.clientIdentifierRepository = clientIdentifierRepository;
@@ -74,16 +71,12 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
 
         final Long clientId = command.getId();
         final Client client = this.clientRepository.findOne(clientId);
-		if (client == null || client.isDeleted()) {
-			throw new ClientNotFoundException(clientId);
-		}
+        if (client == null || client.isDeleted()) { throw new ClientNotFoundException(clientId); }
 
         client.delete();
         this.clientRepository.save(client);
 
-		if (this.makerCheckerEnabledForTask && !command.isApprovedByChecker()) {
-			throw new RollbackTransactionAsCommandIsNotApprovedByCheckerException();
-		}
+        if (this.makerCheckerEnabledForTask && !command.isApprovedByChecker()) { throw new RollbackTransactionAsCommandIsNotApprovedByCheckerException(); }
 
         return new EntityIdentifier(client.getId());
     }
@@ -92,21 +85,15 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
      * Guaranteed to throw an exception no matter what the data integrity issue
      * is.
      */
-	private void handleDataIntegrityIssues(final ClientCommand command,
-			final DataIntegrityViolationException dve) {
+    private void handleDataIntegrityIssues(final ClientCommand command, final DataIntegrityViolationException dve) {
 
         Throwable realCause = dve.getMostSpecificCause();
-		if (realCause.getMessage().contains("external_id")) {
-			throw new PlatformDataIntegrityException(
-					"error.msg.client.duplicate.externalId",
-					"Client with externalId `" + command.getExternalId()
-							+ "` already exists", "externalId",
-					command.getExternalId());
-		}
+        if (realCause.getMessage().contains("external_id")) { throw new PlatformDataIntegrityException(
+                "error.msg.client.duplicate.externalId", "Client with externalId `" + command.getExternalId() + "` already exists",
+                "externalId", command.getExternalId()); }
 
         logger.error(dve.getMessage(), dve);
-		throw new PlatformDataIntegrityException(
-				"error.msg.client.unknown.data.integrity.issue",
+        throw new PlatformDataIntegrityException("error.msg.client.unknown.data.integrity.issue",
                 "Unknown data integrity issue with resource.");
     }
 
@@ -121,9 +108,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
             validator.validateForCreate();
 
             final Office clientOffice = this.officeRepository.findOne(command.getOfficeId());
-			if (clientOffice == null) {
-				throw new OfficeNotFoundException(command.getOfficeId());
-			}
+            if (clientOffice == null) { throw new OfficeNotFoundException(command.getOfficeId()); }
 
             String firstname = command.getFirstname();
             String lastname = command.getLastname();
@@ -132,15 +117,11 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
                 firstname = null;
             }
 
-			final Client newClient = Client
-					.newClient(clientOffice, firstname, lastname,
-							command.getJoiningDate(), command.getExternalId());
+            final Client newClient = Client.newClient(clientOffice, firstname, lastname, command.getJoiningDate(), command.getExternalId());
 
             this.clientRepository.save(newClient);
 
-			if (this.makerCheckerEnabledForTask && !command.isApprovedByChecker()) {
-				throw new RollbackTransactionAsCommandIsNotApprovedByCheckerException();
-			}
+            if (this.makerCheckerEnabledForTask && !command.isApprovedByChecker()) { throw new RollbackTransactionAsCommandIsNotApprovedByCheckerException(); }
 
             return newClient.getId();
         } catch (DataIntegrityViolationException dve) {
@@ -163,22 +144,16 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
             Long officeId = command.getOfficeId();
             if (command.isOfficeChanged() && officeId != null) {
                 clientOffice = this.officeRepository.findOne(officeId);
-				if (clientOffice == null) {
-					throw new OfficeNotFoundException(command.getOfficeId());
-				}
+                if (clientOffice == null) { throw new OfficeNotFoundException(command.getOfficeId()); }
             }
 
             final Client clientForUpdate = this.clientRepository.findOne(command.getId());
-			if (clientForUpdate == null || clientForUpdate.isDeleted()) {
-				throw new ClientNotFoundException(command.getId());
-			}
+            if (clientForUpdate == null || clientForUpdate.isDeleted()) { throw new ClientNotFoundException(command.getId()); }
             clientForUpdate.update(clientOffice, command);
 
             this.clientRepository.saveAndFlush(clientForUpdate);
 
-			if (this.makerCheckerEnabledForTask && !command.isApprovedByChecker()) {
-				throw new RollbackTransactionAsCommandIsNotApprovedByCheckerException();
-			}
+            if (this.makerCheckerEnabledForTask && !command.isApprovedByChecker()) { throw new RollbackTransactionAsCommandIsNotApprovedByCheckerException(); }
 
             return new EntityIdentifier(clientForUpdate.getId());
         } catch (DataIntegrityViolationException dve) {
@@ -194,9 +169,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
         context.authenticatedUser();
 
         final Client clientForUpdate = this.clientRepository.findOne(command.getClientId());
-		if (clientForUpdate == null) {
-			throw new ClientNotFoundException(command.getClientId());
-		}
+        if (clientForUpdate == null) { throw new ClientNotFoundException(command.getClientId()); }
 
         final Note note = Note.clientNote(clientForUpdate, command.getNote());
 
@@ -212,10 +185,8 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
         context.authenticatedUser();
 
         final Note noteForUpdate = this.noteRepository.findOne(command.getId());
-		if (noteForUpdate == null
-				|| noteForUpdate.isNotAgainstClientWithIdOf(command.getClientId())) {
-			throw new NoteNotFoundException(command.getId(),command.getClientId(), "client");
-		}
+        if (noteForUpdate == null || noteForUpdate.isNotAgainstClientWithIdOf(command.getClientId())) { throw new NoteNotFoundException(
+                command.getId(), command.getClientId(), "client"); }
 
         noteForUpdate.update(command.getNote());
 
@@ -237,18 +208,15 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
             validator.validateForCreate();
 
             final Client client = this.clientRepository.findOne(command.getClientId());
-			if (client == null || client.isDeleted()) {
-				throw new ClientNotFoundException(command.getClientId());
-			}
+            if (client == null || client.isDeleted()) { throw new ClientNotFoundException(command.getClientId()); }
 
             final CodeValue documentType = this.codeValueRepository.findOne(command.getDocumentTypeId());
-			if (documentType == null) {
-				throw new CodeValueNotFoundException(command.getDocumentTypeId());
-			}
+            if (documentType == null) { throw new CodeValueNotFoundException(command.getDocumentTypeId()); }
             documentTypeId = documentType.getId();
             documentTypeLabel = documentType.getLabel();
 
-			final ClientIdentifier clientIdentifier = ClientIdentifier.createNew(client, documentType, documentKey, command.getDescription());
+            final ClientIdentifier clientIdentifier = ClientIdentifier.createNew(client, documentType, documentKey,
+                    command.getDescription());
 
             this.clientIdentifierRepository.save(clientIdentifier);
 
@@ -277,19 +245,16 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
             documentTypeId = command.getDocumentTypeId();
             if (command.isDocumentTypeChanged() && documentTypeId != null) {
                 documentType = this.codeValueRepository.findOne(documentTypeId);
-				if (documentType == null) {
-					throw new CodeValueNotFoundException(command.getDocumentTypeId());
-				}
+                if (documentType == null) { throw new CodeValueNotFoundException(command.getDocumentTypeId()); }
                 documentTypeId = documentType.getId();
                 documentTypeLabel = documentType.getLabel();
             }
 
             final ClientIdentifier clientIdentifierForUpdate = this.clientIdentifierRepository.findOne(command.getId());
-			if (clientIdentifierForUpdate == null) {
-				throw new ClientIdentifierNotFoundException(command.getId());
-			}
+            if (clientIdentifierForUpdate == null) { throw new ClientIdentifierNotFoundException(command.getId()); }
 
-			// TODO - KW - why need to check what changed when integrity violation occurs?
+            // TODO - KW - why need to check what changed when integrity
+            // violation occurs?
             if (command.isDocumentTypeChanged() && command.isDocumentKeyChanged()) {
                 documentTypeId = command.getDocumentTypeId();
                 documentKey = command.getDocumentKey();
@@ -312,22 +277,17 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
         }
     }
 
-	private void handleClientIdentifierDataIntegrityViolation(
-			final String documentTypeLabel, 
-			final Long documentTypeId, 
-			final String documentKey,
-			final DataIntegrityViolationException dve) {
+    private void handleClientIdentifierDataIntegrityViolation(final String documentTypeLabel, final Long documentTypeId,
+            final String documentKey, final DataIntegrityViolationException dve) {
 
         if (dve.getMostSpecificCause().getMessage().contains("unique_client_identifier")) {
             throw new DuplicateClientIdentifierException(documentTypeLabel);
-		} else if (dve.getMostSpecificCause().getMessage().contains("unique_identifier_key")) {
-			throw new DuplicateClientIdentifierException(documentTypeId, documentTypeLabel, documentKey);
-		}
+        } else if (dve.getMostSpecificCause().getMessage().contains("unique_identifier_key")) { throw new DuplicateClientIdentifierException(
+                documentTypeId, documentTypeLabel, documentKey); }
 
         // only log as error if unexpected data integrity violation.
         logger.error(dve.getMessage(), dve);
-		throw new PlatformDataIntegrityException(
-				"error.msg.clientIdentifier.unknown.data.integrity.issue",
+        throw new PlatformDataIntegrityException("error.msg.clientIdentifier.unknown.data.integrity.issue",
                 "Unknown data integrity issue with resource.");
     }
 
@@ -335,9 +295,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
     @Override
     public EntityIdentifier deleteClientIdentifier(final Long clientIdentifierId) {
         final ClientIdentifier clientIdentifier = this.clientIdentifierRepository.findOne(clientIdentifierId);
-		if (clientIdentifier == null) {
-			throw new ClientIdentifierNotFoundException(clientIdentifierId);
-		}
+        if (clientIdentifier == null) { throw new ClientIdentifierNotFoundException(clientIdentifierId); }
         this.clientIdentifierRepository.delete(clientIdentifier);
 
         return new EntityIdentifier(clientIdentifierId);
@@ -345,16 +303,12 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
 
     @Transactional
     @Override
-	public EntityIdentifier saveOrUpdateClientImage(Long clientId,
-			String imageName, InputStream inputStream) {
+    public EntityIdentifier saveOrUpdateClientImage(Long clientId, String imageName, InputStream inputStream) {
         try {
             final Client client = this.clientRepository.findOne(clientId);
-			String imageUploadLocation = setupForClientImageUpdate(clientId,
-					client);
-
-			String imageLocation = FileUtils.saveToFileSystem(inputStream,
-					imageUploadLocation, imageName);
+            String imageUploadLocation = setupForClientImageUpdate(clientId, client);
 
+            String imageLocation = FileUtils.saveToFileSystem(inputStream, imageUploadLocation, imageName);
 
             return updateClientImage(clientId, client, imageLocation);
         } catch (IOException ioe) {
@@ -368,9 +322,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
     public EntityIdentifier deleteClientImage(final Long clientId) {
 
         final Client client = this.clientRepository.findOne(clientId);
-		if (client == null || client.isDeleted()) {
-			throw new ClientNotFoundException(clientId);
-		}
+        if (client == null || client.isDeleted()) { throw new ClientNotFoundException(clientId); }
 
         // delete image from the file system
         if (StringUtils.isNotEmpty(client.getImageKey())) {
@@ -395,9 +347,7 @@ public class ClientWritePlatformServiceJpaRepositoryImpl implements ClientWriteP
     }
 
     private String setupForClientImageUpdate(final Long clientId, final Client client) {
-		if (client == null || client.isDeleted()) {
-			throw new ClientNotFoundException(clientId);
-		}
+        if (client == null || client.isDeleted()) { throw new ClientNotFoundException(clientId); }
 
         final String imageUploadLocation = FileUtils.generateClientImageParentDirectory(clientId);
         // delete previous image from the file system

mifosng-provider/src/main/java/org/mifosng/platform/infrastructure/errorhandling/UnsupportedCommandException.java

@@ -0,0 +1,19 @@
+package org.mifosng.platform.infrastructure.errorhandling;
+
+
+/**
+ * A {@link RuntimeException} that is thrown in the case where an invalid or unknown
+ * command is attempted to be processed by platform. 
+ */
+public class UnsupportedCommandException extends RuntimeException {
+
+	private final String unsupportedCommandName;
+
+	public UnsupportedCommandException(final String unsupportedCommandName) {
+		this.unsupportedCommandName = unsupportedCommandName;
+	}
+
+	public String getUnsupportedCommandName() {
+		return unsupportedCommandName;
+	}
+}

mifosng-provider/src/main/java/org/mifosng/platform/infrastructure/errorhandling/UnsupportedCommandExceptionMapper.java

@@ -0,0 +1,42 @@
+package org.mifosng.platform.infrastructure.errorhandling;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import javax.ws.rs.core.Response.Status;
+import javax.ws.rs.ext.ExceptionMapper;
+import javax.ws.rs.ext.Provider;
+
+import org.mifosng.platform.api.data.ApiGlobalErrorResponse;
+import org.mifosng.platform.api.data.ApiParameterError;
+import org.springframework.context.annotation.Scope;
+import org.springframework.stereotype.Component;
+
+/**
+ * An {@link ExceptionMapper} to map {@link UnsupportedCommandException} thrown by platform into a HTTP API friendly format.
+ */
+@Provider
+@Component
+@Scope("singleton")
+public class UnsupportedCommandExceptionMapper implements ExceptionMapper<UnsupportedCommandException> {
+
+	@Override
+	public Response toResponse(final UnsupportedCommandException exception) {
+
+		List<ApiParameterError> errors = new ArrayList<ApiParameterError>();	
+		
+		StringBuilder validationErrorCode = new StringBuilder("error.msg.command.unsupported");
+		StringBuilder defaultEnglishMessage = new StringBuilder("The command ").append(exception.getUnsupportedCommandName()).append(" is not supported.");
+		ApiParameterError error = ApiParameterError.parameterError(validationErrorCode.toString(), defaultEnglishMessage.toString(), exception.getUnsupportedCommandName(), exception.getUnsupportedCommandName());
+		
+		errors.add(error);	
+		
+		ApiGlobalErrorResponse invalidParameterError = ApiGlobalErrorResponse.badClientRequest(
+				"validation.msg.validation.errors.exist",
+				"Validation errors exist.", errors);
+		
+		return Response.status(Status.BAD_REQUEST).entity(invalidParameterError).type(MediaType.APPLICATION_JSON).build();
+	}
+}

mifosng-provider/src/main/java/org/mifosng/platform/makerchecker/domain/CommandSource.java

@@ -31,13 +31,10 @@ public class CommandSource extends AbstractPersistable<Long> {
     @Column(name = "command_as_json", length = 1000)
     private String commandAsJson;
 
-	// should maker and checker be a staff member as opposed to just any application user?
-	@SuppressWarnings("unused")
     @ManyToOne
     @JoinColumn(name = "maker_id", nullable = false)
     private AppUser maker;
 
-	@SuppressWarnings("unused")
     @Column(name = "made_on_date", nullable = false)
     @Temporal(TemporalType.DATE)
     private Date madeOnDate;
@@ -52,11 +49,7 @@ public class CommandSource extends AbstractPersistable<Long> {
     @Temporal(TemporalType.DATE)
     private Date checkedOnDate;
 
-	public static CommandSource createdBy(
-			final String apiOperation,
-			final String resource,
-			final Long resourceId, 
-			final AppUser maker,
+    public static CommandSource createdBy(final String apiOperation, final String resource, final Long resourceId, final AppUser maker,
             final LocalDate madeOnDate) {
         return new CommandSource(apiOperation, resource, resourceId, maker, madeOnDate);
     }
@@ -65,11 +58,7 @@ public class CommandSource extends AbstractPersistable<Long> {
         //
     }
 
-	private CommandSource(
-			final String apiOperation,
-			final String resource,
-			final Long resourceId,
-			final AppUser maker,
+    private CommandSource(final String apiOperation, final String resource, final Long resourceId, final AppUser maker,
             final LocalDate madeOnDate) {
         this.apiOperation = StringUtils.defaultIfEmpty(apiOperation, null);
         this.resource = StringUtils.defaultIfEmpty(resource, null);
@@ -78,6 +67,14 @@ public class CommandSource extends AbstractPersistable<Long> {
         this.madeOnDate = madeOnDate.toDate();
     }
 
+    public CommandSource copy() {
+        LocalDate madeOnLocalDate = null;
+        if (this.madeOnDate != null) {
+            madeOnLocalDate = new LocalDate(this.madeOnDate);
+        }
+        return new CommandSource(this.apiOperation, this.resource, this.resourceId, this.maker, madeOnLocalDate);
+    }
+
     public void markAsChecked(final AppUser checker, final LocalDate checkedOnDate) {
         this.checker = checker;
         this.checkedOnDate = checkedOnDate.toDate();
@@ -99,6 +96,18 @@ public class CommandSource extends AbstractPersistable<Long> {
         return this.commandAsJson;
     }
 
+    public String commandName() {
+        return this.apiOperation + '-' + this.resource;
+    }
+    
+    public String resourceName() {
+        return this.resource;
+    }
+    
+    public String operation() {
+        return this.apiOperation;
+    }
+
     public boolean isClientResource() {
         return this.resource.equalsIgnoreCase("CLIENTS");
     }

mifosng-provider/src/main/java/org/mifosng/platform/makerchecker/service/ChangeDetectionService.java

@@ -0,0 +1,7 @@
+package org.mifosng.platform.makerchecker.service;
+
+public interface ChangeDetectionService {
+
+    String detectChanges(String operation, String resourceName, Long resourceId, String commandSerializedAsJson);
+
+}

mifosng-provider/src/main/java/org/mifosng/platform/makerchecker/service/ChangeDetectionServiceJdbc.java

@@ -0,0 +1,48 @@
+package org.mifosng.platform.makerchecker.service;
+
+import org.mifosng.platform.api.commands.ClientCommand;
+import org.mifosng.platform.api.data.ClientData;
+import org.mifosng.platform.api.infrastructure.PortfolioApiDataConversionService;
+import org.mifosng.platform.api.infrastructure.PortfolioApiJsonSerializerService;
+import org.mifosng.platform.client.service.ClientReadPlatformService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ChangeDetectionServiceJdbc implements ChangeDetectionService {
+
+    private final PortfolioApiDataConversionService apiDataConversionService;
+    private final PortfolioApiJsonSerializerService apiJsonSerializerService;
+    private final ClientReadPlatformService clientReadPlatformService;
+
+    @Autowired
+    public ChangeDetectionServiceJdbc(final PortfolioApiDataConversionService apiDataConversionService,
+            final PortfolioApiJsonSerializerService apiJsonSerializerService, final ClientReadPlatformService clientReadPlatformService) {
+        this.apiDataConversionService = apiDataConversionService;
+        this.apiJsonSerializerService = apiJsonSerializerService;
+        this.clientReadPlatformService = clientReadPlatformService;
+    }
+
+    @Override
+    public String detectChanges(final String operation, final String resourceName, final Long resourceId,
+            final String commandSerializedAsJson) {
+
+        String changesOnlyJson = "";
+
+        // FIXME - KW/JW - this change detection code for update of clients
+        // using ClientCommand can re placed when more suitable sql version is
+        // implemented.
+        final ClientData originalClient = this.clientReadPlatformService.retrieveIndividualClient(resourceId);
+        final ClientData changedClient = this.apiDataConversionService.convertInternalJsonFormatToClientDataChange(resourceId,
+                commandSerializedAsJson);
+
+        final String baseJson = this.apiJsonSerializerService.serializeClientDataToJson(originalClient);
+        final String workingJson = this.apiJsonSerializerService.serializeClientDataToJson(changedClient);
+        final ClientCommand changesOnly = this.apiDataConversionService.detectChanges(resourceId, baseJson, workingJson);
+
+        changesOnlyJson = this.apiJsonSerializerService.serializeClientCommandToJson(changesOnly);
+
+        return changesOnlyJson;
+    }
+
+}

mifosng-provider/src/main/java/org/mifosng/platform/makerchecker/service/ClientCommandHandler.java

@@ -0,0 +1,113 @@
+package org.mifosng.platform.makerchecker.service;
+
+import org.joda.time.LocalDate;
+import org.mifosng.platform.api.commands.ClientCommand;
+import org.mifosng.platform.api.data.EntityIdentifier;
+import org.mifosng.platform.api.infrastructure.PortfolioApiDataConversionService;
+import org.mifosng.platform.api.infrastructure.PortfolioApiJsonSerializerService;
+import org.mifosng.platform.client.service.ClientWritePlatformService;
+import org.mifosng.platform.client.service.RollbackTransactionAsCommandIsNotApprovedByCheckerException;
+import org.mifosng.platform.makerchecker.domain.CommandSource;
+import org.mifosng.platform.security.PlatformSecurityContext;
+import org.mifosng.platform.user.domain.AppUser;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ClientCommandHandler implements CommandSourceHandler {
+
+    private final PlatformSecurityContext context;
+    private final ChangeDetectionService changeDetectionService;
+    private final PortfolioApiDataConversionService apiDataConversionService;
+    private final PortfolioApiJsonSerializerService apiJsonSerializerService;
+    private final ClientWritePlatformService clientWritePlatformService;
+
+    @Autowired
+    public ClientCommandHandler(final PlatformSecurityContext context, final ChangeDetectionService changeDetectionService,
+            final PortfolioApiDataConversionService apiDataConversionService,
+            final PortfolioApiJsonSerializerService apiJsonSerializerService, final ClientWritePlatformService clientWritePlatformService) {
+        this.context = context;
+        this.changeDetectionService = changeDetectionService;
+        this.apiDataConversionService = apiDataConversionService;
+        this.apiJsonSerializerService = apiJsonSerializerService;
+        this.clientWritePlatformService = clientWritePlatformService;
+    }
+
+    public CommandSource handle(final CommandSource commandSource, final String apiRequestBodyInJson) {
+
+        final AppUser maker = context.authenticatedUser();
+        final LocalDate asToday = new LocalDate();
+
+        CommandSource commandSourceResult = commandSource.copy();
+
+        final Long resourceId = commandSource.resourceId();
+        Long newResourceId = null;
+
+        final ClientCommand command = this.apiDataConversionService.convertApiRequestJsonToClientCommand(resourceId, apiRequestBodyInJson);
+        final String commandSerializedAsJson = this.apiJsonSerializerService.serializeClientCommandToJson(command);
+        commandSourceResult.updateJsonTo(commandSerializedAsJson);
+
+        if (commandSource.isCreate()) {
+            try {
+                newResourceId = this.clientWritePlatformService.createClient(command);
+                commandSourceResult.markAsChecked(maker, asToday);
+                commandSourceResult.updateResourceId(newResourceId);
+            } catch (RollbackTransactionAsCommandIsNotApprovedByCheckerException e) {
+                // swallow this rollback transaction by design
+            }
+        } else if (commandSource.isUpdate()) {
+            try {
+                final String jsonOfChangesOnly = this.changeDetectionService.detectChanges(commandSource.operation(),
+                        commandSource.resourceName(), commandSource.resourceId(), commandSerializedAsJson);
+                commandSourceResult.updateJsonTo(jsonOfChangesOnly);
+
+                final ClientCommand changesOnly = this.apiDataConversionService.convertInternalJsonFormatToClientCommand(
+                        commandSource.resourceId(), jsonOfChangesOnly, false);
+
+                EntityIdentifier result = this.clientWritePlatformService.updateClientDetails(changesOnly);
+                newResourceId = result.getEntityId();
+
+                commandSourceResult.markAsChecked(maker, asToday);
+            } catch (RollbackTransactionAsCommandIsNotApprovedByCheckerException e) {
+                // swallow this rollback transaction by design
+            }
+        } else if (commandSource.isDelete()) {
+            try {
+                EntityIdentifier result = this.clientWritePlatformService.deleteClient(command);
+                newResourceId = result.getEntityId();
+                commandSourceResult.markAsChecked(maker, asToday);
+            } catch (RollbackTransactionAsCommandIsNotApprovedByCheckerException e) {
+                // swallow this rollback transaction by design
+            }
+        }
+
+        return commandSourceResult;
+    }
+
+    public CommandSource handle(final CommandSource commandSourceResult) {
+
+        Long resourceId = null;
+        if (commandSourceResult.isClientResource()) {
+            final ClientCommand command = this.apiDataConversionService.convertInternalJsonFormatToClientCommand(
+                    commandSourceResult.resourceId(), commandSourceResult.json(), true);
+
+            if (commandSourceResult.isCreate()) {
+                resourceId = this.clientWritePlatformService.createClient(command);
+            } else if (commandSourceResult.isUpdate()) {
+
+                // TODO - is there a case for doing change detection at this
+                // point also?
+
+                EntityIdentifier result = this.clientWritePlatformService.updateClientDetails(command);
+                resourceId = result.getEntityId();
+            } else if (commandSourceResult.isDelete()) {
+                EntityIdentifier result = this.clientWritePlatformService.deleteClient(command);
+                resourceId = result.getEntityId();
+            }
+        }
+
+        commandSourceResult.updateResourceId(resourceId);
+
+        return commandSourceResult;
+    }
+}

mifosng-provider/src/main/java/org/mifosng/platform/makerchecker/service/CommandSourceHandler.java

@@ -0,0 +1,5 @@
+package org.mifosng.platform.makerchecker.service;
+
+public interface CommandSourceHandler {
+
+}

mifosng-provider/src/main/java/org/mifosng/platform/makerchecker/service/CommandSourceHandlerDelegator.java

@@ -0,0 +1,48 @@
+package org.mifosng.platform.makerchecker.service;
+
+import org.mifosng.platform.infrastructure.errorhandling.UnsupportedCommandException;
+import org.mifosng.platform.makerchecker.domain.CommandSource;
+import org.mifosng.platform.security.PlatformSecurityContext;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+/**
+ * A class to delegate handling of commands to appropriate handler.
+ */
+@Service
+public class CommandSourceHandlerDelegator {
+
+    private final PlatformSecurityContext context;
+    private final ClientCommandHandler clientCommandHandler;
+
+    @Autowired
+    public CommandSourceHandlerDelegator(final PlatformSecurityContext context, final ClientCommandHandler clientCommandHandler) {
+        this.context = context;
+        this.clientCommandHandler = clientCommandHandler;
+    }
+
+    public CommandSource handle(final CommandSource commandSource, final String apiRequestBodyInJson) {
+
+        context.authenticatedUser();
+        CommandSource commandSourceResult = null;
+        if (commandSource.isClientResource()) {
+            commandSourceResult = clientCommandHandler.handle(commandSource, apiRequestBodyInJson);
+        } else {
+            throw new UnsupportedCommandException(commandSource.commandName());
+        }
+
+        return commandSourceResult;
+    }
+
+    public CommandSource handleExistingCommand(final CommandSource commandSource) {
+        
+        CommandSource commandSourceResult = null;
+        if (commandSource.isClientResource()) {
+            commandSourceResult = clientCommandHandler.handle(commandSource);
+        } else {
+            throw new UnsupportedCommandException(commandSource.commandName());
+        }
+
+        return commandSourceResult;
+    }
+}

mifosng-provider/src/main/java/org/mifosng/platform/makerchecker/service/PortfolioCommandSourceWriteServiceImpl.java

@@ -1,14 +1,7 @@
 package org.mifosng.platform.makerchecker.service;
 
 import org.joda.time.LocalDate;
-import org.mifosng.platform.api.commands.ClientCommand;
-import org.mifosng.platform.api.data.ClientData;
 import org.mifosng.platform.api.data.EntityIdentifier;
-import org.mifosng.platform.api.infrastructure.PortfolioApiDataConversionService;
-import org.mifosng.platform.api.infrastructure.PortfolioApiJsonSerializerService;
-import org.mifosng.platform.client.service.ClientReadPlatformService;
-import org.mifosng.platform.client.service.ClientWritePlatformService;
-import org.mifosng.platform.client.service.RollbackTransactionAsCommandIsNotApprovedByCheckerException;
 import org.mifosng.platform.makerchecker.domain.CommandSource;
 import org.mifosng.platform.makerchecker.domain.CommandSourceRepository;
 import org.mifosng.platform.security.PlatformSecurityContext;
@@ -22,86 +15,30 @@ public class PortfolioCommandSourceWriteServiceImpl implements PortfolioCommandS
 
     private final PlatformSecurityContext context;
     private final CommandSourceRepository commandSourceRepository;
-	private final PortfolioApiDataConversionService apiDataConversionService;
-	private final PortfolioApiJsonSerializerService apiJsonSerializerService;
-	private final ClientWritePlatformService clientWritePlatformService;
-	private final ClientReadPlatformService clientReadPlatformService;
+    private final CommandSourceHandlerDelegator commandSourceHandlerDelegator;
 
     @Autowired
-	public PortfolioCommandSourceWriteServiceImpl(final PlatformSecurityContext context, final CommandSourceRepository makerCheckerRepository,
-			final PortfolioApiDataConversionService apiDataConversionService,
-			final PortfolioApiJsonSerializerService apiJsonSerializerService,
-			final ClientWritePlatformService clientWritePlatformService,
-			final ClientReadPlatformService clientReadPlatformService) {
+    public PortfolioCommandSourceWriteServiceImpl(final PlatformSecurityContext context,
+            final CommandSourceRepository makerCheckerRepository, 
+            final CommandSourceHandlerDelegator commandSourceHandlerDelegator) {
         this.context = context;
         this.commandSourceRepository = makerCheckerRepository;
-		this.apiDataConversionService = apiDataConversionService;
-		this.apiJsonSerializerService = apiJsonSerializerService;
-		this.clientWritePlatformService = clientWritePlatformService;
-		this.clientReadPlatformService = clientReadPlatformService;
+        this.commandSourceHandlerDelegator = commandSourceHandlerDelegator;
     }
 
     // NOT TRANSACTIONAL BY DESIGN FOR NOW
     @Override
-	public EntityIdentifier logCommandSource(final String apiOperation, final String resource, final Long resourceId, final String jsonRequestBody) {
+    public EntityIdentifier logCommandSource(final String apiOperation, final String resource, final Long resourceId,
+            final String apiRequestBodyInJson) {
 
         final AppUser maker = context.authenticatedUser();
-		
         final LocalDate asToday = new LocalDate();
 
-		final CommandSource commandSource = CommandSource.createdBy(apiOperation, resource, resourceId, maker, asToday);
+        final CommandSource commandSourceInput = CommandSource.createdBy(apiOperation, resource, resourceId, maker, asToday);
+        final CommandSource commandSourceResult = this.commandSourceHandlerDelegator.handle(commandSourceInput, apiRequestBodyInJson);
+        commandSourceRepository.save(commandSourceResult);
 
-		Long newResourceId = null;
-		if (commandSource.isClientResource()) {
-			
-			// translate incoming api request json into java object catering for local and dateFormat parts of api
-			final ClientCommand command = this.apiDataConversionService.convertApiRequestJsonToClientCommand(resourceId, jsonRequestBody);
-			// produce serialized json of internal java object representation for persistence.
-			final String internalCommandSerializedAsJson = this.apiJsonSerializerService.serializeClientCommandToJson(command);
-			commandSource.updateJsonTo(internalCommandSerializedAsJson);
-			
-			if (commandSource.isCreate()) {
-				try {
-					newResourceId = this.clientWritePlatformService.createClient(command);
-					commandSource.markAsChecked(maker, asToday);
-					commandSource.updateResourceId(newResourceId);
-					} catch (RollbackTransactionAsCommandIsNotApprovedByCheckerException e) {
-						// swallow this rollback transaction by design
-					}
-			} else if (commandSource.isUpdate()) {
-				try {
-					// useful to employ change detection on update scenario to only store what details have changed
-					final ClientData originalClient = this.clientReadPlatformService.retrieveIndividualClient(resourceId);
-					final ClientData changedClient = this.apiDataConversionService.convertInternalJsonFormatToClientDataChange(resourceId, internalCommandSerializedAsJson);
-
-					final String baseJson = this.apiJsonSerializerService.serializeClientDataToJson(originalClient);
-					final String workingJson = this.apiJsonSerializerService.serializeClientDataToJson(changedClient);
-					final ClientCommand changesOnly = this.apiDataConversionService.detectChanges(resourceId, baseJson, workingJson);
-
-					final String changesOnlyJson = this.apiJsonSerializerService.serializeClientCommandToJson(changesOnly);
-					commandSource.updateJsonTo(changesOnlyJson);
-					
-					EntityIdentifier result = this.clientWritePlatformService.updateClientDetails(changesOnly);
-					newResourceId = result.getEntityId();
-					
-					commandSource.markAsChecked(maker, asToday);
-				} catch (RollbackTransactionAsCommandIsNotApprovedByCheckerException e) {
-					// swallow this rollback transaction by design
-				}
-			} else if (commandSource.isDelete()) {
-				try {
-					EntityIdentifier result = this.clientWritePlatformService.deleteClient(command);
-					newResourceId = result.getEntityId();
-					commandSource.markAsChecked(maker, asToday);
-				} catch (RollbackTransactionAsCommandIsNotApprovedByCheckerException e) {
-					// swallow this rollback transaction by design
-				}
-			}
-		}
-		
-		commandSourceRepository.save(commandSource);
-		
-		return EntityIdentifier.makerChecker(newResourceId, commandSource.getId());
+        return EntityIdentifier.makerChecker(commandSourceResult.resourceId(), commandSourceResult.getId());
     }
 
     @Transactional
@@ -110,28 +47,14 @@ public class PortfolioCommandSourceWriteServiceImpl implements PortfolioCommandS
 
         final AppUser checker = context.authenticatedUser();
 
-		final CommandSource entity = this.commandSourceRepository.findOne(id);
-		entity.markAsChecked(checker, new LocalDate());
+        final CommandSource commandSourceInput = this.commandSourceRepository.findOne(id);
+        commandSourceInput.markAsChecked(checker, new LocalDate());
 
-		Long resourceId = null;
-		if (entity.isClientResource()) {
-			final ClientCommand command = this.apiDataConversionService.convertInternalJsonFormatToClientCommand(entity.resourceId(), entity.json(), true);
-			if (entity.isCreate()) {
-				resourceId = this.clientWritePlatformService.createClient(command);
-			} else if (entity.isUpdate()) {
-				EntityIdentifier result = this.clientWritePlatformService.updateClientDetails(command);
-				resourceId = result.getEntityId();
-			} else if (entity.isDelete()) {
-				EntityIdentifier result = this.clientWritePlatformService.deleteClient(command);
-				resourceId = result.getEntityId();
-			}
-		}
+        final CommandSource commandSourceResult = this.commandSourceHandlerDelegator.handleExistingCommand(commandSourceInput);
         
-		entity.updateResourceId(resourceId);
+        commandSourceRepository.save(commandSourceResult);
 
-		commandSourceRepository.save(entity);
-		
-		return EntityIdentifier.makerChecker(resourceId, entity.getId());
+        return EntityIdentifier.makerChecker(commandSourceResult.resourceId(), commandSourceResult.getId());
     }
 
     @Transactional