ADF工具类：TaskFlowUtils.java 源代码

package view;

import java.util.Collection;

import java.util.HashMap;

import java.util.Map;

import javax.faces.application.Application;
import javax.faces.context.FacesContext;

import oracle.adf.controller.ControllerContext;
import oracle.adf.controller.TaskFlowContext;
import oracle.adf.controller.TaskFlowId;
import oracle.adf.controller.ViewPortContext;
import oracle.adf.controller.metadata.MetadataService;
import oracle.adf.controller.metadata.model.DataControlScopeType;
import oracle.adf.controller.metadata.model.NamedParameter;
import oracle.adf.controller.metadata.model.TaskFlowDefinition;
import oracle.adf.controller.metadata.model.TaskFlowInputParameter;
import oracle.adf.controller.metadata.model.TransactionType;
import oracle.adf.model.BindingContext;
import oracle.adf.model.DataControlFrame;
import oracle.adf.model.binding.DCDataControl;
import oracle.adf.view.rich.context.AdfFacesContext;

/**
* ADF task flow utilities for use with JDev/ADF 11g+.
*
* Available under the Creative Commons Attribution 3.0 Unported License.
* See: http://one-size-doesnt-fit-all.blogspot.com/p/terms-conditions.html *
* Absolutely no warranty implied, *use*at*your*own*risk*.  This code has been mostly used
* for checking task flow features and hasn't been used in a production environment.
*
* Author: Chris Muir @ Oracle.com
* Date: 19th April 2012
*/
public class TaskFlowUtils {

public String getTaskFlowName() {
MetadataService metadataService = MetadataService.getInstance();
TaskFlowDefinition taskFlowDefinition = metadataService.getTaskFlowDefinition(getCurrentTaskFlowId());
String taskFlowName = null;
if (taskFlowDefinition != null) {
TaskFlowId taskFlowId = taskFlowDefinition.getTaskFlowId();

if (taskFlowId != null)
taskFlowName = taskFlowDefinition.getTaskFlowId().getFullyQualifiedName();
else
taskFlowName = "Null";
} else
taskFlowName = "Null";

return taskFlowName;
}

public String getTaskFlowControlScopeName() {
MetadataService metadataService = MetadataService.getInstance();
String controlScopeTypeString;
TaskFlowDefinition taskFlowDefinition = metadataService.getTaskFlowDefinition(getCurrentTaskFlowId());
if (taskFlowDefinition != null) {
String taskFlowName = taskFlowDefinition.getTaskFlowId().getFullyQualifiedName();
DataControlScopeType controlScopeType = taskFlowDefinition.getDataControlScopeType();

if (controlScopeType == null || controlScopeType == DataControlScopeType.SHARED)
controlScopeTypeString = "Shared Data Control Scope";
else if (controlScopeType == DataControlScopeType.ISOLATED)
controlScopeTypeString = "Isolated Data Control Scope";
else
controlScopeTypeString = "UNKNOWN Data Control Scope";
} else
controlScopeTypeString = "Null";

return controlScopeTypeString;
}

public String getTaskFlowControlTransactionTypeName() {
MetadataService metadataService = MetadataService.getInstance();
String transactionTypeString;
TaskFlowDefinition taskFlowDefinition = metadataService.getTaskFlowDefinition(getCurrentTaskFlowId());
if (taskFlowDefinition != null) {
String taskFlowName = taskFlowDefinition.getTaskFlowId().getFullyQualifiedName();

TransactionType transactionType = taskFlowDefinition.getTransactionType();

if (transactionType == null)
transactionTypeString = "-No Controller Transaction-";
else if (transactionType == TransactionType.NEW_TRANSACTION)
transactionTypeString = "Always Begin New Transaction";
else if (transactionType == TransactionType.REQUIRES_TRANSACTION)
transactionTypeString = "Use Existing Transaction if Possible";
else if (transactionType == TransactionType.REQUIRES_EXISTING_TRANSACTION)
transactionTypeString = "Always Use Existing Transaction";
else
transactionTypeString = "UNKNOWN Transaction Type";
} else
transactionTypeString = "Null";

return transactionTypeString;
}

public HashMap formatTaskFlowParameters(Map btfParameters) {
HashMap taskFlowParameterValues = new HashMap();

FacesContext facesContext = FacesContext.getCurrentInstance();
Application application = facesContext.getApplication();
AdfFacesContext adfFacesContext = AdfFacesContext.getCurrentInstance();
Map pageFlowScope = adfFacesContext.getPageFlowScope();

for (Object parameter : btfParameters.values()) {
NamedParameter namedParameter = (NamedParameter)parameter;
String parameterName = namedParameter.getName();
String parameterExpression = namedParameter.getValueExpression();
Object parameterValue;
String stringValue;

if (parameterExpression == null) {
parameterValue = pageFlowScope.get(parameterName);
} else {
parameterValue = application.evaluateExpressionGet(facesContext, parameterExpression, Object.class);
}

if (parameterValue != null) {
try {
stringValue = parameterValue.toString();
} catch (Exception e) {
stringValue = "";
}
} else {
stringValue = "";
}

taskFlowParameterValues.put(parameterName, stringValue);
}
return taskFlowParameterValues;
}

public TaskFlowId getCurrentTaskFlowId() {
ControllerContext controllerContext = ControllerContext.getInstance();
ViewPortContext currentViewPort = controllerContext.getCurrentViewPort();
TaskFlowContext taskFlowContext = currentViewPort.getTaskFlowContext();
TaskFlowId taskFlowId = taskFlowContext.getTaskFlowId();

return taskFlowId;
}

public TaskFlowDefinition getTaskFlowDefinition(TaskFlowId taskFlowId) {
MetadataService metadataService = MetadataService.getInstance();
TaskFlowDefinition taskFlowDefinition = metadataService.getTaskFlowDefinition(taskFlowId);

return taskFlowDefinition;
}

public Map getCurrentTaskFlowInputParameters() {
return getInputParameters(getCurrentTaskFlowId());
}

public Map getInputParameters(TaskFlowId taskFlowId) {
TaskFlowDefinition taskFlowDefinition = getTaskFlowDefinition(taskFlowId);
Map taskFlowInputParameters = taskFlowDefinition.getInputParameters();

return taskFlowInputParameters;
}

public Map getCurrentTaskFlowReturnParameters() {
return getReturnParameters(getCurrentTaskFlowId());
}

public Map getReturnParameters(TaskFlowId taskFlowId) {
TaskFlowDefinition taskFlowDefinition = getTaskFlowDefinition(taskFlowId);
Map namedParameters = taskFlowDefinition.getReturnValues();

return namedParameters;
}

public String getDataControlFrameName() {
BindingContext bindingContext = oracle.adf.controller.binding.BindingUtils.getBindingContext();
String dataControlFrameName = bindingContext.getCurrentDataControlFrame();

return dataControlFrameName;
}

public DataControlFrame getDataControlFrame() {
BindingContext bindingContext = oracle.adf.controller.binding.BindingUtils.getBindingContext();
String dataControlFrameName = bindingContext.getCurrentDataControlFrame();
DataControlFrame dataControlFrame = bindingContext.findDataControlFrame(dataControlFrameName);

return dataControlFrame;
}

public void commitTaskFlow() {
getDataControlFrame().commit();
}

public void rollbackTaskFlow() {
getDataControlFrame().rollback();
}

public boolean isTaskFlowTransactionDirty() {
return getDataControlFrame().isTransactionDirty();
}

public String getOpenTransactionName() {
return getDataControlFrame().getOpenTransactionName();
}

public String getDataControlNames() {
BindingContext bindingContext = oracle.adf.controller.binding.BindingUtils.getBindingContext();
String dataControlFrameName = bindingContext.getCurrentDataControlFrame();
DataControlFrame dataControlFrame = bindingContext.findDataControlFrame(dataControlFrameName);
Collection dataControls = dataControlFrame.datacontrols();
String names = "";
for (DCDataControl dc : dataControls) {
names = names + "," + dc.getName() + dc.hashCode();
}

return names;
}
}