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;    }}