ADF_193：Task Flow使用指南之七：SavePoints（2）

运行环境：JDeveloper 11.1.1.1.6 + Oracle Database 10g Express Edition 10.2.0.1。

上一个实验使用的是EL表达式：#{controllerContext.savePointManager.createSavePoint}创建SavePoints。
本实验使用Java Method创建SavePoints，并且使用下拉列表显示所有的SavePoints，用户可以选择Restore哪一个SavePoint。


完整的Managed Bean代码如下：

package view;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.faces.event.ActionEvent;
import javax.faces.model.SelectItem;

import oracle.adf.controller.ControllerContext;
import oracle.adf.controller.savepoint.SavePointAttributes;
import oracle.adf.controller.savepoint.SavePointManager;
import oracle.adf.model.BindingContext;
import oracle.adf.model.binding.DCBindingContainer;

import oracle.adf.model.binding.DCIteratorBinding;
import oracle.adf.share.ADFContext;

import oracle.adf.view.rich.component.rich.data.RichTable;

import oracle.binding.BindingContainer;

import oracle.jbo.Row;

public class MyBackingBean {
    private ControllerContext cc;
    private SavePointManager spm;

    public MyBackingBean() {
        cc = ControllerContext.getInstance();
        spm = cc.getSavePointManager();
    }

    public List getSavepoints() {
        List options;
        options = new ArrayList();
        List saves = spm.listSavePointIds();
        SelectItem option;
        for (int i = 0; i < saves.size(); i++) {
            SavePointAttributes att = spm.getSavePointAttributes(saves.get(i));
            option =
                    new SelectItem(saves.get(i), saves.get(i) + "_" + att.getName());
            options.add(option);
        }
        return options;
    }

    public void clearSavepoints(ActionEvent actionEvent) {
        spm.clearSavePoints();
    }

    public void createSavePoint() {
        String saveId =
            spm.createSavePoint(new SavePointAttributes("Employee", "Employee's Save Point",
                                                        null));
        System.out.println("##### Save point is being set " + saveId);
        ADFContext.getCurrent().getPageFlowScope().put("savePointId", saveId);
    }

    public Map getCurrentEmployeeInfo() {
        Map map = new HashMap();
        DCBindingContainer bindings = (DCBindingContainer)getBindings();
        DCIteratorBinding dcIb =
            bindings.findIteratorBinding("EmployeesView1Iterator");
        Row row = dcIb.getCurrentRow();
        map.put("EmployeeId", row.getAttribute("EmployeeId"));
        map.put("DepartmentId", row.getAttribute("DepartmentId"));
        return map;
    }

    public BindingContainer getBindings() {
        return BindingContext.getCurrent().getCurrentBindingsEntry();
    }
}

Project 下载：ADF_TaskFlow_SavePoints_Explicit(2).7z