ADFUtil

import com.sun.faces.mgbean.ManagedBeanCreationException;

import java.util.HashMap;
import java.util.Map;

import javax.el.ELContext;
import javax.el.Expression;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;
import javax.el.ValueExpression;

import javax.faces.application.FacesMessage;
import javax.faces.application.ViewHandler;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;

import javax.faces.event.PhaseId;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpSession;

import oracle.adf.model.BindingContext;
import oracle.adf.model.DataControlFrame;
import oracle.adf.model.binding.DCBindingContainer;
import oracle.adf.model.binding.DCDataControl;
import oracle.adf.view.rich.component.rich.RichPopup;
import oracle.adf.view.rich.component.rich.fragment.RichRegion;
import oracle.adf.view.rich.component.rich.layout.RichPanelSplitter;
import oracle.adf.view.rich.context.AdfFacesContext;

import org.apache.myfaces.trinidad.render.ExtendedRenderKitService;
import org.apache.myfaces.trinidad.util.Service;

/**
 * Provides various utility methods that are handy to
 * have around when working with ADF.
 */
public class ADFUtil {
    /**
     * When a bounded task flow manages a transaction (marked as
     * requires-transaction, requires-new-transaction, or requires-
     * existing-transaction), then the task flow must issue any
     * commits or rollbacks that are needed.
     * This is essentially to keep the state of the transaction that
     * the task flow understands in synch with the state of the
     * transaction in the ADFbc layer.
     * Use this method to issue a commit in the middle of a task flow
     * while staying in the task flow.
     */
    public static void saveAndContinue() {
        Map sessionMap =
            FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
        BindingContext context =
            (BindingContext)sessionMap.get(BindingContext.CONTEXT_ID);
        String currentFrameName = context.getCurrentDataControlFrame();
        DataControlFrame dcFrame =
            context.findDataControlFrame(currentFrameName);
        dcFrame.commit();
        dcFrame.beginTransaction(null);
    }

    /**
     * Programmatic evaluation of EL.
     *
     * @param el EL to evaluate
     * @return Result of the evaluation
     */
    public static Object evaluateEL(String el) {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext elContext = facesContext.getELContext();
        ExpressionFactory expressionFactory =
            facesContext.getApplication().getExpressionFactory();
        ValueExpression exp =
            expressionFactory.createValueExpression(elContext, el,
                                                    Object.class);
        if(exp == null || elContext == null){
            return null;
        }
        Object obj = null;
        try{
            obj = exp.getValue(elContext);
        }catch(ManagedBeanCreationException ex){
           
        }
        return obj;
    }

    public static String getLocaleValue(String el,String code){
            Map map = (Map)evaluateEL(el);
            if(map != null){
                if(map.get(code) != null)
                    return (String)map.get(code);
                else
                    return code;
            }
            return "";
        }
    /**
     * Programmatic invocation of a method that an EL evaluates to.
     * The method must not take any parameters.
     * @param el EL of the method to invoke
     * @return Object that the method returns
     */
    public static Object invokeEL(String el) {
        return invokeEL(el, new Class[0], new Object[0]);
    }

    /**
     * Programmatic invocation of a method that an EL evaluates to.
     *
     * @param el EL of the method to invoke
     * @param paramType Class defining the type of the
     * parameter
     * @param param Object defining the value of the
     * parameter
     * @return Object that the method returns
     */
    public static Object invokeEL(String el, Class paramType, Object param) {
        return invokeEL(el, new Class[] { paramType }, new Object[] { param });
    }


    /**
     * Programmatic invocation of a method that an EL evaluates to.
     *
     * @param el EL of the method to invoke
     * @param paramTypes Array of Class defining the types of the
     * parameters
     * @param params Array of Object defining the values of the
     * parametrs
     * @return Object that the method returns
     */
    public static Object invokeEL(String el, Class[] paramTypes,
                                  Object[] params) {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext elContext = facesContext.getELContext();
        ExpressionFactory expressionFactory =
            facesContext.getApplication().getExpressionFactory();
        MethodExpression exp =
            expressionFactory.createMethodExpression(elContext, el,
                                                     Object.class, paramTypes);
        return exp.invoke(elContext, params);
    }


    /**
     * Sets a value into an EL object. Provides similar
     * functionality to
     * the <af:setActionListener> tag, except the
     * <code>from</code> is
     * not an EL. You can get similar behavior by using the
     * following...<br>
     * <code>setEL(<b>to</b>, evaluateEL(<b>from</b>))</code>
     *
     * @param el EL object to assign a value
     * @param val Value to assign
     */
    public static void setEL(String el, Object val) {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ELContext elContext = facesContext.getELContext();
        ExpressionFactory expressionFactory =
            facesContext.getApplication().getExpressionFactory();
        ValueExpression exp =
            expressionFactory.createValueExpression(elContext, el,
                                                    Object.class);
        exp.setValue(elContext, val);
    }
   
    public static String errorDialog(String errorMessage)
    {      
        FacesContext context = FacesContext.getCurrentInstance();
        ((HttpSession)context.getExternalContext().getSession(false)).setAttribute("errorMessage", errorMessage);
        ViewHandler viewHandler = context.getApplication().getViewHandler();
        UIViewRoot dialog = viewHandler.createView(context, "/Error.jspx");        
        HashMap properties = new HashMap();
        properties.put("width", new Integer(250));
        properties.put("height", new Integer(150));    
        AdfFacesContext afContext = AdfFacesContext.getCurrentInstance();      
        afContext.launchDialog(dialog,
                null, // not launched from any component
                    null, // no particular parameters                                      
                        true,properties); // show it in a dialog
        context.renderResponse();
        return "";
    }
   
    /**
     *Get the ADF datacontrol reference given the control name
     * @param controlName data control name as given in data bindings file
     * @return
     */
    public static DCDataControl findDataControl(String controlName){
        DCBindingContainer context = (DCBindingContainer)ADFUtil.evaluateEL("#{bindings}");
        DCDataControl dcf = context.findDataControl(controlName);
        return dcf;
    }  
   
    /**
     * Initiates control flow in a task flow region.
     * @param region - RichRegion that represents taskflow.
     * @param outComeEl - action outcome, based on whic control flows
     */
    public static void performControlFlow(RichRegion region, String outComeEl){
        FacesContext ctx = FacesContext.getCurrentInstance();
        ExpressionFactory f = ctx.getApplication().getExpressionFactory();
        ELContext elctx = ctx.getELContext();
        MethodExpression m = f.createMethodExpression(elctx,outComeEl, String.class, new Class[]{});          
        region.queueActionEventInRegion(m,null,null,false,-1,-1,PhaseId.ANY_PHASE);
    }  
   
    public static HttpServletRequest getHttpServletRequest(){
        return ((HttpServletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest());
    }
   
    public static HttpSession getHttpSession(){
        return ((HttpSession)FacesContext.getCurrentInstance().getExternalContext().getSession(false));
    }
   
    /**
     * Returns the Binding Container
     * @return
     */
    public static DCBindingContainer getBindingContainer(){
        return (DCBindingContainer)evaluateEL("#{bindings}");
    }
   
    /**
     * Renders Faces message showing some validation error message.
     * @param id
     * @param message
     */
    public static void addFacesMessage(String id, FacesMessage message){
        FacesContext.getCurrentInstance().addMessage(id, message);
        FacesContext.getCurrentInstance().renderResponse();
    }
   
    public static void addFacesMessage(String clientId,javax.faces.application.FacesMessage.Severity severity,String localizedText){
        FacesContext.getCurrentInstance().addMessage(clientId, new FacesMessage(severity, "",localizedText));
        FacesContext.getCurrentInstance().renderResponse();
    }
   
    public static String showError(String clientId,String errorMessage) {      
       
        FacesContext ctx = FacesContext.getCurrentInstance();      
        StringBuilder javaScriptPopup =
            new StringBuilder("var popObj=AdfPage.PAGE.findComponent('" +
                              clientId + "');");
        javaScriptPopup.append("if(popObj != null){var errorField = popObj.findComponent('errorMessage');if(errorField != null)");
        javaScriptPopup.append("{errorField.setValue('");      
        javaScriptPopup.append(errorMessage);              
        javaScriptPopup.append("')}");
        javaScriptPopup.append("popObj.show();}");      
       
        ExtendedRenderKitService erks =
            Service.getRenderKitService(ctx, ExtendedRenderKitService.class);
        erks.addScript(ctx, javaScriptPopup.toString());
        ctx.renderResponse();
        return "";
    }
   
    public static void showPopup(String clientId){
        FacesContext ctx = FacesContext.getCurrentInstance();
        StringBuilder javaScriptPopup =
            new StringBuilder("var popObj=AdfPage.PAGE.findComponent('" +
                              clientId + "');");      
        javaScriptPopup.append("popObj.show();");      
       
        ExtendedRenderKitService erks =
            Service.getRenderKitService(ctx, ExtendedRenderKitService.class);
        erks.addScript(ctx, javaScriptPopup.toString());
        ctx.renderResponse();
    }
   
    public static void expandSpilter(RichPanelSplitter splitter){
        String clientId =splitter.getClientId(FacesContext.getCurrentInstance());
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ExtendedRenderKitService service = org.apache.myfaces.trinidad.util.Service.getRenderKitService(facesContext, ExtendedRenderKitService.class);
        StringBuilder script = new StringBuilder();      
        script.append("var panelSpliter = AdfPage.PAGE.findComponent('").append(clientId).append("');\n");      
        script.append("panelSpliter.setCollapsed('');\n");      
        service.addScript(facesContext, script.toString());
    }
   
    public static void collapseSplitter(RichPanelSplitter splitter){
        String clientId =splitter.getClientId(FacesContext.getCurrentInstance());
        FacesContext facesContext = FacesContext.getCurrentInstance();
        ExtendedRenderKitService service = org.apache.myfaces.trinidad.util.Service.getRenderKitService(facesContext, ExtendedRenderKitService.class);
        StringBuilder script = new StringBuilder();      
        script.append("var panelSpliter = AdfPage.PAGE.findComponent('").append(clientId).append("');\n");      
        script.append("panelSpliter.setCollapsed(true);\n");      
        service.addScript(facesContext, script.toString());
    }
   
    public static void closwBrowser(){
        FacesContext facesContext = FacesContext.getCurrentInstance();          
        ExtendedRenderKitService erks = Service.getRenderKitService(facesContext, ExtendedRenderKitService.class);
        StringBuilder sb=new StringBuilder("window.close();");
        erks.addScript(facesContext,sb.toString());
        facesContext.renderResponse();
    }
   
}