Seam 3 & s:entityConverter

[mfillion]

Hi,

I'm a Seam 2 User. I'm trying Java EE 6 with Seam 3.
With the seam 2 stack, i use a lot the seam tag entityconverter, for example in h:selectonemenu
Is this tag present in Seam 3 (In seam faces module ?)

[msahin35]

You can use without s:conertEntity like this.

    <h:selectOneMenu  id="combooo"  value="#{widgetStoreHome.instance.activeWigdet}"   >
       <f:selectItems value="#{widgetHome.widgetList}" var="s"
                      itemLabel="#{s.id}" itemValue="#{s}">
       </f:selectItems>
  </h:selectOneMenu>
   <h:commandButton  action="#{widgetStoreHome.test}"></h:commandButton>   

import javax.annotation.Named;
import javax.faces.bean.ManagedBean;

import javax.faces.bean.SessionScoped;
/**
 *
 * @author msa
 */

@Named
@SessionScoped
@ManagedBean
public class WidgetStoreHome  extends HomeBean<WidgetStore>{

    
    
    public void test(){
    
    
    System.out.println(getInstance().getActiveWigdet());
    }
}

But if you have custom converter and this does not enough for requirements you can do this like this. In my other post. wait

[msahin35]

for example I have two entity class

public class Widget extends BaseObject
public class Widget2 extends BaseObject

be carefull both this classes have to equals method

@Entity

public class Widget extends BaseEntity 
{
   
   private String partNumber;
   private String name;
   private String description;
private Long id;
   @Id
   @GeneratedValue
   public Long getId()
   {
      return id;
   }

   public void setId(Long id)
   {
      this.id = id;
   }

   // demonstrates a column name override
   @Column(name = "partno")
   public String getPartNumber()
   {
      return partNumber;
   }

   public void setPartNumber(String partNumber)
   {
      this.partNumber = partNumber;
   }

   public String getName()
   {
      return name;
   }

   public void setName(String name)
   {
      this.name = name;
   }

   public String getDescription()
   {
      return description;
   }

   public void setDescription(String description)
   {
      this.description = description;
   }
   
   /** Default value included to remove warning.  Remove or modify at will.  */  
   private static final long serialVersionUID = 1L;
   
   *@Override
 public boolean equals(Object obj) {
  if (obj == null)
   return false;
  if (obj instanceof Widget) {
   Widget other = (Widget) obj;
   if (other.getId() == this.id )
    return true;
  }
  return false;
 }*

   public String toString(){
   
   
   return "I am a widget and my id is "+getId()+" and My name is "+getName();
   }
          
   public int hashCode() {
        return getId().intValue();
    }
}

import java.io.Serializable;

/**
 *
 * @author msa
 */
public class BaseEntity implements Serializable{
        private Long id;

   public Long getId()
   {
      return id;
   }

   public void setId(Long id)
   {
      this.id = id;
   }
     @Override
 public boolean equals(Object obj) {
  if (obj == null)
   return false;
  if (obj instanceof BaseEntity) {
   BaseEntity other = (BaseEntity) obj;
   if (other.getId() == this.id )
    return true;
  }
  return false;
 }
        
}

Both my classes extends baseObject so if I write a  base Object converter. So I can use it for 2 classes.

import com.common.helper.util.WeldHelperUtil;
import com.common.login.UserDatabase;
import java.io.Serializable;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ejb.Stateful;
import javax.enterprise.context.Dependent;
import javax.enterprise.inject.spi.BeanManager;
import javax.faces.bean.RequestScoped;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.jboss.weld.extensions.beanManager.BeanManagerAccessor;


/**
 *
 * @author msa
 */


@RequestScoped
@FacesConverter("baseObjectConverter")
@Stateful
public class BaseEntityConverter implements Converter,Serializable {

    
      HashMap<String,BaseEntity> map=new HashMap<String,BaseEntity>();
    
      
       
     @Override
     public Object getAsObject(FacesContext context, UIComponent component, String value) {
            Object obj=null;
        try {
            String values[] = value.split(":");
            
           Class className = Class.forName(values[0]);
           BeanManager beanManager =  BeanManagerAccessor.getManager();

                         
           WebEManager webEManager=    WeldHelperUtil.getContextualInstance(beanManager, WebEManager.class);
           System.out.print("webEManager: "+webEManager);
            

             
             
        long  id = Long.valueOf(values[1]);
            System.out.println("idddddddddd: "+id);
           
        
             
             try {
              obj=   webEManager.find(className, id);
              
              
             } catch (Exception e) {
                System.out.println("Exception"+e.getMessage());
             }
                  
           
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(BaseEntityConverter.class.getName()).log(Level.SEVERE, null, ex);
        }
        return obj;
     }

     @Override
     public String getAsString(FacesContext context, UIComponent component, Object value) {
            
            String     str = null;
            if(value!=null){
                  str=String.valueOf(""+value.getClass().getCanonicalName() + ":"     + ((BaseEntity)(value)).getId());
            }
            
                    
          return str;
     }
}

You can use like this

 <h:selectOneMenu  id="combooo" converter="baseObjectConverter" value="#{widgetStoreHome.instance.activeWigdet}"   >
       <f:selectItems value="#{widgetHome.widgetList}" var="s"
                      itemLabel="#{s.id}" itemValue="#{s}">
       </f:selectItems>
  </h:selectOneMenu>

You can inject an entty manager like this but. I could not success this in a converter. Like this methods below. İf some one knows please tell how.

     @Inject
       @Dependent
       @UserDatabase
     private  EntityManager entityManagerDao;
       @Inject
     protected WebEManager entityManagerDao3;
       @UserDatabase @PersistenceContext EntityManager entityManagerDao2;

But I had the entity manager like this.

WebEManager is my entity manager.

BeanManager beanManager =  BeanManagerAccessor.getManager();
WebEManager webEManager=    WeldHelperUtil.getContextualInstance(beanManager, WebEManager.class);
System.out.print("webEManager: "+webEManager);

import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;


/**
 *
 * @author msa
 */
public class WeldHelperUtil {

    
    @SuppressWarnings("unchecked")
public static <T> T getContextualInstance(final BeanManager manager, final Class<T> type)
{
    T result = null;
    Bean<T> bean = (Bean<T>) manager.resolve(manager.getBeans(type));
    if (bean != null)
    {
        CreationalContext<T> context = manager.createCreationalContext(bean);
        if (context != null)
        {
            result = (T) manager.getReference(bean, type, context);
        }
    }
    return result;
}
    
}

When page is rendering getAsString method works.
I am writing objects like this.

package.x.y.Widget:2
package.x.y.Widget:4
package.x.y.Widget:5
classname:objectId

when I clicked submit button.
Get as object method works.
I am parsing string.

 Class className = Class.forName(values[0]);
long  id = Long.valueOf(values[1]);

Loading classs

 Class className = Class.forName(values[0]);

Querying object

 obj=   webEManager.find(className, id);

I hope it helps. İf I am making something wrong I want to learn the right method. I did not use any try catch block apologize for that.

[mfillion]

Thanks for this example, it helps me a lot !