Collector is a simple utility to manage collections declaratively, collector requires a collection and a value to work with. It’s important to override equals and hashCode methods of the value object to make collector work.
Even you would be adding a certain object into list of the same type of that object, however, you have the ability of adding a certain object into list from the same kind by using the Collector component, so no need for defining a method for doing the add operation.
1. The View
index.xhtml
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head>
<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<f:view>
<h:form prependId="false">
<h1>JavaBeat Primefaces Example</h1>
<h2>Primefaces - Collector </h2>
<h:panelGrid columns="2">
<h:outputText value="Enter Name:"/>
<p:inputText value="#{registrationBean.user.name}"/>
<h:outputText value="Enter Age:"/>
<p:inputText value="#{registrationBean.user.age}"/>
<h:outputText value="Enter Status [Example A, B, C or D]:"/>
<p:inputText value="#{registrationBean.user.status}"/>
</h:panelGrid>
<p:commandButton value="Add" ajax="false">
<p:collector value="#{registrationBean.user}" unique="false" addTo="#{registrationBean.users}"></p:collector>
</p:commandButton>
<br/>
<br/>
<br/>
<p:dataTable id="dataTable" value="#{registrationBean.users}" var="user" border="1">
<p:column>
<f:facet name="header">
<h:outputText value="Name"/>
</f:facet>
<h:outputText value="#{user.name}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Status"/>
</f:facet>
<h:outputText value="#{user.status}"/>
</p:column>
</p:dataTable>
</h:form>
</f:view>
</html>
2. User Data Type
User.java
package net.javabeat.primefaces.data;
public class User {
private String name;
private String age;
private String status;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
}
3. The Managed Bean
RegistrationBean.java
package net.javabeat.primefaces;
import java.util.ArrayList;
import java.util.List;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import net.javabeat.primefaces.data.User;
@ManagedBean
@SessionScoped
public class RegistrationBean {
private List<User> users = new ArrayList<User>();
private User user = new User();
public List<User> getUsers() {
return users;
}
public void setUsers(List<User> users) {
this.users = users;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
4. Primefaces Collector Example Demo
The below snapshot show you the using of Collector for adding a certain object into defined list.
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