/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.click.examples.page.cayenne;
import java.util.List;
import javax.annotation.Resource;
import org.apache.cayenne.DataObject;
import org.apache.click.control.Column;
import org.apache.click.control.TextField;
import org.apache.click.examples.domain.Course;
import org.apache.click.examples.domain.Student;
import org.apache.click.examples.service.StudentService;
import org.apache.click.extras.control.PickList;
import org.springframework.stereotype.Component;
/**
* This example demonstrates how to represent a many-to-many relationship
* between Students and Courses using Apache Click.
*
* A Student can take many Courses, and a Course can be taken by many Students.
*
* The relationship is managed by a PickList control.
*/
@Component
public class EnrollmentDemo extends FormTablePage {
private static final long serialVersionUID = 1L;
@Resource(name="studentService")
private StudentService studentService;
private PickList pickList;
// Event Handlers ---------------------------------------------------------
/**
* @see FormTablePage#onInit()
*/
public void onInit() {
form.add(new TextField("name")).setRequired(true);
pickList = new PickList("courseList", "Courses");
pickList.addAll(studentService.getCourses(), "id", "name");
form.add(pickList);
// Table
table.addColumn(new Column("id"));
table.addColumn(new Column("name"));
super.onInit();
}
/**
* @see FormTablePage#onSaveClick()
*/
public boolean onSaveClick() {
if (form.isValid()) {
Student student = (Student) form.getDataObject();
List courseIds = pickList.getSelectedValues();
studentService.setStudentCourses(student, courseIds);
saveDataObject(student);
clear();
}
return true;
}
/**
* @see FormTablePage#onEditClick()
*/
public boolean onEditClick() {
Student student = getSelectedStudent();
// If no student is selected, exist early
if (student == null) {
return true;
}
// Add each student course to the PickList
List courses = student.getCourses();
for (int i = 0; i < courses.size(); i++) {
Course course = (Course) courses.get(i);
pickList.addSelectedValue(course.getId().toString());
}
form.setDataObject(student);
return true;
}
// Public Methods ---------------------------------------------------------
/**
* @see FormTablePage#clear()
*/
@Override
public void clear() {
pickList.setSelectedValues(null);
super.clear();
}
/**
* @see FormTablePage#getDataObject(Object)
*/
@Override
public DataObject getDataObject(Object id) {
return studentService.getStudent(id);
}
/**
* @see FormTablePage#getDataObjectClass()
*/
@Override
public Class getDataObjectClass() {
return Student.class;
}
/**
* @see FormTablePage#getRowList()
*/
@Override
public List getRowList() {
return studentService.getStudents();
}
/**
* Return the selected student or null if no student is selected.
*
* @return the selected student or null if no student is selected
*/
private Student getSelectedStudent() {
Student student = null;
Integer id = editLink.getValueInteger();
if (id != null) {
student = (Student) getDataObject(id);
}
return student;
}
}