ColumnsView.java

/*
 * Copyright 2009-2014 PrimeTek.
 *
 * Licensed 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.primefaces.showcase.view.data.datatable;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.annotation.PostConstruct;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.faces.bean.ViewScoped;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import org.primefaces.showcase.domain.Car;
import org.primefaces.showcase.service.CarService;

@ManagedBean(name="dtColumnsView")
@ViewScoped
public class ColumnsView implements Serializable {
    
    private final static List<String> VALID_COLUMN_KEYS = Arrays.asList("id", "brand", "year", "color", "price");
	
    private String columnTemplate = "id brand year";
    
    private List<ColumnModel> columns;
    
    private List<Car> cars;
    
    private List<Car> filteredCars;
    
    @ManagedProperty("#{carService}")
    private CarService service;

    @PostConstruct
    public void init() {
        cars = service.createCars(10);
        
        createDynamicColumns();
    }
    
    public List<Car> getCars() {
        return cars;
    }

    public List<Car> getFilteredCars() {
        return filteredCars;
    }

    public void setFilteredCars(List<Car> filteredCars) {
        this.filteredCars = filteredCars;
    }

    public void setService(CarService service) {
        this.service = service;
    }

    public String getColumnTemplate() {
        return columnTemplate;
    }

    public void setColumnTemplate(String columnTemplate) {
        this.columnTemplate = columnTemplate;
    }

    public List<ColumnModel> getColumns() {
        return columns;
    }

    private void createDynamicColumns() {
        String[] columnKeys = columnTemplate.split(" ");
        columns = new ArrayList<ColumnModel>();   
        
        for(String columnKey : columnKeys) {
            String key = columnKey.trim();
            
            if(VALID_COLUMN_KEYS.contains(key)) {
                columns.add(new ColumnModel(columnKey.toUpperCase(), columnKey));
            }
        }
    }
    
    public void updateColumns() {
        //reset table state
        UIComponent table = FacesContext.getCurrentInstance().getViewRoot().findComponent(":form:cars");
        table.setValueExpression("sortBy", null);
        
        //update columns
        createDynamicColumns();
    }
    
    static public class ColumnModel implements Serializable {

        private String header;
        private String property;

        public ColumnModel(String header, String property) {
            this.header = header;
            this.property = property;
        }

        public String getHeader() {
            return header;
        }

        public String getProperty() {
            return property;
        }
    }
}