EDIT

package eu.etaxonomy.cdm.vaadin.model;

import java.io.Serializable;

import java.util.ArrayList;

import com.vaadin.data.Property;

import com.vaadin.data.Property.ValueChangeEvent;

import com.vaadin.data.util.BeanItem;

import com.vaadin.data.util.BeanItemContainer;

import com.vaadin.ui.Button;

import com.vaadin.ui.Button.ClickEvent;

import com.vaadin.ui.Button.ClickListener;

import com.vaadin.ui.CustomComponent;

import com.vaadin.ui.Form;

import com.vaadin.ui.HorizontalLayout;

import com.vaadin.ui.Label;

import com.vaadin.ui.Table;

import com.vaadin.ui.TextField;

import com.vaadin.ui.VerticalLayout;

public class BeanItemContainerExample extends CustomComponent  {

    private static final long serialVersionUID = -6235574698344484522L;

    public void init (String context) {

        VerticalLayout layout = new VerticalLayout();

        if ("basic".equals(context))

            basic(layout);

        else if ("addall".equals(context))

            addall(layout);

        else if ("dualbinding".equals(context))

            dualbinding(layout);

        else if ("beanupdate".equals(context))

            beanupdate(layout);

        else if ("nestedbean".equals(context))

            nestedbean(layout);

        else

            layout.addComponent(new Label("Invalid context: " + context));

        setCompositionRoot(layout);

    }

    // BEGIN-EXAMPLE: datamodel.container.beanitemcontainer.basic

    // Here is a bean

    public class Bean implements Serializable {

        private static final long serialVersionUID = -1520923107014804137L;

        String name;

        double energy; // Energy content in kJ/100g

        public Bean(String name, double energy) {

            this.name   = name;

            this.energy = energy;

        }

        public String getName() {

            return name;

        }

        public void setName(String name) {

            this.name = name;

        }

        public double getEnergy() {

            return energy;

        }

        public void setEnergy(double energy) {

            this.energy = energy;

        }

    }

    void basic(VerticalLayout layout) {

        // Create a container for such beans

        BeanItemContainer<Bean> beans =

            new BeanItemContainer<Bean>(Bean.class);

        // Add some beans to it

        beans.addBean(new Bean("Mung bean",   1452.0));

        beans.addBean(new Bean("Chickpea",    686.0));

        beans.addBean(new Bean("Lentil",      1477.0));

        beans.addBean(new Bean("Common bean", 129.0));

        beans.addBean(new Bean("Soybean",     1866.0));

        // Bind a table to it

        Table table = new Table("Beans of All Sorts", beans);

        layout.addComponent(table);

        // END-EXAMPLE: datamodel.container.beanitemcontainer.basic

        table.setPageLength(beans.size());

        table.setVisibleColumns(new Object[]{"name", "energy"});

    }

    void addall(VerticalLayout layout) {

        // BEGIN-EXAMPLE: datamodel.container.beanitemcontainer.addall

        // Have a collection with some beans

        ArrayList<Bean> beanlist = new ArrayList<Bean>();

        beanlist.add(new Bean("Mung bean",   1452.0));

        beanlist.add(new Bean("Chickpea",    686.0));

        beanlist.add(new Bean("Lentil",      1477.0));

        beanlist.add(new Bean("Common bean", 129.0));

        beanlist.add(new Bean("Soybean",     1866.0));

        // Create a container for the beans

        final BeanItemContainer<Bean> beans =

            new BeanItemContainer<Bean>(Bean.class);

        // Add them all

        beans.addAll(beanlist);

        // Bind a table to the container

        Table table = new Table("Beans of All Sorts", beans);

        layout.addComponent(table);

        // Have a button to empty and create some new items

        Button recreate = new Button("Recreate");

        recreate.addListener(new ClickListener() {

            private static final long serialVersionUID = 6823630748713272361L;

            @Override

            public void buttonClick(ClickEvent event) {

                beans.removeAllItems();

                ArrayList<Bean> beanlist = new ArrayList<Bean>();

                beanlist.add(new Bean("Space bean",   42.0));

                beanlist.add(new Bean("Moon bean",    388.0));

                beans.addAll(beanlist);

            }

        });

        layout.addComponent(recreate);

        // END-EXAMPLE: datamodel.container.beanitemcontainer.addall

        table.setPageLength(beans.size());

        table.setVisibleColumns(new Object[]{"name", "energy"});

    }

    public static final String dualbindingDescription =

        "<h1>Binding a bean both to a Table and a Form</h1>"+

        "<p>Editing the <b>BeanItem</b> in the form fires value change events, "+

        "which are communicated to the other components bound to the same data source, in this case the <b>Table</b>.</p>";

    @SuppressWarnings("unchecked")

    void dualbinding(VerticalLayout vlayout) {

        // BEGIN-EXAMPLE: datamodel.container.beanitemcontainer.dualbinding

        // Create a container for beans

        final BeanItemContainer<Bean> beans =

            new BeanItemContainer<Bean>(Bean.class);

        // Add some beans to it

        beans.addBean(new Bean("Mung bean",   1452.0));

        beans.addBean(new Bean("Chickpea",    686.0));

        beans.addBean(new Bean("Lentil",      1477.0));

        beans.addBean(new Bean("Common bean", 129.0));

        beans.addBean(new Bean("Soybean",     1866.0));

        // A layout for the table and form

        HorizontalLayout layout = new HorizontalLayout();

        // Bind a table to it

        final Table table = new Table("Beans of All Sorts", beans);

        table.setVisibleColumns(new Object[]{"name", "energy"});

        table.setPageLength(7);

        layout.addComponent(table);

        // Create a form for editing a selected or new item.

        // It is invisible until actually used.

        final Form form = new Form();

        form.setCaption("Edit Item");

        form.setVisible(false);

        layout.addComponent(form);

        // When the user selects an item, show it in the form

        table.addListener(new Property.ValueChangeListener() {

            private static final long serialVersionUID = 1162945655606583495L;

            public void valueChange(ValueChangeEvent event) {

                // Close the form if the item is deselected

                if (event.getProperty().getValue() == null) {

                    form.setVisible(false);

                    return;

                }

                // Bind the form to the selected item

                form.setItemDataSource(beans.getItem(table.getValue()));

                form.setVisible(true);

            }

        });

        table.setSelectable(true);

        table.setImmediate(true);

        // Creates a new bean for editing in the form before adding

        // it to the table. Adding is handled after committing

        // the form.

        final Button newBean = new Button("New Bean");

        newBean.addListener(new Button.ClickListener() {

            private static final long serialVersionUID = -7340189561756261036L;

            public void buttonClick(ClickEvent event) {

                // Create a new bean and bind it to the form

                Bean bean = new Bean(null, 0.0);

                BeanItem<Bean> item = new BeanItem<Bean>(bean);

                form.setItemDataSource(item);

                // Make the form a bit nicer

                form.setVisibleItemProperties(

                        new Object[]{"name", "energy"});

                ((TextField)form.getField("name"))

                        .setNullRepresentation("");

                table.select(null);

                table.setEnabled(false);

                newBean.setEnabled(false);

                form.setVisible(true);

            }

        });

        // When OK button is clicked, commit the form to the bean

        Button submit = new Button("OK");

        submit.addListener(new Button.ClickListener() {

            private static final long serialVersionUID = 6823630748713272361L;

            public void buttonClick(ClickEvent event) {

                form.commit();

                form.setVisible(false); // and close it

                // New items have to be added to the container

                if (table.getValue() == null) {

                    BeanItem<Bean> item =

                        (BeanItem<Bean>) form.getItemDataSource();

                    // This creates a new BeanItem

                    beans.addBean(item.getBean());

                    table.setEnabled(true);

                    newBean.setEnabled(true);

                }

            }

        });

        form.getFooter().addComponent(submit);

        Button cancel = new Button("Cancel");

        cancel.addListener(new Button.ClickListener() {

            private static final long serialVersionUID = -1749148888766063606L;

            public void buttonClick(ClickEvent event) {

                form.discard(); // Not really necessary

                form.setVisible(false); // and close it

                table.setEnabled(true);

                newBean.setEnabled(true);

            }

        });

        form.getFooter().addComponent(cancel);

        // END-EXAMPLE: datamodel.container.beanitemcontainer.dualbinding

        layout.setSpacing(true);

        vlayout.addComponent(layout);

        vlayout.addComponent(newBean);

    }

    void beanupdate(VerticalLayout vlayout) {

        // BEGIN-EXAMPLE: datamodel.container.beanitemcontainer.beanupdate

        // Create a container for beans

        final BeanItemContainer<Bean> beans =

            new BeanItemContainer<Bean>(Bean.class);

    }

    // BEGIN-EXAMPLE: datamodel.container.beanitemcontainer.nestedbean

    /** Bean to be nested */

    public class EqCoord implements Serializable {

        private static final long serialVersionUID = -3020840929725381667L;

        double rightAscension; /* In angle hours */

        double declination;    /* In degrees     */

        public EqCoord(double ra, double decl) {

            this.rightAscension = ra;

            this.declination    = decl;

        }

        public double getRightAscension() {

            return rightAscension;

        }

        public void setRightAscension(double rightAscension) {

            this.rightAscension = rightAscension;

        }

        public double getDeclination() {

            return declination;

        }

        public void setDeclination(double declination) {

            this.declination = declination;

        }

    }

    /** Bean containing a nested bean */

    public class Star implements Serializable {

        private static final long serialVersionUID = -312738461368736290L;

        String  name;

        EqCoord equatorial; /* Nested bean */

        public Star(String name, EqCoord equatorial) {

            this.name       = name;

            this.equatorial = equatorial;

        }

        public String getName() {

            return name;

        }

        public void setName(String name) {

            this.name = name;

        }

        /** Access to the nested bean. */

        public EqCoord getEquatorial() {

            return equatorial;

        }

        public void setEquatorial(EqCoord equatorial) {

            this.equatorial = equatorial;

        }

    }

    void nestedbean(VerticalLayout layout) {

        // Create a container for beans

        final BeanItemContainer<Star> stars =

            new BeanItemContainer<Star>(Star.class);

        // Declare the nested properties to be used in the container

        stars.addNestedContainerProperty("equatorial.rightAscension");

        stars.addNestedContainerProperty("equatorial.declination");

        // Add some items

        stars.addBean(new Star("Sirius",  new EqCoord(6.75, 16.71611)));

        stars.addBean(new Star("Polaris", new EqCoord(2.52, 89.26417)));

        // Put them in a table

        Table table = new Table("Stars", stars);

        table.setColumnHeader("equatorial.rightAscension", "RA");

        table.setColumnHeader("equatorial.declination",    "Decl");

        table.setPageLength(table.size());

        // Have to set explicitly to hide the "equatorial" property

        table.setVisibleColumns(new Object[]{"name",

            "equatorial.rightAscension", "equatorial.declination"});

        layout.addComponent(table);

    }        

    // END-EXAMPLE: datamodel.container.beanitemcontainer.nestedbean

}