Examples of org.apache.tapestry.form.IPropertySelectionModel

org.apache.tapestry.form.IPropertySelectionModel
Used by a {@link PropertySelection} to provide labels for options.
The component requires three different representations of each option:
- The option value, a Java object that will eventually be assigned to a property
- The label, a String which is incorprated into the HTML to identify the option to the user
- The value, a String which is used to represent the option as the value of the <option> or <input type=radio> generated by the {@link PropertySelection}.
The option is usually either an {@link org.apache.commons.lang.enum.Enum} (see {@link EnumPropertySelectionModel}) or some kind of business object. The label is often a property of the option object (for example, for a list of customers, it could be the customer name).
It should be easy to convert between the value and the option. It may simply be an index into an array. For business objects, it is often the primary key of the object, expressed as a String. @version $Id: IPropertySelectionModel.java 243791 2004-02-19 17:38:13Z hlship $ @author Howard Lewis Ship


    public void pageValidate(PageEvent event)
    {
        super.pageValidate(event);


        IPropertySelectionModel model = buildBooksModel();


        if (model.getOptionCount() == 0)
        {
            IRequestCycle cycle = getRequestCycle();
            IActivate page = (IActivate) cycle.getPage("MyLibrary");


            page.activate(cycle);

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        return result;
    }


    public void pageBeginRender(PageEvent event)
    {
        IPropertySelectionModel model = getBooksModel();


        if (model == null)
        {
            model = buildBooksModel();
            setBooksModel(model);

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    public void pageValidate(PageEvent event)
    {
        super.pageValidate(event);


        IPropertySelectionModel model = buildBooksModel();


        if (model.getOptionCount() == 0)
        {
            IRequestCycle cycle = getRequestCycle();
            IActivate page = (IActivate) cycle.getPage("MyLibrary");


            page.activate();

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        return result;
    }


    public void pageBeginRender(PageEvent event)
    {
        IPropertySelectionModel model = getBooksModel();


        if (model == null)
        {
            model = buildBooksModel();
            setBooksModel(model);

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    public void pageValidate(PageEvent event)
    {
        super.pageValidate(event);


        IPropertySelectionModel model = buildBooksModel();


        if (model.getOptionCount() == 0)
        {
            IRequestCycle cycle = getRequestCycle();
            IActivate page = (IActivate) cycle.getPage("MyLibrary");


            page.activate(cycle);

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        _availableWriter.println();


        // Each value specified in the model will go into either the selected or available
        // lists.


        IPropertySelectionModel model = getModel();


        int count = model.getOptionCount();
        for (int i = 0; i < count; i++)
        {
            IMarkupWriter w = _availableWriter;


            Object optionValue = model.getOption(i);


            if (selectedSet.contains(optionValue))
                w = _selectedWriter;


            w.begin("option");
            w.attribute("value", model.getValue(i));
            w.print(model.getLabel(i));
            w.end(); // <option>
            w.println();
        }


        // Close the <select> tags

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        if (count == 0)
            return;


        List selected = new ArrayList(count);
        IPropertySelectionModel model = getModel();


        for (int i = 0; i < count; i++)
        {
            String value = values[i];
            Object option = model.translateValue(value);


            selected.add(option);
        }


        setSelected(selected);

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        PaletteColumn selectedColumn = new PaletteColumn(getName(), getRows());


        // Each value specified in the model will go into either the selected or available
        // lists.


        IPropertySelectionModel model = getModel();


        int count = model.getOptionCount();


        for (int i = 0; i < count; i++)
        {
            Object optionValue = model.getOption(i);


            PaletteOption o = new PaletteOption(model.getValue(i), model.getLabel(i));


            int index = selected.indexOf(optionValue);
            boolean isSelected = index >= 0;


            if (sortUser && isSelected)

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        if (count == 0)
            return;


        List selected = new ArrayList(count);
        IPropertySelectionModel model = getModel();


        for (int i = 0; i < count; i++)
        {
            String value = values[i];
            Object option = model.translateValue(value);


            selected.add(option);
        }


        setSelected(selected);

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    {
        boolean render = !cycle.isRewinding();


        if (render)
        {
            IPropertySelectionModel model = getModel();


            writer.begin("select");


            writer.attribute("name", getName());


            renderInformalParameters(writer, cycle);


            writer.println();


            int count = model.getOptionCount();


            for (int i = 0; i < count; i++)
            {


                writer.begin("option");
                writer.attribute("value", model.getValue(i));


                writer.print(model.getLabel(i));


                writer.end();
                writer.println();
            }

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