Examples of org.apache.tapestry5.ValueEncoder

org.apache.tapestry5.ioc.services.TypeCoercer
A ValueEncoder is used to convert server side objects to unique client-side strings (typically IDs) and back. This mechanism is widely used in Tapestry to allow you to work more seamlessly with objects rather than manually managing the encoding and decoding process throughout your application. Tapestry uses a ValueEncoder when generating an {@link org.apache.tapestry5.EventContext} as part of a URL, and whencomponents (such as {@link org.apache.tapestry5.corelib.components.Select}) need to generate unique client-side strings to be rendered within form elements.
Tapestry can automatically generate ValueEncoders for enums as well as Collections of any object types for which a coercion can be found from a formatted String, such as primitives, primitive wrappers, Dates, Calendars, "name=value" strings, and any types for which a custom coercion has been contributed.
Custom ValueEncoder implementations will need to be supplied for entity type objects. In such cases the {@link #toClient(Object)} method typically returnsan object's database primary key, and the {@link #toValue(String)}re-acquires the corresponding entity object, perhaps by doing a database lookup by that ID.
Some optional modules, such as Tapestry's own Hibernate and JPA modules, can automatically create a ValueEncoder for each of your entity types and then configure Tapestry to use them whenever a ValueEncoder is needed for those types. If you don't use one of those modules, you can still configure Tapestry to automatically use your custom ValueEncoder implementations by having your ValueEncoder implement the {@link org.apache.tapestry5.services.ValueEncoderFactory} interface and thencontributing a ValueEncoderSource that adds your encoder, like this, in your application's module class:
```
 public static void contributeValueEncoderSource( MappedConfiguration<Class<Color>, ValueEncoderFactory<Color>> configuration) { configuration.addInstance(Color.class, ColorEncoder.class); } 
```
@see SelectModel @see org.apache.tapestry5.services.ValueEncoderSource @see org.apache.tapestry5.services.ValueEncoderFactory @see org.apache.tapestry5.annotations.PageActivationContext

    @Primary
    private StackTraceElementAnalyzer frameAnalyzer;


    void setupRender()
    {
        ExceptionAnalysis analysis = analyzer.analyze(exception);


        stack = analysis.getExceptionInfos();


        toggleId = renderSupport.allocateClientId("toggleStack");
    }

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    @Test
    public void unknown_validator_type()
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        ComponentResources resources = mockComponentResources();
        Messages containerMessages = mockMessages();
        Map<String, Validator> map = newMap();

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    @Test
    public void validator_with_no_constraint() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        Messages messages = mockMessages();
        MessageFormatter formatter = mockMessageFormatter();
        Object inputValue = new Object();
        ComponentResources resources = mockComponentResources();

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    @Test
    public void component_messages_overrides_validator_messages() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        MessageFormatter formatter = mockMessageFormatter();
        Object inputValue = new Object();
        ComponentResources resources = mockComponentResources();
        Messages containerMessages = mockMessages();

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    @Test
    public void component_messages_overrides_validator_messages_per_form() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        MessageFormatter formatter = mockMessageFormatter();
        Object inputValue = new Object();
        ComponentResources resources = mockComponentResources();
        Messages containerMessages = mockMessages();

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    @Test
    public void constraint_value_from_message_catalog_per() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        Messages messages = mockMessages();
        MessageFormatter formatter = mockMessageFormatter();
        Object inputValue = new Object();
        ComponentResources resources = mockComponentResources();

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    @Test
    public void constraint_value_from_message_catalog_per_form() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        Messages messages = mockMessages();
        MessageFormatter formatter = mockMessageFormatter();
        Object inputValue = new Object();
        ComponentResources resources = mockComponentResources();

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    @Test
    public void missing_field_validator_constraint() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        ComponentResources resources = mockComponentResources();
        Messages containerMessages = mockMessages();
        FormSupport fs = mockFormSupport();

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    @Test
    public void single_validator_via_specification() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator validator = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        Messages messages = mockMessages();
        MessageFormatter formatter = mockMessageFormatter();
        Object inputValue = new Object();
        ComponentResources resources = mockComponentResources();

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    public void multiple_validators_via_specification() throws Exception
    {
        ValidationMessagesSource messagesSource = mockValidationMessagesSource();
        Validator required = mockValidator();
        Validator minLength = mockValidator();
        TypeCoercer coercer = mockTypeCoercer();
        FieldComponent field = newFieldComponent();
        Messages messages = mockMessages();
        MessageFormatter requiredFormatter = mockMessageFormatter();
        MessageFormatter minLengthFormatter = mockMessageFormatter();
        Object inputValue = "input value";

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org.apache.tapestry5.corelib.components.Palette

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