[Tapestry Wiki] Update of "Tapestry5HowToAddMessageFormatPrefix" by FilipSAdamsen

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The following page has been changed by FilipSAdamsen:
http://wiki.apache.org/tapestry/Tapestry5HowToAddMessageFormatPrefix

New page:
This page describes how to add a messageformat prefix to Tapestry 5.

The messageformat prefix allows you to specify values to use in a message 
inline like this:
{{{
${messageformat:key,value1,value2} or <t:component 
t:parameter="messageformat:key,value1,value2">
}}}

First create the class !MessageFormatBindingFactory:

{{{
public class MessageFormatBindingFactory implements BindingFactory {

  private final BindingSource bindingSource;

  public MessageFormatBindingFactory(BindingSource bindingSource) {
    this.bindingSource = bindingSource;
  }

  public Binding newBinding(String description, ComponentResources container, 
ComponentResources component,
                            String expression, Location location) {
    String key = expression.substring(0, expression.indexOf(','));
    String[] parts = expression.substring(expression.indexOf(',') + 
1).split(",");

    Object[] values = new Object[parts.length];
    for (int i = 0; i < parts.length; i++) {
      String part = parts[i];
      String prefix = TapestryConstants.PROP_BINDING_PREFIX;

      if ('\'' == part.charAt(0) && '\'' == part.charAt(part.length() - 1)) {
        part = part.substring(1, part.length() - 1);
        prefix = TapestryConstants.LITERAL_BINDING_PREFIX;
      }

      values[i] = bindingSource.newBinding(description, container, component, 
prefix, part, location).get();
    }

    String messageValue = container.getMessages().format(key, values);

    return new LiteralBinding(description, messageValue, location) {

      @Override
      public boolean isInvariant() {
        return false;
      }
    };
  }
}
}}}

And then contribute it to the BindingSource configuration:

{{{
  public static void contributeBindingSource(MappedConfiguration<String, 
BindingFactory> configuration,
                                             BindingSource bindingSource) {
    configuration.add("messageformat", new 
MessageFormatBindingFactory(bindingSource));
  }
}}}

A few things to note about the use of this prefix:

 1. Literal values should be enclosed in single quotes, and
 2. it is possible to use other prefixes for the values.

That's all there is to it.

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