com.google.gwt.uibinder.attributeparsers

Class FieldReferenceConverter

java.lang.Object

com.google.gwt.uibinder.attributeparsers.FieldReferenceConverter

public class FieldReferenceConverter
extends Object

Deals with field references, e.g. the bits in braces here: <div class="{style.enabled} fancy {style.impressive}" />, by converting them to java expressions (with the help of a Delegate).

A field reference is one or more segments separated by dots. The first segment is considered to be a reference to a ui field, and succeeding segments are method calls. So, "{able.baker.charlie}" becomes "able.baker().charlie()".

A field reference starts with '{' and is followed immediately by a character that can legally start a java identifier—that is a letter, $, or underscore. Braces not followed by such a character are left in place.

For convenience when dealing with generated CssResources, field segments with dashes are converted to camel case. That is, {able.baker-charlie} is the same as {able.bakerCharlie}

Double mustaches (i.e. "{{..}}") are not matched as references to play well with modern templating systems.

Opening braces may be escape by slash. That is, "\{foo}" will converted to "{foo}", with no field reference detected.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FieldReferenceConverter.IllegalFieldReferenceException May be thrown by the Delegate for badly formatted input.

Method Summary

Modifier and Type	Method and Description
String	convert(String in, com.google.gwt.uibinder.attributeparsers.FieldReferenceConverter.Delegate delegate)
String	convert(XMLElement source, String in, com.google.gwt.uibinder.attributeparsers.FieldReferenceConverter.Delegate delegate)
static int	countFieldReferences(String string) Returns the number of field references in the given string.
static String	expressionToPath(String expression) Reverses most of the work of convert(java.lang.String, com.google.gwt.uibinder.attributeparsers.FieldReferenceConverter.Delegate), turning a java expression back into a dotted path.
static boolean	hasFieldReferences(String string) Returns true if the given string holds one or more field references.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, toString

Method Detail

countFieldReferences

public static int countFieldReferences(String string)

Returns the number of field references in the given string.

expressionToPath

public static String expressionToPath(String expression)

Reverses most of the work of convert(java.lang.String, com.google.gwt.uibinder.attributeparsers.FieldReferenceConverter.Delegate), turning a java expression back into a dotted path.

hasFieldReferences

public static boolean hasFieldReferences(String string)

Returns true if the given string holds one or more field references.

convert

public String convert(String in,
                      com.google.gwt.uibinder.attributeparsers.FieldReferenceConverter.Delegate delegate)

Throws:

FieldReferenceConverter.IllegalFieldReferenceException - if the delegate does

convert

public String convert(XMLElement source,
                      String in,
                      com.google.gwt.uibinder.attributeparsers.FieldReferenceConverter.Delegate delegate)

Throws:

FieldReferenceConverter.IllegalFieldReferenceException - if the delegate does