org.directwebremoting.extend
Interface ConverterManager

All Known Implementing Classes:

DefaultConverterManager, InternalConverterManager

public interface ConverterManager

A class to manage the converter types and the instantiated class name matches.

Author:

Joe Walker [joe at getahead dot ltd dot uk]

Method Summary

void	addConverter(java.lang.Class<?> clazz, Converter converter) Add a new converter based on a loaded class.
void	addConverter(java.lang.String match, Converter converter) Add a new converter based on a match string
void	addConverter(java.lang.String match, java.lang.String type, java.util.Map<java.lang.String,java.lang.String> params) Add a new converter based on a match string
void	addConverterType(java.lang.String id, java.lang.String className) Add a new converter type
Property	checkOverride(Property property) All Propertys can create children to represent sub-types, but the ConverterManager might want to override the options that they provide using types configured by a signatures element.
<T> T	convertInbound(java.lang.Class<T> paramType, InboundVariable data, Property thc) Convert an object from being a string into an object of some type.
<T> T	convertInbound(java.lang.Class<T> paramType, RawData rawData) RawData is something of a special case for conversion - it's designed to be converted outside of the normal automatic conversion process when the type can't be known until later.
OutboundVariable	convertOutbound(java.lang.Object data, OutboundContext converted) Convert an object into a Javascript representation of the same.
java.lang.Class<?>	getClientDeclaredType(InboundVariable data) Sometimes data from clients contains type information which should take higher priority than the type guessing that we do as part of the method matching.
Converter	getConverterByMatchString(java.lang.String match) In order to be able to create stub remote objects we need to know what they are so you can lookup match strings and retrieve the converter.
java.util.Collection<java.lang.String>	getConverterMatchStrings() In order to be able to create stub remote objects we need to know what they are so you can get a collection of all match strings.
NamedConverter	getNamedConverter(java.lang.String javascriptClassName) Find a converter based on class-mapped JavaScript class name.
java.util.Collection<java.lang.String>	getNamedConverterJavaScriptNames() Returns a collection with all the named converters' JavaScript class names.
boolean	isConvertable(java.lang.Class<?> paramType) Check if we can coerce the given type
void	setConverters(java.util.Map<java.lang.String,Converter> converters) Sets the converters for this converter manager.
void	setOverrideProperty(Property original, Property replacement) We don't know enough from a method signature like setUsers(Set s) to be able to cast the inbound data to a set of Users.

Method Detail

addConverterType

void addConverterType(java.lang.String id,
                      java.lang.String className)

Add a new converter type

Parameters:

id - The name of the converter type

className - The class to do the conversion

addConverter

void addConverter(java.lang.String match,
                  java.lang.String type,
                  java.util.Map<java.lang.String,java.lang.String> params)
                  throws java.lang.IllegalArgumentException,
                         java.lang.InstantiationException,
                         java.lang.IllegalAccessException

Add a new converter based on a match string

Parameters:

match - The class name(s) to match

type - The name of the converter type

params - The extra parameters to allow the creator to configure itself

Throws:

java.lang.InstantiationException - If reflection based creation fails

java.lang.IllegalAccessException - If reflection based creation fails

java.lang.IllegalArgumentException - If we have a duplicate name

addConverter

void addConverter(java.lang.String match,
                  Converter converter)
                  throws java.lang.IllegalArgumentException

Add a new converter based on a match string

Parameters:

match - The class name(s) to match

converter - The converter to add

Throws:

java.lang.IllegalArgumentException - If we have a duplicate name

addConverter

void addConverter(java.lang.Class<?> clazz,
                  Converter converter)

Add a new converter based on a loaded class. DWR will not make any decisions based on the class's name, which allows for multiple registrations for the same class name (f ex needed in OSGI).

Parameters:

clazz - The class to match

converter - The converter to add

getConverterMatchStrings

java.util.Collection<java.lang.String> getConverterMatchStrings()

In order to be able to create stub remote objects we need to know what they are so you can get a collection of all match strings.

Returns:

A Collection of all the converter match strings

See Also:

getConverterByMatchString(String)

getConverterByMatchString

Converter getConverterByMatchString(java.lang.String match)

In order to be able to create stub remote objects we need to know what they are so you can lookup match strings and retrieve the converter.

Parameters:

match - The match string to lookup

Returns:

The matching converter

See Also:

getConverterMatchStrings()

getNamedConverterJavaScriptNames

java.util.Collection<java.lang.String> getNamedConverterJavaScriptNames()

Returns a collection with all the named converters' JavaScript class names.

Returns:

A Collection of name strings

getNamedConverter

NamedConverter getNamedConverter(java.lang.String javascriptClassName)

Find a converter based on class-mapped JavaScript class name.

Parameters:

javascriptClassName - The type name as passed in from the client

Returns:

The Converter that matches this request (if any)

isConvertable

boolean isConvertable(java.lang.Class<?> paramType)

Check if we can coerce the given type

Parameters:

paramType - The type to check

Returns:

true iff paramType is convertible

getClientDeclaredType

java.lang.Class<?> getClientDeclaredType(InboundVariable data)

Sometimes data from clients contains type information which should take higher priority than the type guessing that we do as part of the method matching. This method extracts the client passed type information.

Parameters:

data - The string version of the object from the client

Returns:

Any type information specified by the client

convertInbound

<T> T convertInbound(java.lang.Class<T> paramType,
                     InboundVariable data,
                     Property thc)
                 throws ConversionException

Convert an object from being a string into an object of some type. Designed for use with converters that have a working map passed to them

Parameters:

paramType - The type that you want the object to be

data - The string version of the object

Returns:

The convertible object

Throws:

ConversionException - If the conversion failed for some reason

convertInbound

<T> T convertInbound(java.lang.Class<T> paramType,
                     RawData rawData)
                 throws ConversionException

RawData is something of a special case for conversion - it's designed to be converted outside of the normal automatic conversion process when the type can't be known until later. This method helps us with those cases without exposing too much of what RawData holds.

Type Parameters:

T -

Parameters:

paramType - The type we wish to convert to

rawData - The RawData object holding data to be converted

Returns:

The convertible object

Throws:

ConversionException - If the conversion failed for some reason

convertOutbound

OutboundVariable convertOutbound(java.lang.Object data,
                                 OutboundContext converted)
                                 throws ConversionException

Convert an object into a Javascript representation of the same. This method is for use by converters wishing to recurse into some object.

Parameters:

data - The object to convert

converted - The list of converted objects so far

Returns:

A Javascript string version of the object

Throws:

ConversionException - If the conversion failed for some reason

setOverrideProperty

void setOverrideProperty(Property original,
                         Property replacement)

We don't know enough from a method signature like setUsers(Set s) to be able to cast the inbound data to a set of Users. This method enables us to specify this extra information.

Parameters:

original - The original property that might need replacing

replacement - A replacement property that returns the correct type

checkOverride

Property checkOverride(Property property)

All Propertys can create children to represent sub-types, but the ConverterManager might want to override the options that they provide using types configured by a signatures element.

Parameters:

property - The property to check for overriding

Returns:

The original property unless an override was provided

setConverters

void setConverters(java.util.Map<java.lang.String,Converter> converters)

Sets the converters for this converter manager.

Parameters:

converters - the map of match pattern and their converter instances