com.yworks.yfiles.graph

Interface IContextLookupChainLink

All Superinterfaces:

IContextLookup

public interface IContextLookupChainLink
extends IContextLookup

An interface for instances that can be used to chain lookup operations.

Implementations will perform the lookup in the IContextLookup.lookup(Object, Class) method and delegate to the next implementation in the chain if they cannot satisfy the request.

Field Summary

Fields inherited from interface com.yworks.yfiles.graph.IContextLookup

EMPTY_CONTEXT_LOOKUP

Method Summary

Modifier and Type	Method and Description
static IContextLookupChainLink	createAddingLookupChainLink(Class type, Object instance) Factory method for a lookup chain element that simply adds an entry to a lookup chain.
static IContextLookupChainLink	createAddingLookupChainLink(ILookup lookup) Factory method for a lookup chain element that adds an ILookup layer to a lookup chain.
static IContextLookupChainLink	createAddingLookupChainLink(Object instance) Factory method for a lookup chain element that adds an dynamic instance to a lookup chain.
static IContextLookupChainLink	createContextLookupChainLink(IContextLookup callback) Creates a lookup chain link that is backed by the given callback.
static <TContext,TResult> IContextLookupChainLink	createFactoryLookupChainLink(Class<TContext> contextType, Class<TResult> resultType, Function<TContext,TResult> factory) Factory method for a lookup chain element that uses a Function to yield a TResult for a specific TContext.
static IContextLookupChainLink	createHidingLookupChainLink(Class type) Factory method for a lookup chain element that removes the entry from the lookup chain for a given type.
void	setNext(IContextLookup next) This method is called by the framework to register the fallback lookup implementation that should be used during a call to IContextLookup.lookup(Object, Class).

Methods inherited from interface com.yworks.yfiles.graph.IContextLookup

lookup, lookup, lookup, lookup, safeLookup

Method Detail

createAddingLookupChainLink

static IContextLookupChainLink createAddingLookupChainLink(Class type,
                                                           Object instance)

Factory method for a lookup chain element that simply adds an entry to a lookup chain.

Parameters:

type - The type to add to the lookup.

instance - The instance to return if the type is being looked up.

Returns:

An instance that can be used in a lookup chain.

createAddingLookupChainLink

static IContextLookupChainLink createAddingLookupChainLink(ILookup lookup)

Factory method for a lookup chain element that adds an ILookup layer to a lookup chain.

If the lookup returns null, the call will be propagated to the chain.

Parameters:

lookup - The lookup to use.

Returns:

An instance that can be used in a lookup chain.

createAddingLookupChainLink

static IContextLookupChainLink createAddingLookupChainLink(Object instance)

Factory method for a lookup chain element that adds an dynamic instance to a lookup chain.

The instance returned will check whether instance is of the queried type and will then return the instance.

Parameters:

instance - The instance to query the type from dynamically.

Returns:

An instance that can be used in a lookup chain.

createContextLookupChainLink

static IContextLookupChainLink createContextLookupChainLink(IContextLookup callback)

Creates a lookup chain link that is backed by the given callback.

If the callback returns null the request is passed to the chain.

Parameters:

callback - The callback to invoke.

Returns:

The implementation of the link that uses the callback.

createFactoryLookupChainLink

static <TContext,TResult> IContextLookupChainLink createFactoryLookupChainLink(Class<TContext> contextType,
                                                                               Class<TResult> resultType,
                                                                               Function<TContext,TResult> factory)

Factory method for a lookup chain element that uses a Function to yield a TResult for a specific TContext.

If the resulting link is queried for TResult and the context is of type TContext, the factory method will be queried and the result will be returned. Otherwise the next chain link will be delegated the request to.

Parameters:

factory - The factory delegate to use that yields the result for a given context.

Returns:

An instance that can be used in a lookup chain.

createHidingLookupChainLink

static IContextLookupChainLink createHidingLookupChainLink(Class type)

Factory method for a lookup chain element that removes the entry from the lookup chain for a given type.

Parameters:

type - The type to hide from the lookup.

Returns:

An instance that can be used in a lookup chain.

setNext

void setNext(IContextLookup next)

This method is called by the framework to register the fallback lookup implementation that should be used during a call to IContextLookup.lookup(Object, Class).

If the implementation cannot satisfy the query, it will use the provided context as a fallback. Note that implementations can also use the results returned by the next lookup and decorate it appropriately.

Parameters:

next - The context to use as a fallback.