Package io.activej.inject.impl

Class Preprocessor

java.lang.Object

io.activej.inject.impl.Preprocessor

public final class Preprocessor
extends Object

This class contains a set of utils for working with binding graph trie.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	Preprocessor.ErrorHint
static class	Preprocessor.InstanceInjectorImpl<T>
static class	Preprocessor.InstanceProviderImpl<T>
static interface	Preprocessor.MissingKeyHint

Method Summary

Modifier and Type	Method	Description
static void	check(Set<Key<?>> known, Trie<Scope,Map<Key<?>,Binding<?>>> bindings)	A method that checks binding graph trie completeness, meaning that no binding references a key that is not present at same or lower level of the trie, and that there is no cycles in each scope (cycles between scopes are not possible).
static List<Key<?>[]>	collectCycles(Map<Key<?>,Binding<?>> bindings)	This method performs a simple recursive DFS on given binding graph and returns all found cycles.
static Trie<Scope,Map<Key<?>,Binding<?>>>	reduce(Trie<Scope,Map<Key<?>,Set<Binding<?>>>> bindings, Multibinder<?> multibinder, BindingTransformer<?> transformer, BindingGenerator<?> generator)	This method converts a trie of binding multimaps, that is provided from the modules, into a trie of binding maps on which the Injector would actually operate.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

reduce

public static Trie<Scope,Map<Key<?>,Binding<?>>> reduce(Trie<Scope,Map<Key<?>,Set<Binding<?>>>> bindings,
 Multibinder<?> multibinder,
 BindingTransformer<?> transformer,
 BindingGenerator<?> generator)

This method converts a trie of binding multimaps, that is provided from the modules, into a trie of binding maps on which the Injector would actually operate.

While doing so it also recursively tries to generate missing dependency bindings using given generator and apply given BindingTransformer to all of them.

See Also:

• BindingGenerators.combinedGenerator(java.util.Map<io.activej.inject.KeyPattern<?>, java.util.Set<io.activej.inject.binding.BindingGenerator<?>>>)
• BindingTransformers.combinedTransformer(java.util.Map<io.activej.inject.KeyPattern<?>, java.util.Set<io.activej.inject.binding.BindingTransformer<?>>>)

check

public static void check(Set<Key<?>> known,
 Trie<Scope,Map<Key<?>,Binding<?>>> bindings)

A method that checks binding graph trie completeness, meaning that no binding references a key that is not present at same or lower level of the trie, and that there is no cycles in each scope (cycles between scopes are not possible).

It doesn't throw an error if and only if this graph is complete and being complete means that each binding dependencies should have a respective binding in the local or upper scope, and that there is no cyclic dependencies.

collectCycles

public static List<Key<?>[]> collectCycles(Map<Key<?>,Binding<?>> bindings)

This method performs a simple recursive DFS on given binding graph and returns all found cycles.

Unsatisfied dependencies are ignored.