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DataKernel has an extremely lightweight DI with ground-breaking design principles. It supports nested scopes, singletons, object factories, modules and plugins which allow to transform graph of dependencies at startup time without any reflection.

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package io.datakernel.di.core;

import io.datakernel.di.module.ModuleBuilderBinder;

import java.util.HashSet;
import java.util.Set;

/**
 * This class represents a set of bindings for the same key.
 * It also contains the {@link BindingType} - it is mostly used for plain binds with extra calls,
 * such as {@link ModuleBuilderBinder#asTransient transient} or {@link ModuleBuilderBinder#asEager eager}.
 * 
 * Note that one of the bindings itself may still be transient while the type of the set is {@link BindingType#COMMON COMMON},
 * this case should be handled properly (e.g. {@link Multibinder#toSet toSet()} multibinder is transient if at least one of its peers is transient).
 */
public final class BindingSet {
	private final Set> bindings;
	private BindingType type;

	public BindingSet(Set> bindings, BindingType type) {
		this.bindings = bindings;
		this.type = type;
	}

	public Set> getBindings() {
		return bindings;
	}

	public BindingType getType() {
		return type;
	}

	public void setType(BindingType type) {
		this.type = type;
	}

	@SuppressWarnings("unchecked")
	public static BindingSet merge(Key key, BindingSet first, BindingSet second) {
		if (first.type != second.type) {
			throw new DIException("Two binding sets bound with different types for key " + key.getDisplayString());
		}
		Set> set = new HashSet<>();
		set.addAll(first.bindings);
		set.addAll(second.bindings);
		return new BindingSet(set, first.type);
	}
}