com.github.thorbenkuck.di.domain.provider.SingletonGenericIdentifiableProvider Maven / Gradle / Ivy

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package com.github.thorbenkuck.di.domain.provider;

import com.github.thorbenkuck.di.runtime.WireRepository;
import org.jetbrains.annotations.NotNull;

import java.util.function.Function;

class SingletonGenericIdentifiableProvider implements IdentifiableProvider {

	@NotNull
	private final Function creationFunction;
	@NotNull
	private final Class[] wireTypes;
	@NotNull
	private final Class type;
	private volatile T instance;

	SingletonGenericIdentifiableProvider(
			@NotNull final Function creationFunction,
			@NotNull Class[] wireTypes,
			@NotNull Class type
	) {
		this.creationFunction = creationFunction;
		this.type = type;
		this.wireTypes = wireTypes;
	}

	@Override
	@NotNull
	public final Class type() {
		return type;
	}

	@Override
	@NotNull
	public final Class[] wiredTypes() {
		return wireTypes;
	}

	@Override
	public final boolean isSingleton() {
		return true;
	}

	@Override
	@NotNull
	public synchronized T get(@NotNull final WireRepository wiredRepository) {
		if(instance == null) {
			instance = creationFunction.apply(wiredRepository);
		}

		return instance;
	}
}