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• DIAware.kt

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commonMain.org.kodein.di.DIAware.kt Maven / Gradle / Ivy

@file:Suppress("FunctionName")

package org.kodein.di

import org.kodein.di.internal.DirectDIImpl
import org.kodein.type.TypeToken

/**
 * Defines a context and its type to be used by Di
 */
public interface DIContext {
        /**
         * The type of the context, used to lookup corresponding bindings.
         */
        public val type: TypeToken

        /**
         * The context itself.
         */
        public val value: C

    /**
     * Defines a context and its type to be used by DI
     */
    public data class Value(override val type: TypeToken, override val value: C) : DIContext

    /**
     * Defines a context and its type to be used by DI
     */
    public class Lazy(override val type: TypeToken, public val getValue: () -> C) : DIContext {
        override val value: C by lazy(getValue)
    }

    public companion object {
        public operator fun  invoke(type: TypeToken, value: C): DIContext = Value(type, value)
        public operator fun  invoke(type: TypeToken, getValue: () -> C): DIContext = Lazy(type, getValue)
    }
}



@Suppress("UNCHECKED_CAST")
internal inline val DIContext<*>.anyType get() = type as TypeToken

private object Contexes {
    val AnyDIContext = DIContext(TypeToken.Any, Any())
}

/**
 * Default DI context, means no context.
 */
internal val AnyDIContext: DIContext get() = Contexes.AnyDIContext

/**
 * Any class that extends this interface can use DI "seamlessly".
 */
public interface DIAware {

    /**
     * A DI Aware class must be within reach of a [DI] object.
     */
    public val di: DI

    /**
     * A DI Aware class can define a context that is for all retrieval by overriding this property.
     *
     * Note that even if you override this property, all bindings that do not use a Context or are not scoped will still work!
     */
    public val diContext: DIContext<*> get() = AnyDIContext

    /**
     * Trigger to use that define when the retrieval will be done.
     *
     * By default, retrieval happens on first property access.
     * However, you can use a [DITrigger] to force retrieval at a given time of your choice.
     */
    public val diTrigger: DITrigger? get() = null
}

/**
 * Gets a factory of [T] for the given argument type, return type and tag.
 *
 * @param A The type of argument the returned factory takes.
 * @param T The type of object to retrieve with the returned factory.
 * @param argType The type of argument the returned factory takes.
 * @param type The type of object to retrieve with the returned factory.
 * @param tag The bound tag, if any.
 * @return A factory of [T].
 * @throws DI.NotFoundException If no factory was found.
 * @throws DI.DependencyLoopException When calling the factory, if the value construction triggered a dependency loop.
 */
public fun  DIAware.Factory(argType: TypeToken, type: TypeToken, tag: Any? = null): DIProperty<(A) -> T> =
        DIProperty(diTrigger, diContext) { ctx, _ -> di.container.factory(DI.Key(ctx.anyType, argType, type, tag), ctx.value) }

/**
 * Gets a factory of [T] for the given argument type, return type and tag, or null if none is found.
 *
 * @param A The type of argument the returned factory takes.
 * @param T The type of object to retrieve with the returned factory.
 * @param argType The type of argument the returned factory takes.
 * @param type The type of object to retrieve with the returned factory.
 * @param tag The bound tag, if any.
 * @return A factory of [T], or null if no factory was found.
 * @throws DI.DependencyLoopException When calling the factory, if the value construction triggered a dependency loop.
 */
public fun  DIAware.FactoryOrNull(argType: TypeToken, type: TypeToken, tag: Any? = null): DIProperty<((A) -> T)?> =
        DIProperty(diTrigger, diContext) { ctx, _ -> di.container.factoryOrNull(DI.Key(ctx.anyType, argType, type, tag), ctx.value) }

/**
 * Gets a provider of [T] for the given type and tag.
 *
 * @param T The type of object to retrieve with the returned provider.
 * @param type The type of object to retrieve with the returned provider.
 * @param tag The bound tag, if any.
 * @return A provider of [T].
 * @throws DI.NotFoundException If no provider was found.
 * @throws DI.DependencyLoopException When calling the provider, if the value construction triggered a dependency loop.
 */
public fun  DIAware.Provider(type: TypeToken, tag: Any? = null): DIProperty<() -> T> =
        DIProperty(diTrigger, diContext) { ctx, _ -> di.container.provider(DI.Key(ctx.anyType, TypeToken.Unit, type, tag), ctx.value) }

/**
 * Gets a provider of [T] for the given type and tag, curried from a factory that takes an argument [A].
 *
 * @param A The type of argument the curried factory takes.
 * @param T The type of object to retrieve with the returned provider.
 * @param argType The type of argument the curried factory takes.
 * @param type The type of object to retrieve with the returned provider.
 * @param tag The bound tag, if any.
 * @param arg A function that returns the argument that will be given to the factory when curried.
 * @return A provider of [T].
 * @throws DI.NotFoundException If no provider was found.
 * @throws DI.DependencyLoopException When calling the provider, if the value construction triggered a dependency loop.
 */
public fun  DIAware.Provider(argType: TypeToken, type: TypeToken, tag: Any? = null, arg: () -> A): DIProperty<() -> T> =
        DIProperty(diTrigger, diContext) { ctx, _ -> di.container.factory(DI.Key(ctx.anyType, argType, type, tag), ctx.value).toProvider(arg) }

/**
 * Gets a provider of [T] for the given type and tag, or null if none is found.
 *
 * @param T The type of object to retrieve with the returned provider.
 * @param type The type of object to retrieve with the returned provider.
 * @param tag The bound tag, if any.
 * @return A provider of [T], or null if no provider was found.
 * @throws DI.DependencyLoopException When calling the provider, if the value construction triggered a dependency loop.
 */
public fun  DIAware.ProviderOrNull(type: TypeToken, tag: Any? = null): DIProperty<(() -> T)?> =
        DIProperty(diTrigger, diContext) { ctx, _ -> di.container.providerOrNull(DI.Key(ctx.anyType, TypeToken.Unit, type, tag), ctx.value) }

/**
 * Gets a provider of [T] for the given type and tag, curried from a factory that takes an argument [A], or null if none is found.
 *
 * @param A The type of argument the curried factory takes.
 * @param T The type of object to retrieve with the returned provider.
 * @param argType The type of argument the curried factory takes.
 * @param type The type of object to retrieve with the returned provider.
 * @param tag The bound tag, if any.
 * @param arg A function that returns the argument that will be given to the factory when curried.
 * @return A provider of [T], or null if no factory was found.
 * @throws DI.DependencyLoopException When calling the provider, if the value construction triggered a dependency loop.
 */
public fun  DIAware.ProviderOrNull(argType: TypeToken, type: TypeToken, tag: Any? = null, arg: () -> A): DIProperty<(() -> T)?> =
        DIProperty(diTrigger, diContext) { ctx, _ -> di.container.factoryOrNull(DI.Key(ctx.anyType, argType, type, tag), ctx.value)?.toProvider(arg) }

/**
 * Gets an instance of [T] for the given type and tag.
 *
 * @param T The type of object to retrieve.
 * @param type The type of object to retrieve.
 * @param tag The bound tag, if any.
 * @return An instance of [T].
 * @throws DI.NotFoundException If no provider was found.
 * @throws DI.DependencyLoopException If the value construction triggered a dependency loop.
 */
public fun  DIAware.Instance(type: TypeToken, tag: Any? = null): DIProperty =
        DIProperty(diTrigger, diContext) { ctx, _ -> di.container.provider(DI.Key(ctx.anyType, TypeToken.Unit, type, tag), ctx.value).invoke() }

/**
 * Gets an instance of [T] for the given type and tag, curried from a factory that takes an argument [A].
 *
 * @param A The type of argument the curried factory takes.
 * @param T The type of object to retrieve.
 * @param argType The type of argument the curried factory takes.
 * @param type The type of object to retrieve.
 * @param tag The bound tag, if any.
 * @param arg A function that returns the argument that will be given to the factory when curried.
 * @return An instance of [T].
 * @throws DI.NotFoundException If no provider was found.
 * @throws DI.DependencyLoopException If the value construction triggered a dependency loop.
 */
public fun  DIAware.Instance(argType: TypeToken, type: TypeToken, tag: Any? = null, arg: () -> A): DIProperty =
        DIProperty(diTrigger, diContext) { ctx, _ -> di.container.factory(DI.Key(ctx.anyType, argType, type, tag), ctx.value).invoke(arg()) }

/**
 * Gets an instance of [T] for the given type and tag, or null if none is found.
 *
 * @param type The type of object to retrieve.
 * @param tag The bound tag, if any.
 * @return An instance of [T], or null if no provider was found.
 * @throws DI.DependencyLoopException If the value construction triggered a dependency loop.
 */
public fun  DIAware.InstanceOrNull(type: TypeToken, tag: Any? = null): DIProperty =
        DIProperty(diTrigger, diContext) { ctx, _ -> di.container.providerOrNull(DI.Key(ctx.anyType, TypeToken.Unit, type, tag), ctx.value)?.invoke() }

/**
 * Gets an instance of [T] for the given type and tag, curried from a factory that takes an argument [A], or null if none is found.
 *
 * @param A The type of argument the curried factory takes.
 * @param T The type of object to retrieve.
 * @param type The type of object to retrieve.
 * @param tag The bound tag, if any.
 * @param arg A function that returns the argument that will be given to the factory when curried.
 * @return An instance of [T], or null if no factory was found.
 * @throws DI.DependencyLoopException If the value construction triggered a dependency loop.
 */
public fun  DIAware.InstanceOrNull(argType: TypeToken, type: TypeToken, tag: Any? = null, arg: () -> A): DIProperty =
        DIProperty(diTrigger, diContext) { ctx, _ -> di.container.factoryOrNull(DI.Key(ctx.anyType, argType, type, tag), ctx.value)?.invoke(arg()) }

/**
 * Return a direct [DirectDI] instance, with its receiver and context set to this DIAware receiver and context.
 */
public val DIAware.direct: DirectDI get() = DirectDIImpl(di.container, diContext)

private class DIWrapper(
        private val _base: DI,
        override val diContext: DIContext<*>,
        override val diTrigger: DITrigger? = null
) : DI {
    internal constructor(base: DIAware, diContext: DIContext<*> = base.diContext, trigger: DITrigger? = base.diTrigger) : this(base.di, diContext, trigger)

    override val di: DI get() = this

    override val container: DIContainer get() = _base.container
}

/**
 * Allows to create a new DI object with a context and/or a trigger set.
 *
 * @param context The new context of the new DI.
 * @param trigger The new trigger of the new DI.
 * @return A DI object that uses the same container as this one, but with its context and/or trigger changed.
 */
public fun DIAware.On(context: DIContext<*> = this.diContext, trigger: DITrigger? = this.diTrigger): DI = DIWrapper(this, diContext = context, trigger = trigger)

/**
 * Allows to create a new instance of an unbound object with the same API as when bounding one.
 *
 * @param T The type of object to create.
 * @param creator A function that do create the object.
 */
public fun  DIAware.newInstance(creator: DirectDI.() -> T): DIProperty = DIProperty(diTrigger, diContext) { ctx, _ -> di.direct.On(ctx).run(creator) }