mirror of
https://github.com/ent/ent.git
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126 lines
3.6 KiB
Go
126 lines
3.6 KiB
Go
// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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// This source code is licensed under the Apache 2.0 license found
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// in the LICENSE file in the root directory of this source tree.
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// Code generated by entc, DO NOT EDIT.
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package hook
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import (
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"context"
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"fmt"
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"github.com/facebookincubator/ent/examples/traversal/ent"
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)
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// The GroupFunc type is an adapter to allow the use of ordinary
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// function as Group mutator.
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type GroupFunc func(context.Context, *ent.GroupMutation) (ent.Value, error)
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// Mutate calls f(ctx, m).
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func (f GroupFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
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mv, ok := m.(*ent.GroupMutation)
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if !ok {
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return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.GroupMutation", m)
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}
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return f(ctx, mv)
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}
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// The PetFunc type is an adapter to allow the use of ordinary
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// function as Pet mutator.
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type PetFunc func(context.Context, *ent.PetMutation) (ent.Value, error)
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// Mutate calls f(ctx, m).
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func (f PetFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
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mv, ok := m.(*ent.PetMutation)
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if !ok {
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return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.PetMutation", m)
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}
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return f(ctx, mv)
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}
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// The UserFunc type is an adapter to allow the use of ordinary
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// function as User mutator.
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type UserFunc func(context.Context, *ent.UserMutation) (ent.Value, error)
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// Mutate calls f(ctx, m).
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func (f UserFunc) Mutate(ctx context.Context, m ent.Mutation) (ent.Value, error) {
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mv, ok := m.(*ent.UserMutation)
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if !ok {
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return nil, fmt.Errorf("unexpected mutation type %T. expect *ent.UserMutation", m)
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}
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return f(ctx, mv)
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}
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// On executes the given hook only of the given operation.
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//
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// hook.On(Log, ent.Delete|ent.Create)
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//
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func On(hk ent.Hook, op ent.Op) ent.Hook {
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return func(next ent.Mutator) ent.Mutator {
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return ent.MutateFunc(func(ctx context.Context, m ent.Mutation) (ent.Value, error) {
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if m.Op().Is(op) {
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return hk(next).Mutate(ctx, m)
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}
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return next.Mutate(ctx, m)
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})
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}
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}
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// Reject returns a hook that rejects all operations that match op.
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//
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// func (T) Hooks() []ent.Hook {
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// return []ent.Hook{
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// Reject(ent.Delete|ent.Update),
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// }
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// }
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//
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func Reject(op ent.Op) ent.Hook {
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return func(next ent.Mutator) ent.Mutator {
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return ent.MutateFunc(func(ctx context.Context, m ent.Mutation) (ent.Value, error) {
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if m.Op().Is(op) {
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return nil, fmt.Errorf("%s operation is not allowed", m.Op())
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}
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return next.Mutate(ctx, m)
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})
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}
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}
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// Chain acts as a list of hooks and is effectively immutable.
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// Once created, it will always hold the same set of hooks in the same order.
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type Chain struct {
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hooks []ent.Hook
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}
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// NewChain creates a new chain of hooks.
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func NewChain(hooks ...ent.Hook) Chain {
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return Chain{append([]ent.Hook(nil), hooks...)}
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}
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// Hook chains the list of hooks and returns the final hook.
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func (c Chain) Hook() ent.Hook {
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return func(next ent.Mutator) ent.Mutator {
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for i := len(c.hooks) - 1; i >= 0; i-- {
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next = c.hooks[i](next)
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}
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return ent.MutateFunc(func(ctx context.Context, m ent.Mutation) (ent.Value, error) {
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return next.Mutate(ctx, m)
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})
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}
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}
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// Append extends a chain, adding the specified hook
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// as the last ones in the mutation flow.
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func (c Chain) Append(hooks ...ent.Hook) Chain {
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newHooks := make([]ent.Hook, 0, len(c.hooks)+len(hooks))
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newHooks = append(newHooks, c.hooks...)
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newHooks = append(newHooks, hooks...)
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return Chain{newHooks}
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}
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// Extend extends a chain, adding the specified chain
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// as the last ones in the mutation flow.
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func (c Chain) Extend(chain Chain) Chain {
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return c.Append(chain.hooks...)
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}
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