text: /*
   * Copyright 2020 The Knative Authors
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package v1beta1
  
  import (
  	"context"
  
  	"knative.dev/pkg/apis"
  )
  
  func (p *Sequence) Validate(ctx context.Context) *apis.FieldError {
  	return p.Spec.Validate(ctx).ViaField("spec")
  }
  
  func (ps *SequenceSpec) Validate(ctx context.Context) *apis.FieldError {
  	var errs *apis.FieldError
  
  	if len(ps.Steps) == 0 {
  		errs = errs.Also(apis.ErrMissingField("steps"))
  	}
  
  	for i, s := range ps.Steps {
  		if e := s.Validate(ctx); e != nil {
  			errs = errs.Also(apis.ErrInvalidArrayValue(s, "steps", i))
  		}
  	}
  
  	if ps.ChannelTemplate == nil {
  		errs = errs.Also(apis.ErrMissingField("channelTemplate"))
  		return errs
  	}
  
  	if len(ps.ChannelTemplate.APIVersion) == 0 {
  		errs = errs.Also(apis.ErrMissingField("channelTemplate.apiVersion"))
  	}
  
  	if len(ps.ChannelTemplate.Kind) == 0 {
  		errs = errs.Also(apis.ErrMissingField("channelTemplate.kind"))
  	}
  
  	if err := ps.Reply.Validate(ctx); err != nil {
  		errs = errs.Also(err.ViaField("reply"))
  	}
  
  	return errs
  }
  
  func (ss *SequenceStep) Validate(ctx context.Context) *apis.FieldError {
  	errs := ss.Destination.Validate(ctx)
  
  	if ss.Delivery != nil {
  		if de := ss.Delivery.Validate(ctx); de != nil {
  			errs = errs.Also(de.ViaField("delivery"))
  		}
  	}
  
  	return errs
  }
  