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// GenerateDockerfileContents return function docker file
func (b *Builder) GenerateDockerfileContents(baseImage string,
	onbuildArtifacts []runtime.Artifact,
	imageArtifactPaths map[string]string,
	directives map[string][]functionconfig.Directive,
	healthCheckRequired bool) (string, error) {

	// now that all artifacts are in the artifacts directory, we can craft a Dockerfile
	dockerfileTemplateContents := `# Multistage builds

{{ range $onbuildStage := .OnbuildStages }}
{{ $onbuildStage }}
{{ end }}

# From the base image
FROM {{ .BaseImage }}

# Old(er) Docker support - must use all build args
ARG NUCLIO_LABEL
ARG NUCLIO_ARCH
ARG NUCLIO_BUILD_LOCAL_HANDLER_DIR

{{ if .PreCopyDirectives }}
# Run the pre-copy directives
{{ range $directive := .PreCopyDirectives }}
{{ $directive.Kind }} {{ $directive.Value }}
{{ end }}
{{ end }}

# Copy required objects from the suppliers
{{ range $localArtifactPath, $imageArtifactPath := .OnbuildArtifactPaths }}
COPY {{ $localArtifactPath }} {{ $imageArtifactPath }}
{{ end }}

{{ range $localArtifactPath, $imageArtifactPath := .ImageArtifactPaths }}
COPY {{ $localArtifactPath }} {{ $imageArtifactPath }}
{{ end }}

{{ if .HealthcheckRequired }}
# Readiness probe
HEALTHCHECK --interval=1s --timeout=3s CMD /usr/local/bin/uhttpc --url http://127.0.0.1:8082/ready || exit 1
{{ end }}

# Run the post-copy directives
{{ range $directive := .PostCopyDirectives }}
{{ $directive.Kind }} {{ $directive.Value }}
{{ end }}

# Run processor with configuration and platform configuration
CMD [ "processor" ]
`

	onbuildStages, err := b.platform.GetOnbuildStages(onbuildArtifacts)
	if err != nil {
		return "", errors.Wrap(err, "Failed to transform retrieve onbuild stages")
	}

	// Transform `onbuildArtifactPaths` depending on the builder being used
	onbuildArtifactPaths, err := b.platform.TransformOnbuildArtifactPaths(onbuildArtifacts)
	if err != nil {
		return "", errors.Wrap(err, "Failed to transform onbuildArtifactPaths")
	}

	dockerfileTemplate, err := template.New("singleStageDockerfile").
		Parse(dockerfileTemplateContents)
	if err != nil {
		return "", errors.Wrap(err, "Failed to create onbuildImage template")
	}

	var dockerfileTemplateBuffer bytes.Buffer
	err = dockerfileTemplate.Execute(&dockerfileTemplateBuffer, &map[string]interface{}{
		"BaseImage":            baseImage,
		"OnbuildStages":        onbuildStages,
		"OnbuildArtifactPaths": onbuildArtifactPaths,
		"ImageArtifactPaths":   imageArtifactPaths,
		"PreCopyDirectives":    directives["preCopy"],
		"PostCopyDirectives":   directives["postCopy"],
		"HealthcheckRequired":  healthCheckRequired,
	})

	if err != nil {
		return "", errors.Wrap(err, "Failed to run template")
	}

	dockerfileContents := dockerfileTemplateBuffer.String()

	return dockerfileContents, nil
}

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pkg/platform
├── abstract
│   ├── platform.go
├── config
│   └── types.go
├── errors.go
├── factory
│   └── factory.go
├── kube
│   ├── platform.go
│   ├── types.go
├── local
│   ├── platform.go
│   └── types.go
├── platform.go
└── types.go

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func (j *java) GetProcessorDockerfileInfo(onbuildImageRegistry string) (*runtime.ProcessorDockerfileInfo, error) {

	processorDockerfileInfo := runtime.ProcessorDockerfileInfo{}
	processorDockerfileInfo.BaseImage = "openjdk:9-jre-slim"

	// fill onbuild artifact
	artifact := runtime.Artifact{
		Name: "java-onbuild",
		Image: fmt.Sprintf("%s/nuclio/handler-builder-java-onbuild:%s-%s",
			onbuildImageRegistry,
			j.VersionInfo.Label,
			j.VersionInfo.Arch),
		Paths: map[string]string{
			"/home/gradle/bin/processor":                                  "/usr/local/bin/processor",
			"/home/gradle/src/wrapper/build/libs/nuclio-java-wrapper.jar": "/opt/nuclio/nuclio-java-wrapper.jar",
		},
	}
	processorDockerfileInfo.OnbuildArtifacts = []runtime.Artifact{artifact}

	return &processorDockerfileInfo, nil
}