com.stanfy.helium.handler.codegen.tests.JsonEntityExampleGenerator.groovy Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of helium Show documentation

DSL and Java API for REST API specification

There is a newer version: 0.6.0

package com.stanfy.helium.handler.codegen.tests

import com.stanfy.helium.handler.codegen.java.JavaPrimitiveTypes
import com.stanfy.helium.model.Field
import com.stanfy.helium.model.Message
import com.stanfy.helium.model.Sequence
import com.stanfy.helium.model.Type
import com.stanfy.helium.model.TypeResolver
import groovy.json.JsonBuilder
import groovy.transform.PackageScope

/**
 * Generates JSON object based on given type examples.
 * TODO: use entity builder + writer
 */
@PackageScope
class JsonEntityExampleGenerator {

  /** Types resolver. */
  private final TypeResolver typeResolver

  public JsonEntityExampleGenerator(final TypeResolver typeResolver) {
    this.typeResolver = typeResolver
  }

  JsonBuilder generate(final Type type) throws NoExamplesProvidedException {
    JsonBuilder json = new JsonBuilder()
    if (type instanceof Sequence) {
      json([generate(type.itemsType)])
      return json
    }

    if (type instanceof Message) {
      Message msg = (Message) type
      json {
        msg.fields.each { Field field ->
          if (field.type instanceof Sequence || field.type instanceof Message) {

            "$field.name" generate(field.type)

          } else {

            if (!field.examples && field.required) {
              throw new NoExamplesProvidedException(field, "In type $msg")
            }

            if (field.examples) {
              "$field.name" cast(field.examples[0], field.type)
            }

          }

        }
      }
      return json
    }

    throw new UnsupportedOperationException("Cannot generate JSON from $type")
  }

  private def cast(final String example, final Type type) {
    Class groovyClass = JavaPrimitiveTypes.javaClass(type)
    return example.asType(groovyClass)
  }

}