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Swagger

<p>
	The Juneau Swagger DTOs are simply beans with fluent-style setters that allow you to quickly construct 
	Swagger documents as Java objects.  
	These object can then be serialized to JSON using one of the existing JSON serializers, or to other 
	languages such as XML or HTML using the other serializers.
</p>
<p>
	The {@link oaj.dto.swagger.SwaggerBuilder} class is a utility class with predefined static 
	methods that allow you to easily construct DTO instances in a minimal amount of code. 
</p>
<p>
	The following is an example Swagger document from the 
	<a href='http://petstore.swagger.io/'>Swagger website</a>.
</p>
<p class='bpcode w800'>
	{
		<jok>"swagger"</jok>: <jov>"2.0"</jov>,
		<jok>"info"</jok>: {
			<jok>"title"</jok>: <jov>"Swagger Petstore"</jov>,
			<jok>"description"</jok>: <jov>"This is a sample server Petstore server."</jov>,
			<jok>"version"</jok>: <jov>"1.0.0"</jov>,
			<jok>"termsOfService"</jok>: <jov>"http://swagger.io/terms/"</jov>,
			<jok>"contact"</jok>: {
				<jok>"email"</jok>: <jov>"apiteam@swagger.io"</jov>
			},
			<jok>"license"</jok>: {
				<jok>"name"</jok>: <jov>"Apache 2.0"</jov>,
				<jok>"url"</jok>: <jov>"http://www.apache.org/licenses/LICENSE-2.0.html"</jov>
			}
		},
		<jok>"host"</jok>: <jov>"petstore.swagger.io"</jov>,
		<jok>"basePath"</jok>: <jov>"/v2"</jov>,
		<jok>"tags"</jok>: [
			{
				<jok>"name"</jok>: <jov>"pet"</jov>,
				<jok>"description"</jok>: <jov>"Everything about your Pets"</jov>,
				<jok>"externalDocs"</jok>: {
					<jok>"description"</jok>: <jov>"Find out more"</jov>,
					<jok>"url"</jok>: <jov>"http://swagger.io"</jov>
				}
			}
		],
		<jok>"schemes"</jok>: [
			<jov>"http"</jov>
		],
		<jok>"paths"</jok>: {
			<jok>"/pet"</jok>: {
				<jok>"post"</jok>: {
					<jok>"tags"</jok>: [
						<jov>"pet"</jov>
					],
					<jok>"summary"</jok>: <jov>"Add a new pet to the store"</jov>,
					<jok>"description"</jok>: <jov>""</jov>,
					<jok>"operationId"</jok>: <jov>"addPet"</jov>,
					<jok>"consumes"</jok>: [
						<jov>"application/json"</jov>,
						<jov>"text/xml"</jov>
					],
					<jok>"produces"</jok>: [
						<jov>"application/json"</jov>,
						<jov>"text/xml"</jov>
					],
					<jok>"parameters"</jok>: [
						{
							<jok>"in"</jok>: <jov>"body"</jov>,
							<jok>"name"</jok>: <jov>"body"</jov>,
							<jok>"description"</jok>: <jov>"Pet object that needs to be added to the store"</jov>,
							<jok>"required"</jok>: <jov>true</jov>
						}
					],
					<jok>"responses"</jok>: {
						<jok>"405"</jok>: {
							<jok>"description"</jok>: <jov>"Invalid input"</jov>
						}
					}
				}
			}
		}
	}		
</p>
<p>
	This document can be generated by the following Java code:
</p>
<p class='bpcode w800'>
	<jk>static import</jk> org.apache.juneau.dto.swagger.SwaggerBuilder.*;

	Swagger swagger = <jsm>swagger</jsm>()
		.swagger(<js>"2.0"</js>)
		.info(
			<jsm>info</jsm>(<js>"Swagger Petstore"</js>, <js>"1.0.0"</js>)
				.description(<js>"This is a sample server Petstore server."</js>)
				.termsOfService(<js>"http://swagger.io/terms/"</js>)
				.contact(
					<jsm>contact</jsm>().email(<js>"apiteam@swagger.io"</js>)
				)
				.license(
					<jsm>license</jsm>(<js>"Apache 2.0"</js>).url(<js>"http://www.apache.org/licenses/LICENSE-2.0.html"</js>)
				)
		)
		.host(<js>"petstore.swagger.io"</js>)
		.basePath(<js>"/v2"</js>)
		.tags(
			<jsm>tag</jsm>(<js>"pet"</js>).description(<js>"Everything about your Pets"</js>)
				.externalDocs(
					<jsm>externalDocumentation</jsm>(<js>"http://swagger.io"</js>, <js>"http://swagger.io"</js>)
				)
		)
		.schemes(<js>"http"</js>)
		.path(<js>"/pet"</js>, <js>"post"</js>,
			<jsm>operation</jsm>()
				.tags(<js>"pet"</js>)
				.summary(<js>"Add a new pet to the store"</js>)
				.description(<js>""</js>)
				.operationId(<js>"addPet"</js>)
				.consumes(MediaType.<jsf>JSON</jsf>, MediaType.<jsf>XML</jsf>)
				.produces(MediaType.<jsf>JSON</jsf>, MediaType.<jsf>XML</jsf>)
				.parameters(
					<jsm>parameterInfo</jsm>(<js>"body"</js>, <js>"body"</js>)
						.description(<js>"Pet object that needs to be added to the store"</js>)
						.required(<jk>true</jk>)
				)
				.response(405, <jsm>responseInfo</jsm>(<js>"Invalid input"</js>))
		);

	<jc>// Serialize using JSON serializer.</jc>
	String swaggerJson = JsonSerializer.<jsf>DEFAULT_READABLE</jsf>.serialize(swagger);
	
	<jc>// Or just use toString().</jc>
	String swaggerJson = swagger.toString();
</p>
<p>
	Methods that take in beans and collections of beans can also take in JSON representations
	of those objects.
</p>
<p class='bpcode w800'>
	<jc>// Pass in a JSON object representation of an Info object.</jc>
	swagger.info(<js>"{title:'Swagger Petstore',...}"</js>);
</p>
<p>
	Properties can also be accessed via the {@link oaj.dto.swagger.SwaggerElement#get(String,Class)}
	and {@link oaj.dto.swagger.SwaggerElement#set(String,Object)} methods.
	These methods can also be used to set and retrieve non-Swagger attributes such as 
	<js>"$ref"</js> (which is not a part of the Swagger spec, but is part of the JSON Schema spec).
</p>
<p class='bpcode w800'>
	<jc>// Set a non-standard attribute.</jc>
	swagger.set(<js>"$ref"</js>, <js>"http://foo.com"</js>);
	
	<jc>// Retrieve a non-standard attribute.</jc>
	URI ref = swagger.get(<js>"$ref"</js>, URI.<jk>class</jk>);
</p>
<p>
	Swagger docs can be parsed back into Swagger beans using the following code:
</p>
<p class='bpcode w800'>
	Swagger swagger = JsonParser.<jsf>DEFAULT</jsf>.parse(swaggerJson, Swagger.<jk>class</jk>);
</p>