jsondiscoverer.web

Class JsonSimpleDiscovererServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

jsondiscoverer.web.AbstractJsonDiscoverer

jsondiscoverer.web.JsonSimpleDiscovererServlet

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

@WebServlet(value="/simpleDiscoverMetamodel")
public class JsonSimpleDiscovererServlet
extends AbstractJsonDiscoverer

Servlet providing providing access to JsonSimpleDiscoverer.

The servlet answers to POST HTTP calls. Receives as input a JSON document from which a metamodel is discovered. The discovered metamodel is returned as both image and xmi, both of them encoded as base64.

Author:

Javier Canovas (me@jlcanovas.es)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private static java.lang.String	folderName Name of the folder where the temp files will be stored
private static long	serialVersionUID
static java.lang.String	SIMPLEDISCOVERER_FOLDER The ID for this servlet which will be used to access to the working directory

Fields inherited from class jsondiscoverer.web.AbstractJsonDiscoverer

dotExePath, jsonParam, properties, serverURL, version, workingDir

Constructor Summary

Constructors

Constructor and Description
JsonSimpleDiscovererServlet()

Method Summary

Modifier and Type	Method and Description
private java.io.File	convertToImage(org.eclipse.emf.ecore.EPackage ePackage) Converts a EPackage into a picture and saves it in disk.
private org.eclipse.emf.ecore.EPackage	discoverMetamodel(java.lang.String jsonCode) Discover a metamodel from a JSON document.
private java.lang.String	discoverMetamodelBase64(org.eclipse.emf.ecore.EPackage ePackage) Performs the discovery and returns a picture encoded in BASE64 with the picture representing the discovered metamodel The method relies on convertToImage(EPackage) and AbstractJsonDiscoverer.encodeToString(File)
protected void	doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) Performs a POST call to this servlet.
void	init() Uses the super class init method and additionally initializes folderName

Methods inherited from class jsondiscoverer.web.AbstractJsonDiscoverer

addResponseOptions, digestExceptionMessage, doOptions, drawModel, drawModel, drawObjectModel, encodeToString, encodeToString, encodeToString

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doGet, doHead, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

SIMPLEDISCOVERER_FOLDER

public static final java.lang.String SIMPLEDISCOVERER_FOLDER

The ID for this servlet which will be used to access to the working directory

See Also:

Constant Field Values

folderName

private static java.lang.String folderName

Name of the folder where the temp files will be stored

Constructor Detail

JsonSimpleDiscovererServlet

public JsonSimpleDiscovererServlet()

Method Detail

init

public void init()
          throws javax.servlet.ServletException

Uses the super class init method and additionally initializes folderName

Overrides:

init in class AbstractJsonDiscoverer

Throws:

javax.servlet.ServletException

See Also:

AbstractJsonDiscoverer.init()

doPost

protected void doPost(javax.servlet.http.HttpServletRequest request,
                      javax.servlet.http.HttpServletResponse response)
               throws javax.servlet.ServletException,
                      java.io.IOException

Performs a POST call to this servlet.

Receives a JSON document (in the parameter set in AbstractJsonDiscoverer.jsonParam)

Discovers a metamodel (using JsonSimpleDiscoverer) and returns two params:

• An image of the metamodel encoded in base64
• The XMI of the metamodel encoded as base64

Overrides:

doPost in class javax.servlet.http.HttpServlet

Parameters:

request - The Request of the call

response - The Response to the call

Throws:

javax.servlet.ServletException

java.io.IOException

See Also:

HttpServlet.doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)

discoverMetamodel

private org.eclipse.emf.ecore.EPackage discoverMetamodel(java.lang.String jsonCode)
                                                  throws javax.servlet.ServletException

Discover a metamodel from a JSON document.

THe method uses JsonSimpleDiscoverer to discover the metamodel (as EPackage)

Parameters:

jsonCode - The JSON document

Returns:

The Epackage The metamodel

Throws:

javax.servlet.ServletException - Usually triggered with IO-related issues

convertToImage

private java.io.File convertToImage(org.eclipse.emf.ecore.EPackage ePackage)
                             throws javax.servlet.ServletException

Converts a EPackage into a picture and saves it in disk.

The method relies on AbstractJsonDiscoverer.drawModel(List, String)

Parameters:

ePackage - The metamodel

Returns:

The file with the picture

Throws:

javax.servlet.ServletException - Something went wrong doing IO things

discoverMetamodelBase64

private java.lang.String discoverMetamodelBase64(org.eclipse.emf.ecore.EPackage ePackage)
                                          throws javax.servlet.ServletException

Performs the discovery and returns a picture encoded in BASE64 with the picture representing the discovered metamodel

The method relies on convertToImage(EPackage) and AbstractJsonDiscoverer.encodeToString(File)

Parameters:

ePackage - The metamodel

Returns:

A String encoded in base64 representing the picture of the metamodel

Throws:

javax.servlet.ServletException - Something went wrong with IO