SOA / Web Services / Java

A Technology Blog

Parse WSDL effectively

Posted by Vivek on February 4, 2009

As a WSDL’s constituents are well-defined already, it is feasible to use a parser that can get the elements of the WSDL using APIs that are already defined. This will minimize complexity in the code and will help in achieving better performance.

 

Oracle WSDL parser is one such option.

 

It is only needed to import the necessary classes as the APIs are already defined and packaged with wsdl.jar.

 

//importing the necessary classes from library

import oracle.wsdl.WSDLDocument;

import oracle.wsdl.internal.Binding;

import oracle.wsdl.internal.Definitions;

import oracle.wsdl.internal.Documentation;

import oracle.wsdl.internal.Import;

import oracle.wsdl.internal.Message;

import oracle.wsdl.internal.PortType;

…….

 

 

WSDLDocument wsdldoc = new WSDLDocument(wsdl_url);

//getting definition element

Definitions definition = wsdldoc.getDefinitions();

//getting service element

Map servicesMap = definition.getServices();

//getting binding element

Map bindingsMap = definition.getBindings();

//getting PortType element

Map ptypesMap = definition.getPortTypes();

//getting message element

Map messagesMap = definition.getMessages();

//getting import details

Map importsMap = definition.getImports();

//getting documentation details

Documentation docs = definition.getDocumentation();

 

 

As there can be multiple elements, an “iterator” can be used to parse an individual element.

For Example:

 

Iterator iterator = servicesMap.entrySet().iterator();

        while (iterator.hasNext()) {

            Map.Entry me = (Map.Entry) iterator.next();

            …….

        }

 

The above code fragments keep things fairly simple while processing a WSDL.

 

Apache Woden

 

Woden provides Java class library for reading, manipulating, creating and writing WSDL documents.

 

Woden’s DOM-based XML parsing depends on Apache Xerces 2.7.1. Its XML Schema support it depends on the schema parser and object model implemented by the Apache Web Services Commons (ws-commons) XmlSchema project.

 

//importing necessary classes from woden jars

import org.apache.woden.WSDLException;

import org.apache.woden.WSDLFactory;

import org.apache.woden.WSDLReader;

import org.apache.woden.wsdl20.Binding;

import org.apache.woden.wsdl20.Description;

import org.apache.woden.wsdl20.Interface;

import org.apache.woden.wsdl20.Service;

….

 

  

 

WSDLFactory factory = WSDLFactory.newInstance();

WSDLReader reader = factory.newWSDLReader();

reader.setFeature(WSDLReader.FEATURE_VALIDATION, true);

String wsdlurl = “C://axis2-1.4.1//newwsdl.wsdl”;

 

//reading the WSDL Document

DescriptionElement descElem = (DescriptionElement) reader.readWSDL(wsdlurl);

Description descComp = descElem.toComponent();

 

//getting Interface, Binding and Service elements

InterfaceElement[] interfaces = descElem.getInterfaceElements();

BindingElement[] bindings = descElem.getBindingElements();

ServiceElement[] services = descElem.getServiceElements();

  

 

Complete details about usage and extensibility of woden are available at:

 

http://ws.apache.org/woden/userguide.html

 

JWSDL:

 

 

JWSDL is another option that is intended for use by developers of Web services tools and others who need to utilize WSDL documents in Java.

JWSDL is designed to allow users to read, modify, write, create and re-organize WSDL documents in memory. JWSDL is not designed to validate WSDL documents beyond syntactic validity. One use of JWSDL is to develop a tool that validates WSDL semantically.

JWSDL is designed for use in WSDL editors and tools where a partial, incomplete or incorrect WSDL document may require representation.

 

Details of JWSDL can be obtained by accessing the following link:

 

http://wsdl4j.sourceforge.net/downloads/JSR110_proposed_final_draft.pdf

Advertisements

5 Responses to “Parse WSDL effectively”

  1. I want to add one more WSDL parser to your list. Membrane SOA Model is a parser and object model for WSDL and XML schema. You can create WSDL’s and the corresponding XML schema documents with a few lines of code.

    Like

  2. matt vagnoni said

    Where can you download Oracle WSDL Parser?

    Like

  3. Where can you download wsdl.jar?

    Like

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

 
%d bloggers like this: