Creating WSDL Extensions in Java

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CHAPTER 14 Creating WSDL Extensions
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Contributing to WSDL 11 Validation
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WSDL 11 validation is included in WTP, but out of the box does not know how to validate all possible extension elements declared in extension namespaces, like the WTP SOAP namespace, and for good reason The WSDL extensions were not known at the time the specification was written If all the extensions were known at that time, there would not have been a need to create an open content model To complete the editing experience, you will need to extend WSDL validation to test the WTP SOAP binding elements Because you declared the WTP SOAP schema in the XML catalog, you will get partial validation for free from XML schema validation Schema validation does not completely cover the requirements of the WTP SOAP namespace, specified in the WSDL 11 specification, so you will need to implement a custom WTP SOAP validator In order to keep the example simple, you will only check one constraint According to the WSDL 11 specification, every SOAP binding element must specify a transport attribute This means a WTP SOAP binding element must contain a transport attribute with a non-empty value
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XML Well-Formedness Check
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WSDL 11 Validation/ Extension Namespace Validation
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Custom Validation
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Figure 1414 The Three Stages of WSDL Validation
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Tip: The meaning of the transport attribute is not relevant here All you need to know is that it is required on every WTP SOAP binding element
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Extending WSDL Validation
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WTP s WSDL validator defines the following extension point:
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orgeclipsewstwsdlvalidationwsdl11validator
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This extension point allows validation logic for a WSDL 11 extension namespace, in your case:
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http://eclipsewtporg/wsdl/soap/
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to be contributed to stage 2 of WSDL validation To extend the WSDL validator you must first create a dependency on the WSDL validator plug-in In the plug-in manifest editor, select the Dependencies tab and add the following dependency on the plug-in:
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orgeclipsewstwsdlvalidation
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A dependency, which you added in the previous section, is also required for the plug-in
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orgwsdl4j
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a lightweight WSDL model used in WTP for validation Next, extend the WSDL validator extension point shown above by adding a new extension on the Extensions tab Right click on the extension and create a new validator (see Figure 1415) The validator requires that two pieces of information be specified: namespace and class The namespace is that of the extension elements that will be validated, in your case:
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http://eclipsewtporg/wsdl/soap/
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Figure 1415 WTP SOAP Validator Declaration
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The class is the class that implements
orgeclipsewstwsdlvalidationinternalwsdl11IWSDL11Validator
and provides the validation logic for the elements In your case, specify the class
CHAPTER 14 Creating WSDL Extensions
orgeclipsewtpwsdlextensionsSOAPValidator
Your contribution to pluginxml can be seen in Example 1414
Example 1414 Listing of the WTP SOAP Validator Extension in pluginxml
<extension point="orgeclipsewstwsdlvalidationwsdl11validator"> <validator class="orgeclipsewtpwsdlextensionsSOAPValidator" namespace="http://eclipsewtporg/wsdl/soap/"/> </extension>
As said above, the class that implements the validation logic must implement (see Example 1415) This interface contains a single method, validate The validate method is where the validation logic for the validator resides In your case, this is where the test of the WTP SOAP binding element will be performed This validate method will be called for each element in the namespace that is encountered in the WSDL document The three parameters, element, parents, and valInfo, contain the element to validate, a list of the parent elements of the element to validate, and a validation information object that is used for reporting errors and warnings
IWSDL11Validator
Example 1415 Listing of IWSDL11Validatorjava
package orgeclipsewstwsdlvalidationinternalwsdl11; import javautilList; public interface IWSDL11Validator { public void validate(Object element, List parents, IWSDL11ValidationInfo valInfo); }
With the extension defined, you should now create the class containing the validation logic Create the class
orgeclipsewtpwsdlextensionsSOAPValidator
by clicking on the class property for the validator extension declaration Ensure the class implements this interface:
orgeclipsewstwsdlvalidationinternalwsdl11IWSDL11Validator
Implement the test for the SOAP binding transport as shown in Example 1416
Extending WSDL Validation
Example 1416 Listing of SOAPValidatorjava
package orgeclipsewtpwsdlextensions; import javautilList; import javaxwsdlextensionsUnknownExtensibilityElement; import javaxxmlnamespaceQName; import orgeclipsewstwsdlvalidationwsdl11IWSDL11ValidationInfo; import orgeclipsewstwsdlvalidationwsdl11IWSDL11Validator; public class SOAPValidator implements IWSDL11Validator { public void validate(Object element, List parents, IWSDL11ValidationInfo valInfo) { if(element instanceof UnknownExtensibilityElement) { UnknownExtensibilityElement soapElem = (UnknownExtensibilityElement)element; QName name = soapElemgetElementType(); if(namegetLocalPart()equals("binding")) { String transport = soapElemgetElement() getAttribute("transport"); if(transport == null || transportequals("")) { valInfoaddError("A transport must be specified for the " + "WTP SOAP binding element", element); } } } } }
The test shown in the validate method first checks whether the element is a SOAP binding element If so, its transport attribute is retrieved and checked to ensure it is not null and not empty If the transport contains a value, the method returns If not, an error is added to the IWSDL11ValidationInfo object The addError method on the IWSDL11ValidationInfo interface takes a string error message and the element the message was found on The element will be used to determine the line and column location information for the error message You can set these values yourself using the alternate addError method that accepts the line and column numbers and the URI of the file containing the element Now is a good time to test what you ve just completed Launch your runtime workbench and validate the valid Echowsdl WSDL document by right clicking on the file in the Project Explorer and selecting Validate Change the value of the SOAP binding transport to an empty string to see the error message produced by your WTP SOAP validator displayed in the Problems view (see Figure 1416)