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11.4. Supported Validators

11.4.1. Java
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11.4.1.1. Use a Java Validator
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Procedure 11.2. Create a Java Validator

  1. Implement the org.switchyard.validate.Validator interface.
  2. Add a <validate.java> definition to your switchyard.xml file.
  3. Alternatively, annotate one or more methods to your Java class with @Validator: 
            
@Named("MyValidatorBean")
public class MyValidator {
    @Validator(name = "{urn:switchyard-quickstart-demo:orders:1.0}submitOrder")
    public ValidationResult validate(Element from) {
       // handle validation here
    }
}
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    When using the @Validator annotation, the SwitchYard Maven plug-in automatically generates the <validate.java> definitions for you and add them to the switchyard.xml file packaged in your application.
    The Java class above produces this <validate.java> definition: 
        
<validate.java bean="MyValidatorBean"
               name="{urn:switchyard-quickstart-demo:orders:1.0}submitOrder"/>
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11.4.1.2. Java Validator Reference
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The optional name element of the @Validator annotation can be used to specify the qualified type name used during validator registration. If not supplied, the full class name of the method parameter is used as the type.
The CDI bean name specified by @Named annotation is used to resolve validator class. If you fail to specify it, then the validator's class name is used instead: 
<validates>
   <validate.java class="org.switchyard.quickstarts.demos.orders.MyValidator"
                   name="{urn:switchyard-quickstart-demo:orders:1.0}submitOrder"/>
</transforms>
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Note
Each of the <validate.java> definitions have either a bean attribute or a class attribute. These two attributes are mutually exclusive.

11.4.1.3. ValidationResult
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ValidationResult is a simple interface which represents the result of validation. It has two methods, isValid() and getDetail().

11.4.1.4. Java Validation Failure
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If Java validation fails, the message exchange process stops immediately and a HandlerException is thrown along with a validation failure message which is returned by ValidationResult.getDetail(). Make sure that you return a ValidationResult with failure detail message when you want to indicate a validation failure in your Java Validator, instead of throwing a RuntimeException.

11.4.1.5. ValidationResult Properties
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isValid() returns whether the validation succeeded or not. _getDetail() returns an error message if validation fails. 
package org.switchyard.validate;
public interface ValidationResult {
    boolean isValid();
    String getDetail();
}
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There are three convenience methods available for org.switchyard.validate.BaseValidator. These are validResult(), invalidResult() and invalidResult(String) Use them to generate ValidationResult objects.

11.4.2. XML
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11.4.2.1. Use an XML Validator
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The XML validator allows you to perform a validation against its schema definition. It support DTD, XML_SCHEMA, and RELAX_NG schema types. You can configure an XML validator by specifying the schema Type, the name QName, and the path to the schema file. Here is an example: 
<validate.xml schemaType="XML_SCHEMA" name="{urn:switchyard-quickstart:validate-xml:0.1.0}order" failOnWarning="true" namespaceAware="true">
   <schemaFiles>
      <entry file="/xsd/orders.xsd"/>
   </schemaFiles>
   <schemaCatalogs>
      <entry file="/xsd/catalog.xml"/>
   </schemaCatalogs>
</validate.xml>
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If you specify the failOnWarning attribute as true, the validation fails if any warning is detected during validation. If the XML content to be validated has namespace prefix, then you need to specify namespaceAware as true.

11.4.2.2. XML Catalog
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You can use XML catalog to decouple the schema file location from schema definition itself. This schema is orders.xsd which has a import element. It refers to logical name orders.base by the schemaLocation attribute: 
<schema xmlns="http://www.w3.org/2001/XMLSchema"
        targetNamespace="urn:switchyard-quickstart:validate-xml:0.1.0"
        xmlns:base="urn:switchyard-quickstart:validate-xml-base:0.1.0"
        xmlns:orders="urn:switchyard-quickstart:validate-xml:0.1.0">
        <import namespace="urn:switchyard-quickstart:validate-xml-base:0.1.0" schemaLocation="orders.base"/>
...
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Here is the catalog.xml file that resolves actual schema location from logical name orders.base: 
<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog">
    <system systemId="orders.base" uri="orders-base.xsd"/>
</catalog>
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11.4.2.3. XML Validation Failure
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If XML validation fails, the message exchange process stops immediately and a HandlerException is thrown along with a validation failure message. XMLValidator collects a set of validation failures through the SAX ErrorHandler, and uses the getMessage() of each received SAXParseException as a failure detail with extracting root cause, if exists.
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