CODEWITHSUNDEEP
javaxmlparsingdomxml-parsing
jorgen.ringen
jorgen.ringen

Reputation: 1325

Parse schema and an import in the same schema

Just wondering if there are any ways to parse a xsd file AND an xsd that's imported in the original xsd at the same time, so I can get direct access to the elements in the imported xsd. Are there any frameworks that makes this possible?

Just an example of what I mean

From the XSD that I want to parse:

<xsd:import namespace="..." schemaLocation="anotherFile.xsd">

<xsd:element ref="anElement" />

From the XSD that's imported in the parsed file

<xsd:element name="anElement">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:enumeration value="THIS" />
<xsd:enumeration value="IS" />
<xsd:enumeration value="THE" />
<xsd:enumeration value="ELEMENTS" />
<xsd:enumeration value="I" />
<xsd:enumeration value="WANT" />
<xsd:enumeration value=":-)" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>

So, What I want is to get access to the elements in the imported xsd when I'm parsing the original xsd by some kind of inlining or something :-)

Is this possible in some way?

Upvotes: 3

Views: 4267

Answers (3)

Khoa Nguyen
Khoa Nguyen

Reputation: 280

This works for me when the XSD files are either on local /src/main/resources directory or packed in a jar: 

final SchemaFactory sf = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); 
final URL url = this.getClass().getClassLoader().getResource("META-INF/parent.xsd");
final Schema schema = sf.newSchema(url);

parent.xsd has included "kid.xsd" -- both XSD files are under the same directory

Upvotes: 1

Karthik Ramachandran
Karthik Ramachandran

Reputation: 12175

Yes, you just need to implement a LSResourceResolver class that will able to read from the schema locations you specify: 

 /**
 * This function validates a DomResult. T
 *
 * @param domResult
 * @param schemaFile path to the schmea file to validate against.
 * @throws org.xml.sax.SAXException
 * @throws java.io.IOException
 *
 */
protected void validateDomResult(DOMResult domResult, String schemaFile) throws SAXException, IOException, Exception {

    Schema schema = createSchema(schemaFile);
    javax.xml.validation.Validator validator = schema.newValidator();
    ErrorHandler mySchemaErrorHandler = new LoggingErrorHandler();
    validator.setErrorHandler(mySchemaErrorHandler);
    DOMSource domSource = new DOMSource(domResult.getNode());
    validator.validate(domSource);
    if (((LoggingErrorHandler) mySchemaErrorHandler).isError()) {
        throw new Exception("Validation Error");
    }
}

/**
 *
 * @param baseSchemaFilePath
 * @return
 * @throws java.lang.Exception
 *
 */
protected Schema createSchema(String baseSchemaFilePath) throws Exception {

    SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    LSResourceResolver resourceResolver = (LSResourceResolver) new LocalSchemaLSResourceResolver();
    factory.setResourceResolver(resourceResolver);
    Schema schema = factory.newSchema(new File(baseSchemaFilePath));

    return schema;
}

Here is a simple LSResourceResolver implementation that looks for schemas in an xsd directory on the class path:

public class LocalSchemaLSResourceResolver implements LSResourceResolver{

    protected final Log logger = LogFactory.getLog(getClass());

    public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) {

        LSInput input = new DOMInputImpl();
        try {
            FileInputStream fis = new FileInputStream(new File("classpath:xsd/" + systemId));

            input.setByteStream(fis);
            return input;
        } catch (FileNotFoundException ex) {
            logger.error("File Not found", ex);
            return null;
        }

    }
}

Upvotes: 2

padis
padis

Reputation: 2354

It look like you need JAXB to get your schema (including imported schema) into Java classes.

Upvotes: 1

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