Xsd (#26)

* Export interface to MathML schema
* Help others to work the MathML XSD Schema.

Author: physikerwelt

mathml-core/src/main/java/com/formulasearchengine/mathmltools/mml/MathDoc.java

@@ -4,6 +4,7 @@
 import com.formulasearchengine.mathmltools.io.XmlDocumentReader;
 import com.formulasearchengine.mathmltools.utils.mml.CSymbol;
 import com.formulasearchengine.mathmltools.xml.PartialLocalEntityResolver;
+import com.sun.org.apache.xerces.internal.dom.DOMInputImpl;
 import org.apache.commons.lang3.NotImplementedException;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -103,14 +104,22 @@ public static String tryFixHeader(String inputXMLString, String prefix) {
         return inputXMLString;
     }
 
-    private static Validator getXsdValidator() throws ParserConfigurationException, IOException, SAXException, URISyntaxException {
+    public static DOMInputImpl getMathMLSchema() {
+        SchemaInput schemaInput = new SchemaInput().invoke();
+        InputSource inputSource = schemaInput.getInputSource();
+        final DOMInputImpl input = new DOMInputImpl();
+        input.setByteStream(inputSource.getByteStream());
+        input.setPublicId(inputSource.getPublicId());
+        input.setSystemId(inputSource.getSystemId());
+        return input;
+    }
+
+    private static Validator getXsdValidator() {
         if (v == null) {
-            SchemaFactory schemaFactory = SchemaFactory.newInstance(Languages.W3C_XML_SCHEMA_NS_URI);
-            final PartialLocalEntityResolver resolver = new PartialLocalEntityResolver();
-            schemaFactory.setResourceResolver(resolver);
+            SchemaInput schemaInput = new SchemaInput().invoke();
+            SchemaFactory schemaFactory = schemaInput.getSchemaFactory();
+            InputSource inputSource = schemaInput.getInputSource();
             v = new JAXPValidator(Languages.W3C_XML_SCHEMA_NS_URI, schemaFactory);
-            final InputSource inputSource = resolver.resolveEntity("math", MATHML3_XSD);
-            assert inputSource != null;
             final StreamSource streamSource = new StreamSource(inputSource.getByteStream());
             streamSource.setPublicId(inputSource.getPublicId());
             streamSource.setSystemId(inputSource.getSystemId());
@@ -197,4 +206,26 @@ List<CSymbol> getCSymbols() {
     public Document getDom() {
         return dom;
     }
+
+    private static class SchemaInput {
+        private SchemaFactory schemaFactory;
+        private InputSource inputSource;
+
+        SchemaFactory getSchemaFactory() {
+            return schemaFactory;
+        }
+
+        InputSource getInputSource() {
+            return inputSource;
+        }
+
+        SchemaInput invoke() {
+            schemaFactory = SchemaFactory.newInstance(Languages.W3C_XML_SCHEMA_NS_URI);
+            final PartialLocalEntityResolver resolver = new PartialLocalEntityResolver();
+            schemaFactory.setResourceResolver(resolver);
+            inputSource = resolver.resolveEntity("math", MATHML3_XSD);
+            assert inputSource != null;
+            return this;
+        }
+    }
 }

mathml-core/src/test/java/com/formulasearchengine/mathmltools/mml/MathDocTest.java

@@ -0,0 +1,20 @@
+package com.formulasearchengine.mathmltools.mml;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import com.sun.org.apache.xerces.internal.xs.XSImplementation;
+import com.sun.org.apache.xerces.internal.xs.XSLoader;
+import com.sun.org.apache.xerces.internal.xs.XSModel;
+import org.junit.jupiter.api.Test;
+import org.w3c.dom.bootstrap.DOMImplementationRegistry;
+
+class MathDocTest {
+
+    @Test
+    void getXsdValidator() throws InstantiationException, IllegalAccessException, ClassNotFoundException {
+        final DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();
+        final XSImplementation impl = (XSImplementation) registry.getDOMImplementation("XS-Loader");
+        XSLoader loader = impl.createXSLoader(null);
+        XSModel xsd = loader.load(MathDoc.getMathMLSchema());
+        assertEquals(2,xsd.getNamespaces().getLength());
+    }
+}