add method to validate XML against a schema #2579

src/main/java/edu/harvard/iq/dataverse/util/xml/XmlValidator.java

@@ -0,0 +1,35 @@
+package edu.harvard.iq.dataverse.util.xml;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.logging.Logger;
+import javax.xml.transform.Source;
+import javax.xml.XMLConstants;
+import javax.xml.transform.stream.StreamSource;
+import javax.xml.validation.Schema;
+import javax.xml.validation.SchemaFactory;
+import javax.xml.validation.Validator;
+import org.xml.sax.SAXException;
+
+public class XmlValidator {
+
+    private static final Logger logger = Logger.getLogger(XmlValidator.class.getCanonicalName());
+
+    public static boolean validateXml(String fileToValidate, String schemaToValidateAgainst) throws IOException, SAXException {
+
+        StreamSource schemaFile = new StreamSource(new File(schemaToValidateAgainst));
+        Source xmlFile = new StreamSource(new File(fileToValidate));
+        SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
+        Schema schema = schemaFactory.newSchema(schemaFile);
+        Validator validator = schema.newValidator();
+        try {
+            validator.validate(xmlFile);
+            logger.info(xmlFile.getSystemId() + " is valid");
+            return true;
+        } catch (SAXException ex) {
+            logger.info(xmlFile.getSystemId() + " is not valid: " + ex.getLocalizedMessage());
+            return false;
+        }
+    }
+
+}