Continuing the implementation of AST-to-Instr.

1 files changed, 104 insertions, 0 deletions

diff --git a/ast-to-instr/src/XMLManager.java b/ast-to-instr/src/XMLManager.java
new file mode 100644
index 0000000..03fbe6d
--- /dev/null
+++ b/ast-to-instr/src/XMLManager.java
@@ -0,0 +1,104 @@
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+import org.xml.sax.SAXException;
+
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.ParserConfigurationException;
+
+import javax.xml.xpath.XPath;
+import javax.xml.xpath.XPathExpression;
+import javax.xml.xpath.XPathExpressionException;
+import javax.xml.xpath.XPathFactory;
+
+import java.io.File;
+import java.io.IOException;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+public class XMLManager
+{
+   /* ... */
+   /* private static final DocumentBuilderFactoryCreatorMakerInstanciator; */
+   /* private static final DocumentBuilderFactoryCreatorMaker; */
+   /* private static final DocumentBuilderFactoryCreator; */
+   private static final DocumentBuilderFactory DOC_BUILDER_FACTORY;
+   private static final DocumentBuilder DOC_BUILDER;
+
+   private static final XPathFactory XPATH_FACTORY;
+   private static final XPath XPATH;
+
+   static
+   {
+      DocumentBuilder i_dont_even;
+
+      DOC_BUILDER_FACTORY = DocumentBuilderFactory.newInstance();
+
+      try
+      {
+         i_dont_even = DOC_BUILDER_FACTORY.newDocumentBuilder();
+      }
+      catch (final Exception e)
+      {
+         i_dont_even = null;
+
+         System.err.println
+         (
+            "[E] Err... You somehow managed to trigger an exception from purely"
+            + " static members:"
+         );
+
+         e.printStackTrace();
+
+         System.exit(-1);
+      }
+
+      DOC_BUILDER = i_dont_even;
+
+      XPATH_FACTORY = XPathFactory.newInstance();
+      XPATH = XPATH_FACTORY.newXPath();
+   }
+
+   private XMLManager () {} /* Utility Class. */
+
+   public static Document get_document (final String filename)
+   throws
+      SAXException,
+      IOException
+   {
+      final File file;
+
+      file = new File(filename, "r");
+
+      return DOC_BUILDER.parse(file);
+   }
+
+   public static XPathExpression compile (final String expression)
+   throws XPathExpressionException
+   {
+      return XPATH.compile(expression);
+   }
+
+   public static Collection<Node> node_list_to_node_collection
+   (
+      final NodeList nl
+   )
+   {
+      final Collection<Node> result;
+      final int nl_length;
+
+      result = new ArrayList<Node>();
+
+      nl_length = nl.getLength();
+
+      for (int i = 0; i < nl_length; ++i)
+      {
+         result.add(nl.item(i));
+      }
+
+      return result;
+   }
+}