Add parser factory.

diff --git a/src/net/pterodactylus/arachne/parser/ParserFactory.java b/src/net/pterodactylus/arachne/parser/ParserFactory.java
new file mode 100644 (file)
index 0000000..8385f73
--- /dev/null
+++ b/src/net/pterodactylus/arachne/parser/ParserFactory.java
@@ -0,0 +1,61 @@
+/*
+ * © 2009 David ‘Bombe’ Roden
+ */
+package net.pterodactylus.arachne.parser;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import de.ina.util.data.InternetMediaType;
+import de.ina.util.validation.Validation;
+
+/**
+ * Factory that can create {@link Parser} objects depending on a given content
+ * type.
+ *
+ * @author David ‘Bombe’ Roden <bombe@pterodactylus.net>
+ */
+public class ParserFactory {
+
+       /** The logger. */
+       private static final Logger logger = Logger.getLogger(ParserFactory.class.getName());
+
+       /** Mapping from MIME type to parser classes. */
+       private final Map<InternetMediaType, Class<? extends Parser>> parsers = new HashMap<InternetMediaType, Class<? extends Parser>>();
+
+       /**
+        * Creates a new parser factory using default parsers for common MIME types.
+        */
+       public ParserFactory() {
+               parsers.put(new InternetMediaType("text", "html"), HtmlEditorKitParser.class);
+       }
+
+       /**
+        * Returns a {@link Parser} for the given content type.
+        *
+        * @param contentType
+        *            The content type
+        * @return A parser for the content type, or <code>null</code> if no parser
+        *         for the given content type could be found
+        */
+       public Parser getParser(String contentType) {
+               Validation.begin().isNotNull("contentType", (Object) contentType).check();
+               InternetMediaType internetMediaType = InternetMediaType.fromString(contentType);
+               Class<? extends Parser> parserClass = parsers.get(internetMediaType);
+               if (parserClass == null) {
+                       return null;
+               }
+               try {
+                       Parser parser = parserClass.newInstance();
+                       return parser;
+               } catch (InstantiationException ie1) {
+                       logger.log(Level.WARNING, "Could not instantiate parser “" + parserClass.getName() + "!", ie1);
+               } catch (IllegalAccessException iae1) {
+                       logger.log(Level.WARNING, "Could not instantiate parser “" + parserClass.getName() + "!", iae1);
+               }
+               return null;
+       }
+
+}