From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Tue, 10 Mar 2009 17:39:09 +0000 (+0100)
Subject: Add parser factory.
X-Git-Url: https://git.pterodactylus.net/?p=arachne.git;a=commitdiff_plain;h=a0072b36c131c30d4c100992b567a8e3bf687aec

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
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;
+	}
+
+}