1 files changed, 92 insertions, 0 deletions
diff --git a/src/org/xbill/DNS/DClass.java b/src/org/xbill/DNS/DClass.java
new file mode 100644
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--- /dev/null
+++ b/src/org/xbill/DNS/DClass.java
@@ -0,0 +1,92 @@
+// Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org)
+
+package org.xbill.DNS;
+
+/**
+ * Constants and functions relating to DNS classes.  This is called DClass
+ * to avoid confusion with Class.
+ *
+ * @author Brian Wellington
+ */
+
+public final class DClass {
+
+/** Internet */
+public static final int IN		= 1;
+
+/** Chaos network (MIT) */
+public static final int CH		= 3;
+
+/** Chaos network (MIT, alternate name) */
+public static final int CHAOS		= 3;
+
+/** Hesiod name server (MIT) */
+public static final int HS		= 4;
+
+/** Hesiod name server (MIT, alternate name) */
+public static final int HESIOD		= 4;
+
+/** Special value used in dynamic update messages */
+public static final int NONE		= 254;
+
+/** Matches any class */
+public static final int ANY		= 255;
+
+private static class DClassMnemonic extends Mnemonic {
+	public
+	DClassMnemonic() {
+		super("DClass", CASE_UPPER);
+		setPrefix("CLASS");
+	}
+
+	public void
+	check(int val) {
+		DClass.check(val);
+	}
+}
+
+private static Mnemonic classes = new DClassMnemonic();
+
+static {
+	classes.add(IN, "IN");
+	classes.add(CH, "CH");
+	classes.addAlias(CH, "CHAOS");
+	classes.add(HS, "HS");
+	classes.addAlias(HS, "HESIOD");
+	classes.add(NONE, "NONE");
+	classes.add(ANY, "ANY");
+}
+
+private
+DClass() {}
+
+/**
+ * Checks that a numeric DClass is valid.
+ * @throws InvalidDClassException The class is out of range.
+ */
+public static void
+check(int i) {
+	if (i < 0 || i > 0xFFFF)
+		throw new InvalidDClassException(i);
+}
+
+/**
+ * Converts a numeric DClass into a String
+ * @return The canonical string representation of the class
+ * @throws InvalidDClassException The class is out of range.
+ */
+public static String
+string(int i) {
+	return classes.getText(i);
+}
+
+/**
+ * Converts a String representation of a DClass into its numeric value
+ * @return The class code, or -1 on error.
+ */
+public static int
+value(String s) {
+	return classes.getValue(s);
+}
+
+}