1 files changed, 202 insertions, 0 deletions
diff --git a/src/org/xbill/DNS/SetResponse.java b/src/org/xbill/DNS/SetResponse.java
new file mode 100644
index 0000000..05d9f32
--- /dev/null
+++ b/src/org/xbill/DNS/SetResponse.java
@@ -0,0 +1,202 @@
+// Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org)
+
+package org.xbill.DNS;
+
+import java.util.*;
+
+/**
+ * The Response from a query to Cache.lookupRecords() or Zone.findRecords()
+ * @see Cache
+ * @see Zone
+ *
+ * @author Brian Wellington
+ */
+
+public class SetResponse {
+
+/**
+ * The Cache contains no information about the requested name/type
+ */
+static final int UNKNOWN	= 0;
+
+/**
+ * The Zone does not contain the requested name, or the Cache has
+ * determined that the name does not exist.
+ */
+static final int NXDOMAIN	= 1;
+
+/**
+ * The Zone contains the name, but no data of the requested type,
+ * or the Cache has determined that the name exists and has no data
+ * of the requested type.
+ */
+static final int NXRRSET	= 2;
+
+/**
+ * A delegation enclosing the requested name was found.
+ */
+static final int DELEGATION	= 3;
+
+/**
+ * The Cache/Zone found a CNAME when looking for the name.
+ * @see CNAMERecord
+ */
+static final int CNAME		= 4;
+
+/**
+ * The Cache/Zone found a DNAME when looking for the name.
+ * @see DNAMERecord
+ */
+static final int DNAME		= 5;
+
+/**
+ * The Cache/Zone has successfully answered the question for the
+ * requested name/type/class.
+ */
+static final int SUCCESSFUL	= 6;
+
+private static final SetResponse unknown = new SetResponse(UNKNOWN);
+private static final SetResponse nxdomain = new SetResponse(NXDOMAIN);
+private static final SetResponse nxrrset = new SetResponse(NXRRSET);
+
+private int type;
+private Object data;
+
+private
+SetResponse() {}
+
+SetResponse(int type, RRset rrset) {
+	if (type < 0 || type > 6)
+		throw new IllegalArgumentException("invalid type");
+	this.type = type;
+	this.data = rrset;
+}
+
+SetResponse(int type) {
+	if (type < 0 || type > 6)
+		throw new IllegalArgumentException("invalid type");
+	this.type = type;
+	this.data = null;
+}
+
+static SetResponse
+ofType(int type) {
+	switch (type) {
+		case UNKNOWN:
+			return unknown;
+		case NXDOMAIN:
+			return nxdomain;
+		case NXRRSET:
+			return nxrrset;
+		case DELEGATION:
+		case CNAME:
+		case DNAME:
+		case SUCCESSFUL:
+			SetResponse sr = new SetResponse();
+			sr.type = type;
+			sr.data = null;
+			return sr;
+		default:
+			throw new IllegalArgumentException("invalid type");
+	}
+}
+
+void
+addRRset(RRset rrset) {
+	if (data == null)
+		data = new ArrayList();
+	List l = (List) data;
+	l.add(rrset);
+}
+
+/** Is the answer to the query unknown? */
+public boolean
+isUnknown() {
+	return (type == UNKNOWN);
+}
+
+/** Is the answer to the query that the name does not exist? */
+public boolean
+isNXDOMAIN() {
+	return (type == NXDOMAIN);
+}
+
+/** Is the answer to the query that the name exists, but the type does not? */
+public boolean
+isNXRRSET() {
+	return (type == NXRRSET);
+}
+
+/** Is the result of the lookup that the name is below a delegation? */
+public boolean
+isDelegation() {
+	return (type == DELEGATION);
+}
+
+/** Is the result of the lookup a CNAME? */
+public boolean
+isCNAME() {
+	return (type == CNAME);
+}
+
+/** Is the result of the lookup a DNAME? */
+public boolean
+isDNAME() {
+	return (type == DNAME);
+}
+
+/** Was the query successful? */
+public boolean
+isSuccessful() {
+	return (type == SUCCESSFUL);
+}
+
+/** If the query was successful, return the answers */
+public RRset []
+answers() {
+	if (type != SUCCESSFUL)
+		return null;
+	List l = (List) data;
+	return (RRset []) l.toArray(new RRset[l.size()]);
+}
+
+/**
+ * If the query encountered a CNAME, return it.
+ */
+public CNAMERecord
+getCNAME() {
+	return (CNAMERecord)((RRset)data).first();
+}
+
+/**
+ * If the query encountered a DNAME, return it.
+ */
+public DNAMERecord
+getDNAME() {
+	return (DNAMERecord)((RRset)data).first();
+}
+
+/**
+ * If the query hit a delegation point, return the NS set.
+ */
+public RRset
+getNS() {
+	return (RRset)data;
+}
+
+/** Prints the value of the SetResponse */
+public String
+toString() {
+	switch (type) {
+		case UNKNOWN:		return "unknown";
+		case NXDOMAIN:		return "NXDOMAIN";
+		case NXRRSET:		return "NXRRSET";
+		case DELEGATION:	return "delegation: " + data;
+		case CNAME:		return "CNAME: " + data;
+		case DNAME:		return "DNAME: " + data;
+		case SUCCESSFUL:	return "successful";
+		default:		throw new IllegalStateException();
+	}
+}
+
+}