8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/sun/net/dns/ResolverConfiguration.java

@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.net.dns;
+
+import java.util.List;
+
+/**
+ * The configuration of the client resolver.
+ *
+ * <p>A ResolverConfiguration is a singleton that represents the
+ * configuration of the client resolver. The ResolverConfiguration
+ * is opened by invoking the {@link #open() open} method.
+ *
+ * @since 1.4
+ */
+
+public abstract class ResolverConfiguration {
+
+    private static final Object lock = new Object();
+
+    private static ResolverConfiguration provider;
+
+    protected ResolverConfiguration() { }
+
+    /**
+     * Opens the resolver configuration.
+     *
+     * @return the resolver configuration
+     */
+    public static ResolverConfiguration open() {
+        synchronized (lock) {
+            if (provider == null) {
+                provider = new sun.net.dns.ResolverConfigurationImpl();
+            }
+            return provider;
+        }
+    }
+
+    /**
+     * Returns a list corresponding to the domain search path. The
+     * list is ordered by the search order used for host name lookup.
+     * Each element in the list returns a {@link java.lang.String}
+     * containing a domain name or suffix.
+     *
+     * @return list of domain names
+     */
+    public abstract List<String> searchlist();
+
+    /**
+     * Returns a list of name servers used for host name lookup.
+     * Each element in the list returns a {@link java.lang.String}
+     * containing the textual representation of the IP address of
+     * the name server.
+     *
+     * @return list of the name servers
+     */
+    public abstract List<String> nameservers();
+
+
+    /**
+     * Options representing certain resolver variables of
+     * a {@link ResolverConfiguration}.
+     */
+    public abstract static class Options {
+
+        /**
+         * Returns the maximum number of attempts the resolver
+         * will connect to each name server before giving up
+         * and returning an error.
+         *
+         * @return the resolver attempts value or -1 is unknown
+         */
+        public int attempts() {
+            return -1;
+        }
+
+        /**
+         * Returns the basic retransmit timeout, in milliseconds,
+         * used by the resolver. The resolver will typically use
+         * an exponential backoff algorithm where the timeout is
+         * doubled for every retransmit attempt. The basic
+         * retransmit timeout, returned here, is the initial
+         * timeout for the exponential backoff algorithm.
+         *
+         * @return the basic retransmit timeout value or -1
+         *         if unknown
+         */
+        public int retrans() {
+            return -1;
+        }
+    }
+
+    /**
+     * Returns the {@link #Options} for the resolver.
+     *
+     * @return options for the resolver
+     */
+    public abstract Options options();
+}