8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/java/net/ProxySelector.java

@@ -0,0 +1,212 @@
+/*
+ * Copyright (c) 2003, 2013, 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 java.net;
+
+import java.io.IOException;
+import java.util.List;
+import sun.security.util.SecurityConstants;
+
+/**
+ * Selects the proxy server to use, if any, when connecting to the
+ * network resource referenced by a URL. A proxy selector is a
+ * concrete sub-class of this class and is registered by invoking the
+ * {@link java.net.ProxySelector#setDefault setDefault} method. The
+ * currently registered proxy selector can be retrieved by calling
+ * {@link java.net.ProxySelector#getDefault getDefault} method.
+ *
+ * <p> When a proxy selector is registered, for instance, a subclass
+ * of URLConnection class should call the {@link #select select}
+ * method for each URL request so that the proxy selector can decide
+ * if a direct, or proxied connection should be used. The {@link
+ * #select select} method returns an iterator over a collection with
+ * the preferred connection approach.
+ *
+ * <p> If a connection cannot be established to a proxy (PROXY or
+ * SOCKS) servers then the caller should call the proxy selector's
+ * {@link #connectFailed connectFailed} method to notify the proxy
+ * selector that the proxy server is unavailable. </p>
+ *
+ * <P>The default proxy selector does enforce a
+ * <a href="doc-files/net-properties.html#Proxies">set of System Properties</a>
+ * related to proxy settings.</P>
+ *
+ * @author Yingxian Wang
+ * @author Jean-Christophe Collet
+ * @since 1.5
+ */
+public abstract class ProxySelector {
+    /**
+     * The system wide proxy selector that selects the proxy server to
+     * use, if any, when connecting to a remote object referenced by
+     * an URL.
+     *
+     * @see #setDefault(ProxySelector)
+     */
+    private static ProxySelector theProxySelector;
+
+    static {
+        try {
+            Class<?> c = Class.forName("sun.net.spi.DefaultProxySelector");
+            if (c != null && ProxySelector.class.isAssignableFrom(c)) {
+                @SuppressWarnings("deprecation")
+                ProxySelector tmp = (ProxySelector) c.newInstance();
+                theProxySelector = tmp;
+            }
+        } catch (Exception e) {
+            theProxySelector = null;
+        }
+    }
+
+    /**
+     * Gets the system-wide proxy selector.
+     *
+     * @throws  SecurityException
+     *          If a security manager has been installed and it denies
+     * {@link NetPermission}{@code ("getProxySelector")}
+     * @see #setDefault(ProxySelector)
+     * @return the system-wide {@code ProxySelector}
+     * @since 1.5
+     */
+    public static ProxySelector getDefault() {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            sm.checkPermission(SecurityConstants.GET_PROXYSELECTOR_PERMISSION);
+        }
+        return theProxySelector;
+    }
+
+    /**
+     * Sets (or unsets) the system-wide proxy selector.
+     *
+     * Note: non-standard protocol handlers may ignore this setting.
+     *
+     * @param ps The HTTP proxy selector, or
+     *          {@code null} to unset the proxy selector.
+     *
+     * @throws  SecurityException
+     *          If a security manager has been installed and it denies
+     * {@link NetPermission}{@code ("setProxySelector")}
+     *
+     * @see #getDefault()
+     * @since 1.5
+     */
+    public static void setDefault(ProxySelector ps) {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            sm.checkPermission(SecurityConstants.SET_PROXYSELECTOR_PERMISSION);
+        }
+        theProxySelector = ps;
+    }
+
+    /**
+     * Selects all the applicable proxies based on the protocol to
+     * access the resource with and a destination address to access
+     * the resource at.
+     * The format of the URI is defined as follow:
+     * <UL>
+     * <LI>http URI for http connections</LI>
+     * <LI>https URI for https connections
+     * <LI>{@code socket://host:port}<br>
+     *     for tcp client sockets connections</LI>
+     * </UL>
+     *
+     * @param   uri
+     *          The URI that a connection is required to
+     *
+     * @return  a List of Proxies. Each element in the
+     *          the List is of type
+     *          {@link java.net.Proxy Proxy};
+     *          when no proxy is available, the list will
+     *          contain one element of type
+     *          {@link java.net.Proxy Proxy}
+     *          that represents a direct connection.
+     * @throws IllegalArgumentException if the argument is null
+     */
+    public abstract List<Proxy> select(URI uri);
+
+    /**
+     * Called to indicate that a connection could not be established
+     * to a proxy/socks server. An implementation of this method can
+     * temporarily remove the proxies or reorder the sequence of
+     * proxies returned by {@link #select(URI)}, using the address
+     * and the IOException caught when trying to connect.
+     *
+     * @param   uri
+     *          The URI that the proxy at sa failed to serve.
+     * @param   sa
+     *          The socket address of the proxy/SOCKS server
+     *
+     * @param   ioe
+     *          The I/O exception thrown when the connect failed.
+     * @throws IllegalArgumentException if either argument is null
+     */
+    public abstract void connectFailed(URI uri, SocketAddress sa, IOException ioe);
+
+    /**
+     * Returns a ProxySelector which uses the given proxy address for all HTTP
+     * and HTTPS requests. If proxy is {@code null} then proxying is disabled.
+     *
+     * @param proxyAddress
+     *        The address of the proxy
+     *
+     * @return a ProxySelector
+     *
+     * @since 9
+     */
+    public static ProxySelector of(InetSocketAddress proxyAddress) {
+        return new StaticProxySelector(proxyAddress);
+    }
+
+    static class StaticProxySelector extends ProxySelector {
+        private static final List<Proxy> NO_PROXY_LIST = List.of(Proxy.NO_PROXY);
+        final List<Proxy> list;
+
+        StaticProxySelector(InetSocketAddress address){
+            Proxy p;
+            if (address == null) {
+                p = Proxy.NO_PROXY;
+            } else {
+                p = new Proxy(Proxy.Type.HTTP, address);
+            }
+            list = List.of(p);
+        }
+
+        @Override
+        public void connectFailed(URI uri, SocketAddress sa, IOException e) {
+            /* ignore */
+        }
+
+        @Override
+        public synchronized List<Proxy> select(URI uri) {
+            String scheme = uri.getScheme().toLowerCase();
+            if (scheme.equals("http") || scheme.equals("https")) {
+                return list;
+            } else {
+                return NO_PROXY_LIST;
+            }
+        }
+    }
+}