8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

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

@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 1995, 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;
+
+/**
+ * The abstract class {@code ContentHandler} is the superclass
+ * of all classes that read an {@code Object} from a
+ * {@code URLConnection}.
+ * <p>
+ * An application does not generally call the
+ * {@code getContent} method in this class directly. Instead, an
+ * application calls the {@code getContent} method in class
+ * {@code URL} or in {@code URLConnection}.
+ * The application's content handler factory (an instance of a class that
+ * implements the interface {@code ContentHandlerFactory} set up by a call to
+ * {@link URLConnection#setContentHandlerFactory(ContentHandlerFactory)
+ * setContentHandlerFactory} is called with a {@code String} giving the
+ * MIME type of the object being received on the socket. The factory returns an
+ * instance of a subclass of {@code ContentHandler}, and its
+ * {@code getContent} method is called to create the object.
+ * <p>
+ * If no content handler could be {@linkplain URLConnection#getContent() found},
+ * URLConnection will look for a content handler in a user-definable set of places.
+ * Users can define a vertical-bar delimited set of class prefixes
+ * to search through by defining the <i>{@link java.net.URLConnection#contentPathProp}</i>
+ * property. The class name must be of the form:
+ * <blockquote>
+ *     <i>{package-prefix}.{major}.{minor}</i>
+ *     <p>
+ *     where <i>{major}.{minor}</i> is formed by taking the
+ *     content-type string, replacing all slash characters with a
+ *     {@code period} ('.'), and all other non-alphanumeric characters
+ *     with the underscore character '{@code _}'. The alphanumeric
+ *     characters are specifically the 26 uppercase ASCII letters
+ *     '{@code A}' through '{@code Z}', the 26 lowercase ASCII
+ *     letters '{@code a}' through '{@code z}', and the 10 ASCII
+ *     digits '{@code 0}' through '{@code 9}'.
+ *     <p>
+ *     e.g.
+ *     YoyoDyne.experimental.text.plain
+ * </blockquote>
+ * If no user-defined content handler is found, then the system
+ * tries to load a specific <i>content-type</i> handler from one
+ * of the built-in handlers, if one exists.
+ * <p>
+ * If the loading of the content handler class would be performed by
+ * a classloader that is outside of the delegation chain of the caller,
+ * the JVM will need the RuntimePermission "getClassLoader".
+ *
+ * @author  James Gosling
+ * @see     java.net.ContentHandler#getContent(java.net.URLConnection)
+ * @see     java.net.ContentHandlerFactory
+ * @see     java.net.URL#getContent()
+ * @see     java.net.URLConnection
+ * @see     java.net.URLConnection#getContent()
+ * @see     java.net.URLConnection#setContentHandlerFactory(java.net.ContentHandlerFactory)
+ * @since   1.0
+ */
+public abstract class ContentHandler {
+
+    /**
+     * Given a URL connect stream positioned at the beginning of the
+     * representation of an object, this method reads that stream and
+     * creates an object from it.
+     *
+     * @param      urlc   a URL connection.
+     * @return     the object read by the {@code ContentHandler}.
+     * @exception  IOException  if an I/O error occurs while reading the object.
+     */
+    public abstract Object getContent(URLConnection urlc) throws IOException;
+
+    /**
+     * Given a URL connect stream positioned at the beginning of the
+     * representation of an object, this method reads that stream and
+     * creates an object that matches one of the types specified.
+     *
+     * The default implementation of this method should call
+     * {@link #getContent(URLConnection)}
+     * and screen the return type for a match of the suggested types.
+     *
+     * @param      urlc   a URL connection.
+     * @param      classes      an array of types requested
+     * @return     the object read by the {@code ContentHandler} that is
+     *                 the first match of the suggested types or
+     *                 {@code null} if none of the requested  are supported.
+     * @exception  IOException  if an I/O error occurs while reading the object.
+     * @since 1.3
+     */
+    @SuppressWarnings("rawtypes")
+    public Object getContent(URLConnection urlc, Class[] classes) throws IOException {
+        Object obj = getContent(urlc);
+
+        for (Class<?> c : classes) {
+            if (c.isInstance(obj)) {
+                return obj;
+            }
+        }
+        return null;
+    }
+}