| /* |
| * Copyright (c) 2010, 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 jdk.nashorn.api.scripting; |
| |
| import java.io.CharArrayReader; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.net.URL; |
| import java.nio.charset.Charset; |
| import java.util.Objects; |
| import jdk.nashorn.internal.runtime.Source; |
| |
| /** |
| * A Reader that reads from a URL. Used to make sure that the reader |
| * reads content from given URL and can be trusted to do so. |
| * |
| * @since 1.8u40 |
| */ |
| public final class URLReader extends Reader { |
| // underlying URL |
| private final URL url; |
| // Charset used to convert |
| private final Charset cs; |
| |
| // lazily initialized underlying reader for URL |
| private Reader reader; |
| |
| /** |
| * Constructor |
| * |
| * @param url URL for this URLReader |
| * @throws NullPointerException if url is null |
| */ |
| public URLReader(final URL url) { |
| this(url, (Charset)null); |
| } |
| |
| /** |
| * Constructor |
| * |
| * @param url URL for this URLReader |
| * @param charsetName Name of the Charset used to convert bytes to chars |
| * @throws NullPointerException if url is null |
| */ |
| public URLReader(final URL url, final String charsetName) { |
| this(url, Charset.forName(charsetName)); |
| } |
| |
| /** |
| * Constructor |
| * |
| * @param url URL for this URLReader |
| * @param cs Charset used to convert bytes to chars |
| * @throws NullPointerException if url is null |
| */ |
| public URLReader(final URL url, final Charset cs) { |
| this.url = Objects.requireNonNull(url); |
| this.cs = cs; |
| } |
| |
| @Override |
| public int read(final char cbuf[], final int off, final int len) throws IOException { |
| return getReader().read(cbuf, off, len); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| getReader().close(); |
| } |
| |
| /** |
| * URL of this reader |
| * @return the URL from which this reader reads. |
| */ |
| public URL getURL() { |
| return url; |
| } |
| |
| /** |
| * Charset used by this reader |
| * |
| * @return the Charset used to convert bytes to chars |
| */ |
| public Charset getCharset() { |
| return cs; |
| } |
| |
| // lazily initialize char array reader using URL content |
| private Reader getReader() throws IOException { |
| synchronized (lock) { |
| if (reader == null) { |
| reader = new CharArrayReader(Source.readFully(url, cs)); |
| } |
| } |
| |
| return reader; |
| } |
| } |