| /* |
| * Copyright (c) 2010, 2014, 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.internal.runtime; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectOutputStream; |
| import java.util.zip.Deflater; |
| import java.util.zip.DeflaterOutputStream; |
| import jdk.nashorn.internal.ir.FunctionNode; |
| import jdk.nashorn.internal.runtime.options.Options; |
| |
| /** |
| * This static utility class performs serialization of FunctionNode ASTs to a byte array. |
| * The format is a standard Java serialization stream, deflated. |
| */ |
| final class AstSerializer { |
| // Experimentally, we concluded that compression level 4 gives a good tradeoff between serialization speed |
| // and size. |
| private static final int COMPRESSION_LEVEL = Options.getIntProperty("nashorn.serialize.compression", 4); |
| static byte[] serialize(final FunctionNode fn) { |
| final ByteArrayOutputStream out = new ByteArrayOutputStream(); |
| final Deflater deflater = new Deflater(COMPRESSION_LEVEL); |
| try (final ObjectOutputStream oout = new ObjectOutputStream(new DeflaterOutputStream(out, deflater))) { |
| oout.writeObject(fn); |
| } catch (final IOException e) { |
| throw new AssertionError("Unexpected exception serializing function", e); |
| } finally { |
| deflater.end(); |
| } |
| return out.toByteArray(); |
| } |
| } |