AstDeserializer.java revision 1070:34d55faf0b3a 
1/*
2 * Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25package jdk.nashorn.internal.runtime;
26
27import java.io.ByteArrayInputStream;
28import java.io.IOException;
29import java.io.ObjectInputStream;
30import java.util.zip.InflaterInputStream;
31import jdk.nashorn.internal.ir.FunctionNode;
32
33/**
34 * This static utility class performs deserialization of FunctionNode ASTs from a byte array.
35 * The format is a standard Java serialization stream, deflated.
36 */
37final class AstDeserializer {
38    static FunctionNode deserialize(final byte[] serializedAst) {
39        try {
40            return (FunctionNode)new ObjectInputStream(new InflaterInputStream(new ByteArrayInputStream(
41                    serializedAst))).readObject();
42        } catch (final ClassNotFoundException | IOException e) {
43            // This is internal, can't happen
44            throw new AssertionError("Unexpected exception deserializing function", e);
45        }
46    }
47}
48