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src/share/classes/sun/rmi/rmic/iiop/ClassPathLoader.java@6845b95cba6b (annotated)

src/share/classes/sun/rmi/rmic/iiop/ClassPathLoader.java

Thu, 31 Aug 2017 18:10:36 +0800

author

aoqi

date

Thu, 31 Aug 2017 18:10:36 +0800

changeset 748

6845b95cba6b

parent 158

91006f157c46

parent 0

7ef37b2cdcad

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25	package sun.rmi.rmic.iiop;
aoqi@0	26
aoqi@0	27	import java.io.*;
aoqi@0	28	import sun.tools.java.ClassPath ;
aoqi@0	29	import sun.tools.java.ClassFile ;
aoqi@0	30
aoqi@0	31	/**
aoqi@0	32	* A ClassLoader that will ultimately use a given sun.tools.java.ClassPath to
aoqi@0	33	* find the desired file. This works for any JAR files specified in the given
aoqi@0	34	* ClassPath as well -- reusing all of that wonderful sun.tools.java code.
aoqi@0	35	*
aoqi@0	36	*@author Everett Anderson
aoqi@0	37	*/
aoqi@0	38	public class ClassPathLoader extends ClassLoader
aoqi@0	39	{
aoqi@0	40	private ClassPath classPath;
aoqi@0	41
aoqi@0	42	public ClassPathLoader(ClassPath classPath) {
aoqi@0	43	this.classPath = classPath;
aoqi@0	44	}
aoqi@0	45
aoqi@0	46	// Called by the super class
aoqi@0	47	protected Class findClass(String name) throws ClassNotFoundException
aoqi@0	48	{
aoqi@0	49	byte[] b = loadClassData(name);
aoqi@0	50	return defineClass(name, b, 0, b.length);
aoqi@0	51	}
aoqi@0	52
aoqi@0	53	/**
aoqi@0	54	* Load the class with the given fully qualified name from the ClassPath.
aoqi@0	55	*/
aoqi@0	56	private byte[] loadClassData(String className)
aoqi@0	57	throws ClassNotFoundException
aoqi@0	58	{
aoqi@0	59	// Build the file name and subdirectory from the
aoqi@0	60	// class name
aoqi@0	61	String filename = className.replace('.', File.separatorChar)
aoqi@0	62	+ ".class";
aoqi@0	63
aoqi@0	64	// Have ClassPath find the file for us, and wrap it in a
aoqi@0	65	// ClassFile. Note: This is where it looks inside jar files that
aoqi@0	66	// are specified in the path.
aoqi@0	67	ClassFile classFile = classPath.getFile(filename);
aoqi@0	68
aoqi@0	69	if (classFile != null) {
aoqi@0	70
aoqi@0	71	// Provide the most specific reason for failure in addition
aoqi@0	72	// to ClassNotFound
aoqi@0	73	Exception reportedError = null;
aoqi@0	74	byte data[] = null;
aoqi@0	75
aoqi@0	76	try {
aoqi@0	77	// ClassFile is beautiful because it shields us from
aoqi@0	78	// knowing if it's a separate file or an entry in a
aoqi@0	79	// jar file.
aoqi@0	80	DataInputStream input
aoqi@0	81	= new DataInputStream(classFile.getInputStream());
aoqi@0	82
aoqi@0	83	// Can't rely on input available() since it will be
aoqi@0	84	// something unusual if it's a jar file! May need
aoqi@0	85	// to worry about a possible problem if someone
aoqi@0	86	// makes a jar file entry with a size greater than
aoqi@0	87	// max int.
aoqi@0	88	data = new byte[(int)classFile.length()];
aoqi@0	89
aoqi@0	90	try {
aoqi@0	91	input.readFully(data);
aoqi@0	92	} catch (IOException ex) {
aoqi@0	93	// Something actually went wrong reading the file. This
aoqi@0	94	// is a real error so save it to report it.
aoqi@0	95	data = null;
aoqi@0	96	reportedError = ex;
aoqi@0	97	} finally {
aoqi@0	98	// Just don't care if there's an exception on close!
aoqi@0	99	// I hate that close can throw an IOException!
aoqi@0	100	try { input.close(); } catch (IOException ex) {}
aoqi@0	101	}
aoqi@0	102	} catch (IOException ex) {
aoqi@0	103	// Couldn't get the input stream for the file. This is
aoqi@0	104	// probably also a real error.
aoqi@0	105	reportedError = ex;
aoqi@0	106	}
aoqi@0	107
aoqi@0	108	if (data == null)
aoqi@0	109	throw new ClassNotFoundException(className, reportedError);
aoqi@0	110
aoqi@0	111	return data;
aoqi@0	112	}
aoqi@0	113
aoqi@0	114	// Couldn't find the file in the class path.
aoqi@0	115	throw new ClassNotFoundException(className);
aoqi@0	116	}
aoqi@0	117	}