1 /*

     2  * Copyright (c) 1997, 2008, 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  */

    25 

    26 

    27 /*

    28  * The Original Code is HAT. The Initial Developer of the

    29  * Original Code is Bill Foote, with contributions from others

    30  * at JavaSoft/Sun.

    31  */

    32 

    33 package com.sun.tools.hat.internal.server;

    34 

    35 import com.sun.tools.hat.internal.model.JavaClass;

    36 import com.sun.tools.hat.internal.model.Snapshot;

    37 

    38 import java.util.LinkedList;

    39 import java.io.InputStream;

    40 import java.io.Reader;

    41 import java.io.InputStreamReader;

    42 import java.io.BufferedReader;

    43 import java.io.IOException;

    44 

    45 /**

    46  * This class is a helper that determines if a class is a "platform"

    47  * class or not.  It's a platform class if its name starts with one of

    48  * the prefixes to be found in /com/sun/tools/hat/resources/platform_names.txt.

    49  *

    50  * @author      Bill Foote

    51  */

    52 

    53 public class PlatformClasses  {

    54 

    55     static String[] names = null;

    56 

    57 

    58     public static synchronized String[] getNames() {

    59         if (names == null) {

    60             LinkedList<String> list = new LinkedList<String>();

    61             InputStream str

    62                 = PlatformClasses.class

    63                     .getResourceAsStream("/com/sun/tools/hat/resources/platform_names.txt");

    64             if (str != null) {

    65                 try {

    66                     BufferedReader rdr

    67                         = new BufferedReader(new InputStreamReader(str));

    68                     for (;;) {

    69                         String s = rdr.readLine();

    70                         if (s == null) {

    71                             break;

    72                         } else if (s.length() > 0) {

    73                             list.add(s);

    74                         }

    75                     }

    76                     rdr.close();

    77                     str.close();

    78                 } catch (IOException ex) {

    79                     ex.printStackTrace();

    80                     // Shouldn't happen, and if it does, continuing

    81                     // is the right thing to do anyway.

    82                 }

    83             }

    84             names = list.toArray(new String[list.size()]);

    85         }

    86         return names;

    87     }

    88 

    89 

    90     public static boolean isPlatformClass(JavaClass clazz) {

    91         // all classes loaded by bootstrap loader are considered

    92         // platform classes. In addition, the older name based filtering

    93         // is also done for compatibility.

    94         if (clazz.isBootstrap()) {

    95             return true;

    96         }

    97 

    98         String name = clazz.getName();

    99         // skip even the array classes of the skipped classes.

   100         if (name.startsWith("[")) {

   101             int index = name.lastIndexOf('[');

   102             if (index != -1) {

   103                 if (name.charAt(index + 1) != 'L') {

   104                     // some primitive array.

   105                     return true;

   106                 }

   107                 // skip upto 'L' after the last '['.

   108                 name = name.substring(index + 2);

   109             }

   110         }

   111         String[] nms = getNames();

   112         for (int i = 0; i < nms.length; i++) {

   113             if (name.startsWith(nms[i])) {

   114                 return true;

   115             }

   116         }

   117         return false;

   118     }

   119 }