1 /*

     2  * Copyright (c) 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  */

    25 package com.sun.tools.jdeps;

    26 

    27 import java.io.IOException;

    28 import java.io.InputStream;

    29 import java.util.HashSet;

    30 import java.util.Set;

    31 import javax.xml.namespace.QName;

    32 import javax.xml.stream.XMLEventReader;

    33 import javax.xml.stream.XMLInputFactory;

    34 import javax.xml.stream.XMLStreamException;

    35 import javax.xml.stream.events.Attribute;

    36 import javax.xml.stream.events.XMLEvent;

    37 import com.sun.tools.jdeps.ClassFileReader.ModuleClassReader;

    38 import com.sun.tools.jdeps.PlatformClassPath.ImageHelper;

    39 

    40 final class ModulesXmlReader {

    41     public static Set<Module> load(ImageHelper helper,InputStream in)

    42         throws IOException

    43     {

    44         try {

    45             ModulesXmlReader reader = new ModulesXmlReader(helper);

    46             return reader.load(in);

    47         } catch (XMLStreamException e) {

    48             throw new RuntimeException(e);

    49         }

    50     }

    51 

    52     private static final String MODULES   = "modules";

    53     private static final String MODULE    = "module";

    54     private static final String NAME      = "name";

    55     private static final String DEPEND    = "depend";

    56     private static final String EXPORT    = "export";

    57     private static final String TO        = "to";

    58     private static final QName  REEXPORTS = new QName("re-exports");

    59     private final ImageHelper helper;

    60     ModulesXmlReader(ImageHelper helper) {

    61         this.helper = helper;

    62     }

    63 

    64     public Set<Module> load(InputStream in) throws XMLStreamException, IOException {

    65         Set<Module> modules = new HashSet<>();

    66         if (in == null) {

    67             throw new RuntimeException("jdeps-modules.xml doesn't exist");

    68         }

    69         XMLInputFactory factory = XMLInputFactory.newInstance();

    70         XMLEventReader reader = factory.createXMLEventReader(in, "UTF-8");

    71         Module.Builder mb = null;

    72         String modulename = null;

    73         String exportedPackage = null;

    74         Set<String> permits = new HashSet<>();

    75         while (reader.hasNext()) {

    76             XMLEvent event = reader.nextEvent();

    77             if (event.isStartElement()) {

    78                 String startTag = event.asStartElement().getName().getLocalPart();

    79                 switch (startTag) {

    80                     case MODULES:

    81                         break;

    82                     case MODULE:

    83                         if (mb != null) {

    84                             throw new RuntimeException("end tag for module is missing");

    85                         }

    86                         modulename = getNextTag(reader, NAME);

    87                         mb = new Module.Builder();

    88                         mb.name(modulename);

    89                         break;

    90                     case NAME:

    91                         throw new RuntimeException(event.toString());

    92                     case DEPEND:

    93                         boolean reexports = false;

    94                         Attribute attr = event.asStartElement().getAttributeByName(REEXPORTS);

    95                         if (attr != null) {

    96                             String value = attr.getValue();

    97                             if (value.equals("true") || value.equals("false")) {

    98                                 reexports = Boolean.parseBoolean(value);

    99                             } else {

   100                                 throw new RuntimeException("unexpected attribute " + attr.toString());

   101                             }

   102                         }

   103                         mb.require(getData(reader), reexports);

   104                         break;

   105                     case EXPORT:

   106                         exportedPackage = getNextTag(reader, NAME);

   107                         break;

   108                     case TO:

   109                         permits.add(getData(reader));

   110                         break;

   111                     default:

   112                         throw new RuntimeException("invalid element: " + event);

   113                 }

   114             } else if (event.isEndElement()) {

   115                 String endTag = event.asEndElement().getName().getLocalPart();

   116                 switch (endTag) {

   117                     case MODULE:

   118                         ModuleClassReader cfr = helper.getModuleClassReader(modulename);

   119                         mb.classes(cfr);

   120                         mb.packages(cfr.packages());

   121                         modules.add(mb.build());

   122                         mb = null;

   123                         break;

   124                     case EXPORT:

   125                         if (exportedPackage == null) {

   126                             throw new RuntimeException("export's name is missing");

   127                         }

   128                         mb.export(exportedPackage, permits);

   129                         exportedPackage = null;

   130                         permits.clear();

   131                         break;

   132                     default:

   133                 }

   134             } else if (event.isCharacters()) {

   135                 String s = event.asCharacters().getData();

   136                 if (!s.trim().isEmpty()) {

   137                     throw new RuntimeException("export-to is malformed");

   138                 }

   139             }

   140         }

   141         return modules;

   142     }

   143     private String getData(XMLEventReader reader) throws XMLStreamException {

   144         XMLEvent e = reader.nextEvent();

   145         if (e.isCharacters()) {

   146             return e.asCharacters().getData();

   147         }

   148         throw new RuntimeException(e.toString());

   149     }

   150 

   151     private String getNextTag(XMLEventReader reader, String tag) throws XMLStreamException {

   152         XMLEvent e = reader.nextTag();

   153         if (e.isStartElement()) {

   154             String t = e.asStartElement().getName().getLocalPart();

   155             if (!tag.equals(t)) {

   156                 throw new RuntimeException(e + " expected: " + tag);

   157             }

   158             return getData(reader);

   159         }

   160         throw new RuntimeException("export-to name is missing:" + e);

   161     }

   162 }