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 

    26 package build.tools.module;

    27 

    28 import javax.xml.namespace.QName;

    29 import javax.xml.stream.XMLEventReader;

    30 import javax.xml.stream.XMLInputFactory;

    31 import javax.xml.stream.XMLStreamException;

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

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

    34 import java.io.BufferedInputStream;

    35 import java.io.IOException;

    36 import java.io.InputStream;

    37 import java.nio.file.Files;

    38 import java.nio.file.Path;

    39 import java.util.HashSet;

    40 import java.util.Set;

    41 

    42 public class ModulesXmlReader {

    43 

    44     private ModulesXmlReader() {}

    45 

    46     public static Set<Module> readModules(Path modulesXml)

    47         throws XMLStreamException, IOException

    48     {

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

    50         try (InputStream in = new BufferedInputStream(Files.newInputStream(modulesXml))) {

    51             Set<Module> mods = ModulesXmlReader.load(in);

    52             modules.addAll(mods);

    53         }

    54         return modules;

    55     }

    56 

    57     private static final String MODULES   = "modules";

    58     private static final String MODULE    = "module";

    59     private static final String NAME      = "name";

    60     private static final String DEPEND    = "depend";

    61     private static final String EXPORT    = "export";

    62     private static final String TO        = "to";

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

    64     private static Set<Module> load(InputStream in)

    65         throws XMLStreamException, IOException

    66     {

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

    68         XMLInputFactory factory = XMLInputFactory.newInstance();

    69         XMLEventReader stream = factory.createXMLEventReader(in);

    70         Module.Builder mb = null;

    71         String modulename = null;

    72         String pkg = null;

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

    74         while (stream.hasNext()) {

    75             XMLEvent event = stream.nextEvent();

    76             if (event.isStartElement()) {

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

    78                 switch (startTag) {

    79                     case MODULES:

    80                         break;

    81                     case MODULE:

    82                         if (mb != null) {

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

    84                         }

    85                         modulename = getNextTag(stream, NAME);

    86                         mb = new Module.Builder();

    87                         mb.name(modulename);

    88                         break;

    89                     case NAME:

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

    91                     case DEPEND:

    92                         boolean reexports = false;

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

    94                         if (attr != null) {

    95                             String value = attr.getValue();

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

    97                                 reexports = Boolean.parseBoolean(value);

    98                             } else {

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

   100                             }

   101                         }

   102                         mb.require(getData(stream), reexports);

   103                         break;

   104                     case EXPORT:

   105                         pkg = getNextTag(stream, NAME);

   106                         break;

   107                     case TO:

   108                         permits.add(getData(stream));

   109                         break;

   110                     default:

   111                 }

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

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

   114                 switch (endTag) {

   115                     case MODULE:

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

   117                         mb = null;

   118                         break;

   119                     case EXPORT:

   120                         if (pkg == null) {

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

   122                         }

   123                         mb.exportTo(pkg, permits);

   124                         pkg = null;

   125                         permits.clear();

   126                         break;

   127                     default:

   128                 }

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

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

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

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

   133                 }

   134             }

   135         }

   136         return modules;

   137     }

   138 

   139     private static String getData(XMLEventReader reader)

   140         throws XMLStreamException

   141     {

   142         XMLEvent e = reader.nextEvent();

   143         if (e.isCharacters())

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

   145 

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

   147     }

   148 

   149     private static String getNextTag(XMLEventReader reader, String tag)

   150         throws XMLStreamException

   151     {

   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 }