XPP3Reader xref

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    1   /*
    2    * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    3    *
    4    * This software is open source.
    5    * See the bottom of this file for the licence.
    6    */
    7
    8   package org.dom4j.io;
    9
    10  import java.io.BufferedReader;
    11  import java.io.CharArrayReader;
    12  import java.io.File;
    13  import java.io.FileReader;
    14  import java.io.IOException;
    15  import java.io.InputStream;
    16  import java.io.InputStreamReader;
    17  import java.io.Reader;
    18  import java.net.URL;
    19
    20  import org.dom4j.Document;
    21  import org.dom4j.DocumentException;
    22  import org.dom4j.DocumentFactory;
    23  import org.dom4j.Element;
    24  import org.dom4j.ElementHandler;
    25  import org.dom4j.QName;
    26
    27  import org.xmlpull.v1.XmlPullParser;
    28  import org.xmlpull.v1.XmlPullParserException;
    29  import org.xmlpull.v1.XmlPullParserFactory;
    30
    31  /***
    32   * <p>
    33   * <code>XPP3Reader</code> is a Reader of DOM4J documents that uses the fast
    34   * <a href="http://www.extreme.indiana.edu/soap/xpp/">XML Pull Parser 3.x </a>.
    35   * It is very fast for use in SOAP style environments.
    36   * </p>
    37   *
    38   * @author <a href="mailto:pelle@neubia.com">Pelle Braendgaard </a>
    39   * @author <a href="mailto:jstrachan@apache.org">James Strachan </a>
    40   * @version $Revision: 1.3 $
    41   */
    42  public class XPP3Reader {
    43      /*** <code>DocumentFactory</code> used to create new document objects */
    44      private DocumentFactory factory;
    45
    46      /*** <code>XmlPullParser</code> used to parse XML */
    47      private XmlPullParser xppParser;
    48
    49      /*** <code>XmlPullParser</code> used to parse XML */
    50      private XmlPullParserFactory xppFactory;
    51
    52      /*** DispatchHandler to call when each <code>Element</code> is encountered */
    53      private DispatchHandler dispatchHandler;
    54
    55      public XPP3Reader() {
    56      }
    57
    58      public XPP3Reader(DocumentFactory factory) {
    59          this.factory = factory;
    60      }
    61
    62      /***
    63       * <p>
    64       * Reads a Document from the given <code>File</code>
    65       * </p>
    66       *
    67       * @param file
    68       *            is the <code>File</code> to read from.
    69       *
    70       * @return the newly created Document instance
    71       *
    72       * @throws DocumentException
    73       *             if an error occurs during parsing.
    74       * @throws IOException
    75       *             if a URL could not be made for the given File
    76       * @throws XmlPullParserException
    77       *             DOCUMENT ME!
    78       */
    79      public Document read(File file) throws DocumentException, IOException,
    80              XmlPullParserException {
    81          String systemID = file.getAbsolutePath();
    82
    83          return read(new BufferedReader(new FileReader(file)), systemID);
    84      }
    85
    86      /***
    87       * <p>
    88       * Reads a Document from the given <code>URL</code>
    89       * </p>
    90       *
    91       * @param url
    92       *            <code>URL</code> to read from.
    93       *
    94       * @return the newly created Document instance
    95       *
    96       * @throws DocumentException
    97       *             if an error occurs during parsing.
    98       * @throws IOException
    99       *             DOCUMENT ME!
    100      * @throws XmlPullParserException
    101      *             DOCUMENT ME!
    102      */
    103     public Document read(URL url) throws DocumentException, IOException,
    104             XmlPullParserException {
    105         String systemID = url.toExternalForm();
    106
    107         return read(createReader(url.openStream()), systemID);
    108     }
    109
    110     /***
    111      * <p>
    112      * Reads a Document from the given URL or filename.
    113      * </p>
    114      *
    115      * <p>
    116      * If the systemID contains a <code>':'</code> character then it is
    117      * assumed to be a URL otherwise its assumed to be a file name. If you want
    118      * finer grained control over this mechansim then please explicitly pass in
    119      * either a {@link URL}or a {@link File}instance instead of a {@link
    120      * String} to denote the source of the document.
    121      * </p>
    122      *
    123      * @param systemID
    124      *            is a URL for a document or a file name.
    125      *
    126      * @return the newly created Document instance
    127      *
    128      * @throws DocumentException
    129      *             if an error occurs during parsing.
    130      * @throws IOException
    131      *             if a URL could not be made for the given File
    132      * @throws XmlPullParserException
    133      *             DOCUMENT ME!
    134      */
    135     public Document read(String systemID) throws DocumentException,
    136             IOException, XmlPullParserException {
    137         if (systemID.indexOf(':') >= 0) {
    138             // lets assume its a URL
    139             return read(new URL(systemID));
    140         } else {
    141             // lets assume that we are given a file name
    142             return read(new File(systemID));
    143         }
    144     }
    145
    146     /***
    147      * <p>
    148      * Reads a Document from the given stream
    149      * </p>
    150      *
    151      * @param in
    152      *            <code>InputStream</code> to read from.
    153      *
    154      * @return the newly created Document instance
    155      *
    156      * @throws DocumentException
    157      *             if an error occurs during parsing.
    158      * @throws IOException
    159      *             DOCUMENT ME!
    160      * @throws XmlPullParserException
    161      *             DOCUMENT ME!
    162      */
    163     public Document read(InputStream in) throws DocumentException, IOException,
    164             XmlPullParserException {
    165         return read(createReader(in));
    166     }
    167
    168     /***
    169      * <p>
    170      * Reads a Document from the given <code>Reader</code>
    171      * </p>
    172      *
    173      * @param reader
    174      *            is the reader for the input
    175      *
    176      * @return the newly created Document instance
    177      *
    178      * @throws DocumentException
    179      *             if an error occurs during parsing.
    180      * @throws IOException
    181      *             DOCUMENT ME!
    182      * @throws XmlPullParserException
    183      *             DOCUMENT ME!
    184      */
    185     public Document read(Reader reader) throws DocumentException, IOException,
    186             XmlPullParserException {
    187         getXPPParser().setInput(reader);
    188
    189         return parseDocument();
    190     }
    191
    192     /***
    193      * <p>
    194      * Reads a Document from the given array of characters
    195      * </p>
    196      *
    197      * @param text
    198      *            is the text to parse
    199      *
    200      * @return the newly created Document instance
    201      *
    202      * @throws DocumentException
    203      *             if an error occurs during parsing.
    204      * @throws IOException
    205      *             DOCUMENT ME!
    206      * @throws XmlPullParserException
    207      *             DOCUMENT ME!
    208      */
    209     public Document read(char[] text) throws DocumentException, IOException,
    210             XmlPullParserException {
    211         getXPPParser().setInput(new CharArrayReader(text));
    212
    213         return parseDocument();
    214     }
    215
    216     /***
    217      * <p>
    218      * Reads a Document from the given stream
    219      * </p>
    220      *
    221      * @param in
    222      *            <code>InputStream</code> to read from.
    223      * @param systemID
    224      *            is the URI for the input
    225      *
    226      * @return the newly created Document instance
    227      *
    228      * @throws DocumentException
    229      *             if an error occurs during parsing.
    230      * @throws IOException
    231      *             DOCUMENT ME!
    232      * @throws XmlPullParserException
    233      *             DOCUMENT ME!
    234      */
    235     public Document read(InputStream in, String systemID)
    236             throws DocumentException, IOException, XmlPullParserException {
    237         return read(createReader(in), systemID);
    238     }
    239
    240     /***
    241      * <p>
    242      * Reads a Document from the given <code>Reader</code>
    243      * </p>
    244      *
    245      * @param reader
    246      *            is the reader for the input
    247      * @param systemID
    248      *            is the URI for the input
    249      *
    250      * @return the newly created Document instance
    251      *
    252      * @throws DocumentException
    253      *             if an error occurs during parsing.
    254      * @throws IOException
    255      *             DOCUMENT ME!
    256      * @throws XmlPullParserException
    257      *             DOCUMENT ME!
    258      */
    259     public Document read(Reader reader, String systemID)
    260             throws DocumentException, IOException, XmlPullParserException {
    261         Document document = read(reader);
    262         document.setName(systemID);
    263
    264         return document;
    265     }
    266
    267     // Properties
    268     // -------------------------------------------------------------------------
    269     public XmlPullParser getXPPParser() throws XmlPullParserException {
    270         if (xppParser == null) {
    271             xppParser = getXPPFactory().newPullParser();
    272         }
    273
    274         return xppParser;
    275     }
    276
    277     public XmlPullParserFactory getXPPFactory() throws XmlPullParserException {
    278         if (xppFactory == null) {
    279             xppFactory = XmlPullParserFactory.newInstance();
    280         }
    281
    282         xppFactory.setNamespaceAware(true);
    283
    284         return xppFactory;
    285     }
    286
    287     public void setXPPFactory(XmlPullParserFactory xPPfactory) {
    288         this.xppFactory = xPPfactory;
    289     }
    290
    291     /***
    292      * DOCUMENT ME!
    293      *
    294      * @return the <code>DocumentFactory</code> used to create document
    295      *         objects
    296      */
    297     public DocumentFactory getDocumentFactory() {
    298         if (factory == null) {
    299             factory = DocumentFactory.getInstance();
    300         }
    301
    302         return factory;
    303     }
    304
    305     /***
    306      * <p>
    307      * This sets the <code>DocumentFactory</code> used to create new
    308      * documents. This method allows the building of custom DOM4J tree objects
    309      * to be implemented easily using a custom derivation of
    310      * {@link DocumentFactory}
    311      * </p>
    312      *
    313      * @param documentFactory
    314      *            <code>DocumentFactory</code> used to create DOM4J objects
    315      */
    316     public void setDocumentFactory(DocumentFactory documentFactory) {
    317         this.factory = documentFactory;
    318     }
    319
    320     /***
    321      * Adds the <code>ElementHandler</code> to be called when the specified
    322      * path is encounted.
    323      *
    324      * @param path
    325      *            is the path to be handled
    326      * @param handler
    327      *            is the <code>ElementHandler</code> to be called by the event
    328      *            based processor.
    329      */
    330     public void addHandler(String path, ElementHandler handler) {
    331         getDispatchHandler().addHandler(path, handler);
    332     }
    333
    334     /***
    335      * Removes the <code>ElementHandler</code> from the event based processor,
    336      * for the specified path.
    337      *
    338      * @param path
    339      *            is the path to remove the <code>ElementHandler</code> for.
    340      */
    341     public void removeHandler(String path) {
    342         getDispatchHandler().removeHandler(path);
    343     }
    344
    345     /***
    346      * When multiple <code>ElementHandler</code> instances have been
    347      * registered, this will set a default <code>ElementHandler</code> to be
    348      * called for any path which does <b>NOT </b> have a handler registered.
    349      *
    350      * @param handler
    351      *            is the <code>ElementHandler</code> to be called by the event
    352      *            based processor.
    353      */
    354     public void setDefaultHandler(ElementHandler handler) {
    355         getDispatchHandler().setDefaultHandler(handler);
    356     }
    357
    358     // Implementation methods
    359     // -------------------------------------------------------------------------
    360     protected Document parseDocument() throws DocumentException, IOException,
    361             XmlPullParserException {
    362         DocumentFactory df = getDocumentFactory();
    363         Document document = df.createDocument();
    364         Element parent = null;
    365         XmlPullParser pp = getXPPParser();
    366         pp.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, true);
    367
    368         while (true) {
    369             int type = pp.nextToken();
    370
    371             switch (type) {
    372                 case XmlPullParser.PROCESSING_INSTRUCTION: {
    373                     String text = pp.getText();
    374                     int loc = text.indexOf(" ");
    375
    376                     if (loc >= 0) {
    377                         String target = text.substring(0, loc);
    378                         String txt = text.substring(loc + 1);
    379                         document.addProcessingInstruction(target, txt);
    380                     } else {
    381                         document.addProcessingInstruction(text, "");
    382                     }
    383
    384                     break;
    385                 }
    386
    387                 case XmlPullParser.COMMENT: {
    388                     if (parent != null) {
    389                         parent.addComment(pp.getText());
    390                     } else {
    391                         document.addComment(pp.getText());
    392                     }
    393
    394                     break;
    395                 }
    396
    397                 case XmlPullParser.CDSECT: {
    398                     if (parent != null) {
    399                         parent.addCDATA(pp.getText());
    400                     } else {
    401                         String msg = "Cannot have text content outside of the "
    402                                 + "root document";
    403                         throw new DocumentException(msg);
    404                     }
    405
    406                     break;
    407                 }
    408
    409                 case XmlPullParser.ENTITY_REF:
    410                     break;
    411
    412                 case XmlPullParser.END_DOCUMENT:
    413                     return document;
    414
    415                 case XmlPullParser.START_TAG: {
    416                     QName qname = (pp.getPrefix() == null) ? df.createQName(pp
    417                             .getName(), pp.getNamespace()) : df.createQName(pp
    418                             .getName(), pp.getPrefix(), pp.getNamespace());
    419                     Element newElement = df.createElement(qname);
    420                     int nsStart = pp.getNamespaceCount(pp.getDepth() - 1);
    421                     int nsEnd = pp.getNamespaceCount(pp.getDepth());
    422
    423                     for (int i = nsStart; i < nsEnd; i++) {
    424                         if (pp.getNamespacePrefix(i) != null) {
    425                             newElement.addNamespace(pp.getNamespacePrefix(i),
    426                                     pp.getNamespaceUri(i));
    427                         }
    428                     }
    429
    430                     for (int i = 0; i < pp.getAttributeCount(); i++) {
    431                         QName qa = (pp.getAttributePrefix(i) == null) ? df
    432                                 .createQName(pp.getAttributeName(i)) : df
    433                                 .createQName(pp.getAttributeName(i), pp
    434                                         .getAttributePrefix(i), pp
    435                                         .getAttributeNamespace(i));
    436                         newElement.addAttribute(qa, pp.getAttributeValue(i));
    437                     }
    438
    439                     if (parent != null) {
    440                         parent.add(newElement);
    441                     } else {
    442                         document.add(newElement);
    443                     }
    444
    445                     parent = newElement;
    446
    447                     break;
    448                 }
    449
    450                 case XmlPullParser.END_TAG: {
    451                     if (parent != null) {
    452                         parent = parent.getParent();
    453                     }
    454
    455                     break;
    456                 }
    457
    458                 case XmlPullParser.TEXT: {
    459                     String text = pp.getText();
    460
    461                     if (parent != null) {
    462                         parent.addText(text);
    463                     } else {
    464                         String msg = "Cannot have text content outside of the "
    465                                 + "root document";
    466                         throw new DocumentException(msg);
    467                     }
    468
    469                     break;
    470                 }
    471
    472                 default:
    473                     break;
    474             }
    475         }
    476     }
    477
    478     protected DispatchHandler getDispatchHandler() {
    479         if (dispatchHandler == null) {
    480             dispatchHandler = new DispatchHandler();
    481         }
    482
    483         return dispatchHandler;
    484     }
    485
    486     protected void setDispatchHandler(DispatchHandler dispatchHandler) {
    487         this.dispatchHandler = dispatchHandler;
    488     }
    489
    490     /***
    491      * Factory method to create a Reader from the given InputStream.
    492      *
    493      * @param in
    494      *            DOCUMENT ME!
    495      *
    496      * @return DOCUMENT ME!
    497      *
    498      * @throws IOException
    499      *             DOCUMENT ME!
    500      */
    501     protected Reader createReader(InputStream in) throws IOException {
    502         return new BufferedReader(new InputStreamReader(in));
    503     }
    504 }
    505
    506 /*
    507  * Redistribution and use of this software and associated documentation
    508  * ("Software"), with or without modification, are permitted provided that the
    509  * following conditions are met:
    510  *
    511  * 1. Redistributions of source code must retain copyright statements and
    512  * notices. Redistributions must also contain a copy of this document.
    513  *
    514  * 2. Redistributions in binary form must reproduce the above copyright notice,
    515  * this list of conditions and the following disclaimer in the documentation
    516  * and/or other materials provided with the distribution.
    517  *
    518  * 3. The name "DOM4J" must not be used to endorse or promote products derived
    519  * from this Software without prior written permission of MetaStuff, Ltd. For
    520  * written permission, please contact dom4j-info@metastuff.com.
    521  *
    522  * 4. Products derived from this Software may not be called "DOM4J" nor may
    523  * "DOM4J" appear in their names without prior written permission of MetaStuff,
    524  * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
    525  *
    526  * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
    527  *
    528  * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
    529  * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    530  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    531  * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
    532  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    533  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    534  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    535  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    536  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    537  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    538  * POSSIBILITY OF SUCH DAMAGE.
    539  *
    540  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    541  */