Caldavsync Sources: src/net/fortuna/ical4j/data/CalendarParserImpl.java@fb9019fb1bf7 (annotated)

src/net/fortuna/ical4j/data/CalendarParserImpl.java@fb9019fb1bf7 (annotated)

src/net/fortuna/ical4j/data/CalendarParserImpl.java

Tue, 10 Feb 2015 18:12:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 10 Feb 2015 18:12:00 +0100
changeset 0: fb9019fb1bf7
child 3: 73bdfa70b04e
permissions: -rw-r--r--

Import initial revisions of existing project AndroidCaldavSyncAdapater,
forked from upstream repository at 27e8a0f8495c92e0780d450bdf0c7cec77a03a55.

 /**
  * Copyright (c) 2012, Ben Fortuna
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *  o Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *
  *  o Redistributions in binary form must reproduce the above copyright
  * notice, this list of conditions and the following disclaimer in the
  * documentation and/or other materials provided with the distribution.
  *
  *  o Neither the name of Ben Fortuna nor the names of any other contributors
  * may be used to endorse or promote products derived from this software
  * without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 package net.fortuna.ical4j.data;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.Reader;
 import java.io.StreamTokenizer;
 import java.net.URISyntaxException;
 import java.text.MessageFormat;
 import java.text.ParseException;
 import net.fortuna.ical4j.model.Calendar;
 import net.fortuna.ical4j.model.Component;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 /**
  * <pre>
  * $Id$
  *
  *  Created [Nov 5, 2004]
  * </pre>
  *
  * The default implementation of a calendar parser.
  * @author Ben Fortuna
  */
 public class CalendarParserImpl implements CalendarParser {
     private static final int WORD_CHAR_START = 32;
     private static final int WORD_CHAR_END = 255;
     private static final int WHITESPACE_CHAR_START = 0;
     private static final int WHITESPACE_CHAR_END = 20;
     private static final String UNEXPECTED_TOKEN_MESSAGE = "Expected [{0}], read [{1}]";
     private Log log = LogFactory.getLog(CalendarParserImpl.class);
     private final ComponentListParser componentListParser = new ComponentListParser();
     private final ComponentParser componentParser = new ComponentParser();
     private final PropertyListParser propertyListParser = new PropertyListParser();
     private final PropertyParser propertyParser = new PropertyParser();
     private final ParameterListParser paramListParser = new ParameterListParser();
     private final ParameterParser paramParser = new ParameterParser();
     /**
      * {@inheritDoc}
      */
     public final void parse(final InputStream in, final ContentHandler handler)
             throws IOException, ParserException {
         parse(new InputStreamReader(in), handler);
     }
     /**
      * {@inheritDoc}
      */
     public final void parse(final Reader in, final ContentHandler handler)
             throws IOException, ParserException {
         final StreamTokenizer tokeniser = new StreamTokenizer(in);
         try {
             tokeniser.resetSyntax();
             tokeniser.wordChars(WORD_CHAR_START, WORD_CHAR_END);
             tokeniser.whitespaceChars(WHITESPACE_CHAR_START,
                     WHITESPACE_CHAR_END);
             tokeniser.ordinaryChar(':');
             tokeniser.ordinaryChar(';');
             tokeniser.ordinaryChar('=');
             tokeniser.ordinaryChar('\t');
             tokeniser.eolIsSignificant(true);
             tokeniser.whitespaceChars(0, 0);
             tokeniser.quoteChar('"');
             // BEGIN:VCALENDAR
             assertToken(tokeniser, in, Calendar.BEGIN);
             assertToken(tokeniser, in, ':');
             assertToken(tokeniser, in, Calendar.VCALENDAR, true);
             assertToken(tokeniser, in, StreamTokenizer.TT_EOL);
             handler.startCalendar();
             // parse calendar properties..
             propertyListParser.parse(tokeniser, in, handler);
             // parse components..
             componentListParser.parse(tokeniser, in, handler);
             // END:VCALENDAR
             // assertToken(tokeniser,Calendar.END);
             assertToken(tokeniser, in, ':');
             assertToken(tokeniser, in, Calendar.VCALENDAR, true);
             handler.endCalendar();
         }
         catch (Exception e) {
             if (e instanceof IOException) {
                 throw (IOException) e;
             }
             if (e instanceof ParserException) {
                 throw (ParserException) e;
             }
             else {
                 throw new ParserException(e.getMessage(), getLineNumber(tokeniser, in), e);
             }
         }
     }
     /**
      * Parses an iCalendar property list from the specified stream tokeniser.
      * @param tokeniser
      * @throws IOException
      * @throws ParseException
      * @throws URISyntaxException
      * @throws URISyntaxException
      * @throws ParserException
      */
     private class PropertyListParser {
         public void parse(final StreamTokenizer tokeniser, Reader in,
                 final ContentHandler handler) throws IOException, ParseException,
                 URISyntaxException, ParserException {
             assertToken(tokeniser, in, StreamTokenizer.TT_WORD);
             while (/*
                      * !Component.BEGIN.equals(tokeniser.sval) &&
                      */!Component.END.equals(tokeniser.sval)) {
                 // check for timezones observances or vevent/vtodo alarms..
                 if (Component.BEGIN.equals(tokeniser.sval)) {
                     componentParser.parse(tokeniser, in, handler);
                 }
                 else {
                     propertyParser.parse(tokeniser, in, handler);
                 }
                 absorbWhitespace(tokeniser);
                 // assertToken(tokeniser, StreamTokenizer.TT_WORD);
             }
         }
     }
     /**
      * Parses an iCalendar property from the specified stream tokeniser.
      * @param tokeniser
      * @throws IOException
      * @throws ParserException
      * @throws URISyntaxException
      * @throws ParseException
      */
     private class PropertyParser {
         private static final String PARSE_DEBUG_MESSAGE = "Property [{0}]";
         private static final String PARSE_EXCEPTION_MESSAGE = "Property [{0}]";
         private void parse(final StreamTokenizer tokeniser, Reader in,
                 final ContentHandler handler) throws IOException, ParserException,
                 URISyntaxException, ParseException {
             final String name = tokeniser.sval;
             // debugging..
             if (log.isDebugEnabled()) {
                 log.debug(MessageFormat.format(PARSE_DEBUG_MESSAGE, new Object[] {name}));
             }
             handler.startProperty(name);
             paramListParser.parse(tokeniser, in, handler);
             // it appears that control tokens (ie. ':') are allowed
             // after the first instance on a line is used.. as such
             // we must continue appending to value until EOL is
             // reached..
             // assertToken(tokeniser, StreamTokenizer.TT_WORD);
             // String value = tokeniser.sval;
             final StringBuffer value = new StringBuffer();
             // assertToken(tokeniser,StreamTokenizer.TT_EOL);
             // DQUOTE is ordinary char for property value
             // From sec 4.3.11 of rfc-2445:
             // text       = *(TSAFE-CHAR / ":" / DQUOTE / ESCAPED-CHAR)
             //
             tokeniser.ordinaryChar('"');
             int nextToken = tokeniser.nextToken();
             while (nextToken != StreamTokenizer.TT_EOL
                     && nextToken != StreamTokenizer.TT_EOF) {
                 if (tokeniser.ttype == StreamTokenizer.TT_WORD) {
                     value.append(tokeniser.sval);
                 }
                 else {
                     value.append((char) tokeniser.ttype);
                 }
                 nextToken = tokeniser.nextToken();
             }
             // reset DQUOTE to be quote char
             tokeniser.quoteChar('"');
             if (nextToken == StreamTokenizer.TT_EOF) {
                 throw new ParserException("Unexpected end of file",
                         getLineNumber(tokeniser, in));
             }
             try {
                 handler.propertyValue(value.toString());
             }
             catch (ParseException e) {
                 final ParseException eNew = new ParseException("[" + name + "] "
                         + e.getMessage(), e.getErrorOffset());
                 eNew.initCause(e);
                 throw eNew;
             }
             handler.endProperty(name);
         }
     }
     /**
      * Parses a list of iCalendar parameters by parsing the specified stream tokeniser.
      * @param tokeniser
      * @throws IOException
      * @throws ParserException
      * @throws URISyntaxException
      */
     private class ParameterListParser {
         public void parse(final StreamTokenizer tokeniser, Reader in,
                 final ContentHandler handler) throws IOException, ParserException,
                 URISyntaxException {
             while (tokeniser.nextToken() == ';') {
                 paramParser.parse(tokeniser, in, handler);
             }
         }
     }
     /**
      * @param tokeniser
      * @param handler
      * @throws IOException
      * @throws ParserException
      * @throws URISyntaxException
      */
     private class ParameterParser {
         private void parse(final StreamTokenizer tokeniser, Reader in,
                 final ContentHandler handler) throws IOException, ParserException,
                 URISyntaxException {
             assertToken(tokeniser, in, StreamTokenizer.TT_WORD);
             final String paramName = tokeniser.sval;
             // debugging..
             if (log.isDebugEnabled()) {
                 log.debug("Parameter [" + paramName + "]");
             }
             assertToken(tokeniser, in, '=');
             final StringBuffer paramValue = new StringBuffer();
             // preserve quote chars..
             if (tokeniser.nextToken() == '"') {
                 paramValue.append('"');
                 paramValue.append(tokeniser.sval);
                 paramValue.append('"');
             }
             else if (tokeniser.sval != null) {
                 paramValue.append(tokeniser.sval);
                 // check for additional words to account for equals (=) in param-value
                 int nextToken = tokeniser.nextToken();
                 while (nextToken != ';' && nextToken != ':' && nextToken != ',') {
                     if (tokeniser.ttype == StreamTokenizer.TT_WORD) {
                         paramValue.append(tokeniser.sval);
                     }
                     else {
                     	paramValue.append((char) tokeniser.ttype);
                     }
                     nextToken = tokeniser.nextToken();
                 }
                 tokeniser.pushBack();
             } else if(tokeniser.sval == null) {
             	tokeniser.pushBack();
             }
             try {
                 handler.parameter(paramName, paramValue.toString());
             }
             catch (ClassCastException cce) {
                 throw new ParserException("Error parsing parameter", getLineNumber(tokeniser, in), cce);
             }
         }
     }
     /**
      * Parses an iCalendar component list from the specified stream tokeniser.
      * @param tokeniser
      * @throws IOException
      * @throws ParseException
      * @throws URISyntaxException
      * @throws ParserException
      */
     private class ComponentListParser {
         private void parse(final StreamTokenizer tokeniser, Reader in,
                 final ContentHandler handler) throws IOException, ParseException,
                 URISyntaxException, ParserException {
             while (Component.BEGIN.equals(tokeniser.sval)) {
                 componentParser.parse(tokeniser, in, handler);
                 absorbWhitespace(tokeniser);
                 // assertToken(tokeniser, StreamTokenizer.TT_WORD);
             }
         }
     }
     /**
      * Parses an iCalendar component from the specified stream tokeniser.
      * @param tokeniser
      * @throws IOException
      * @throws ParseException
      * @throws URISyntaxException
      * @throws ParserException
      */
     private class ComponentParser {
         private void parse(final StreamTokenizer tokeniser, Reader in,
                 final ContentHandler handler) throws IOException, ParseException,
                 URISyntaxException, ParserException {
             assertToken(tokeniser, in, ':');
             assertToken(tokeniser, in, StreamTokenizer.TT_WORD);
             final String name = tokeniser.sval;
             handler.startComponent(name);
             assertToken(tokeniser, in, StreamTokenizer.TT_EOL);
             propertyListParser.parse(tokeniser, in, handler);
             /*
              * // a special case for VTIMEZONE component which contains
              * // sub-components..
              * if (Component.VTIMEZONE.equals(name)) {
              *     parseComponentList(tokeniser, handler);
              * }
              * // VEVENT/VTODO components may optionally have embedded VALARM
              * // components..
              * else if ((Component.VEVENT.equals(name) || Component.VTODO.equals(name))
              *         &amp;&amp; Component.BEGIN.equals(tokeniser.sval)) {
              *     parseComponentList(tokeniser, handler);
              * }
              */
             assertToken(tokeniser, in, ':');
             assertToken(tokeniser, in, name);
             assertToken(tokeniser, in, StreamTokenizer.TT_EOL);
             handler.endComponent(name);
         }
     }
     /**
      * Asserts that the next token in the stream matches the specified token.
      * @param tokeniser stream tokeniser to perform assertion on
      * @param token expected token
      * @throws IOException when unable to read from stream
      * @throws ParserException when next token in the stream does not match the expected token
      */
     private void assertToken(final StreamTokenizer tokeniser, Reader in, final int token)
             throws IOException, ParserException {
         if (tokeniser.nextToken() != token) {
             throw new ParserException(MessageFormat.format(UNEXPECTED_TOKEN_MESSAGE, new Object[] {
                     new Integer(token), new Integer(tokeniser.ttype),
             }), getLineNumber(tokeniser, in));
         }
         if (log.isDebugEnabled()) {
             log.debug("[" + token + "]");
         }
     }
     /**
      * Asserts that the next token in the stream matches the specified token. This method is case-sensitive.
      * @param tokeniser
      * @param token
      * @throws IOException
      * @throws ParserException
      */
     private void assertToken(final StreamTokenizer tokeniser, Reader in, final String token)
             throws IOException, ParserException {
         assertToken(tokeniser, in, token, false);
     }
     /**
      * Asserts that the next token in the stream matches the specified token.
      * @param tokeniser stream tokeniser to perform assertion on
      * @param token expected token
      * @throws IOException when unable to read from stream
      * @throws ParserException when next token in the stream does not match the expected token
      */
     private void assertToken(final StreamTokenizer tokeniser, Reader in,
             final String token, final boolean ignoreCase) throws IOException,
             ParserException {
         // ensure next token is a word token..
         assertToken(tokeniser, in, StreamTokenizer.TT_WORD);
         if (ignoreCase) {
             if (!token.equalsIgnoreCase(tokeniser.sval)) {
                 throw new ParserException(MessageFormat.format(UNEXPECTED_TOKEN_MESSAGE, new Object[] {
                         token, tokeniser.sval,
                 }), getLineNumber(tokeniser, in));
             }
         }
         else if (!token.equals(tokeniser.sval)) {
             throw new ParserException(MessageFormat.format(UNEXPECTED_TOKEN_MESSAGE, new Object[] {
                     token, tokeniser.sval,
             }), getLineNumber(tokeniser, in));
         }
         if (log.isDebugEnabled()) {
             log.debug("[" + token + "]");
         }
     }
     /**
      * Absorbs extraneous newlines.
      * @param tokeniser
      * @throws IOException
      */
     private void absorbWhitespace(final StreamTokenizer tokeniser) throws IOException {
         // HACK: absorb extraneous whitespace between components (KOrganizer)..
         while (tokeniser.nextToken() == StreamTokenizer.TT_EOL) {
             if (log.isTraceEnabled()) {
                 log.trace("Absorbing extra whitespace..");
             }
         }
         if (log.isTraceEnabled()) {
             log.trace("Aborting: absorbing extra whitespace complete");
         }
     }
     /**
      * @param tokeniser
      * @param in
      * @return
      */
     private int getLineNumber(StreamTokenizer tokeniser, Reader in) {
         int line = tokeniser.lineno();
         if (tokeniser.ttype == StreamTokenizer.TT_EOL) {
             line -= 1;
         }
         if (in instanceof UnfoldingReader) {
             // need to take unfolded lines into account
             final int unfolded = ((UnfoldingReader) in).getLinesUnfolded();
             line += unfolded;
         }
         return line;
     }
 }

Caldavsync Sources / annotate

src/net/fortuna/ical4j/data/CalendarParserImpl.java@fb9019fb1bf7 (annotated)

src/net/fortuna/ical4j/data/CalendarParserImpl.java