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

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

src/net/fortuna/ical4j/data/UnfoldingReader.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
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.PushbackReader;
 import java.io.Reader;
 import java.util.Arrays;
 import net.fortuna.ical4j.util.CompatibilityHints;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 /**
  * <pre>
  * $Id$ [06-Apr-2004]
  * </pre>
  *
  * A reader which performs iCalendar unfolding as it reads. Note that unfolding rules may be "relaxed" to allow
  * unfolding of non-conformant *.ics files. By specifying the system property "ical4j.unfolding.relaxed=true" iCalendar
  * files created with Mozilla Calendar/Sunbird may be correctly unfolded.
  *
  * To wrap this reader with a {@link java.io.BufferedReader} you must ensure you specify an identical buffer size
  * to that used in the {@link java.io.BufferedReader}.
  *
  * @author Ben Fortuna
  */
 public class UnfoldingReader extends PushbackReader {
     private Log log = LogFactory.getLog(UnfoldingReader.class);
     /**
      * The pattern used to identify a fold in an iCalendar data stream.
      */
     private static final char[] DEFAULT_FOLD_PATTERN_1 = { '\r', '\n', ' ' };
     /**
      * The pattern used to identify a fold in Microsoft Outlook 2007.
      */
     private static final char[] DEFAULT_FOLD_PATTERN_2 = { '\r', '\n', '\t' };
     /**
      * The pattern used to identify a fold in Mozilla Calendar/Sunbird and KOrganizer.
      */
     private static final char[] RELAXED_FOLD_PATTERN_1 = { '\n', ' ' };
     /**
      * The pattern used to identify a fold in Microsoft Outlook 2007.
      */
     private static final char[] RELAXED_FOLD_PATTERN_2 = { '\n', '\t' };
     private char[][] patterns;
     private char[][] buffers;
     private int linesUnfolded;
     private int maxPatternLength = 0;
     /**
      * Creates a new unfolding reader instance. Relaxed unfolding flag is read from system property.
      * @param in the reader to unfold from
      */
     public UnfoldingReader(final Reader in) {
         this(in, DEFAULT_FOLD_PATTERN_1.length, CompatibilityHints
                 .isHintEnabled(CompatibilityHints.KEY_RELAXED_UNFOLDING));
     }
     /**
      * @param in reader source for data
      * @param size the buffer size
      */
     public UnfoldingReader(final Reader in, int size) {
         this(in, size, CompatibilityHints.isHintEnabled(CompatibilityHints.KEY_RELAXED_UNFOLDING));
     }
     /**
      * @param in reader source for data
      * @param relaxed indicates whether relaxed unfolding is enabled
      */
     public UnfoldingReader(final Reader in, boolean relaxed) {
         this(in, DEFAULT_FOLD_PATTERN_1.length, relaxed);
     }
     /**
      * Creates a new unfolding reader instance.
      * @param in a reader to read from
      * @param size the buffer size
      * @param relaxed specifies whether unfolding is relaxed
      */
     public UnfoldingReader(final Reader in, int size, final boolean relaxed) {
         super(in, size);
         if (relaxed) {
             patterns = new char[4][];
             patterns[0] = DEFAULT_FOLD_PATTERN_1;
             patterns[1] = DEFAULT_FOLD_PATTERN_2;
             patterns[2] = RELAXED_FOLD_PATTERN_1;
             patterns[3] = RELAXED_FOLD_PATTERN_2;
         }
         else {
             patterns = new char[2][];
             patterns[0] = DEFAULT_FOLD_PATTERN_1;
             patterns[1] = DEFAULT_FOLD_PATTERN_2;
         }
         buffers = new char[patterns.length][];
         for (int i = 0; i < patterns.length; i++) {
             buffers[i] = new char[patterns[i].length];
             maxPatternLength = Math.max(maxPatternLength, patterns[i].length);
         }
     }
     /**
      * @return number of lines unfolded so far while reading
      */
     public final int getLinesUnfolded() {
         return linesUnfolded;
     }
     /**
      * {@inheritDoc}
      */
     public final int read() throws IOException {
         final int c = super.read();
         boolean doUnfold = false;
         for (int i = 0; i < patterns.length; i++) {
             if (c == patterns[i][0]) {
                 doUnfold = true;
                 break;
             }
         }
         if (!doUnfold) {
             return c;
         }
         else {
             unread(c);
         }
         unfold();
         return super.read();
     }
     /**
      * {@inheritDoc}
      */
     public int read(final char[] cbuf, final int off, final int len) throws IOException {
         final int read = super.read(cbuf, off, len);
         boolean doUnfold = false;
         for (int i = 0; i < patterns.length; i++) {
             if (read > 0 && cbuf[0] == patterns[i][0]) {
                 doUnfold = true;
                 break;
             }
             else {
                 for (int j = 0; j < read; j++) {
                     if (cbuf[j] == patterns[i][0]) {
                         unread(cbuf, j, read - j);
                         return j;
                     }
                 }
             }
         }
         if (!doUnfold) {
             return read;
         }
         else {
             unread(cbuf, off, read);
         }
         unfold();
         return super.read(cbuf, off, maxPatternLength);
     }
     private void unfold() throws IOException {
         // need to loop since one line fold might be directly followed by another
         boolean didUnfold;
         do {
             didUnfold = false;
             for (int i = 0; i < buffers.length; i++) {
                 int read = 0;
                 while (read < buffers[i].length) {
                     final int partialRead = super.read(buffers[i], read, buffers[i].length - read);
                     if (partialRead < 0) {
                         break;
                     }
                     read += partialRead;
                 }
                 if (read > 0) {
                     if (!Arrays.equals(patterns[i], buffers[i])) {
                         unread(buffers[i], 0, read);
                     }
                     else {
                         if (log.isTraceEnabled()) {
                             log.trace("Unfolding...");
                         }
                         linesUnfolded++;
                         didUnfold = true;
                     }
                 }
 //                else {
 //                    return read;
 //                }
             }
         }
         while (didUnfold);
     }
 }

Caldavsync Sources / annotate

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

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