archive/net.sourceforge.phpeclipse.news/src/net/sourceforge/phpeclipse/news/Item.java

   1 package net.sourceforge.phpeclipse.news;
   2
   3 import java.text.DateFormat;
   4 import java.text.SimpleDateFormat;
   5 import java.util.Calendar;
   6 import java.util.Date;
   7 import java.util.GregorianCalendar;
   8 import java.util.Locale;
   9
  10 import org.eclipse.swt.SWT;
  11 import org.eclipse.swt.widgets.Table;
  12 import org.eclipse.swt.widgets.TableItem;
  13 import org.w3c.dom.Element;
  14 import org.w3c.dom.Node;
  15 import org.w3c.dom.NodeList;
  16 import org.w3c.dom.Text;
  17
  18 /**
  19  * @author jnegre - http://www.jnegre.org/
  20  *
  21  * (c)Copyright 2002 Jérôme Nègre
  22  *
  23  */
  24 public class Item {
  25
  26     protected static DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.SHORT,DateFormat.SHORT);
  27     protected static SimpleDateFormat pubDateParser = new SimpleDateFormat("EEE, d MMM yy hh:mm:ss z", new Locale("en","US"));
  28
  29     protected Channel channel;
  30
  31     protected String title;
  32     protected String link;
  33     protected String description;
  34     protected String author;
  35     protected String guid;
  36     protected boolean isPermaLink = true;
  37     protected String date;
  38
  39     protected boolean readFlag = false;
  40
  41     /**
  42      * Constructor for Item.
  43      */
  44     public Item(Channel channel, Element itemElement) {
  45         this.channel = channel;
  46         this.title = readValue("title", itemElement, 0);
  47         this.link = readValue("link", itemElement, 0);
  48         this.description = readValue("description", itemElement, 0);
  49         this.author = readValue("author", itemElement, 0);
  50         this.guid = readValue("guid", itemElement, 1);
  51         String pubDate = readValue("pubDate", itemElement, 0);
  52         String dcDate = readValue("dc:date", itemElement, 0);
  53
  54         try {
  55             Date theDate;
  56             if(pubDate != null) {
  57                 theDate = pubDateParser.parse(pubDate);
  58             } else if(dcDate != null) {
  59                 theDate = decodeDCDate(dcDate);
  60             } else {
  61                 theDate = new Date();
  62             }
  63             this.date = dateFormat.format(theDate);
  64         } catch(Exception e) {
  65             if(pubDate != null) {
  66                 this.date = pubDate;
  67             } else if(dcDate != null) {
  68                 this.date = dcDate;
  69             } else {
  70                 this.date = e.toString();
  71             }
  72             Plugin.logInfo("Unable to parse date",e);
  73         }
  74     }
  75
  76     protected String readValue(String elementName, Element parent, int type) {
  77         Element element = (Element)parent.getElementsByTagName(elementName).item(0);
  78         if(element != null) {
  79
  80             switch(type) {
  81                 case 1:
  82                     if(element.hasAttribute("isPermaLink") && element.getAttribute("isPermaLink").equals("false")) {
  83                         this.isPermaLink = false;
  84                     }
  85             }
  86
  87             NodeList children = element.getChildNodes();
  88             StringBuffer buffer = new StringBuffer();
  89             for(int i=0; i<children.getLength(); i++) {
  90                 Node node = children.item(i);
  91                 if(node.getNodeType()==Node.TEXT_NODE || node.getNodeType()==Node.CDATA_SECTION_NODE) {
  92                         buffer.append(((Text)node).getData());
  93                 }
  94             }
  95             return buffer.toString().trim();
  96         } else {
  97             return null;
  98         }
  99     }
 100
 101     public String getUsableTitle() {
 102         if(title != null) {
 103             return title;
 104         } else if (description != null) {
 105             return description;
 106         } else {
 107             return "!! No title in feed !!";
 108         }
 109     }
 110
 111     public String getUsableLink() {
 112         if(link != null) {
 113             return link;
 114         } else if (guid != null && isPermaLink) {
 115             return guid;
 116         } else {
 117             return "about:blank";
 118         }
 119     }
 120
 121     public boolean isBanned() {
 122         return Plugin.getDefault().isBannedTitle(title);
 123     }
 124
 125     public TableItem toTableItem(Table table) {
 126         TableItem tableItem = new TableItem(table, SWT.NONE);
 127         fillTableItem(tableItem);
 128         return tableItem;
 129     }
 130
 131     public void fillTableItem(TableItem tableItem) {
 132         tableItem.setText(new String[] {date,readFlag?"":"*",getUsableTitle()});
 133         tableItem.setData(this);
 134     }
 135
 136     /**
 137      * Sets the readFlag and notifies the listeners
 138      * that the status changed.
 139      * @param readFlag The readFlag to set
 140      */
 141     public void setReadFlag(boolean readFlag) {
 142         if(readFlag != this.readFlag) {
 143             this.readFlag = readFlag;
 144             channel.computeUnRead();
 145         }
 146     }
 147
 148     /**
 149      * @see java.lang.Object#equals(Object)
 150      */
 151     public boolean equals(Object obj) {
 152         return (obj instanceof Item)
 153                 && ((Item)obj).getUID().equals(this.getUID());
 154     }
 155
 156     protected static Date decodeDCDate(String string) throws Exception {
 157         GregorianCalendar calendar = new GregorianCalendar(readInt(string,0,4),0,1,0,0,0);
 158         calendar.set(Calendar.MILLISECOND,0);
 159         calendar.set(Calendar.DST_OFFSET,0);
 160         if(checkChar(string,4,'-')) {
 161             calendar.set(Calendar.MONTH,readInt(string,5,2)-1);
 162             if(checkChar(string,7,'-')) {
 163                 calendar.set(Calendar.DATE,readInt(string,8,2));
 164                 if(checkChar(string,10,'T')) {
 165                     calendar.set(Calendar.HOUR_OF_DAY,readInt(string,11,2));
 166                     calendar.set(Calendar.MINUTE,readInt(string,14,2));
 167                     int length = string.length();
 168                     int position = 16;
 169
 170                     //les secondes + millisecondes
 171                     if(checkChar(string,16,':')) {
 172                         calendar.set(Calendar.SECOND,readInt(string,17,2));
 173                         position = 19;
 174                         if(checkChar(string,position,'.')) {
 175                             position += 1;
 176                             StringBuffer millisecondBuffer = new StringBuffer("0.");
 177                             while(position<length && Character.isDigit(string.charAt(position))) {
 178                                 millisecondBuffer.append(string.charAt(position));
 179                                 position += 1;
 180                             }
 181                             calendar.set(Calendar.MILLISECOND,(int)(Double.parseDouble(millisecondBuffer.toString())*1000));
 182                         }
 183
 184                     }
 185
 186
 187                     //TZD
 188                     if(string.charAt(position) == 'Z') {
 189                         calendar.set(Calendar.ZONE_OFFSET,0);
 190                         if(length != position +1) {
 191                             //trop de caractères
 192                             throw new Exception("Invalid format of dc:date (extra tokens)");
 193                         }
 194                     } else if(string.charAt(position) == '+' || string.charAt(position) == '-') {
 195                         int sign = 0;
 196                         sign = string.charAt(position) == '+'?1:-1;
 197                         int hour = readInt(string,position+1,2);
 198                         int minute = readInt(string,position+4,2);
 199                         calendar.set(Calendar.ZONE_OFFSET,sign*(hour*60*60*1000+minute*60*1000));
 200                         if(length != position +6) {
 201                             //trop de caractères
 202                             throw new Exception("Invalid format of dc:date (extra tokens)");
 203                         }
 204                     } else {
 205                         throw new Exception("Invalid format of dc:date (invalid TZD)");
 206                     }
 207
 208                 }
 209             }
 210         }
 211         return calendar.getTime();
 212     }
 213
 214     private static int readInt(String buffer, int position, int length) {
 215         int result = Integer.parseInt(buffer.substring(position,position+length));
 216         return result;
 217     }
 218
 219     private static boolean checkChar(String buffer, int position, char expectedChar) {
 220         if(buffer.length() > position && buffer.charAt(position) == expectedChar) {
 221             return true;
 222         } else {
 223             return false;
 224         }
 225     }
 226
 227     /**
 228      * @return the description of this item
 229      */
 230     public String getDescription() {
 231         return description;
 232     }
 233     /**
 234      * @return the author of this item
 235      */
 236     public String getAuthor() {
 237         return author;
 238     }
 239
 240     /**
 241      * Returns the date.
 242      * @return String
 243      */
 244     public String getDate() {
 245         return date;
 246     }
 247
 248     /**
 249      * Returns the readFlag.
 250      * @return boolean
 251      */
 252     public boolean isReadFlag() {
 253         return readFlag;
 254     }
 255
 256     /**
 257      * Returns the channel.
 258      * @return Channel
 259      */
 260     public Channel getChannel() {
 261         return channel;
 262     }
 263
 264     /**
 265      * Returns a unique ID used to remember which
 266      * items were read in the ChannelStore
 267      * @return
 268      */
 269     public String getUID() {
 270         return getUsableLink() + ") ~ (" + getUsableTitle();
 271     }
 272
 273 }