devinsy/devinsy-rss
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Add RSS classes.

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This commit is contained in:
Christian P. MOMON 2013-09-17 16:27:48 +02:00
parent 31b9501cde
commit b2c058caf3
3 changed files with 469 additions and 0 deletions
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173
src/fr/devinsy/util/rss/RSSCache.java Normal file
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package fr.devinsy.util.rss;
import java.util.HashMap;
import java.util.Locale;
/**
* @author christian.momon@devinsy.fr, 2013, copyright.
*
* This file is free software under the terms of the GNU Library General
* Public License as published by the Free Software Foundation version 3
* or any later version.
*/
public class RSSCache
{
private static RSSCache instance = new RSSCache();
private HashMap<String, String> cache;
/**
*
*/
private RSSCache()
{
this.cache = new HashMap<String, String>();
}
/**
*
* @param key
* @param locale
* @return
*/
public String get(final String name)
{
return get(name, Locale.ROOT);
}
/**
*
* @param name
* @param locale
* @return
*/
public String get(final String name, final Locale locale)
{
String result;
if (name == null)
{
throw new NullPointerException("name is null.");
}
else if (locale == null)
{
result = get(name, Locale.ROOT);
}
else
{
result = this.cache.get(key(name, locale));
if (result == null)
{
result = this.cache.get(name);
}
}
return result;
}
/**
*
* @param name
* @param locale
* @return
*/
private String key(final String name, final Locale locale)
{
String result;
if (locale.getLanguage().length() == 0)
{
result = name;
}
else
{
result = name + "_" + locale.getLanguage();
}
//
return result;
}
/**
*
* @param key
* @param locale
* @param rss
*/
public void put(final String name, final Locale locale, final String rss)
{
if (name == null)
{
throw new NullPointerException("name is null.");
}
else if (locale == null)
{
put(name, Locale.ROOT, rss);
}
else
{
this.cache.put(key(name, locale), rss);
}
}
/**
*
* @param name
* @param locale
* @param rss
*/
public void put(final String name, final String rss)
{
put(name, Locale.ROOT, rss);
}
/**
*
* @param name
*/
public void remove(final String name)
{
remove(name, Locale.ROOT);
}
/**
*
* @param name
*/
public void remove(final String name, final Locale locale)
{
if (name == null)
{
throw new NullPointerException("key is null.");
}
else
{
this.cache.remove(name + "-" + locale.getLanguage());
}
}
/**
*
* @param key
*/
public void setOudated(final String name)
{
for (String subkey : this.cache.keySet())
{
if (subkey.startsWith(name))
{
this.cache.remove(subkey);
}
}
}
/**
*
* @return
*/
public static RSSCache instance()
{
return instance;
}
}

139
src/fr/devinsy/util/rss/RSSElement.java Normal file
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package fr.devinsy.util.rss;
import org.joda.time.DateTime;
/**
* @author christian.momon@devinsy.fr, 2013, copyright.
*
* This file is free software under the terms of the GNU Library General
* Public License as published by the Free Software Foundation version 3
* or any later version.
*/
public class RSSElement
{
public static final String DATE_PATTERN = "dd MMM YYYY hh:mm:ss Z";
private String name;
private String value;
private String[] attributes;
/**
*
* @param name
* @param value
*/
public RSSElement(final String name, final DateTime value)
{
setName(name);
if (value == null)
{
this.value = null;
}
else
{
this.value = value.toString(DATE_PATTERN);
}
this.attributes = null;
}
/**
*
* @param name
* @param value
*/
public RSSElement(final String name, final long value)
{
setName(name);
this.value = String.valueOf(value);
this.attributes = null;
}
/**
*
* @param name
* @param value
*/
public RSSElement(final String name, final long value, final String... attributes)
{
setName(name);
this.value = String.valueOf(value);
this.attributes = attributes;
}
/**
*
* @param name
* @param value
*/
public RSSElement(final String name, final String value)
{
setName(name);
this.value = value;
this.attributes = null;
}
/**
*
* @param name
* @param value
*/
public RSSElement(final String name, final String value, final String... attributes)
{
setName(name);
this.value = value;
this.attributes = attributes;
}
public String[] getAttributes()
{
return attributes;
}
/**
*
* @return
*/
public String getName()
{
return name;
}
/**
*
* @return
*/
public String getValue()
{
return value;
}
public void setAttributes(final String[] attributes)
{
this.attributes = attributes;
}
/**
*
* @param name
*/
public void setName(final String name)
{
if (name == null)
{
throw new NullPointerException("name is null");
}
else
{
this.name = name;
}
}
/**
*
* @param value
*/
public void setValue(final String value)
{
this.value = value;
}
}

157
src/fr/devinsy/util/rss/RSSWriter.java Normal file
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package fr.devinsy.util.rss;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import fr.devinsy.util.xml.XMLWriter;
/**
* @author christian.momon@devinsy.fr, 2013, copyright.
*
* This file is free software under the terms of the GNU Library General
* Public License as published by the Free Software Foundation version 3
* or any later version.
*/
public class RSSWriter
{
private XMLWriter out;
/**
*
* @param file
* @throws FileNotFoundException
* @throws UnsupportedEncodingException
*/
public RSSWriter(final File file) throws UnsupportedEncodingException, FileNotFoundException
{
this.out = new XMLWriter(file);
writeRSSHeader();
}
/**
*
* @param target
* @throws UnsupportedEncodingException
*/
public RSSWriter(final OutputStream target) throws UnsupportedEncodingException
{
this.out = new XMLWriter(target);
writeRSSHeader();
}
/**
*
* @param target
* @throws UnsupportedEncodingException
*/
public RSSWriter(final Writer target) throws UnsupportedEncodingException
{
this.out = new XMLWriter(target);
writeRSSHeader();
}
/**
*
*/
public void close() throws IOException
{
if (this.out != null)
{
this.out.writeEndTag("channel");
this.out.writeEndTag("rss");
this.out.close();
}
}
/**
*
*/
public void flush() throws IOException
{
if (this.out != null)
{
this.out.flush();
}
}
/**
*
*/
public void writeChannel(final String title, final String link, final String description, final RSSElement... elements)
{
//
this.out.writeStartTag("channel");
//
this.out.writeTag("title", title);
this.out.writeTag("link", link);
this.out.writeTag("description", description);
//
if ((elements != null) && (elements.length > 0))
{
for (RSSElement element : elements)
{
out.writeTag(element.getName(), element.getValue(), element.getAttributes());
}
}
}
/**
*
* @param comment
*/
public void writeComment(final String comment)
{
this.out.writeComment(comment);
}
/**
*
*/
public void writeItem(final String title, final String link, final String description, final RSSElement... elements)
{
//
this.out.writeStartTag("item");
//
this.out.writeTag("title", title);
if (link != null)
{
this.out.writeTag("link", link);
}
if (description == null)
{
this.out.writeTag("description", "n/a");
}
else
{
this.out.writeTag("description", description);
}
//
if ((elements != null) && (elements.length > 0))
{
for (RSSElement element : elements)
{
out.writeTag(element.getName(), element.getValue(), element.getAttributes());
}
}
//
this.out.writeEndTag("item");
}
/**
*
*/
private void writeRSSHeader()
{
this.out.writeXMLHeader();
this.out.writeStartTag("rss", "version", "2.0");
}
}