package org.webslinger.rules;

 import java.io.IOException;

 import java.io.StringReader;

 import org.apache.commons.vfs.FileObject;

 import org.webslinger.commons.vfs.VFSUtil;

 import org.webslinger.container.WebslingerContainer;

 import org.webslinger.util.GeneratedResult;

 import org.webslinger.util.TTLCachedObject;

 import org.webslinger.util.TTLObject;

 public class CSSRulesTTLCachedObject extends TTLCachedObject<CompiledRules> {

     static {

         TTLObject.setDefaultTTLForClass(CSSRulesTTLCachedObject.class, 1000);

     }

     private final WebslingerContainer container;

     private final FileObject file;

     public CSSRulesTTLCachedObject(WebslingerContainer container, FileObject file) {

         this.container = container;

         this.file = file;

     }

     protected long getTimestamp(CompiledRules old) throws IOException {

         if (!file.exists()) return NOT_EXISTANT_TIMESTAMP;

         return file.getContent().getLastModifiedTime();

     }

     protected GeneratedResult<CompiledRules> generate(CompiledRules old) throws IOException {

         CompiledRules compiledRules;

         Rules rulesParser = new Rules(new StringReader(VFSUtil.getString(file)));

         try {

             CSSRules cssRules = rulesParser.Rules();

             compiledRules = cssRules.compile(container);

         } catch (ParseException e) {

             throw (IOException) new IOException(e.getMessage()).initCause(e);

         }

         return new GeneratedResult<CompiledRules>(file.getContent().getLastModifiedTime(), compiledRules);

     }

 }