Coverage Report - org.webmacro.engine.ParserProvider
 
Classes in this File Line Coverage Branch Coverage Complexity
ParserProvider
63%
37/58
42%
6/14
3.889
ParserProvider$1
N/A
N/A
3.889
ParserProvider$SettingHandler
66%
4/6
N/A
3.889
 
 1  
 /*
 2  
  * Copyright (C) 1998-2000 Semiotek Inc.  All Rights Reserved.
 3  
  *
 4  
  * Redistribution and use in source and binary forms, with or without
 5  
  * modification, are permitted under the terms of either of the following
 6  
  * Open Source licenses:
 7  
  *
 8  
  * The GNU General Public License, version 2, or any later version, as
 9  
  * published by the Free Software Foundation
 10  
  * (http://www.fsf.org/copyleft/gpl.html);
 11  
  *
 12  
  *  or
 13  
  *
 14  
  * The Semiotek Public License (http://webmacro.org/LICENSE.)
 15  
  *
 16  
  * This software is provided "as is", with NO WARRANTY, not even the
 17  
  * implied warranties of fitness to purpose, or merchantability. You
 18  
  * assume all risks and liabilities associated with its use.
 19  
  *
 20  
  * See www.webmacro.org for more information on the WebMacro project.
 21  
  */
 22  
 
 23  
 
 24  
 package org.webmacro.engine;
 25  
 
 26  
 import java.lang.reflect.Constructor;
 27  
 import java.lang.reflect.InvocationTargetException;
 28  
 import java.util.Hashtable;
 29  
 
 30  
 import org.slf4j.Logger;
 31  
 import org.slf4j.LoggerFactory;
 32  
 
 33  
 import org.webmacro.Broker;
 34  
 import org.webmacro.InitException;
 35  
 import org.webmacro.NotFoundException;
 36  
 import org.webmacro.Provider;
 37  
 import org.webmacro.util.Instantiator;
 38  
 import org.webmacro.util.Settings;
 39  
 
 40  
 /**
 41  
  * Utility class to assist in the creation of directives.
 42  
  */
 43  6
 public final class ParserProvider implements Provider
 44  
 {
 45  2
     static Logger _log =  LoggerFactory.getLogger(Instantiator.class);
 46  
 
 47  
     // BULDER CLASS MANAGEMENT
 48  
 
 49  6
     private final Hashtable _parsers = new Hashtable();
 50  
 
 51  6
     private Broker _broker = null;
 52  6
     private final Class[] _brokerParam = {Broker.class};
 53  6
     private final Object[] _brokerArg = new Object[1];
 54  
 
 55  
     /**
 56  
      * Register a new parser class.
 57  
      * @exception IntrospectionException something wrong with the class
 58  
      * @exception InitException duplicate registration
 59  
      */
 60  
     public final void register (String pClassName, String pType)
 61  
             throws IntrospectionException, InitException
 62  
     {
 63  
         Class pclass;
 64  6
         String pname = extractName(pClassName);
 65  6
         String name = (pType != null && !pType.equals(""))
 66  
                 ? pType : pname;
 67  
         try
 68  
         {
 69  6
             pclass = _broker.classForName(pClassName);
 70  
         }
 71  0
         catch (Exception e)
 72  
         {
 73  0
             throw new IntrospectionException("No class " + pClassName);
 74  6
         }
 75  
         try
 76  
         {
 77  6
             _log.info("Registering parser: " + name + " (" + pClassName + ")");
 78  6
             Parser p = (Parser) _parsers.get(name);
 79  6
             if (p == null)
 80  
             {
 81  6
                 Constructor ctor = pclass.getConstructor(_brokerParam);
 82  6
                 p = (Parser) ctor.newInstance(_brokerArg);
 83  6
                 _parsers.put(name, p);
 84  6
             }
 85  0
             else if (!pclass.equals(p.getClass()))
 86  
             {
 87  0
                 throw new InitException(
 88  
                         "Attempt to register parser " + pClassName
 89  
                         + " failed because " + p.getClass()
 90  
                         + " is already registered for type " + name);
 91  
             }
 92  
         }
 93  0
         catch (InstantiationException ne)
 94  
         {
 95  0
             throw new IntrospectionException("Parsers could not be instantiated",
 96  
                     ne);
 97  
         }
 98  0
         catch (IllegalAccessException ia)
 99  
         {
 100  0
             throw new IntrospectionException("Parser class must be public", ia);
 101  
         }
 102  0
         catch (InvocationTargetException it)
 103  
         {
 104  0
             throw new InitException("Parser threw an exception", it);
 105  
         }
 106  0
         catch (NoSuchMethodException nm)
 107  
         {
 108  0
             throw new IntrospectionException(
 109  
                     "Parser missing the required constructor", nm);
 110  6
         }
 111  6
     }
 112  
 
 113  
     public final Parser getParser (String pname)
 114  
             throws NotFoundException
 115  
     {
 116  228
         Parser p = (Parser) _parsers.get(pname);
 117  228
         if (p == null)
 118  
         {
 119  0
             throw new NotFoundException("No parser registered for type "
 120  
                     + pname);
 121  
         }
 122  228
         return p;
 123  
     }
 124  
 
 125  
     private static String extractName (String par)
 126  
             throws IntrospectionException
 127  
     {
 128  6
         if (!par.endsWith("Parser"))
 129  
         {
 130  0
             throw new IntrospectionException(
 131  
                     "Malformed classname (" + par + "), must end with Parser");
 132  
         }
 133  6
         int end = par.length() - 6;
 134  6
         int start = par.lastIndexOf('.', end) + 1;
 135  6
         String parName = par.substring(start, end);
 136  6
         if (par.startsWith("org.webmacro."))
 137  
         {
 138  6
             parName = parName.toLowerCase();
 139  
         }
 140  6
         return parName;
 141  
     }
 142  
 
 143  
 
 144  
     public String getType ()
 145  
     {
 146  6
         return "parser";
 147  
     }
 148  
 
 149  12
     private class SettingHandler extends Settings.ListSettingHandler
 150  
     {
 151  
 
 152  
         public void processSetting (String settingKey, String settingValue)
 153  
         {
 154  
             try
 155  
             {
 156  6
                 register(settingValue, settingKey);
 157  
             }
 158  0
             catch (Exception ce)
 159  
             {
 160  0
                 _log.error("Could not load parser: " + settingValue, ce);
 161  6
             }
 162  6
         }
 163  
     }
 164  
 
 165  
     public void init (Broker broker, Settings p) throws InitException
 166  
     {
 167  6
         _brokerArg[0] = broker;
 168  6
         _broker = broker;
 169  
 
 170  
         try
 171  
         {
 172  6
             p.processListSetting("Parsers", new SettingHandler());
 173  
         }
 174  0
         catch (Exception e)
 175  
         {
 176  0
             throw new InitException("Could not init ParserProvider", e);
 177  6
         }
 178  6
     }
 179  
 
 180  
     public void destroy ()
 181  
     {
 182  0
         _parsers.clear();
 183  0
     }
 184  
 
 185  
     public Object get (String name) throws NotFoundException
 186  
     {
 187  
         try
 188  
         {
 189  228
             return getParser(name);
 190  
         }
 191  0
         catch (Exception e)
 192  
         {
 193  0
             throw new NotFoundException("No such parser: " + name, e);
 194  
         }
 195  
     }
 196  
 
 197  
     public void flush ()
 198  
     {
 199  0
     }
 200  
 }
 201  
 
 202