ConfigBuilder.java

/*
** Module   : ConfigBuilder.java
** Abstract : Implementation of the builtin class.
**
** Copyright (c) 2019-2023, Golden Code Development Corporation.
**
** -#- -I- --Date-- ---------------------------------------Description----------------------------------------
** 001 CA  20190526 First version, stubs taken by converting the skeleton using FWD.
** 002 IAS 20190923 Implementation of the business logic
** 003 CA  20191024 Added method support levels and updated the class support level.
** 004 ME  20201202 Options map is case insensitive in 4GL.
**         20201207 Use character as map key since unknown keys are allowed in 4GL.
**                  Add new methods as of OE12.2.
** 005 CA  20210221 Added 'extent' for getOptionStringArrayValue method.
** 006 ME  20210310 Increment object reference on option set, decrement on remove.
**     ME  20210310 Return ObjectVar on getOptionObjectValue so the reference is incremented.
**     VVT 20210917 Javadoc fixed. 
**     CA  20220120 Do not used TypeFactory.object when the OO reference must not be tracked or registered.
**                  Do not use TypeFactory.object for internal usages, use ObjectVar if the reference must 
**                  be tracked.
**                  All TypeFactory.object variable definitions must be done outside of the top-level block.
**     CA  20220923 Variable definitions (including associated with parameters) must be done always outside of 
**                  the BlockManager API
** 007 CA  20231113 The 'execute' method must be annotated with LegacySignature Type.Execute, and also can be
**                  dropped if is a no-op.
** 008 AL2 20240930 Added destructor which calls ClearOptions. Added reference count management to 
**                  ClearOptions and SetOption. 
*/

/*
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU Affero General Public License for more details.
**
** You may find a copy of the GNU Affero GPL version 3 at the following
** location: https://www.gnu.org/licenses/agpl-3.0.en.html
** 
** Additional terms under GNU Affero GPL version 3 section 7:
** 
**   Under Section 7 of the GNU Affero GPL version 3, the following additional
**   terms apply to the works covered under the License.  These additional terms
**   are non-permissive additional terms allowed under Section 7 of the GNU
**   Affero GPL version 3 and may not be removed by you.
** 
**   0. Attribution Requirement.
** 
**     You must preserve all legal notices or author attributions in the covered
**     work or Appropriate Legal Notices displayed by works containing the covered
**     work.  You may not remove from the covered work any author or developer
**     credit already included within the covered work.
** 
**   1. No License To Use Trademarks.
** 
**     This license does not grant any license or rights to use the trademarks
**     Golden Code, FWD, any Golden Code or FWD logo, or any other trademarks
**     of Golden Code Development Corporation. You are not authorized to use the
**     name Golden Code, FWD, or the names of any author or contributor, for
**     publicity purposes without written authorization.
** 
**   2. No Misrepresentation of Affiliation.
** 
**     You may not represent yourself as Golden Code Development Corporation or FWD.
** 
**     You may not represent yourself for publicity purposes as associated with
**     Golden Code Development Corporation, FWD, or any author or contributor to
**     the covered work, without written authorization.
** 
**   3. No Misrepresentation of Source or Origin.
** 
**     You may not represent the covered work as solely your work.  All modified
**     versions of the covered work must be marked in a reasonable way to make it
**     clear that the modified work is not originating from Golden Code Development
**     Corporation or FWD.  All modified versions must contain the notices of
**     attribution required in this license.
*/

package com.goldencode.p2j.oo.core.util;

import static com.goldencode.p2j.util.BlockManager.*;
import static com.goldencode.p2j.report.ReportConstants.*;
import static com.goldencode.p2j.util.ErrorManager.*;

import java.util.*;

import com.goldencode.p2j.oo.core.*;
import com.goldencode.p2j.oo.json.objectmodel.*;
import com.goldencode.p2j.oo.lang.*;
import com.goldencode.p2j.util.*;
import com.goldencode.p2j.util.InternalEntry.*;

/**
 *    helper class for configuration data used by builders
 */
@LegacyResource(resource = "OpenEdge.Core.Util.ConfigBuilder")
@LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
public abstract class ConfigBuilder
extends BaseObject
{
   private static final String JSON_ARRAY = "Progress.Json.ObjectModel.JsonArray";

   /** Option helpers by type map. */
   private static final Map<Class<?>, OptionTypeHelper<?>> TYPES = Collections.unmodifiableMap(
         new HashMap<Class<?>, OptionTypeHelper<?>>() 
         {
         {
            put(decimal.class, new OptionTypeHelper<decimal>("number")
            {
               @Override
               public decimal newInstance()
               {
                  return new decimal();
               }
            });
            put(object.class, new OptionTypeHelper<object<? extends BaseObject>>("object")
            {
               @Override
               public object<? extends BaseObject> newInstance()
               {
                  return new ObjectVar<>(BaseObject.class);
               }
            
            });
            put(character.class, new OptionTypeHelper<character>("string")
            {
               @Override
               public character newInstance()
               {
                  return new character();
               }
            });
            put(logical.class, new OptionTypeHelper<logical>("logical")
            {
               @Override
               public logical newInstance()
               {
                  return new logical();
               }
            });
            put(datetimetz.class, new OptionTypeHelper<datetimetz>("datetime")
            {
               @Override
               public datetimetz newInstance()
               {
                  return new datetimetz();
               }
            });
         }}
   ); 
   
   /** Options by name map. */
   protected final Map<character, OptionValueHolder> options = new HashMap<character, ConfigBuilder.OptionValueHolder>(); 
   
   /**
    * Constructor. 
    */
   @LegacySignature(type = Type.CONSTRUCTOR)
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public void __core_util_ConfigBuilder_constructor__()
   {
      internalProcedure(this, "__core_util_ConfigBuilder_constructor__", new Block((Body) () -> 
      {
         __lang_BaseObject_constructor__();
      }));
   }

   /**
    * Appends a character value to an array.
    * 
    * @param _p1 optiona name.
    * @param _p2 value to append.
    * 
    * @return <code>true</code> if option was updated. 
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "AppendArrayCharacterValue", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT"),
      @LegacyParameter(name = "p2", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical appendArrayCharacterValue(final character _p1, final character _p2)
   {
      character key = TypeFactory.initInput(_p1);
      character val = TypeFactory.initInput(_p2);
      object<? extends JsonArray> arr = TypeFactory.object(JsonArray.class);
      
      return function(this, "AppendArrayCharacterValue", logical.class, new Block((Body) () -> 
      {
         Assert.notNullOrEmpty(key, new character("Config name"));
         
        arr.assign(!hasOption(key).booleanValue() ?
               ObjectOps.newInstance(JsonArray.class) :
               ObjectOps.cast(getOption(key, object.class), JsonArray.class)
         );
         arr.ref().add(val);
         returnNormal(setOption(key, arr));
      }));
   }

   /**
    * Clears all options for this builder.
    */
   @LegacySignature(type = Type.METHOD, name = "ClearOptions")
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public void clearOptions()
   {
      internalProcedure(this, "ClearOptions", new Block((Body) () -> 
      {
         options.values().forEach(entry -> 
         {
            Object val = entry.value();
            if (val != null && val instanceof object && ((object<?>) val)._isValid())
            {
               ObjectOps.decrement(((object<?>) val).ref());
            }
         });
         
         options.clear();
      }));
   }

   /**
    * Returns an option's datetime value.
    * 
    * @param _p1 option name.
    * 
    * @return the value.
    */
   @LegacySignature(returns = "DATETIMETZ", type = Type.METHOD, name = "GetOptionDateTimeValue", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public datetimetz getOptionDateTimeValue(final character _p1)
   {
      character p1 = TypeFactory.initInput(_p1);
      
      return function(this, "GetOptionDateTimeValue", datetimetz.class, new Block((Body) () -> 
      {
         returnNormal(getOption(p1, datetimetz.class));
      }));
   }

   /**
    * Returns an option's logical value.
    * 
    * @param _p1 option name.
    * 
    * @return the value.
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "GetOptionLogicalValue", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical getOptionLogicalValue(final character _p1)
   {
      character p1 = TypeFactory.initInput(_p1);
      
      return function(this, "GetOptionLogicalValue", logical.class, new Block((Body) () -> 
      {
         returnNormal(getOption(p1, logical.class));
      }));
   }

   /**
    * Returns an option's longchar value.
    * 
    * @param _p1 option name.
    * 
    * @return the value.
    */
   @LegacySignature(returns = "LONGCHAR", type = Type.METHOD, name = "GetOptionLongcharValue", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public longchar getOptionLongcharValue(final character _p1)
   {
      character p1 = TypeFactory.initInput(_p1);
      
      return function(this, "GetOptionLongcharValue", longchar.class, new Block((Body) () -> 
      {
         longchar val = TypeFactory.longchar();
         val.assign(getOption(p1, character.class));
         returnNormal(val);
      }));
   }

   /**
    * Returns an option's numeric value.
    * 
    * @param _p1 option name.
    * 
    * @return the value.
    */
   @LegacySignature(returns = "DECIMAL", type = Type.METHOD, name = "GetOptionNumericValue", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public decimal getOptionNumericValue(final character _p1)
   {
      character p1 = TypeFactory.initInput(_p1);
      
      return function(this, "GetOptionNumericValue", decimal.class, new Block((Body) () -> 
      {
         returnNormal(getOption(p1, decimal.class));
      }));
   }

   /**
    * Returns an option's object value.
    * 
    * @param _p1 option name.
    * 
    * @return the value.
    */
   @LegacySignature(returns = "OBJECT", type = Type.METHOD, name = "GetOptionObjectValue", qualified = "progress.lang.object", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public object<? extends _BaseObject_> getOptionObjectValue(final character _p1)
   {
      character p1 = TypeFactory.initInput(_p1);
      object<? extends _BaseObject_> ret = TypeFactory.object(_BaseObject_.class);
      
      return function(this, "GetOptionObjectValue", object.class, new Block((Body) () -> 
      {
         ret.assign(getOption(p1, object.class));
         
         returnNormal(ret);
      }));
   }

   /**
    * Returns an option's character[] value.
    * 
    * @param _p1 option name.
    * 
    * @return the value.
    */
   @LegacySignature(returns = "CHARACTER", type = Type.METHOD, extent = -1, name = "GetOptionStringArrayValue", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public character[] getOptionStringArrayValue(final character _p1)
   {
      character key = TypeFactory.initInput(_p1);
      object<? extends JsonArray> arr = TypeFactory.object(JsonArray.class);
      character[][] val = { TypeFactory.characterExtent() };

      return extentFunction(this, "GetOptionStringArrayValue", character.class, new Block((Body) () -> 
      {
         object<? extends _BaseObject_>  obj = getOption(key, object.class);
         if (obj.isValid().booleanValue())
         {
            Assert.isType(obj, ObjectOps.getLegacyClass(JsonArray.class));
            arr.assign(ObjectOps.cast(obj, JsonArray.class));
            JsonArray json = arr.ref();
            if(ObjectOps.isValid(json))
            {
               val[0] = ArrayAssigner.resize(val[0], json.getLength().intValue());
               for(int i = 0; i < val.length; i++)
               {
                  ArrayAssigner.assignSingle(val[0], i + 1, json.getCharacter(new integer(i + 1)));
               }
            }
            
         }
         returnExtentNormal(val[0]);
      }));
   }

   /**
    * Returns an option's character value.
    * 
    * @param _p1 option name.
    * 
    * @return the value.
    */
   @LegacySignature(returns = "CHARACTER", type = Type.METHOD, name = "GetOptionStringValue", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public character getOptionStringValue(final character _p1)
   {
      character p1 = TypeFactory.initInput(_p1);
      
      return function(this, "GetOptionStringValue", character.class, new Block((Body) () -> 
      {
         returnNormal(getOption(p1, character.class));
      }));
   }

   /**
    *  Checks whether a config option already exists.
    * 
    * @param _p1 option name.
    * 
    * @return <code>true</code> if the named configuration option exists.
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "HasOption", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical hasOption(final character _p1)
   {
      character key = TypeFactory.initInput(_p1);
      
      return function(this, "HasOption", logical.class, new Block((Body) () -> 
      {
         Assert.notNullOrEmpty(key, new character("Config name"));
         returnNormal(
               new logical(options.containsKey(key))
         );
      }));
   }
   
   /**
    * Check if options map (characters) contains the string key.
    *  
    * @param key the key name
    * 
    * @return {@code true} is there is an option with the given name
    */
   protected boolean _hasOption (String key) {
      return options.containsKey(new character(key));
   }

   /**
    * Removes an option
    * 
    * @param _p1 option name
    * 
    * @return <code>true</code> if the named configuration was removed.
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "RemoveOption", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical removeOption(final character _p1)
   {
      character key = TypeFactory.initInput(_p1);
      
      return function(this, "RemoveOption", logical.class, new Block((Body) () -> 
      {
         OptionValueHolder val = options.remove(key);
         
         if (val != null && val.value() != null && val.type() == "object") {
            object obj = (object) val.value();
            if (obj._isValid())
               ObjectOps.decrement(obj.ref());
         }
         
         returnNormal(new logical( val != null));
      }));
   }

   /**
    * Stores a character value as an option.
    * 
    * @param _p1 option name.
    * @param _p2 option value,
    *
    * @return <code>true</code> if the named configuration was replaced.
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "SetOption", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT"),
      @LegacyParameter(name = "p2", type = "CHARACTER", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical setOption(final character _p1, final character _p2)
   {
      character p1 = TypeFactory.initInput(_p1);
      character p2 = TypeFactory.initInput(_p2);
      
      return function(this, "SetOption", logical.class, new Block((Body) () -> 
      {
         returnNormal(setOption(p1, p2, character.class));
      }));
   }

   /**
    * Stores a character value as an option.
    * 
    * @param _p1 option name.
    * @param _p2 option value,
    *
    * @return <code>true</code> if the named configuration was replaced.
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "SetOption", parameters = {
            @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT"),
            @LegacyParameter(name = "p2", type = "CHARACTER", extent = -1, mode = "INPUT") })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical setOption(final character _p1, final character[] _p2)
   {
      character p1 = TypeFactory.initInput(_p1);
      character p2[] = TypeFactory.initInput(_p2);
      object<JsonArray> json = TypeFactory.object(JsonArray.class);

      return function(this, "SetOption", logical.class,
               new Block((Body) () -> {
                  if (p2.length > 0) 
                  {
                     // work around issue on ctor with extent parameter
                     json.assign(ObjectOps.newInstance(JsonArray.class));
                     
                     for (character chr : p2)
                     {
                        json.ref().add(chr);
                     }
                  }
                  
                  returnNormal(setOption(p1, json));
               }));
   }
   
   /**
    * Stores a datetime-tz value as an option.
    * 
    * @param _p1 option name.
    * @param _p2 option value,
    *
    * @return <code>true</code> if the named configuration was replaced.
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "SetOption", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT"),
      @LegacyParameter(name = "p2", type = "DATETIMETZ", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical setOption(final character _p1, final datetimetz _p2)
   {
      character p1 = TypeFactory.initInput(_p1);
      datetimetz p2 = TypeFactory.initInput(_p2);
      
      return function(this, "SetOption", logical.class, new Block((Body) () -> 
      {
         returnNormal(setOption(p1, p2, datetimetz.class));
      }));
   }

   /**
    * Stores a decimal value as an option.
    * 
    * @param _p1 option name.
    * @param _p2 option value,
    *
    * @return <code>true</code> if the named configuration was replaced.
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "SetOption", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT"),
      @LegacyParameter(name = "p2", type = "DECIMAL", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical setOption(final character _p1, final decimal _p2)
   {
      character p1 = TypeFactory.initInput(_p1);
      decimal p2 = TypeFactory.initInput(_p2);
      
      return function(this, "SetOption", logical.class, new Block((Body) () -> 
      {
         returnNormal(setOption(p1, p2, decimal.class));
      }));
   }

   /**
    * Stores a logical value as an option.
    * 
    * @param _p1 option name.
    * @param _p2 option value,
    *
    * @return <code>true</code> if the named configuration was replaced.
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "SetOption", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT"),
      @LegacyParameter(name = "p2", type = "LOGICAL", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical setOption(final character _p1, final logical _p2)
   {
      character p1 = TypeFactory.initInput(_p1);
      logical p2 = TypeFactory.initInput(_p2);
      
      return function(this, "SetOption", logical.class, new Block((Body) () -> 
      {
         returnNormal(setOption(p1, p2, logical.class));
      }));
   }

   /**
    * Stores an object value as an option.
    * 
    * @param _p1 option name.
    * @param _p2 option value,
    *
    * @return <code>true</code> if the named configuration was replaced.
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "SetOption", parameters = 
   {
      @LegacyParameter(name = "p1", type = "CHARACTER", mode = "INPUT"),
      @LegacyParameter(name = "p2", type = "OBJECT", qualified = "progress.lang.object", mode = "INPUT")
   })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical setOption(final character _p1, final object<? extends _BaseObject_> _p2)
   {
      character p1 = TypeFactory.initInput(_p1);
      object<? extends _BaseObject_> p2 = TypeFactory.initInput(_p2);
      
      return function(this, "SetOption", logical.class, new Block((Body) () -> 
      {
         if (p2._isValid()) 
         {
            ObjectOps.increment(p2.ref());
         }
         
         returnNormal(setOption(p1, p2, object.class));
      }));
   }
   
   /**
    * Stores an object value as an option.
    * 
    * @param _p1 option name.
    * @param _p2 option value,
    *
    * @return <code>true</code> if the named configuration was replaced.
    */
   @LegacySignature(returns = "LOGICAL", type = Type.METHOD, name = "SetOption", parameters = {
            @LegacyParameter(name = "p1", type = "OBJECT", qualified = "progress.lang.class", mode = "INPUT"),
            @LegacyParameter(name = "p2", type = "OBJECT", qualified = "progress.lang.object", mode = "INPUT") })
   @LegacyResourceSupport(supportLvl = CVT_LVL_FULL|RT_LVL_FULL)
   public logical setOption(final object<? extends com.goldencode.p2j.oo.lang.LegacyClass> _p1,
            final object<? extends com.goldencode.p2j.oo.lang._BaseObject_> _p2)
   {
      object<? extends LegacyClass> p1 = TypeFactory.initInput(_p1);
      object<? extends _BaseObject_> p2 = TypeFactory.initInput(_p2);

      return function(this, "SetOption", logical.class, new Block((Body) () -> {
         Assert.notNull(p1, new character("Config name"));

         returnNormal(setOption(p1.ref().getTypeName(), p2));
      }));
   }
   
   /**
    * Destructor.
    */
   @LegacySignature(type = Type.DESTRUCTOR)
   public void __core_util_ConfigBuilder_destructor__()
   {
      internalProcedure(ConfigBuilder.class, this, "__core_util_ConfigBuilder_destructor__", new Block((Body) () -> 
      {
         this.clearOptions();
      }));
   }
   
   /**
    * Stores a value as an option.
    * 
    * @param key option name.
    * @param val option value,
    * @param cls option type
    * 
    * @return <code>true</code> if the named configuration was replaced.
    */
   private <T> logical setOption(character key, T val, Class<T> cls)
   {
      // in 4GL the error status is reset, probably some find with no-error
      silent(() -> {});
      
      OptionTypeHelper<T> helper = (OptionTypeHelper<T>) TYPES.get(cls);
      OptionValueHolder oldValue = options.put(key, new OptionValueHolder(helper.type, val));
      if (oldValue != null)
      {
         Object oldVal = oldValue.value;
         if (oldVal instanceof object && ((object<?>) oldVal)._isValid()) 
         {
            ObjectOps.decrement(((object<?>) oldVal).ref());
         }
      }
      
      return new logical(oldValue != null);
   }
   
   /**
    * Get option value by name
    *  
    * @param key option name.
    * @param cls option value type.
    * 
    * @return option value.
    */
   private <T> T getOption(character key, Class<T> cls)
   {
      // in 4GL the error status is reset, probably some find with no-error
      silent(() -> {});
      
      OptionTypeHelper<T> helper = (OptionTypeHelper<T>) TYPES.get(cls);
      OptionValueHolder val = options.get(key);
      if (val == null)
      {
         return helper.newInstance();
      }
      Assert.legacyEquals(new character(val.type()), new character(helper.type()));
      return (T)val.value();
   }

   /**
    * A helper class to encapsulate option types
    *
    * @param <T> option type.
    */
   protected static abstract class OptionTypeHelper<T>
   {
      /** Option type name. */
      private final String type;
      
      /**
       * Constructor.
       * 
       * @param type option type name
       */
      public OptionTypeHelper(String type)
      {
         super();
         this.type = type;
      }
      public abstract T newInstance();
      String type()
      {
         return type;
      }
   }
   
   /**
    * A helper class to encapsulate option value
    */
   protected static class  OptionValueHolder
   {
      /** Option type name. */
      private final String type;
      /** Option value. */
      private final Object value;

      /**
       * Constructor.
       * 
       * @param type option type name.
       * @param value option value.
       */
      public OptionValueHolder(String type, Object value)
      {
         this.type = type;
         this.value = value;
      }

      /**
       * Get option type name.
       * 
       * @return option type name.
       */
      public String type()
      {
         return type;
      }

      /**
       * Get option value.
       * 
       * @return option value.
       */
      public Object value()
      {
         return value;
      }
      
   }
}