# LegacyArgumentsParser.java

    /*
    ** Module   : LegacyArgumentsParser.java
    ** Abstract : An implementation of argument parser of a legacy REST API call.
    **
    ** Copyright (c) 2022, Golden Code Development Corporation.
    **
    ** -#- -I- --Date-- ---------------------------------------Description----------------------------------------
    ** 001 CA  20220323 Created initial version.
    */
    /*
    ** 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.rest;

    import java.io.*;
    import java.lang.reflect.*;

    import javax.servlet.http.*;

    import com.goldencode.p2j.directory.*;
    import com.goldencode.p2j.persist.*;
    import com.goldencode.p2j.util.*;

    /**
     * A parser for legacy service arguments.  This is used for legacy REST, SOAP and WebHandler services.
     */
    public class LegacyArgumentsParser
    extends ArgumentsParser
    {
       /**
        * Create a new instance.
        *
        * @param    serviceParser
        *           The main parser used to interpret the arguments for this service call, from the REST request.
        */
       public LegacyArgumentsParser(ServiceArgumentsParser serviceParser)
       {
          super(serviceParser);
       }

       /**
        * Initialize this argument.
        *
        * @param    lsp
        *           The parameter as it appears at the method's signature.
        * @param    serviceParameters
        *           The method's service parameters.
        * @param    i
        *           The parameter's index, at the method's definition.
        *
        * @return   The initialized argument.
        */
       @Override
       public Object initArgument(LegacyServiceParameter   lsp,
                                  LegacyServiceParameter[] serviceParameters,
                                  int                      i)
       {
          Object arg = null;
          String ptype = lsp.type();
          Class<?> cls = BaseDataType.fromTypeName(ptype);
          if (cls == memptr.class)
          {
             arg = new MemoryBuffer();
          }
          else if ("TABLE".equalsIgnoreCase(ptype))
          {
             if (lsp.output() && !lsp.input())
             {
                String tname = lsp.name();
                for (LegacyServiceParameter param : serviceParameters)
                {
                   if (param.ordinal() - 1 == i)
                   {
                      tname = param.name();
                      break;
                   }
                }

                TableWrapper wrapper = serviceParser.createTable(tname, lsp.input(), lsp.output(), false);
                arg = wrapper != null ? wrapper : new TableWrapper();
             }
          }
          else if ("DATASET".equalsIgnoreCase(ptype))
          {
             if (lsp.output() && !lsp.input())
             {
                String dsname = lsp.name();
                for (LegacyServiceParameter param : serviceParameters)
                {
                   if (param.ordinal() - 1 == i)
                   {
                      dsname = param.name();
                      break;
                   }
                }

                DatasetWrapper wrapper = serviceParser.createDataset(dsname, lsp.input(), lsp.output(), false);
                arg = wrapper != null ? wrapper : new DataSetContainer();
             }
          }
          else
          {
             if ("HANDLE".equalsIgnoreCase(ptype))
             {
                boolean isDataSetHandle = false;
                boolean isTableHandle = false;
                for (LegacyServiceParameter param : serviceParameters)
                {
                   if (param.ordinal() - 1 == i)
                   {
                      isDataSetHandle = "DATASET-HANDLE".equalsIgnoreCase(param.type());
                      isTableHandle = "TABLE-HANDLE".equalsIgnoreCase(param.type());
                      break;
                   }
                }

                if (isDataSetHandle)
                {
                   if (lsp.output() && !lsp.input())
                   {
                      DatasetWrapper wrapper = serviceParser.createDataset(lsp.name(), lsp.input(), lsp.output(), true);
                      arg = wrapper != null ? wrapper : new DataSetContainer();
                   }

                   return arg;
                }

                if (isTableHandle)
                {
                   if (lsp.output() && !lsp.input())
                   {
                      TableWrapper wrapper = serviceParser.createTable(lsp.name(), lsp.input(), lsp.output(), true);
                      arg = wrapper != null ? wrapper : new TableWrapper();
                   }

                   return arg;
                }
             }

             BaseDataType bdt = serviceParser.unknownInstance(ptype);
             arg = bdt;

             if (lsp.output() && lsp.extent() != SourceNameMapper.NO_EXTENT)
             {
                int length = lsp.extent() == SourceNameMapper.DYNAMIC_EXTENT ? 0 : lsp.extent();
                arg = Array.newInstance(bdt.getClass(), length);
                for (int j = 0; j < length; j++)
                {
                   Array.set(arg, j, bdt.duplicate());
                }
             }
          }

          return arg;
       }

       /**
        * Parse the argument's value from the request.
        *
        * @param    lsp
        *           The parameter as it appears at the method's service signature.
        * @param    original
        *           The original method's parameters.
        * @param    arg
        *           The initialized argument.
        * @param    i
        *           The parameter's index at the method's service signature.
        * @param    body
        *           The request body.
        * @param    request
        *           The request payload.
        *
        * @return   The parsed argument.
        */
       @Override
       public Object parseArgument(LegacyServiceParameter   lsp,
                                   LegacyServiceParameter[] original,
                                   Object                   arg,
                                   int                      i,
                                   String                   body,
                                   HttpServletRequest       request)
       throws IOException,
              RequestArgumentError
       {
          String ptype = lsp.type();
          int idx = lsp.ordinal() - 1;
          LegacyServiceParameter olsp = original[idx];

          if (olsp.extent() != SourceNameMapper.NO_EXTENT)
          {
             return serviceParser.parseExtentArgument(body, request, idx, lsp.source(), olsp.type(), olsp.extent());
          }

          String sval = serviceParser.parseArgumentInt(body, lsp.source(), request);

          if ("TABLE".equalsIgnoreCase(ptype))
          {
             return serviceParser.loadTable(sval);
          }

          if ("TABLE-HANDLE".equalsIgnoreCase(ptype))
          {
             TableWrapper wrapper = serviceParser.loadTable(sval);
             wrapper.setTableHandle(true);
             return wrapper;
          }

          if ("DATASET".equalsIgnoreCase(ptype))
          {
             return serviceParser.loadDataSet(sval);
          }

          if ("DATASET-HANDLE".equalsIgnoreCase(ptype))
          {
             DatasetWrapper wrapper = serviceParser.loadDataSet(sval);
             wrapper.setDatasetHandle(true);
             return wrapper;
          }

          if (arg instanceof MemoryBuffer)
          {
             ((MemoryBuffer) arg).setValue(Base64.safeBase64ToByteArray(sval));
             return arg;
          }

          BaseDataType bdt = (BaseDataType) arg;

          if (sval == null)
          {
             bdt.setUnknown();
          }
          else
          {
             try
             {
                serviceParser.assignArgument(i, bdt, sval);
             }
             catch (RequestArgumentError e)
             {
                throw e;
             }
             catch (Throwable t)
             {
                serviceParser.notAValue(bdt, sval);
                // don't return anything, notAValue will throw RequestArgumentError
             }
          }

          return arg;
       }
    }