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    1   /**
    2    * Copyright (c) 2002-2011 "Neo Technology,"
    3    * Network Engine for Objects in Lund AB [http://neotechnology.com]
    4    *
    5    * This file is part of Neo4j.
    6    *
    7    * Neo4j is free software: you can redistribute it and/or modify
    8    * it under the terms of the GNU General Public License as published by
    9    * the Free Software Foundation, either version 3 of the License, or
    10   * (at your option) any later version.
    11   *
    12   * This program is distributed in the hope that it will be useful,
    13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    15   * GNU General Public License for more details.
    16   *
    17   * You should have received a copy of the GNU General Public License
    18   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    19   */
    20  package org.neo4j.server.plugins;
    21
    22  import org.neo4j.kernel.AbstractGraphDatabase;
    23  import org.neo4j.server.rest.repr.BadInputException;
    24
    25  abstract class ListParameterExtractor extends ParameterExtractor
    26  {
    27      ListParameterExtractor( TypeCaster caster, Class<?> type, Parameter param,
    28                              Description description )
    29      {
    30          super( caster, type, param, description );
    31      }
    32
    33      @Override
    34      Object extract( AbstractGraphDatabase graphDb, Object source, ParameterList parameters )
    35              throws BadInputException
    36      {
    37          Object[] result = caster.getList( graphDb, parameters, name );
    38          if ( result != null )
    39          {
    40              if ( type.isPrimitive() ) return caster.convert( result );
    41              return convert( result );
    42          }
    43          if ( optional ) return null;
    44          throw new IllegalArgumentException( "Mandatory argument \"" + name + "\" not supplied." );
    45      }
    46
    47      abstract Object convert( Object[] result );
    48
    49      @Override
    50      void describe( ParameterDescriptionConsumer consumer )
    51      {
    52          consumer.describeListParameter( name, type, optional, description );
    53      }
    54  }