View Javadoc

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  }