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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  class ParameterExtractor extends DataExtractor
26  {
27      final String name;
28      final Class<?> type;
29      final boolean optional;
30      final String description;
31      final TypeCaster caster;
32  
33      ParameterExtractor( TypeCaster caster, Class<?> type, Parameter param,
34                          Description description )
35      {
36          this.caster = caster;
37          this.type = type;
38          this.name = param.name();
39          this.optional = param.optional();
40          this.description = description == null ? "" : description.value();
41      }
42  
43      @Override
44      Object extract( AbstractGraphDatabase graphDb, Object source, ParameterList parameters )
45              throws BadInputException
46      {
47          Object result = caster.get( graphDb, parameters, name );
48          if ( optional || result != null ) return result;
49          throw new IllegalArgumentException( "Mandatory argument \"" + name + "\" not supplied." );
50      }
51  
52      @Override
53      void describe( ParameterDescriptionConsumer consumer )
54      {
55          consumer.describeParameter( name, type, optional, description );
56      }
57  }