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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  }