    001    /*
    002     * Copyright (c) 2007-2014 Concurrent, Inc. All Rights Reserved.
    003     *
    004     * Project and contact information: http://www.cascading.org/
    005     *
    006     * This file is part of the Cascading project.
    007     *
    008     * Licensed under the Apache License, Version 2.0 (the "License");
    009     * you may not use this file except in compliance with the License.
    010     * You may obtain a copy of the License at
    011     *
    012     *     http://www.apache.org/licenses/LICENSE-2.0
    013     *
    014     * Unless required by applicable law or agreed to in writing, software
    015     * distributed under the License is distributed on an "AS IS" BASIS,
    016     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    017     * See the License for the specific language governing permissions and
    018     * limitations under the License.
    019     */
    020
    021    package cascading.tuple.coerce;
    022
    023    import java.lang.reflect.Type;
    024    import java.util.Map;
    025
    026    /**
    027     *
    028     */
    029    public class LongObjectCoerce extends Coercions.Coerce<Long>
    030      {
    031      protected LongObjectCoerce( Map<Type, Coercions.Coerce> map )
    032        {
    033        super( map );
    034        }
    035
    036      @Override
    037      public Class<Long> getCanonicalType()
    038        {
    039        return Long.class;
    040        }
    041
    042      @Override
    043      public Long coerce( Object value )
    044        {
    045        if( value instanceof Number )
    046          return ( (Number) value ).longValue();
    047        else if( value == null || value.toString().isEmpty() )
    048          return null;
    049        else
    050          return Long.parseLong( value.toString() );
    051        }
    052      }