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;
022    
023    /**
024     * Class FieldsResolverException is thrown when selectorFields cannot
025     * select from the sourceFields.
026     */
027    public class FieldsResolverException extends TupleException
028      {
029      /** Field sourceFields */
030      private final Fields sourceFields;
031      /** Field selectorFields */
032      private final Fields selectorFields;
033    
034      /**
035       * Constructor FieldsResolverException creates a new FieldsResolverException instance.
036       *
037       * @param sourceFields   of type Fields
038       * @param selectorFields of type Fields
039       */
040      public FieldsResolverException( Fields sourceFields, Fields selectorFields )
041        {
042        super( createMessage( sourceFields, selectorFields ) );
043    
044        this.sourceFields = sourceFields;
045        this.selectorFields = selectorFields;
046        }
047    
048      /**
049       * Method getSourceFields returns the sourceFields of this FieldsResolverException object.
050       *
051       * @return the sourceFields (type Fields) of this FieldsResolverException object.
052       */
053      public Fields getSourceFields()
054        {
055        return sourceFields;
056        }
057    
058      /**
059       * Method getSelectorFields returns the selectorFields of this FieldsResolverException object.
060       *
061       * @return the selectorFields (type Fields) of this FieldsResolverException object.
062       */
063      public Fields getSelectorFields()
064        {
065        return selectorFields;
066        }
067    
068      private static String createMessage( Fields sourceFields, Fields selectorFields )
069        {
070        return "could not select fields: " + selectorFields.printVerbose() + ", from: " + sourceFields.printVerbose();
071        }
072      }