001/*
002 * Copyright (c) 2007-2017 Xplenty, 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
021package cascading.operation.assertion;
022
023import cascading.flow.FlowProcess;
024import cascading.operation.ValueAssertion;
025import cascading.operation.ValueAssertionCall;
026import cascading.tuple.Tuple;
027import cascading.tuple.TupleEntry;
028
029/** Class AssertNull asserts that every value in the argument values {@link Tuple} is a null value. */
030public class AssertNull extends BaseAssertion implements ValueAssertion
031  {
032  /** Constructor AssertNull creates a new AssertNull instance. */
033  public AssertNull()
034    {
035    super( "argument '%s' value was not null, in tuple: %s" );
036    }
037
038  @Override
039  public void doAssert( FlowProcess flowProcess, ValueAssertionCall assertionCall )
040    {
041    TupleEntry input = assertionCall.getArguments();
042    int pos = 0;
043
044    for( Object value : input.getTuple() )
045      {
046      if( value != null )
047        fail( input.getFields().get( pos ), input.getTuple().print() );
048
049      pos++;
050      }
051    }
052  }