/*
* Copyright 2007 Kasper B. Graversen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.supercsv.cellprocessor.constraint;
import org.supercsv.cellprocessor.CellProcessorAdaptor;
import org.supercsv.cellprocessor.ift.CellProcessor;
import org.supercsv.cellprocessor.ift.StringCellProcessor;
import org.supercsv.exception.SuperCsvCellProcessorException;
import org.supercsv.exception.SuperCsvConstraintViolationException;
import org.supercsv.util.CsvContext;
/**
* This processor checks if the input is <tt>null</tt> or an empty string, and raises an exception in that case. In all
* other cases, the next processor in the chain is invoked.
* <p>
* You should only use this processor, when a column must be non-null, but you do not need to apply any other processor
* to the column.
* <p>
* If you apply other processors to the column, you can safely omit this processor as all other processors should do a
* null-check on its input.
*
* @since 1.50
* @author Dominique De Vito
*/
public class StrNotNullOrEmpty extends CellProcessorAdaptor implements StringCellProcessor {
/**
* Constructs a new <tt>StrNotNullOrEmpty</tt> processor, which checks for null/empty Strings.
*/
public StrNotNullOrEmpty() {
super();
}
/**
* Constructs a new <tt>StrNotNullOrEmpty</tt> processor, which checks for null/empty Strings, then calls the next
* processor in the chain.
*
* @param next
* the next processor in the chain
* @throws NullPointerException
* if next is null
*/
public StrNotNullOrEmpty(final CellProcessor next) {
super(next);
}
/**
* {@inheritDoc}
*
* @throws SuperCsvCellProcessorException
* if value is null or isn't a String
* @throws SuperCsvConstraintViolationException
* if value is an empty String
*/
public Object execute(final Object value, final CsvContext context) {
if (value == null){
throw new SuperCsvConstraintViolationException("the String should not be null", context, this);
}
if( value instanceof String ) {
final String stringValue = (String) value;
if( stringValue.length() == 0 ) {
throw new SuperCsvConstraintViolationException("the String should not be empty", context, this);
}
} else {
throw new SuperCsvCellProcessorException(String.class, value, context, this);
}
return next.execute(value, context);
}
}
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