/*
* 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;
import org.supercsv.cellprocessor.ift.BoolCellProcessor;
import org.supercsv.cellprocessor.ift.CellProcessor;
import org.supercsv.cellprocessor.ift.DateCellProcessor;
import org.supercsv.cellprocessor.ift.DoubleCellProcessor;
import org.supercsv.cellprocessor.ift.LongCellProcessor;
import org.supercsv.cellprocessor.ift.StringCellProcessor;
import org.supercsv.exception.SuperCsvCellProcessorException;
import org.supercsv.util.CsvContext;
/**
* This processor is used in the situations you want to be able to check for the presence of a "special
* token". Such a token could be the string "[empty]" which could denote that a column is different from the empty
* string "".
* <p>
* For example, to convert the String <tt>"[empty]"</tt> to -1 (an int representing 'empty') you could use <code>
* new Token("[empty]", -1)
* </code>
* <p>
* Comparison between the input and the <tt>token</tt> is based on the object's <tt>equals()</tt> method.
*
* @since 1.02
* @author Kasper B. Graversen
*/
public class Token extends CellProcessorAdaptor implements BoolCellProcessor, DateCellProcessor, DoubleCellProcessor,
LongCellProcessor, StringCellProcessor {
private final Object returnValue;
private final Object token;
/**
* Constructs a new <tt>Token</tt> processor, which returns the supplied value if the token is encountered,
* otherwise it returns the input unchanged.
*
* @param token
* the token
* @param returnValue
* the value to return if the token is encountered
*/
public Token(final Object token, final Object returnValue) {
super();
this.token = token;
this.returnValue = returnValue;
}
/**
* Constructs a new <tt>Token</tt> processor, which returns the supplied value if the token is encountered,
* otherwise it passes the input unchanged to the next processor in the chain.
*
* @param token
* the token
* @param returnValue
* the value to return if the token is encountered
* @param next
* the next processor in the chain
* @throws NullPointerException
* if next is null
*/
public Token(final Object token, final Object returnValue, final CellProcessor next) {
super(next);
this.token = token;
this.returnValue = returnValue;
}
/**
* {@inheritDoc}
*
* @throws SuperCsvCellProcessorException
* if value is null
*/
public Object execute(final Object value, final CsvContext context) {
validateInputNotNull(value, context);
if( value.equals(token) ) {
return returnValue;
}
return next.execute(value, context);
}
}
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