/**
* AnalyzerBeans
* Copyright (C) 2014 Neopost - Customer Information Management
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.eobjects.analyzer.data;
/**
* Defines an InputColumn which has a fixed/constant value, regardless of the
* row.
*
* These columns can be used for various purposes, eg. to mark a filter outcome
* in the data, to open jobs as templates, even though the new datastore is
* missing some columns etc.
*/
public final class ConstantInputColumn extends AbstractExpressionBasedInputColumn<String> {
private static final long serialVersionUID = 1L;
private final String _value;
public ConstantInputColumn(String value) {
super();
if (value == null) {
throw new IllegalArgumentException("value cannot be null");
}
_value = value;
}
@Override
public String getExpression() {
return _value;
}
@Override
public String evaluate(InputRow row) {
return _value;
}
@Override
public Class<? extends String> getDataType() {
return String.class;
}
}