/libformula-1.1.3/source/org/pentaho/reporting/libraries/formula/function/logical/TrueFunction.java

 1/*
 2 * This program is free software; you can redistribute it and/or modify it under the
 3 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 4 * Foundation.
 5 *
 6 * You should have received a copy of the GNU Lesser General Public License along with this
 7 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 8 * or from the Free Software Foundation, Inc.,
 9 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
12 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13 * See the GNU Lesser General Public License for more details.
14 *
15 * Copyright (c) 2006 - 2009 Pentaho Corporation and Contributors.  All rights reserved.
16 */
17
18package org.pentaho.reporting.libraries.formula.function.logical;
19
20import org.pentaho.reporting.libraries.formula.EvaluationException;
21import org.pentaho.reporting.libraries.formula.FormulaContext;
22import org.pentaho.reporting.libraries.formula.LibFormulaErrorValue;
23import org.pentaho.reporting.libraries.formula.function.Function;
24import org.pentaho.reporting.libraries.formula.function.ParameterCallback;
25import org.pentaho.reporting.libraries.formula.lvalues.TypeValuePair;
26import org.pentaho.reporting.libraries.formula.typing.coretypes.LogicalType;
27
28/**
29 * Creation-Date: 04.11.2006, 18:28:15
30 *
31 * @author Thomas Morgner
32 */
33public class TrueFunction implements Function
34{
35  private static final TypeValuePair RETURN_TRUE = new TypeValuePair(LogicalType.TYPE, Boolean.TRUE);
36  private static final long serialVersionUID = 3103588076262714854L;
37
38  public TrueFunction()
39  {
40  }
41
42  public String getCanonicalName()
43  {
44    return "TRUE";
45  }
46
47  public TypeValuePair evaluate(final FormulaContext context,
48                                final ParameterCallback parameters) throws EvaluationException
49  {
50    if(parameters.getParameterCount() != 0)
51    {
52      throw EvaluationException.getInstance(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
53    }
54    return RETURN_TRUE;
55  }
56}