/*
* Copyright (c) 2006-2009 by Abacus Research AG, Switzerland.
* All rights reserved.
*
* This file is part of the Abacus Formula Compiler (AFC).
*
* For commercial licensing, please contact sales(at)formulacompiler.com.
*
* AFC is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* AFC 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with AFC. If not, see <http://www.gnu.org/licenses/>.
*/
package org.formulacompiler.compiler.internal.model.rewriting;
import org.formulacompiler.compiler.internal.expressions.ExpressionNode;
import org.formulacompiler.compiler.internal.expressions.ExpressionNodeForConstantValue;
import org.formulacompiler.compiler.internal.model.CellModel;
import org.formulacompiler.compiler.internal.model.ExpressionNodeForCellModel;
abstract class AbstractExpressionRewriter
{
private final NameSanitizer sanitizer;
public AbstractExpressionRewriter( NameSanitizer _sanitizer )
{
super();
this.sanitizer = _sanitizer;
}
protected final NameSanitizer sanitizer()
{
return this.sanitizer;
}
protected final String newSanitizingSuffix()
{
return this.sanitizer.newSanitizingSuffix();
}
protected static final Object NOT_CONST = new Object();
protected final Object constantValueOf( ExpressionNode _node )
{
if (_node instanceof ExpressionNodeForConstantValue) {
final ExpressionNodeForConstantValue constNode = (ExpressionNodeForConstantValue) _node;
return constNode.value();
}
else if (_node instanceof ExpressionNodeForCellModel) {
final ExpressionNodeForCellModel cellNode = (ExpressionNodeForCellModel) _node;
final CellModel cell = cellNode.getCellModel();
if (null == cell) {
return null;
}
else if (!cell.isInput()) {
if (null == cell.getExpression()) {
return cell.getConstantValue();
}
else {
return constantValueOf( cell.getExpression() );
}
}
}
return NOT_CONST;
}
protected final ExpressionNode expressionOf( ExpressionNode _node )
{
if (_node instanceof ExpressionNodeForCellModel) {
final ExpressionNodeForCellModel cellNode = (ExpressionNodeForCellModel) _node;
final CellModel cell = cellNode.getCellModel();
if (null != cell && !cell.isInput() && null != cell.getExpression()) {
return expressionOf( cell.getExpression() );
}
}
return _node;
}
}