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*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
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* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
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* version 3 along with OpenOffice.org. If not, see
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* for a copy of the LGPLv3 License.
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************************************************************************/
package org.openoffice.xmerge.converter.xml.sxc.pexcel.records.formula;
import java.util.HashMap;
/**
* This class defines the precedence applied to each operator when performing a conversion
* {@link org.openoffice.xmerge.converter.xml.sxc.pexcel.Records.formula.FormulaCompiler.infix2 from infix to RPN.}.
*/
public class PrecedenceTable {
public static final int DEFAULT_PRECEDENCE = 0;
public static final int EQNEQ_PRECEDENCE = 1; // =, <>
public static final int GTLTEQ_PRECEDENCE = 1; // >=, <=
public static final int GTLT_PRECEDENCE = 2; // >, <
public static final int ADDOP_PRECEDENCE = 4; // +, -
public static final int MULTOP_PRECEDENCE = 5; // *, /
public static final int FACTOR_PRECEDENCE = 6; // ^
public static final int CONCAT_PRECEDENCE = 6; // &
public static final int UNARY_PRECEDENCE = 7; // !, Unary +, Unary -
public static final int PAREN_PRECEDENCE = 8; // (, )
public static final int FUNCTION_PRECEDENCE = 8;
public static final int COMMA_PRECEDENCE = 8;
private static HashMap map;
static {
map = new HashMap();
map.put("%", new Integer(UNARY_PRECEDENCE));
map.put("+", new Integer(ADDOP_PRECEDENCE));
map.put("-", new Integer(ADDOP_PRECEDENCE));
map.put("*", new Integer(MULTOP_PRECEDENCE));
map.put("/", new Integer(MULTOP_PRECEDENCE));
map.put("(", new Integer(PAREN_PRECEDENCE));
map.put(")", new Integer(PAREN_PRECEDENCE));
map.put(",", new Integer(COMMA_PRECEDENCE));
map.put(">", new Integer(GTLT_PRECEDENCE));
map.put("<", new Integer(GTLT_PRECEDENCE));
map.put("=", new Integer(EQNEQ_PRECEDENCE));
map.put("&", new Integer(CONCAT_PRECEDENCE));
map.put("^", new Integer(FACTOR_PRECEDENCE));
map.put(">=", new Integer(GTLTEQ_PRECEDENCE));
map.put("<=", new Integer(GTLTEQ_PRECEDENCE));
map.put("<>", new Integer(EQNEQ_PRECEDENCE));
map.put("FUNCTION", new Integer(FUNCTION_PRECEDENCE));
}
/**
* Retrieve the precedence value for a given operator.
* @param op Look up the precedence for this operator
* @return an integer representing the integer value of the operator
*/
public static int getPrecedence(String op) {
Object obj = map.get(op);
if (obj == null) {
return DEFAULT_PRECEDENCE;
}
return ((Integer)obj).intValue();
}
}
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