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/************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: Token.java,v $
* $Revision: 1.3 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
package org.openoffice.xmerge.converter.xml.sxc.pexcel.records.formula;
import java.io.*;
/**
* A Token is the basic building block of any formula.
* A Token can be of four types (Operator, Operand, Function with fixed
* arguments and function with a variable number of arguments. Each type can
* have numerous id's. Thetypes are define in <code>ParseToken</code> and the
* id's are defined in <code>TokenConstants</code>. The other member variables
* are priority which is returned from the <code>PrecedenceTable</code>, the
* value which is the String equivalent of the token (eg. "+", "$A$12", "SUM")
* and the number of arguments which is only valid for operators and functions.
* Tokens should never be created directly and instead are created by the
* <code>TokenFactory</code>
*/
public class Token implements ParseToken {
private String value;
private int type; // operator, operand, function fixed, function variable
private int id; // cell reference, SUM, integer
private int priority;
private int numArgs=-1;
public Token(String op, int type, int id, int args) {
this.value = op;
this.type = type;
this.id = id;
this.numArgs = args;
if(type==ParseToken.TOKEN_FUNCTION_VARIABLE) {
priority = PrecedenceTable.getPrecedence("FUNCTION");
} else if(type==ParseToken.TOKEN_OPERATOR) {
priority = PrecedenceTable.getPrecedence(op);
} else {
priority = PrecedenceTable.getPrecedence("DEFAULT");
}
}
/**
* Checks if the current token is an operator
*
* @return A <code>boolean</code> result of the comaparison
*/
public boolean isOperator() {
return type == ParseToken.TOKEN_OPERATOR;
}
/**
* Checks if the current token is an operand
*
* @return A <code>boolean</code> result of the comaparison
*/
public boolean isOperand() {
return type == ParseToken.TOKEN_OPERAND;
}
/**
* Checks if the current token is a function
*
* @return A <code>boolean</code> result of the comaparison
*/
public boolean isFunction() {
return (type==ParseToken.TOKEN_FUNCTION_FIXED) || (type==ParseToken.TOKEN_FUNCTION_VARIABLE);
}
/**
* Returns the token type. This can be one of four values (TOKEN_OPERATOR,
* TOKEN_OPERAND, TOKEN_FUNCTION_FIXED, TOKEN_FUNCTION_VARIABLE) defined in
* <code>ParseToken</code>
*
* @return A <code>boolean</code> result of the comparison
*/
public int getTokenType() {
return type;
}
/**
* Returns the ID of this token. This ID is equivalent to the pexcel hex
* value and is defined in <code>ParseToken</code>
*
* @return Returns the id of this token
*/
public int getTokenID() {
return id;
}
/**
* Returns the <code>String</code> equivalent of this token
*
* @return The <code>String</code> representing this Token
*/
public String getValue() {
return value;
}
/**
* Returns the number of arguments if this token represents an operator or
* function. Otherwise returns -1.
*
* @return The number of arguments
*/
public int getNumArgs() {
return numArgs;
}
/**
* Checks if the current token is an operator
*
* @return A <code>boolean</code> result of the comparison
*/
public int getTokenPriority() {
return priority;
}
/**
* Returns the <code>String</code> equivalent of this token
*
* @return The <code>String</code> representing this Token
*/
public String toString() {
return getValue();
}
}
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