65 lines
2.3 KiB
Java
65 lines
2.3 KiB
Java
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//This file is part of SECONDO.
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//Copyright (C) 2004, University in Hagen, Department of Computer Science,
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//Database Systems for New Applications.
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//SECONDO is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//SECONDO is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//You should have received a copy of the GNU General Public License
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//along with SECONDO; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package viewer.hoese.algebras;
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import sj.lang.ListExpr;
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import viewer.hoese.*;
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public class Dsplrational extends DsplGeneric {
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// returns a string representing this rational or "ERROR" if
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// the format of the list is wrong
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private String getValueString(ListExpr value){
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int len = value.listLength();
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if(len!=4 && len !=5)
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return "ERROR";
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String result="";
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if(value.listLength()==5){ // with sign
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ListExpr SignList = value.first();
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if(SignList.atomType()!=ListExpr.SYMBOL_ATOM)
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return "ERROR";
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String sign = SignList.symbolValue();
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if(sign.equals("-")) // ignore other values
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result += sign +" ";
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value = value.rest(); // skip the signum
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}
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// check the types
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if( value.first().atomType()!=ListExpr.INT_ATOM ||
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value.second().atomType()!=ListExpr.INT_ATOM ||
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value.fourth().atomType()!=ListExpr.INT_ATOM)
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return "ERROR";
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int intPart = value.first().intValue();
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int numDecimal = value.second().intValue();
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int denomDecimal = value.fourth().intValue();
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result += ""+(denomDecimal*intPart+numDecimal) + " / " + denomDecimal;
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return result;
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}
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public void init (String name, int nameWidth, int indent,
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ListExpr type, ListExpr value, QueryResult qr)
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{
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String T = name;
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String V = getValueString(value);
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T=extendString(T,nameWidth, indent);
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qr.addEntry(T + " : " + V);
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return;
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}
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}
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