gomp-20050608-branch/libjava/classpath/gnu/xml/transform/FormatNumberFunction.java

   1 /* FormatNumberFunction.java --
   2    Copyright (C) 2004 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38 package gnu.xml.transform;
  39
  40 import java.text.DecimalFormat;
  41 import java.util.ArrayList;
  42 import java.util.Collections;
  43 import java.util.Iterator;
  44 import java.util.List;
  45 import javax.xml.namespace.QName;
  46 import javax.xml.xpath.XPathFunction;
  47 import javax.xml.xpath.XPathFunctionException;
  48 import org.w3c.dom.Node;
  49 import gnu.xml.xpath.Expr;
  50 import gnu.xml.xpath.Function;
  51
  52 /**
  53  * The XSLT <code>format-number()</code>function.
  54  *
  55  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  56  */
  57 final class FormatNumberFunction
  58   extends Expr
  59   implements XPathFunction, Function
  60 {
  61
  62   final Stylesheet stylesheet;
  63   List args;
  64
  65   FormatNumberFunction(Stylesheet stylesheet)
  66   {
  67     this.stylesheet = stylesheet;
  68   }
  69
  70   public Object evaluate(List args)
  71     throws XPathFunctionException
  72   {
  73     // Useless...
  74     return Collections.EMPTY_SET;
  75   }
  76
  77   public void setArguments(List args)
  78   {
  79     this.args = args;
  80   }
  81
  82   public Object evaluate(Node context, int pos, int len)
  83   {
  84     int arity = args.size();
  85     List values = new ArrayList(arity);
  86     for (int i = 0; i < arity; i++)
  87       {
  88         Expr arg = (Expr) args.get(i);
  89         values.add(arg.evaluate(context, pos, len));
  90       }
  91     double number = _number(context, values.get(0));
  92     String pattern = _string(context, values.get(1));
  93     // Currency symbol &#x00a4; is not supposed to be present
  94     if (pattern.indexOf('\u00a4') != -1)
  95       {
  96         // Replace with $ (Xalan does this)
  97         pattern = pattern.replace('\u00a4', '$');
  98       }
  99     String dfName = null;
 100     if (arity > 2)
 101       {
 102         dfName = _string(context, values.get(2));
 103         // otherwise the default decimal-format will be used
 104       }
 105     DecimalFormat df = (DecimalFormat) stylesheet.decimalFormats.get(dfName);
 106     if (df == null)
 107       {
 108         throw new IllegalArgumentException("No such decimal-format: " +
 109                                            dfName);
 110       }
 111     df.applyLocalizedPattern(pattern);
 112     return df.format(number);
 113   }
 114
 115   public Expr clone(Object context)
 116   {
 117     Stylesheet s = stylesheet;
 118     if (context instanceof Stylesheet)
 119       {
 120         s = (Stylesheet) context;
 121       }
 122     FormatNumberFunction f = new FormatNumberFunction(s);
 123     int len = args.size();
 124     List args2 = new ArrayList(len);
 125     for (int i = 0; i < len; i++)
 126       {
 127         args2.add(((Expr) args.get(i)).clone(context));
 128       }
 129     f.setArguments(args2);
 130     return f;
 131   }
 132
 133   public boolean references(QName var)
 134   {
 135     for (Iterator i = args.iterator(); i.hasNext(); )
 136       {
 137         if (((Expr) i.next()).references(var))
 138           {
 139             return true;
 140           }
 141       }
 142     return false;
 143   }
 144
 145 }
 146