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+/* StringFunction.java -- 
+   Copyright (C) 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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 2, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.xml.xpath;
+
+import java.util.List;
+import org.w3c.dom.Node;
+
+/**
+ * The <code>string function converts an object to a string as follows:
+ * <ul>
+ * <li>A node-set is converted to a string by returning the string-value of
+ * the node in the node-set that is first in document order. If the node-set
+ * is empty, an empty string is returned.</li>
+ * <li>A number is converted to a string as follows
+ * <ul>
+ * <li>NaN is converted to the string NaN</li>
+ * <li>positive zero is converted to the string 0</li>
+ * <li>negative zero is converted to the string 0</li>
+ * <li>positive infinity is converted to the string Infinity</li>
+ * <li>negative infinity is converted to the string -Infinity</li>
+ * <li>if the number is an integer, the number is represented in decimal
+ * form as a Number with no decimal point and no leading zeros, preceded by
+ * a minus sign (-) if the number is negative</li>
+ * <li>otherwise, the number is represented in decimal form as a Number
+ * including a decimal point with at least one digit before the decimal
+ * point and at least one digit after the decimal point, preceded by a minus
+ * sign (-) if the number is negative; there must be no leading zeros before
+ * the decimal point apart possibly from the one required digit immediately
+ * before the decimal point; beyond the one required digit after the decimal
+ * point there must be as many, but only as many, more digits as are needed
+ * to uniquely distinguish the number from all other IEEE 754 numeric
+ * values.</li>
+ * </ul>
+ * </li>
+ * <li>The boolean false value is converted to the string false. The boolean
+ * true value is converted to the string true.</li>
+ * <li>An object of a type other than the four basic types is converted to a
+ * string in a way that is dependent on that type.</li>
+ * </ul>
+ * If the argument is omitted, it defaults to a node-set with the context
+ * node as its only member.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+final class StringFunction
+  extends Expr
+{
+
+  final Expr arg;
+
+  StringFunction(List args)
+  {
+    this(args.size() > 0 ? (Expr) args.get(0) : null);
+  }
+  
+  StringFunction(Expr arg)
+  {
+    this.arg = arg;
+  }
+
+  public Object evaluate(Node context, int pos, int len)
+  {
+    Object val = (arg == null) ? null : arg.evaluate(context, pos, len);
+    return _string(context, val);
+  }
+
+  public Expr clone(Object context)
+  {
+    return new StringFunction((arg == null) ? null :
+                              arg.clone(context));
+  }
+
+  public String toString()
+  {
+    return (arg == null) ? "string()" : "string(" + arg + ")";
+  }
+  
+}