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-/* BooleanFunction.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., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 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>boolean</code> function converts its argument to a boolean as
- * follows:
- * <ul>
- * <li>a number is true if and only if it is neither positive or negative
- * zero nor NaN</li>
- * <li>a node-set is true if and only if it is non-empty</li>
- * <li>a string is true if and only if its length is non-zero</li>
- * <li>an object of a type other than the four basic types is converted to a
- * boolean in a way that is dependent on that type</li>
- * </ul>
- *
- * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
- */
-final class BooleanFunction
- extends Expr
-{
-
- final Expr arg;
-
- BooleanFunction(List args)
- {
- this((Expr) args.get(0));
- }
-
- BooleanFunction(Expr arg)
- {
- this.arg = arg;
- }
-
- public Object evaluate(Node context, int pos, int len)
- {
- Object val = arg.evaluate(context, pos, len);
- return _boolean(context, val) ? Boolean.TRUE : Boolean.FALSE;
- }
-
- public Expr clone(Object context)
- {
- return new BooleanFunction(arg.clone(context));
- }
-
- public String toString()
- {
- return "boolean(" + arg + ")";
- }
-
-}