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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [gnu/] [xml/] [xpath/] [BooleanFunction.java] - Blame information for rev 769

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1 769 jeremybenn
/* BooleanFunction.java --
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   Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath 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, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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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 GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.xml.xpath;
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import java.util.List;
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import javax.xml.namespace.QName;
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import org.w3c.dom.Node;
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/**
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 * The <code>boolean</code> function converts its argument to a boolean as
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 * follows:
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 * <ul>
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 * <li>a number is true if and only if it is neither positive or negative
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 * zero nor NaN</li>
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 * <li>a node-set is true if and only if it is non-empty</li>
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 * <li>a string is true if and only if its length is non-zero</li>
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 * <li>an object of a type other than the four basic types is converted to a
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 * boolean in a way that is dependent on that type</li>
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 * </ul>
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 *
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 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
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 */
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final class BooleanFunction
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  extends Expr
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{
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  final Expr arg;
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  BooleanFunction(List<Expr> args)
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  {
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    this(args.get(0));
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  }
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  BooleanFunction(Expr arg)
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  {
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    this.arg = arg;
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  }
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  public Object evaluate(Node context, int pos, int len)
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  {
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    Object val = arg.evaluate(context, pos, len);
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    return _boolean(context, val) ? Boolean.TRUE : Boolean.FALSE;
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  }
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  public Expr clone(Object context)
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  {
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    return new BooleanFunction(arg.clone(context));
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  }
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  public boolean references(QName var)
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  {
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    return arg.references(var);
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  }
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  public String toString()
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  {
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    return "boolean(" + arg + ")";
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  }
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}

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