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-/* NormalizeSpaceFunction.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 java.util.StringTokenizer;
-import org.w3c.dom.Node;
-
-/**
- * The <code>normalize-space</code> function returns the argument string
- * with whitespace normalized by stripping leading and trailing whitespace
- * and replacing sequences of whitespace characters by a single space.
- * Whitespace characters are the same as those allowed by the S production
- * in XML. If the argument is omitted, it defaults to the context node
- * converted to a string, in other words the string-value of the context
- * node.
- *
- * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
- */
-final class NormalizeSpaceFunction
- extends Expr
-{
-
- final Expr arg;
-
- NormalizeSpaceFunction(List args)
- {
- this((Expr) args.get(0));
- }
-
- NormalizeSpaceFunction(Expr arg)
- {
- this.arg = arg;
- }
-
- public Object evaluate(Node context, int pos, int len)
- {
- Object val = (arg == null) ? null : arg.evaluate(context, pos, len);
- String s = _string(context, val);
- StringTokenizer st = new StringTokenizer(s, " \t\r\n");
- StringBuffer buf = new StringBuffer();
- if (st.hasMoreTokens())
- {
- buf.append(st.nextToken());
- while (st.hasMoreTokens())
- {
- buf.append(' ');
- buf.append(st.nextToken());
- }
- }
- return buf.toString();
- }
-
- public Expr clone(Object context)
- {
- return new NormalizeSpaceFunction(arg.clone(context));
- }
-
- public String toString()
- {
- return (arg == null) ? "normalize-space()" : "normalize-space(" + arg + ")";
- }
-
-}