125 lines
4.1 KiB
Java
125 lines
4.1 KiB
Java
/* XSLComparator.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.transform;
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import java.util.Comparator;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Locale;
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import java.text.Collator;
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import org.w3c.dom.Node;
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import gnu.xml.xpath.Expr;
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/**
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* Comparator for sorting lists of nodes according to a list of sort keys.
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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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class XSLComparator
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implements Comparator
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{
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final List sortKeys;
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XSLComparator(List sortKeys)
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{
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this.sortKeys = sortKeys;
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}
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public int compare(Object o1, Object o2)
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{
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if (o1 instanceof Node && o2 instanceof Node)
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{
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Node n1 = (Node) o1;
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Node n2 = (Node) o2;
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for (Iterator i = sortKeys.iterator(); i.hasNext(); )
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{
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SortKey sortKey = (SortKey) i.next();
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String k1 = sortKey.key(n1);
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String k2 = sortKey.key(n2);
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if ("text".equals(sortKey.dataType))
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{
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Locale locale = (sortKey.lang == null) ? Locale.getDefault() :
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new Locale(sortKey.lang);
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Collator collator = Collator.getInstance(locale);
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int d = collator.compare(k1, k2);
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if (d != 0)
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{
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switch (sortKey.caseOrder)
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{
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case SortKey.UPPER_FIRST:
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// TODO
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break;
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case SortKey.LOWER_FIRST:
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// TODO
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break;
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}
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if (sortKey.descending)
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{
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d = -d;
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}
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return d;
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}
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}
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else if ("number".equals(sortKey.dataType))
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{
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double kn1 = Expr._number(n1, k1);
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double kn2 = Expr._number(n2, k2);
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int d;
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if (Double.isNaN(kn1) || Double.isInfinite(kn2))
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{
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d = -1;
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}
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else if (Double.isNaN(kn2) || Double.isInfinite(kn1))
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{
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d = 1;
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}
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else
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{
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// conversion to int may give 0 for small numbers
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d = (kn1 > kn2) ? 1 : (kn1 < kn2) ? -1 : 0;
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}
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return (sortKey.descending) ? -d : d;
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}
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}
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}
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return 0;
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}
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}
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