180 lines
5.3 KiB
Java
180 lines
5.3 KiB
Java
/* SortKey.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 javax.xml.namespace.QName;
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import javax.xml.transform.TransformerException;
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import org.w3c.dom.Document;
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import org.w3c.dom.DocumentFragment;
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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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* An XSL sort key.
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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 SortKey
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{
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static final int DEFAULT = 0;
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static final int UPPER_FIRST = 1;
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static final int LOWER_FIRST = 2;
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final Expr select;
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final TemplateNode langTemplate;
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final TemplateNode dataTypeTemplate;
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final TemplateNode orderTemplate;
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final TemplateNode caseOrderTemplate;
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transient String lang;
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transient String dataType;
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transient boolean descending;
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transient int caseOrder;
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SortKey(Expr select, TemplateNode lang, TemplateNode dataType,
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TemplateNode order, TemplateNode caseOrder)
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{
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this.select = select;
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this.langTemplate = lang;
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this.dataTypeTemplate = dataType;
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this.orderTemplate = order;
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this.caseOrderTemplate = caseOrder;
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}
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String key(Node node)
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{
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Object ret = select.evaluate(node, 1, 1);
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if (ret instanceof String)
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{
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return (String) ret;
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}
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else
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{
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return Expr._string(node, ret);
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}
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}
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/**
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* Prepare for a sort.
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* This sets all transient variables from their AVTs.
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*/
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void init(Stylesheet stylesheet, QName mode,
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Node context, int pos, int len,
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Node parent, Node nextSibling)
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throws TransformerException
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{
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Document doc = (context instanceof Document) ? (Document) context :
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context.getOwnerDocument();
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if (langTemplate == null)
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{
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lang = null;
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}
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else
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{
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DocumentFragment fragment = doc.createDocumentFragment();
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langTemplate.apply(stylesheet, mode, context, pos, len,
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fragment, null);
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lang = Expr.stringValue(fragment);
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}
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if (dataTypeTemplate == null)
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{
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dataType = "text";
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}
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else
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{
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DocumentFragment fragment = doc.createDocumentFragment();
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dataTypeTemplate.apply(stylesheet, mode, context, pos, len,
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fragment, null);
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dataType = Expr.stringValue(fragment);
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}
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if (orderTemplate == null)
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{
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descending = false;
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}
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else
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{
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DocumentFragment fragment = doc.createDocumentFragment();
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orderTemplate.apply(stylesheet, mode, context, pos, len,
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fragment, null);
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String order = Expr.stringValue(fragment);
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descending = "descending".equals(order);
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}
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if (caseOrderTemplate == null)
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{
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caseOrder = DEFAULT;
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}
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else
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{
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DocumentFragment fragment = doc.createDocumentFragment();
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caseOrderTemplate.apply(stylesheet, mode, context, pos, len,
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fragment, null);
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String co = Expr.stringValue(fragment);
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caseOrder = "upper-first".equals(co) ? UPPER_FIRST :
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"lower-first".equals(co) ? LOWER_FIRST :
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DEFAULT;
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}
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}
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boolean references(QName var)
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{
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if (select != null && select.references(var))
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{
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return true;
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}
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if (langTemplate != null && langTemplate.references(var))
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{
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return true;
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}
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if (dataTypeTemplate != null && dataTypeTemplate.references(var))
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{
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return true;
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}
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if (orderTemplate != null && orderTemplate.references(var))
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{
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return true;
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}
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if (caseOrderTemplate != null && caseOrderTemplate.references(var))
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{
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return true;
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}
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return false;
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}
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}
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