141 lines
4.0 KiB
Java
141 lines
4.0 KiB
Java
/* GenerateIdFunction.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.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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import javax.xml.namespace.QName;
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import javax.xml.xpath.XPathFunction;
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import javax.xml.xpath.XPathFunctionException;
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import org.w3c.dom.Node;
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import gnu.xml.xpath.Expr;
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import gnu.xml.xpath.Function;
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/**
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* The XSLT <code>generate-id()</code>function.
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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 GenerateIdFunction
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extends Expr
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implements XPathFunction, Function
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{
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List args;
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public Object evaluate(List args)
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throws XPathFunctionException
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{
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// Useless...
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return Collections.EMPTY_SET;
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}
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public void setArguments(List args)
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{
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this.args = args;
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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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int arity = args.size();
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List values = new ArrayList(arity);
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for (int i = 0; i < arity; i++)
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{
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Expr arg = (Expr) args.get(i);
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values.add(arg.evaluate(context, pos, len));
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}
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Node node;
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Collection ns = (arity == 0) ? Collections.EMPTY_SET :
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(Collection) values.get(0);
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if (ns.isEmpty())
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{
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node = context;
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}
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else
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{
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List list = new ArrayList(ns);
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Collections.sort(list, documentOrderComparator);
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node = (Node) list.get(0);
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}
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String name = node.getNodeName();
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int index = 0, depth = 0;
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for (Node ctx = node.getPreviousSibling(); ctx != null;
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ctx = ctx.getPreviousSibling())
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{
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index++;
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}
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for (Node ctx = node.getParentNode(); ctx != null;
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ctx = ctx.getParentNode())
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{
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depth++;
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}
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return name + "-" + index + "-" + depth;
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}
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public Expr clone(Object context)
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{
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GenerateIdFunction f = new GenerateIdFunction();
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int len = args.size();
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List args2 = new ArrayList(len);
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for (int i = 0; i < len; i++)
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{
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args2.add(((Expr) args.get(i)).clone(context));
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}
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f.setArguments(args2);
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return f;
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}
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public boolean references(QName var)
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{
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for (Iterator i = args.iterator(); i.hasNext(); )
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{
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if (((Expr) i.next()).references(var))
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{
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return true;
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}
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}
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return false;
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}
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}
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