--- /dev/null
+/* ParameterNode.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.transform;
+
+import java.util.Collections;
+import javax.xml.namespace.QName;
+import javax.xml.transform.TransformerException;
+import org.w3c.dom.Document;
+import org.w3c.dom.DocumentFragment;
+import org.w3c.dom.Node;
+import gnu.xml.xpath.Expr;
+
+/**
+ * A template node that sets a variable or parameter during template
+ * processing.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+final class ParameterNode
+ extends TemplateNode
+ implements Comparable
+{
+
+ final QName name;
+ final Expr select;
+ final int type;
+
+ ParameterNode(QName name, Expr select, int type)
+ {
+ this.name = name;
+ this.select = select;
+ this.type = type;
+ }
+
+ TemplateNode clone(Stylesheet stylesheet)
+ {
+ TemplateNode ret = new ParameterNode(name,
+ select.clone(stylesheet),
+ type);
+ if (children != null)
+ {
+ ret.children = children.clone(stylesheet);
+ }
+ if (next != null)
+ {
+ ret.next = next.clone(stylesheet);
+ }
+ return ret;
+ }
+
+ void doApply(Stylesheet stylesheet, QName mode,
+ Node context, int pos, int len,
+ Node parent, Node nextSibling)
+ throws TransformerException
+ {
+ // push the variable context
+ stylesheet.bindings.push(type);
+ // set the variable
+ Object value = getValue(stylesheet, mode, context, pos, len);
+ if (value != null)
+ {
+ stylesheet.bindings.set(name, value, type);
+ if (stylesheet.debug)
+ {
+ System.err.println(this + ": set to " + value);
+ }
+ }
+ // variable and param don't process children as such
+ // all subsequent instructions are processed with that variable context
+ if (next != null)
+ {
+ next.apply(stylesheet, mode,
+ context, pos, len,
+ parent, nextSibling);
+ }
+ // pop the variable context
+ stylesheet.bindings.pop(type);
+ }
+
+ Object getValue(Stylesheet stylesheet, QName mode,
+ Node context, int pos, int len)
+ throws TransformerException
+ {
+ if (select != null)
+ {
+ return select.evaluate(context, pos, len);
+ }
+ else if (children != null)
+ {
+ Document doc = (context instanceof Document) ? (Document) context :
+ context.getOwnerDocument();
+ DocumentFragment fragment = doc.createDocumentFragment();
+ children.apply(stylesheet, mode, context, pos, len, fragment, null);
+ return Collections.singleton(fragment);
+ }
+ else
+ {
+ return null;
+ }
+ }
+
+ public boolean references(QName var)
+ {
+ if (select != null && select.references(var))
+ {
+ return true;
+ }
+ return super.references(var);
+ }
+
+ public int compareTo(Object other)
+ {
+ if (other instanceof ParameterNode)
+ {
+ ParameterNode pn = (ParameterNode) other;
+ boolean r1 = references(pn.name);
+ boolean r2 = pn.references(name);
+ if (r1 && r2)
+ {
+ throw new IllegalArgumentException("circular definitions");
+ }
+ if (r1)
+ {
+ return 1;
+ }
+ if (r2)
+ {
+ return -1;
+ }
+ }
+ return 0;
+ }
+
+ public String toString()
+ {
+ StringBuffer buf = new StringBuffer(getClass().getName());
+ buf.append('[');
+ buf.append("name=");
+ buf.append(name);
+ if (select != null)
+ {
+ buf.append(",select=");
+ buf.append(select);
+ }
+ buf.append(",type=");
+ switch (type)
+ {
+ case Bindings.VARIABLE:
+ buf.append("variable");
+ break;
+ case Bindings.PARAM:
+ buf.append("param");
+ break;
+ case Bindings.WITH_PARAM:
+ buf.append("with-param");
+ break;
+ }
+ buf.append(']');
+ return buf.toString();
+ }
+
+}
+
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