| /* ParameterNode.java -- |
| Copyright (C) 2004,2006 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(); |
| 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('['); |
| buf.append("name="); |
| buf.append(name); |
| if (select != null) |
| { |
| buf.append(",select="); |
| buf.append(select); |
| } |
| buf.append(']'); |
| return buf.toString(); |
| } |
| |
| } |
| |