| /* FunctionCall.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.xpath; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| import javax.xml.namespace.QName; |
| import javax.xml.xpath.XPathFunction; |
| import javax.xml.xpath.XPathFunctionException; |
| import javax.xml.xpath.XPathFunctionResolver; |
| import org.w3c.dom.Node; |
| |
| /** |
| * Executes an XPath core or extension function. |
| * |
| * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> |
| */ |
| public final class FunctionCall |
| extends Expr |
| { |
| |
| final XPathFunctionResolver resolver; |
| final String name; |
| final List args; |
| |
| public FunctionCall(XPathFunctionResolver resolver, String name) |
| { |
| this(resolver, name, Collections.EMPTY_LIST); |
| } |
| |
| public FunctionCall(XPathFunctionResolver resolver, String name, List args) |
| { |
| this.resolver = resolver; |
| this.name = name; |
| this.args = args; |
| } |
| |
| public Object evaluate(Node context, int pos, int len) |
| { |
| if (resolver != null) |
| { |
| QName qname = QName.valueOf(name); |
| int arity = args.size(); |
| XPathFunction function = resolver.resolveFunction(qname, arity); |
| if (function != null) |
| { |
| //System.err.println("Calling "+toString()+" with "+values); |
| if (function instanceof Expr) |
| { |
| if (function instanceof Function) |
| { |
| ((Function) function).setArguments(args); |
| } |
| return ((Expr) function).evaluate(context, pos, len); |
| } |
| else |
| { |
| List values = new ArrayList(arity); |
| for (int i = 0; i < arity; i++) |
| { |
| Expr arg = (Expr) args.get(i); |
| values.add(arg.evaluate(context, pos, len)); |
| } |
| try |
| { |
| return function.evaluate(values); |
| } |
| catch (XPathFunctionException e) |
| { |
| e.printStackTrace(System.err); // FIXME |
| throw new RuntimeException(e.getMessage(), e); |
| } |
| } |
| } |
| } |
| throw new IllegalArgumentException("Invalid function call: " + |
| toString()); |
| } |
| |
| public Expr clone(Object context) |
| { |
| int len = args.size(); |
| List args2 = new ArrayList(len); |
| for (int i = 0; i < len; i++) |
| { |
| args2.add(((Expr) args.get(i)).clone(context)); |
| } |
| XPathFunctionResolver r = resolver; |
| if (context instanceof XPathFunctionResolver) |
| { |
| r = (XPathFunctionResolver) context; |
| } |
| return new FunctionCall(r, name, args2); |
| } |
| |
| public boolean references(QName var) |
| { |
| for (Iterator i = args.iterator(); i.hasNext(); ) |
| { |
| if (((Expr) i.next()).references(var)) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public String toString() |
| { |
| StringBuffer buf = new StringBuffer(); |
| buf.append(name); |
| buf.append('('); |
| int len = args.size(); |
| for (int i = 0; i < len; i++) |
| { |
| if (i > 0) |
| { |
| buf.append(','); |
| } |
| buf.append(args.get(i)); |
| } |
| buf.append(')'); |
| return buf.toString(); |
| } |
| |
| } |