/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-07 The eXist Project
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* $Id$
*/
package org.exist.http.urlrewrite;
import org.w3c.dom.Element;
import org.exist.xquery.Expression;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.XPathException;
import org.exist.xquery.Module;
import org.exist.xquery.UserDefinedFunction;
import org.exist.xquery.ExternalModule;
import org.exist.xquery.FunctionCall;
import org.exist.xquery.value.Sequence;
import org.exist.dom.QName;
import org.apache.log4j.Logger;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import java.io.IOException;
import java.util.ArrayList;
public class ModuleCall extends URLRewrite {
private final static Logger LOG = Logger.getLogger(ModuleCall.class);
private FunctionCall call;
public ModuleCall(Element config, XQueryContext context, String uri) throws ServletException {
super(config, uri);
String funcName = config.getAttribute("function");
if (funcName == null || funcName.length() == 0)
{throw new ServletException("<exist:call> requires an attribute 'function'.");}
int arity = 0;
final int p = funcName.indexOf('/');
if (p > -1) {
final String arityStr = funcName.substring(p + 1);
try {
arity = Integer.parseInt(arityStr);
} catch (final NumberFormatException e) {
throw new ServletException("<exist:call>: could not parse parameter count in function attribute: " + arityStr);
}
funcName = funcName.substring(0, p);
}
try {
final QName fqn = QName.parse(context, funcName);
final Module module = context.getModule(fqn.getNamespaceURI());
UserDefinedFunction func = null;
if (module != null)
{func = ((ExternalModule)module).getFunction(fqn, arity, context);}
else
{func = context.resolveFunction(fqn, arity);}
call = new FunctionCall(context, func);
call.setArguments(new ArrayList<Expression>());
} catch (final XPathException e) {
e.printStackTrace();
}
}
protected ModuleCall(ModuleCall other) {
super(other);
this.call = other.call;
}
@Override
public void doRewrite(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
final Sequence result = call.eval(null);
LOG.debug("Found: " + result.getItemCount());
request.setAttribute(XQueryURLRewrite.RQ_ATTR_RESULT, result);
} catch (final XPathException e) {
throw new ServletException("Called function threw exception: " + e.getMessage(), e);
}
}
@Override
protected URLRewrite copy() {
return new ModuleCall(this);
}
}