/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cocoon.template.instruction;
import java.util.Stack;
import org.apache.cocoon.el.objectmodel.ObjectModel;
import org.apache.cocoon.el.parsing.Subst;
import org.apache.cocoon.template.environment.ErrorHolder;
import org.apache.cocoon.template.environment.ExecutionContext;
import org.apache.cocoon.template.environment.ParsingContext;
import org.apache.cocoon.template.script.Invoker;
import org.apache.cocoon.template.script.event.Event;
import org.apache.cocoon.template.script.event.StartElement;
import org.apache.cocoon.xml.XMLConsumer;
import org.apache.cocoon.xml.util.NamespacesTable;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* @version SVN $Id: Eval.java 569795 2007-08-26 10:08:56Z danielf $
*/
public class Eval extends Instruction {
private final Subst value;
public Eval(ParsingContext parsingContext, StartElement raw, Attributes attrs, Stack stack)
throws SAXException {
super(raw);
String select = attrs.getValue("select");
this.value = parsingContext.getStringTemplateParser().compileExpr(select, "eval: \"select\":", getLocation());
}
public Event execute(final XMLConsumer consumer,
ObjectModel objectModel, ExecutionContext executionContext,
MacroContext macroContext, NamespacesTable namespaces, Event startEvent, Event endEvent)
throws SAXException {
try {
Object val = this.value.getNode(objectModel);
if (!(val instanceof StartElement)) {
throw new Exception("macro invocation required instead of: " + val);
}
StartElement call = (StartElement) val;
//FIXME: eval does not allow to call macro providing macro body
MacroContext newMacroContext = new MacroContext( call.getQname(), null, null );
Invoker.execute(consumer, objectModel, executionContext,
newMacroContext, namespaces, call.getNext(), call.getEndElement());
} catch (Exception exc) {
throw new SAXParseException(exc.getMessage(), getLocation(), exc);
} catch (Error err) {
throw new SAXParseException(err.getMessage(), getLocation(), new ErrorHolder(err));
}
return getEndInstruction().getNext();
}
}