| /* |
| * 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.components.expression.ExpressionContext; |
| 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.expression.JXTExpression; |
| 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.xml.sax.Attributes; |
| import org.xml.sax.SAXException; |
| import org.xml.sax.SAXParseException; |
| |
| /** |
| * @version SVN $Id$ |
| */ |
| public class Eval extends Instruction { |
| private final JXTExpression 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, |
| ExpressionContext expressionContext, ExecutionContext executionContext, |
| MacroContext macroContext, Event startEvent, Event endEvent) |
| throws SAXException { |
| try { |
| Object val = this.value.getNode(expressionContext); |
| 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, expressionContext, executionContext, |
| newMacroContext, 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(); |
| } |
| } |