/*
* 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.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.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* @version SVN $Id: If.java 569795 2007-08-26 10:08:56Z danielf $
*/
public class If extends Instruction {
private final Subst test;
public If(ParsingContext parsingContext, StartElement raw, Attributes attrs, Stack stack)
throws SAXException {
super(raw);
Locator locator = getLocation();
String test = attrs.getValue("test");
if (test != null) {
this.test = parsingContext.getStringTemplateParser().compileExpr(test, "if: \"test\": ", locator);
// Why is test lenient?
this.test.setLenient(Boolean.TRUE);
} else {
throw new SAXParseException("if: \"test\" is required", locator, null);
}
}
public Event execute(final XMLConsumer consumer,
ObjectModel objectModel, ExecutionContext executionContext,
MacroContext macroContext, NamespacesTable namespaces, Event startEvent, Event endEvent)
throws SAXException {
Object val;
try {
val = this.test.getValue(objectModel);
} catch (Exception e) {
throw new SAXParseException(e.getMessage(), getLocation(), e);
} catch (Error err) {
throw new SAXParseException(err.getMessage(), getLocation(),
new ErrorHolder(err));
}
boolean result = false;
if (val instanceof Boolean) {
result = ((Boolean) val).booleanValue();
} else {
result = (val != null);
}
if (!result) {
return getEndInstruction().getNext();
}
return getNext();
}
}