/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2011, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.core.joran.action;
import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.joran.spi.ActionException;
import ch.qos.logback.core.util.OptionHelper;
import ch.qos.logback.core.spi.PropertyDefiner;
import org.xml.sax.Attributes;
/**
* Instantiate class for define property value. Get future property name and
* property definer class from attributes. Some property definer properties
* could be used. After defining put new property to context.
*
* @author Aleksey Didik
*/
public class DefinePropertyAction extends Action {
String propertyName;
PropertyDefiner definer;
boolean inError;
public void begin(InterpretationContext ec, String localName,
Attributes attributes) throws ActionException {
// reset variables
propertyName = null;
definer = null;
inError = false;
// read future property name
propertyName = attributes.getValue(NAME_ATTRIBUTE);
if (OptionHelper.isEmpty(propertyName)) {
addError("Missing property name for property definer. Near [" + localName
+ "] line " + getLineNumber(ec));
inError = true;
return;
}
// read property definer class name
String className = attributes.getValue(CLASS_ATTRIBUTE);
if (OptionHelper.isEmpty(className)) {
addError("Missing class name for property definer. Near [" + localName
+ "] line " + getLineNumber(ec));
inError = true;
return;
}
// try to instantiate property definer
try {
addInfo("About to instantiate property definer of type [" + className
+ "]");
definer = (PropertyDefiner) OptionHelper.instantiateByClassName(
className, PropertyDefiner.class, context);
definer.setContext(context);
ec.pushObject(definer);
} catch (Exception oops) {
inError = true;
addError("Could not create an PropertyDefiner of type [" + className
+ "].", oops);
throw new ActionException(oops);
}
}
/**
* Now property definer is initialized by all properties and we can put
* property value to context
*/
public void end(InterpretationContext ec, String name) {
if (inError) {
return;
}
Object o = ec.peekObject();
if (o != definer) {
addWarn("The object at the of the stack is not the property definer for property named ["
+ propertyName + "] pushed earlier.");
} else {
addInfo("Popping property definer for property named [" + propertyName
+ "] from the object stack");
ec.popObject();
// let's put defined property and value to context
context.putProperty(propertyName, definer.getPropertyValue());
}
}
}