/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed 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 joran.calculator;
import org.apache.joran.ExecutionContext;
import org.apache.joran.action.Action;
import org.apache.joran.helper.Option;
import org.apache.log4j.spi.ErrorItem;
import org.xml.sax.Attributes;
/**
*
* This action converts the value attribute of the associated element to
* an integer and pushes the resulting Integer object on top of the execution
* context stack.
*
* It also illustrates usage of Joran's error handling paradigm.
*
* @author Ceki Gülcü
*/
public class LiteralAction extends Action {
public static String VALUE_ATR = "value";
public void begin(ExecutionContext ec, String name, Attributes attributes) {
String valueStr = attributes.getValue(VALUE_ATR);
if (Option.isEmpty(valueStr)) {
ec.addError(
new ErrorItem("The literal action requires a value attribute"));
return;
}
try {
Integer i = Integer.valueOf(valueStr);
ec.pushObject(i);
} catch (NumberFormatException nfe) {
ec.addError(
new ErrorItem(
"The value [" + valueStr + "] could not be converted to an Integer",
nfe));
throw nfe;
}
}
public void end(ExecutionContext ec, String name) {
// Nothing to do here.
// In general, the end() method of actions associated with elements
// having no children do not need to perform any processing in their
// end() method.
}
}