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v1.3alpha8 :: examples / src / joran / newRule /

NewRuleCalculator.java

/*
 * 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.newRule;

import joran.calculator.ComputationAction2;

import org.apache.log4j.joran.action.NewRuleAction;
import org.apache.log4j.joran.spi.Interpreter;
import org.apache.log4j.joran.spi.Pattern;
import org.apache.log4j.joran.spi.RuleStore;
import org.apache.log4j.joran.spi.SimpleRuleStore;

import java.util.List;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;


/**
 * This example illustrates the usage of NewRuleAction which allows the Joran
 * interpreter to learn new rules on the fly from the XML file being
 * interpreted.
 *
 * This example relies heavily on the code from the joran.calculator package.
 *
 * @author Ceki Güulcü
 */
public class NewRuleCalculator {
  public static void main(String[] args) throws Exception {
    // Uncomment the following line in order to enable log statements generated
    // from joran itself.
    // org.apache.log4j.BasicConfigurator.configure();
    
    // As usual, we create a simple rule store.
    RuleStore ruleStore = new SimpleRuleStore();

    // we start with the rule for the top-most (root) element
    ruleStore.addRule(new Pattern("*/computation"), new ComputationAction2());

    // Associate "/new-rule" pattern with NewRuleAction from the 
    // org.apache.joran.action package.
    // 
    // We will let the XML file to teach the Joran interpreter about new rules 
    ruleStore.addRule(
      new Pattern("/computation/new-rule"), new NewRuleAction());

    // Create a new Joran Interpreter and hand it our simple rule store.
    Interpreter ji = new Interpreter(ruleStore);

    // Create a SAX parser
    SAXParserFactory spf = SAXParserFactory.newInstance();
    SAXParser saxParser = spf.newSAXParser();

    // Parse the file given as the application's first argument and
    // set the SAX ContentHandler to the Joran Interpreter we just created.
    saxParser.parse(args[0], ji);


    // The file has been parsed and interpreted. We now print any errors that 
    // might have occured.
    List errorList = ji.getExecutionContext().getErrorList();

    if (errorList.size() > 0) {
      System.out.println("The following errors occured:");

      for (int i = 0; i < errorList.size(); i++) {
        System.out.println("\t" + errorList.get(i));
      }
    }
  }
}
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