org.manalang.monkeygrease.Config.java Source code

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Here is the source code for org.manalang.monkeygrease.Config.java

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/**
 * Monkeygrease
 * Copyright (C) 2005-2006 Rich Manalang
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy 
 * of this software and associated documentation files (the "Software"), to deal 
 * in the Software without restriction, including without limitation the rights 
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
 * copies of the Software, and to permit persons to whom the Software is 
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in 
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
 * SOFTWARE.
 */
package org.manalang.monkeygrease;

import java.io.IOException;
import java.io.InputStream;

import javax.servlet.ServletContext;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXParseException;

/**
 * Config class represents the rules defined in the configuration file.
 * 
 * @author Rich Manalang
 * @version 0.20 Build 308 Sep 22, 2006 18:03 GMT
 */
public class Config {

    private static final String DEFAULT_WEB_CONF_FILE = "/WEB-INF/monkeygrease.xml";

    private static ServletContext context;

    private Rules rules;

    public Config(ServletContext sc) {
        context = sc;
        load();
    }

    public synchronized void load() {

        InputStream is = null;
        GetMethod method = null;

        if (MonkeygreaseFilter.remoteConfigURL != "" && MonkeygreaseFilter.remoteConfigURL != null) {
            method = new GetMethod(MonkeygreaseFilter.remoteConfigURL);
            method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
                    new DefaultHttpMethodRetryHandler(3, false));
            try {
                // Execute the method.
                int statusCode = MonkeygreaseFilter.client.executeMethod(method);

                if (statusCode != HttpStatus.SC_OK) {
                    MonkeygreaseFilter.log.severe("Method failed: " + method.getStatusLine());
                }
                is = method.getResponseBodyAsStream();
            } catch (HttpException e) {
                MonkeygreaseFilter.log.severe("Fatal protocol violation: " + e.getMessage());
            } catch (IOException e) {
                MonkeygreaseFilter.log.severe("Fatal transport error: " + e.getMessage());
            }

        } else {
            is = context.getResourceAsStream(DEFAULT_WEB_CONF_FILE);

            if (is == null) {
                System.out.println("unable to find monkeygrease conf file " + DEFAULT_WEB_CONF_FILE);
            }
        }

        DocumentBuilder parser;

        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        // factory.setValidating(true);
        // factory.setNamespaceAware(true);
        // factory.setIgnoringComments(true);
        // factory.setIgnoringElementContentWhitespace(true);
        try {
            parser = factory.newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            MonkeygreaseFilter.log.severe("Unable to setup XML parser for reading conf " + e.toString());
            return;
        }

        // parser.setErrorHandler(handler);
        // parser.setEntityResolver(handler);

        try {
            Document doc = parser.parse(is);

            if (MonkeygreaseFilter.remoteConfigURL != "" && MonkeygreaseFilter.remoteConfigURL != null)
                method.releaseConnection();

            NodeList rulesConf = doc.getElementsByTagName("rule");
            rules = new Rules();

            for (int i = 0; i < rulesConf.getLength(); i++) {
                Node ruleNode = rulesConf.item(i);
                Rule rule = new Rule(ruleNode);
                if (rule.isEnabled())
                    rules.add(rule);
            }
            // processConfDoc(doc);
        } catch (SAXParseException e) {
            MonkeygreaseFilter.log.severe("Parse error on line " + e.getLineNumber() + " " + e.toString());
        } catch (Exception e) {
            MonkeygreaseFilter.log.severe("Exception loading conf " + " " + e.toString());
        }
    }

    public Rules getRules() {
        return rules;
    }

    public String getDEFAULT_WEB_CONF_FILE() {
        return DEFAULT_WEB_CONF_FILE;
    }
}