matchloader.java

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/***********************************************************************
 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
 * All rights reserved.                                                *
 * ------------------------------------------------------------------- *
 * 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.                      *
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package org.apache.james.transport;
import javax.mail.MessagingException;

import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.james.core.MatcherConfigImpl;
import org.apache.mailet.MailetContext;
import org.apache.mailet.MailetException;
import org.apache.mailet.Matcher;
/**
 * Loads Matchers for use inside James.
 *
 */
public class MatchLoader extends Loader implements Configurable {
        /**
     * @see org.apache.avalon.framework.configuration.Configurable#configure(Configuration)
     */
    public void configure(Configuration conf) throws ConfigurationException {
           getPackages(conf,MATCHER_PACKAGE);
           configureMailetClassLoader();
    }


    /**
     * Get a new Matcher with the specified name acting
     * in the specified context.
     *
     * @param matchName the name of the matcher to be loaded
     * @param context the MailetContext to be passed to the new
     *                matcher
     * @throws MessagingException if an error occurs
     */
    public Matcher getMatcher(String matchName, MailetContext context) throws MessagingException {
        try {
            String condition = (String) null;
            int i = matchName.indexOf('=');
            if (i != -1) {
                condition = matchName.substring(i + 1);
                matchName = matchName.substring(0, i);
            }
            for (i = 0; i < packages.size(); i++) {
                String className = (String) packages.elementAt(i) + matchName;
                try {
                    MatcherConfigImpl configImpl = new MatcherConfigImpl();
                    configImpl.setMatcherName(matchName);
                    configImpl.setCondition(condition);
                    configImpl.setMailetContext(context);
                    Matcher matcher = (Matcher) mailetClassLoader.loadClass(className).newInstance();
                    matcher.init(configImpl);
                    return matcher;
                } catch (ClassNotFoundException cnfe) {
                    //do this so we loop through all the packages
                }
            }
            StringBuffer exceptionBuffer =
                new StringBuffer(128)
                    .append("Requested matcher not found: ")
                    .append(matchName)
                    .append(".  looked in ")
                    .append(packages.toString());
            throw new ClassNotFoundException(exceptionBuffer.toString());
        } catch (MessagingException me) {
            throw me;
        } catch (Exception e) {
            StringBuffer exceptionBuffer =
                new StringBuffer(128).append("Could not load matcher (").append(matchName).append(
                    ")");
            throw new MailetException(exceptionBuffer.toString(), e);
        }
    }
}