org.apache.james.mailetcontainer.lib.matchers.Not Maven / Gradle / Ivy

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package org.apache.james.mailetcontainer.lib.matchers;

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 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
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 * software distributed under the License is distributed on an  *
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
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import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

import org.apache.mailet.Matcher;
import org.apache.mailet.Mail;

import javax.mail.MessagingException;

public class Not extends GenericCompositeMatcher {

    /**
     * This is the Not CompositeMatcher - consider what wasn't in the result set
     * of each child matcher. Of course it is easier to understand if it only
     * includes one matcher in the composition, the normal recommended use. @See
     * CompositeMatcher interface.
     * 
     * @return Collectiom of Recipient from the Negated composition of the child
     *         Matcher(s).
     */
    public Collection match(Mail mail) throws MessagingException {
        Collection finalResult = mail.getRecipients();
        Matcher matcher = null;
        for (Iterator matcherIter = iterator(); matcherIter.hasNext();) {
            matcher = (Matcher) (matcherIter.next());
            // log("Matching with " +
            // matcher.getMatcherConfig().getMatcherName());
            Collection result = matcher.match(mail);
            if (result == finalResult) {
                // Not is an empty list
                finalResult = null;
            } else if (result != null) {
                finalResult = new ArrayList(finalResult);
                finalResult.removeAll(result);
            }
        }
        return finalResult;
    }
}