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package org.apache.james.transport.matchers;

import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import javax.mail.MessagingException;

import org.apache.james.core.MailAddress;
import org.apache.mailet.base.GenericRecipientMatcher;

import com.google.common.base.Strings;

/**
 * <P>Matches recipients whose address matches a regular expression.</P>
 * <P>Is equivalent to the {@link SenderIsRegex} matcher but matching on the recipient.</P>
 * <P>Configuration string: a regular expression.</P>
 * <PRE><CODE>
 * &lt;mailet match=&quot;RecipientIsRegex=&lt;regular-expression&gt;&quot; class=&quot;&lt;any-class&gt;&quot;&gt;
 * </CODE></PRE>
 * <P>The example below will match any recipient in the format user@log.anything</P>
 * <PRE><CODE>
 * &lt;mailet match=&quot;RecipientIsRegex=(.*)@log\.(.*)&quot; class=&quot;&lt;any-class&gt;&quot;&gt;
 * &lt;/mailet&gt;
 * </CODE></PRE>
 *
 * @version CVS $Revision$ $Date$
 */

public class RecipientIsRegex extends GenericRecipientMatcher {
    Pattern pattern   = null;

    @Override
    public void init() throws javax.mail.MessagingException {
        String patternString = getCondition();
        if (Strings.isNullOrEmpty(patternString)) {
            throw new MessagingException("Pattern is missing");
        }
        
        patternString = patternString.trim();
        try {
            pattern = Pattern.compile(patternString);
        } catch (PatternSyntaxException mpe) {
            throw new MessagingException("Malformed pattern: " + patternString, mpe);
        }
    }

    @Override
    public boolean matchRecipient(MailAddress recipient) {
        String myRecipient = recipient.toString();
        return pattern.matcher(myRecipient).matches();
    }
}
