sizegreaterthan.java

邮件服务器系统 支持SMTP POP3 是著名的Apache写 有一定的参考价值

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 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
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 * ------------------------------------------------------------------- *
 * 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:                                *
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 *     http://www.apache.org/licenses/LICENSE-2.0                      *
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 * distributed under the License is distributed on an "AS IS" BASIS,   *
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 * permissions and limitations under the License.                      *
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package org.apache.james.transport.matchers;

import org.apache.mailet.GenericMatcher;
import org.apache.mailet.Mail;

import javax.mail.Header;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Locale;

/**
 * Checks whether the message (entire message, not just content) is greater
 * than a certain number of bytes.  You can use 'k' and 'm' as optional postfixes.
 * In other words, "1m" is the same as writing "1024k", which is the same as
 * "1048576".
 *
 */
public class SizeGreaterThan extends GenericMatcher {

    int cutoff = 0;

    public void init() {
        String amount = getCondition().trim().toLowerCase(Locale.US);
        if (amount.endsWith("k")) {
            amount = amount.substring(0, amount.length() - 1);
            cutoff = Integer.parseInt(amount) * 1024;
        } else if (amount.endsWith("m")) {
            amount = amount.substring(0, amount.length() - 1);
            cutoff = Integer.parseInt(amount) * 1024 * 1024;
        } else {
            cutoff = Integer.parseInt(amount);
        }
    }

    public Collection match(Mail mail) throws MessagingException {
        MimeMessage message = mail.getMessage();
        //Calculate the size
        int size = message.getSize();
        Enumeration e = message.getAllHeaders();
        while (e.hasMoreElements()) {
            size += ((Header)e.nextElement()).toString().length();
        }
        if (size > cutoff) {
            return mail.getRecipients();
        } else {
            return null;
        }
    }
}