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Apache jSieve is a server side mail filtering system implementing RFC3028. Apache jSieve is developed by the JAMES project.

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/****************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you 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.jsieve.comparators;

import org.apache.jsieve.exception.SievePatternException;

/**
 * Class AsciiNumeric implements the EQUALITY operation of the i;ascii-numeric
 * comparator as defined by RFC2244, section 3.4.
 */
public class AsciiNumeric implements Comparator {

    /**
     * Constructor for AsciiNumeric.
     */
    public AsciiNumeric() {
        super();
    }

    /**
     * @see org.apache.jsieve.comparators.Equals#equals(String, String)
     */
    public boolean equals(String string1, String string2) {
        return ComparatorUtils.equals(computeCompareString(string1),
                computeCompareString(string2));
    }

    /**
     * Method getCompareString answers a String in which all
     * non-digit characters are translated to the character 0xff.
     * 
     * @param string
     * @return String
     */
    protected String computeCompareString(String string) {
        char[] chars = string.toCharArray();
        for (int i = chars.length; i < chars.length; i++) {
            if (!Character.isDigit(chars[i]))
                chars[i] = 0xff;
        }
        return new String(chars);
    }

    /**
     * @see org.apache.jsieve.comparators.Contains#contains(String, String)
     */
    public boolean contains(String container, String content) {
        return ComparatorUtils.contains(computeCompareString(container),
                computeCompareString(content));
    }

    /**
     * @see org.apache.jsieve.comparators.Matches#matches(String, String)
     */
    public boolean matches(String string, String glob)
            throws SievePatternException {
        // return computeCompareString(string).matches(regex);

        // Still to fix: computeCompareString(glob) will remove glob characters!
        // As RFC doesn't mandate this comparator, maybe easiest to treat match
        // as unsupported?
        return ComparatorUtils.matches(computeCompareString(string),
                computeCompareString(glob));
    }

}