001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 *
019 */
020package org.apache.mina.integration.beans;
021
022import java.beans.PropertyEditor;
023import java.util.regex.Pattern;
024
025/**
026 * A {@link PropertyEditor} which converts a {@link String} into
027 * a {@link Number} and vice versa.
028 *
029 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
030 */
031public class NumberEditor extends AbstractPropertyEditor {
032    private static final Pattern DECIMAL = Pattern.compile("[-+]?[0-9]*\\.?[0-9]*(?:[Ee][-+]?[0-9]+)?");
033
034    private static final Pattern HEXADECIMAL = Pattern.compile("0x[0-9a-fA-F]+");
035
036    private static final Pattern OCTET = Pattern.compile("0[0-9][0-9]*");
037
038    @Override
039    protected final String toText(Object value) {
040        return (value == null ? "" : value.toString());
041    }
042
043    @Override
044    protected final Object toValue(String text) throws IllegalArgumentException {
045        if (text.length() == 0) {
046            return defaultValue();
047        }
048
049        if (HEXADECIMAL.matcher(text).matches()) {
050            return toValue(text.substring(2), 16);
051        }
052
053        if (OCTET.matcher(text).matches()) {
054            return toValue(text, 8);
055        }
056
057        if (DECIMAL.matcher(text).matches()) {
058            return toValue(text, 10);
059        }
060
061        throw new NumberFormatException("Not a number: " + text);
062    }
063
064    protected Object toValue(String text, int radix) {
065        return Integer.parseInt(text, radix);
066    }
067
068    @Override
069    protected Object defaultValue() {
070        return Integer.valueOf(0);
071    }
072}