001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.activemq.util;
018
019import java.beans.PropertyEditorSupport;
020import java.util.regex.Matcher;
021import java.util.regex.Pattern;
022
023/**
024 * Used by xbean to set longs.
025 * <p/>
026 * <b>Important: </b> Do not use this for other purposes than xbean, as property editors
027 * are not thread safe, and they are slow to use.
028 * <p/>
029 * Converts string values like "20 Mb", "1024kb", and "1g" to long values in
030 * bytes.
031 */
032public class MemoryPropertyEditor extends PropertyEditorSupport {
033    public void setAsText(String text) throws IllegalArgumentException {
034
035        Pattern p = Pattern.compile("^\\s*(\\d+)\\s*(b)?\\s*$", Pattern.CASE_INSENSITIVE);
036        Matcher m = p.matcher(text);
037        if (m.matches()) {
038            setValue(Long.valueOf(Long.parseLong(m.group(1))));
039            return;
040        }
041
042        p = Pattern.compile("^\\s*(\\d+)\\s*k(b)?\\s*$", Pattern.CASE_INSENSITIVE);
043        m = p.matcher(text);
044        if (m.matches()) {
045            setValue(Long.valueOf(Long.parseLong(m.group(1)) * 1024));
046            return;
047        }
048
049        p = Pattern.compile("^\\s*(\\d+)\\s*m(b)?\\s*$", Pattern.CASE_INSENSITIVE);
050        m = p.matcher(text);
051        if (m.matches()) {
052            setValue(Long.valueOf(Long.parseLong(m.group(1)) * 1024 * 1024));
053            return;
054        }
055
056        p = Pattern.compile("^\\s*(\\d+)\\s*g(b)?\\s*$", Pattern.CASE_INSENSITIVE);
057        m = p.matcher(text);
058        if (m.matches()) {
059            setValue(Long.valueOf(Long.parseLong(m.group(1)) * 1024 * 1024 * 1024));
060            return;
061        }
062
063        throw new IllegalArgumentException("Could convert not to a memory size: " + text);
064    }
065
066    public String getAsText() {
067        Long value = (Long)getValue();
068        return value != null ? value.toString() : "";
069    }
070
071}