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A light weight and high performance Java caching library. XML configuration file support. This artifact is included in cache2k-all.

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package org.cache2k.xmlConfiguration;

/*
 * #%L
 * cache2k XML configuration
 * %%
 * Copyright (C) 2000 - 2017 headissue GmbH, Munich
 * %%
 * 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
 * 
 *      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.
 * #L%
 */

import java.util.HashMap;
import java.util.Map;

/**
 * @author Jens Wilke
 */
public class StandardPropertyParser implements PropertyParser {

  private Map, ValueConverter> type2parser = new HashMap, ValueConverter>();

  private static final Map UNIT2LONG = new HashMap() {{
    put("KiB", 1024L);
    put("MiB", 1024L * 1024);
    put("GiB", 1024L * 1024 * 1024);
    put("TiB", 1024L * 1024 * 1024 * 1024);
    put("k", 1000L);
    put("M", 1000L * 1000);
    put("G", 1000L * 1000 * 1000);
    put("T", 1000L * 1000 * 1000 * 1000);
    put("s", 1000L);
    put("m", 1000L * 60);
    put("h", 1000L * 60 * 60);
    put("d", 1000L * 60 * 60 * 24);
  }};

  public Object parse(Class _targetType, String _value) throws Exception {
    ValueConverter p = type2parser.get(_targetType);
    if (p == null) {
      throw new IllegalArgumentException("Unknown target type: " + _targetType);
    }
    return p.parse(_value);
  }

  private void addParser(Class _type, ValueConverter p) {
    type2parser.put(_type, p);
  }

  private void addParser(Class _primitiveType, Class _type, ValueConverter p) {
    type2parser.put(_primitiveType, p);
    type2parser.put(_type, p);
  }

  {
    addParser(Integer.TYPE, Integer.class, new ValueConverter() {
      @Override
      public Integer parse(final String v) {
        return Integer.valueOf(v);
      }
    });
    addParser(Boolean.TYPE, Boolean.class, new ValueConverter() {
      @Override
      public Boolean parse(String v) {
        v = v.toLowerCase();
        if ("true".equals(v)) {
          return true;
        }
        if ("false".equals(v)) {
          return false;
        }
        throw new IllegalArgumentException("no boolean, true/false expected");
      }
    });
    addParser(Long.TYPE, Long.class, new ValueConverter() {
      @Override
      public Long parse(String v) {
        return parseLongWithUnitSuffix(v);
      }
    });
    addParser(String.class, new ValueConverter() {
      @Override
      public String parse(final String v) {
        return v;
      }
    });
  }

  static long parseLongWithUnitSuffix(String v) {
    v = v.replace("_", "");
    long _multiplier = 1;
    int pos = v.length();
    while(--pos >= 0 && !Character.isDigit(v.charAt(pos)));
    if (pos < v.length() - 1) {
      String _unitSuffix = v.substring(pos + 1);
      Long _newMultiplier = UNIT2LONG.get(_unitSuffix);
      if (_newMultiplier == null) {
        throw new NumberFormatException("Unknown unit suffix in: \"" + v + "\"");
      }
      v = v.substring(0, pos + 1);
      _multiplier = _newMultiplier;
    }
    return Long.valueOf(v) * _multiplier;
  }

}