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JSR 354 provides an API for representing, transporting, and performing comprehensive calculations with Money and Currency. This module implements JSR 354.

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/*
  Copyright (c) 2012, 2014, Credit Suisse (Anatole Tresch), Werner Keil and others by the @author tag.

  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.
 */
package org.javamoney.moneta.spi;

import java.io.IOException;
import java.net.URL;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Loader for the Java Money JSR configuration.
 *
 * @author Anatole Tresch
 */
public final class MonetaryConfig {

    private static final Logger LOG = Logger
            .getLogger(MonetaryConfig.class.getName());

    private static final MonetaryConfig INSTANCE = new MonetaryConfig();

    private final Map config = new HashMap<>();
    private final Map priorities = new HashMap<>();

    private MonetaryConfig() {
        try {
            Enumeration urls = getClass().getClassLoader().getResources(
                    "javamoney.properties");
            while (urls.hasMoreElements()) {
                URL url = urls.nextElement();
                try {
                    Properties props = new Properties();
                    props.load(url.openStream());
                    updateConfig(props);
                } catch (Exception e) {
                    LOG.log(Level.SEVERE,
                            "Error loading javamoney.properties, ignoring "
                                    + url, e);
                }
            }
        } catch (IOException e) {
            LOG.log(Level.SEVERE, "Error loading javamoney.properties.", e);
        }
    }

    private void updateConfig(Properties props) {
        for (Map.Entry en : props.entrySet()) {
            String key = en.getKey().toString();
            String value = en.getValue().toString();
            int prio = 0;
            if (key.startsWith("{")) {
                int index = key.indexOf('}');
                if (index > 0) {
                    String prioString = key.substring(1, index);
                    try {
                        prio = Integer.parseInt(prioString);
                        key = key.substring(index + 1);
                    } catch (NumberFormatException e) {
                        LOG.warning("Invalid config key in javamoney.properties: " + key);
                    }
                }
            }
            Integer existingPrio = priorities.get(key);
            if (existingPrio==null) {
                priorities.put(key, prio);
                config.put(key, value);
            } else if (existingPrio < prio) {
                priorities.put(key, prio);
                config.put(key, value);
            } else if (existingPrio == prio) {
                String oldValue = props.getProperty(key);
                if(!value.equals(oldValue)){
                    throw new IllegalStateException(
                            "AmbiguousConfiguration detected for '" + key + "'.");
                }
            }
            // else ignore entry with lower prio!
        }
    }

    public static Map getConfig() {
        return Collections.unmodifiableMap(INSTANCE.config);
    }

}