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This API determines the holidays for a given year, country/name and eventually state/region. The holiday data is stored in XML files (one for each country) and will be read from the classpath. You can provide your own holiday calendar XML file or use any of the provided ones. Currently there are 63 countries supported like the following: United States, most european countries, Russia, India, Australia. Besides those there will be more special calendars like currently existing NYSE calendar (New York Stock Exchange).

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/**
 * Copyright 2012 Sven Diedrichsen
 * 
 * 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 de.jollyday.configuration.impl;

import de.jollyday.configuration.ConfigurationProvider;
import de.jollyday.util.ResourceUtil;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.text.MessageFormat;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Provider which adds jollydays default configuration file
 * 'jollyday.properties' by reading it from the classpath by using the currents
 * threads classloader.
 *
 * @author Sven Diedrichsen
 */
public class DefaultConfigurationProvider implements ConfigurationProvider {

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

    /**
     * The name of the configuration file.
     */
    private static final String CONFIG_FILE = "jollyday.properties";
    /**
     * The utility to load resources.
     */
    private final ResourceUtil resourceUtil = new ResourceUtil();

    /*
     * (non-Javadoc)
     *
     * @see
     * de.jollyday.configuration.ConfigurationProvider#addConfiguration(java
     * .util.Properties)
     */
    @Override
    public Properties getProperties() {
        Properties properties = new Properties();
        try {
            URL config = resourceUtil.getResource(CONFIG_FILE);
            if (config == null) {
                throw new IllegalStateException("Properties file " + CONFIG_FILE + " not found on classpath.");
            }
            try(InputStream stream = config.openStream()){
                if (stream != null) {
                    properties.load(stream);
                } else {
                    LOG.log(Level.WARNING, "Could not load default properties file '{0}' from classpath.", new Object[]{CONFIG_FILE});
                }
            }
            return properties;
        } catch (IOException e) {
            throw new IllegalStateException(
                    "Could not load default properties from classpath.", e);
        }
    }

}