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/*
* ====================================================================
* Project: openMDX/Core, http://www.openmdx.org/
* Description: Properties Configuration Provider
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2014, OMEX AG, Switzerland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the openMDX team nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ------------------
*
* This product includes software developed by other organizations as
* listed in the NOTICE file.
*/
package org.openmdx.kernel.configuration;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import org.openmdx.kernel.text.spi.Parser;
/**
* Standard Configuration Provider
*/
public class PropertiesConfigurationProvider implements ConfigurationProvider {
/**
* Constructor
*
* @param parser the primitive type parser to be used
* @param uri the URI to retrieve the properties
*
* @throws IOException
*/
protected PropertiesConfigurationProvider(
Parser parser,
char delimiter,
Properties properties
) throws IOException{
this.delimiter = delimiter;
this.parser = parser;
this.properties = properties;
}
/**
* The primitive type parser
*/
private final Parser parser;
/**
* The property file prefix
*/
private final Properties properties;
/**
* Delimiter to form qualified names
*/
final char delimiter;
/**
* Create a ConfigurationProvider which loads the properties eagerly
*
* @param parser the primitive type parser to be used
* @param uri the URI to load the properties
*
* @return a configuration provider with a snapshot of the properties
*
* @throws IOException
*/
public static ConfigurationProvider newInstance(
Parser parser,
char delimiter,
String uri
) throws IOException{
return new PropertiesConfigurationProvider(
parser,
delimiter,
PropertiesProvider.getProperties(uri)
);
}
/* (non-Javadoc)
* @see org.openmdx.kernel.configuration.ConfigurationProvider#getConfiguration(java.lang.String)
*/
@Override
public Configuration getConfiguration(String section) {
return new MapConfiguration(selectEntries(null, section), parser);
}
/* (non-Javadoc)
* @see org.openmdx.kernel.configuration.ConfigurationProvider#getConfiguration(java.lang.String, java.util.Map)
*/
@Override
public Configuration getConfiguration(String section, Map override) {
final MapConfiguration configuration = new MapConfiguration(override, parser);
configuration.populate(selectEntries(configuration, section));
return configuration;
}
private Map selectEntries(
MapConfiguration exclusion,
String section
) {
Map target = new HashMap();
for(Enumeration n = this.properties.propertyNames();n.hasMoreElements();) {
final Object key = n.nextElement();
if(key instanceof String) {
final String propertyName = (String) key;
final String simpleName = selectSimpleName(propertyName, section);
if(simpleName != null) {
if(exclusion == null || !exclusion.containsKey(simpleName)) {
target.put(simpleName, this.properties.getProperty(propertyName));
}
}
}
}
return target;
}
/**
* Retrieve the simple names belonging to the section
*
* @param qualifiedPropertyName the (dot separated) qualified property name
* @param section the (dot separated) qualified section name
*
* @return return the simple name if the qualified one belongs to the section,
* null otherwise
*/
private String selectSimpleName(
String qualifiedPropertyName,
String section
) {
final int sectionLength = section.length();
if(sectionLength == 0) {
return (
!qualifiedPropertyName.isEmpty() &&
qualifiedPropertyName.indexOf(delimiter) < 0
) ? qualifiedPropertyName : null;
} else {
final int simpleNameStart = sectionLength + 1;
return (
qualifiedPropertyName.length() > simpleNameStart &&
qualifiedPropertyName.startsWith(section) &&
qualifiedPropertyName.charAt(sectionLength) == delimiter &&
qualifiedPropertyName.indexOf(delimiter, simpleNameStart) < 0
) ? qualifiedPropertyName.substring(simpleNameStart) : null;
}
}
}
