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/*
* ====================================================================
* Project: openMDX/Core, http://www.openmdx.org/
* Description: Properties Factory
* 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.io.InputStream;
import java.net.URL;
import java.util.Collections;
import java.util.InvalidPropertiesFormatException;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.openmdx.base.collection.TreeSparseArray;
import org.openmdx.kernel.exception.BasicException;
import org.openmdx.kernel.exception.Throwables;
import org.openmdx.kernel.loading.Classes;
import org.w3c.cci2.SparseArray;
/**
* The properties provider loads and merges properties
*/
public class PropertiesProvider {
/**
* Constructor
*/
private PropertiesProvider(){
// Avoid instantiation
}
/**
*
*/
private static final String RESOURCE_XRI_PREFIX = "xri://+resource/";
/**
*
*/
private static final Pattern INCLUDES = Pattern.compile("^include\\[([0-9]+)\\]?$");
/**
*
*/
private static final String DEFAULTS = "defaults";
/**
* Select the <String,String> entries
*
* @param source a Map
*
* @return corresponding properties
*/
public static Properties toProperties(
Map source
){
Properties target = new Properties();
for(Map.Entry entry : source.entrySet()) {
Object key = entry.getKey();
Object value = entry.getValue();
if(key instanceof String && value instanceof String) {
target.setProperty((String)key, (String)value);
}
}
return target;
}
/**
* Retrieve the properties by resolving URIs
*
* @param uri
*
* @return the properties retrieved for the given URI
*
* @throws IOException in case of access failure
*/
public static Properties getProperties(
String uri
) throws IOException {
List urls = uri == null || uri.length() == 0 ? Collections.emptyList(
) : uri.startsWith(RESOURCE_XRI_PREFIX) ? Collections.list(
Classes.getResources(uri.substring(RESOURCE_XRI_PREFIX.length()))
) : Collections.singletonList(
new URL(uri)
);
switch(urls.size()) {
case 0:
return new Properties();
case 1:
return getProperties(urls.get(0));
default:
Properties target = new Properties();
for(URL url : urls) {
include(target, getProperties(url));
}
return target;
}
}
/**
* Include the source into the target
*
* @param target
* @param source
*
* @throws IOException in case of conflicting values
*/
private static void include(
Properties target,
Properties source
) throws IOException{
for(Map.Entry e : source.entrySet()) {
Object name = e.getKey();
if(target.containsKey(name)) {
Object oldValue = target.get(name);
Object newValue = e.getValue();
if(oldValue == null ? newValue != null : !oldValue.equals(newValue)) {
throw Throwables.initCause(
new InvalidPropertiesFormatException("Conflicting property settings"),
null,
BasicException.Code.DEFAULT_DOMAIN,
BasicException.Code.INVALID_CONFIGURATION,
"Conflicting property settings",
new BasicException.Parameter("name", name),
new BasicException.Parameter("oldValue", oldValue),
new BasicException.Parameter("newValue", newValue)
);
}
} else {
target.put(e.getKey(), e.getValue());
}
}
}
/**
* Retrieve the properties by resolving defaults and include entries.
*
* @param url
*
* @return the properties retrieved for the given URL
*
* @throws IOException in case of access failure or a configuration conflict
*/
private static Properties getProperties(
URL url
) throws IOException {
Properties properties = new Properties();
try (InputStream source = url.openStream()){
properties.load(source);
}
String defaultsURI = (String) properties.remove(DEFAULTS);
if(defaultsURI != null) {
Properties combined = new Properties(getProperties(defaultsURI));
combined.putAll(properties);
properties = combined;
}
SparseArray includes = new TreeSparseArray();
for(
Iterator> i = properties.entrySet().iterator();
i.hasNext();
) {
Map.Entry e = i.next();
Object key = e.getKey();
Object value = e.getValue();
if(e.getKey() instanceof String && value instanceof String){
Matcher matcher = INCLUDES.matcher((String)key);
if(matcher.matches()) {
includes.put(
Integer.valueOf(matcher.group(1)),
((String)value).trim()
);
i.remove();
}
}
}
for(
ListIterator i = includes.populationIterator();
i.hasNext();
){
include(properties, getProperties(i.next()));
}
return properties;
}
}
