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/*
* ====================================================================
* Project: openMDX/Core, http://www.openmdx.org/
* Description: XML Output Factory Builder
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2010-2013, 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.base.xml.stream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import org.openmdx.kernel.exception.BasicException;
import org.openmdx.kernel.loading.Classes;
import org.openmdx.kernel.loading.Resources;
import org.openmdx.kernel.log.SysLog;
/**
* XML Output Factory Builder
*/
public class XMLOutputFactories {
/**
* Constructor
*/
private XMLOutputFactories() {
// Avoid instantiation
}
/**
* The MIME type property
*/
public static final String MIME_TYPE = "org.openmdx.xml.stream.mimeType";
/**
* The configuration
*/
private static final Properties configuration = getConfiguration();
/**
* The lazily fetched classes
*/
private static final ConcurrentMap> classes = new ConcurrentHashMap>();
/**
* Tells whether the given content type is supported
*
* @return true if given content type is supported
*/
public static boolean isSupported(
String mimeType
){
return configuration.containsKey(mimeType);
}
/**
* Create a an XML Output Factory instance
*
* @param mimeType
*
* @return a new XML Output Factory
*
* @throws XMLStreamException if no factory can be provided for the given MIME type
*/
public static XMLOutputFactory newInstance(
String mimeType
) throws BasicException {
Class factoryClass = XMLOutputFactories.classes.get(mimeType);
if(factoryClass == null) {
String factoryName = configuration.getProperty(mimeType);
if(factoryName == null) {
throw BasicException.newStandAloneExceptionStack(
BasicException.Code.DEFAULT_DOMAIN,
BasicException.Code.BAD_PARAMETER,
"No XMLOutputFactory configured for the given MIME type",
new BasicException.Parameter("mime-type", mimeType)
);
}
try {
XMLOutputFactories.classes.put(
mimeType,
factoryClass = Classes.getApplicationClass(factoryName)
);
} catch (ClassNotFoundException exception) {
throw BasicException.newStandAloneExceptionStack(
exception,
BasicException.Code.DEFAULT_DOMAIN,
BasicException.Code.BAD_PARAMETER,
"XMLOutputFactory class for the given MIME type not found",
new BasicException.Parameter("mime-type", mimeType),
new BasicException.Parameter("class", factoryName)
);
}
}
try {
XMLOutputFactory factory = factoryClass.newInstance();
if(factory.isPropertySupported(MIME_TYPE)) {
factory.setProperty(MIME_TYPE, mimeType);
}
return factory;
} catch (Exception exception) {
throw BasicException.newStandAloneExceptionStack(
exception,
BasicException.Code.DEFAULT_DOMAIN,
BasicException.Code.BAD_PARAMETER,
"XMLOutputFactory class for the given MIME type could not be instantiated",
new BasicException.Parameter("mime-type", mimeType),
new BasicException.Parameter("class", factoryClass.getName())
);
}
}
/**
* Retrieve the configuration
*/
private static Properties getConfiguration(
) {
Properties configuration = new Properties();
for(URL url : Resources.getMetaInfResources(XMLOutputFactories.class.getClassLoader(), "openmdx-xml-outputfactory.properties")) {
try (InputStream source = url.openStream()){
configuration.load(source);
} catch (IOException exception) {
SysLog.warning("XML output factory configuration failure: " + url, exception);
}
}
if(configuration.isEmpty()) {
SysLog.warning("Empty XML output factory configuration");
}
return configuration;
}
}
