/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 com.hp.hpl.jena.util;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList ;
import java.util.InvalidPropertiesFormatException;
import java.util.List ;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.hp.hpl.jena.shared.JenaException;
/**
* Pluck data out of the ether - or failing that, read it from a properties file.
* Assumes the properties file is in the "right place" through configuration of the build or compile processes.
*/
public class Metadata
{
private static Logger log = LoggerFactory.getLogger(Metadata.class) ;
List<String> resources = new ArrayList<String>() ;
Properties properties = new Properties() ;
public Metadata() { }
public Metadata(String resourceName)
{
this() ;
addMetadata(resourceName) ;
}
public void addMetadata(String resourceName)
{
resources.add(resourceName) ;
read(properties, resourceName) ;
}
private static void read(Properties properties, String resource)
{
ClassLoader classLoader = SystemUtils.chooseClassLoader() ;
if (classLoader == null)
classLoader = Metadata.class.getClassLoader();
if ( classLoader == null )
{
log.error( "No classloader") ;
return ;
}
InputStream in = classLoader.getResourceAsStream ( resource ) ;
if ( in == null )
// throw new JenaException ( "Failed to find the properties file" ) ;
// In development, there is no properties file.
return ;
try
{
properties.loadFromXML ( in ) ;
}
catch ( InvalidPropertiesFormatException ex )
{
throw new JenaException ( "Invalid properties file", ex ) ;
}
catch ( IOException ex )
{
throw new JenaException ( "Metadata ==> IOException", ex ) ;
}
}
public String get(String name) { return get(name, null) ; }
public String get(String name, String defaultValue)
{
if ( properties == null ) return defaultValue ;
return properties.getProperty(name, defaultValue) ;
}
}