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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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 org.apache.pdfbox.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.util.Properties;
/**
* This class will handle loading resource files(AFM/CMAP).
*
* @author Ben Litchfield
* @version $Revision: 1.9 $
*/
public class ResourceLoader
{
/**
* private constructor for utility class.
*/
private ResourceLoader()
{
//private utility class
}
/**
* This will attempt to load the resource given the resource name.
*
* @param resourceName The resource to try and load.
*
* @return The resource as a stream or null if it could not be found.
*
* @throws IOException If there is an error while attempting to load the resource.
*/
public static InputStream loadResource( String resourceName ) throws IOException
{
ClassLoader loader = null;
try
{
loader = ResourceLoader.class.getClassLoader();
}
catch (SecurityException ex)
{
// PDFBOX-1946 ignore and try other alternatives
}
InputStream is = null;
if( loader != null )
{
is = loader.getResourceAsStream( resourceName );
}
//see sourceforge bug 863053, this is a fix for a user that
//needed to have PDFBox loaded by the bootstrap classloader
try
{
if (is == null)
{
loader = ClassLoader.getSystemClassLoader();
if( loader != null )
{
is = loader.getResourceAsStream( resourceName );
}
}
if( is == null )
{
File f = new File( resourceName );
if( f.exists() )
{
is = new FileInputStream( f );
}
}
}
catch (SecurityException ex)
{
// PDFBOX-1946 ignore and continue
}
return is;
}
/**
* This will attempt to load the resource given the resource name.
*
* @param resourceName The resource to try and load.
* @param failIfNotFound Throw an error message if the properties were not found.
*
* @return The resource as a stream or null if it could not be found.
*
* @throws IOException If there is an error loading the properties.
*/
public static Properties loadProperties( String resourceName, boolean failIfNotFound ) throws IOException
{
Properties properties = null;
InputStream is = null;
try
{
is = loadResource( resourceName );
if( is != null )
{
properties = new Properties();
properties.load( is );
}
else
{
if( failIfNotFound )
{
throw new IOException( "Error: could not find resource '" + resourceName + "' on classpath." );
}
}
}
finally
{
if( is != null )
{
is.close();
}
}
return properties;
}
/**
* This will attempt to load the resource given the resource name.
*
* @param resourceName The resource to try and load.
* @param defaults A stream of default properties.
*
* @return The resource as a stream or null if it could not be found.
*
* @throws IOException If there is an error loading the properties.
*/
public static Properties loadProperties( String resourceName, Properties defaults ) throws IOException
{
InputStream is = null;
try
{
is = loadResource( resourceName );
if( is != null )
{
defaults.load( is );
}
}
finally
{
if( is != null )
{
is.close();
}
}
return defaults;
}
}