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package org.apache.tuscany.maven.zip;
/*
* 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.
*/
import org.codehaus.plexus.util.IOUtil;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;
/**
* @author <a href="mailto:kenney@neonics.com">Kenney Westerhof</a>
* @version $Id: PropertyUtils.java 480784 2006-11-30 00:07:45Z jvanzyl $
* @todo this is duplicated from the resources plugin - migrate to plexus-utils
*/
public final class PropertyUtils
{
private PropertyUtils()
{
// prevent instantiation
}
/**
* Reads a property file, resolving all internal variables.
*
* @param propfile The property file to load
* @param fail wheter to throw an exception when the file cannot be loaded or to return null
* @param useSystemProps wheter to incorporate System.getProperties settings into the returned Properties object.
* @return the loaded and fully resolved Properties object
*/
public static Properties loadPropertyFile( File propfile, boolean fail, boolean useSystemProps )
throws IOException
{
Properties props = new Properties();
if ( useSystemProps )
{
props = new Properties( System.getProperties() );
}
if ( propfile.exists() )
{
FileInputStream inStream = new FileInputStream( propfile );
try
{
props.load( inStream );
}
finally
{
IOUtil.close( inStream );
}
}
else if ( fail )
{
throw new FileNotFoundException( propfile.toString() );
}
for ( Enumeration n = props.propertyNames(); n.hasMoreElements(); )
{
String k = (String) n.nextElement();
props.setProperty( k, PropertyUtils.getPropertyValue( k, props ) );
}
return props;
}
/**
* Retrieves a property value, replacing values like ${token}
* using the Properties to look them up.
* <p/>
* It will leave unresolved properties alone, trying for System
* properties, and implements reparsing (in the case that
* the value of a property contains a key), and will
* not loop endlessly on a pair like
* test = ${test}.
*/
private static String getPropertyValue( String k, Properties p )
{
// This can also be done using InterpolationFilterReader,
// but it requires reparsing the file over and over until
// it doesn't change.
String v = p.getProperty( k );
String ret = "";
int idx, idx2;
while ( ( idx = v.indexOf( "${" ) ) >= 0 )
{
// append prefix to result
ret += v.substring( 0, idx );
// strip prefix from original
v = v.substring( idx + 2 );
// if no matching } then bail
if ( ( idx2 = v.indexOf( '}' ) ) < 0 )
{
break;
}
// strip out the key and resolve it
// resolve the key/value for the ${statement}
String nk = v.substring( 0, idx2 );
v = v.substring( idx2 + 1 );
String nv = p.getProperty( nk );
// try global environment..
if ( nv == null )
{
nv = System.getProperty( nk );
}
// if the key cannot be resolved,
// leave it alone ( and don't parse again )
// else prefix the original string with the
// resolved property ( so it can be parsed further )
// taking recursion into account.
if ( nv == null || nv.equals( k ) )
{
ret += "${" + nk + "}";
}
else
{
v = nv + v;
}
}
return ret + v;
}
}
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