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//
// ========================================================================
// Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.osgi.boot.utils;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Dictionary;
import java.util.List;
import java.util.StringTokenizer;
/**
* Util
*
* Various useful functions used widely.
*/
public class Util
{
public static final String DEFAULT_DELIMS = ",;";
/**
* Get the value of a manifest header.
*
* @param name the name of the header
* @param altName an alternative name for the header (useful for deprecated names)
* @param manifest
* @return
*/
public static String getManifestHeaderValue (String name, String altName, Dictionary manifest)
{
if (manifest == null)
return null;
if (name == null && altName == null)
return null;
if (name != null)
return (String)manifest.get(name);
return (String)manifest.get(altName);
}
/* ------------------------------------------------------------ */
/**
* Treating the string as a separated list of filenames,
* convert and return the list of urls.
*
* @param val the separated list
* @param delims the separators (default is ,;)
* @return
* @throws MalformedURLException
*/
public static List<URL> fileNamesAsURLs(String val, String delims)
throws Exception
{
String separators = DEFAULT_DELIMS;
if (delims == null)
delims = separators;
StringTokenizer tokenizer = new StringTokenizer(val, delims, false);
List<URL> urls = new ArrayList<URL>();
while (tokenizer.hasMoreTokens())
{
urls.add(BundleFileLocatorHelperFactory.getFactory().getHelper().getLocalURL(new URL(tokenizer.nextToken())));
}
return urls;
}
/* ------------------------------------------------------------ */
public static void setProperty(Dictionary<String,String> properties, String key, String value)
{
if (value != null)
{
properties.put(key, value);
}
}
/* ------------------------------------------------------------ */
/**
* recursively substitute the ${sysprop} by their actual system property.
* ${sysprop,defaultvalue} will use 'defaultvalue' as the value if no
* sysprop is defined. Not the most efficient code but we are shooting for
* simplicity and speed of development here.
*
* @param value
* @return
*/
public static String resolvePropertyValue(String value)
{
int ind = value.indexOf("${");
if (ind == -1) { return value; }
int ind2 = value.indexOf('}', ind);
if (ind2 == -1) { return value; }
String sysprop = value.substring(ind + 2, ind2);
String defaultValue = null;
int comma = sysprop.indexOf(',');
if (comma != -1 && comma + 1 != sysprop.length())
{
defaultValue = sysprop.substring(comma + 1);
defaultValue = resolvePropertyValue(defaultValue);
sysprop = sysprop.substring(0, comma);
}
else
{
defaultValue = "${" + sysprop + "}";
}
String v = System.getProperty(sysprop);
String reminder = value.length() > ind2 + 1 ? value.substring(ind2 + 1) : "";
reminder = resolvePropertyValue(reminder);
if (v != null)
{
return value.substring(0, ind) + v + reminder;
}
else
{
return value.substring(0, ind) + defaultValue + reminder;
}
}
}
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