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/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2009 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.resourceloader.loader;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import org.pentaho.reporting.libraries.resourceloader.ResourceKeyCreationException;
/**
* Creation-Date: 05.04.2006, 16:02:53
*
* @author Thomas Morgner
*/
public class LoaderUtils
{
private LoaderUtils()
{
}
public static String stripLeadingSlashes(String s)
{
int leadingSlashes = 0;
while (s.length() > leadingSlashes && s.charAt(leadingSlashes) == '/')
{
leadingSlashes += 1;
}
if (leadingSlashes == 0)
{
return s;
}
return s.substring(leadingSlashes);
}
/**
* Merges two paths. A path is recognized as an absolute path, if
* it has an URL-schema definition attached. A parent is recognized as
* container path (a directory, in the common language), if it ends with
* a slash.
*
* Todo: Introduce escaping using "\" as escape char.
*
* @param parent
* @param child
* @return
* @throws ResourceKeyCreationException
*/
public static String mergePaths(final String parent,
final String child)
throws ResourceKeyCreationException
{
final int childPrefix = child.indexOf("://");
if (childPrefix > 0)
{
return child;
}
final String parentResource;
final String parentPrefix;
final int parentPrefixPos = parent.indexOf("://");
if (parentPrefixPos > 0)
{
parentResource = parent.substring(parentPrefixPos + 3);
parentPrefix = parent.substring(0, parentPrefixPos + 3);
}
else
{
parentResource = parent;
parentPrefix = "";
}
final List parentList;
if (parentResource.length() > 0 && parentResource.charAt(parentResource.length() - 1) == '/')
{
parentList = parseName(parentResource, false);
}
else
{
parentList = parseName(parentResource, true);
}
// construct the full name ...
parentList.addAll(parseName(child, false));
// and normalize it by removing all '.' and '..' elements.
final ArrayList normalizedList = new ArrayList();
for (int i = 0; i < parentList.size(); i++)
{
final String o = (String) parentList.get(i);
if (".".equals(o))
{
continue;
}
if ("..".equals(o))
{
if (normalizedList.isEmpty() == false)
{
// remove last element
normalizedList.remove(normalizedList.size() - 1);
}
}
else
{
normalizedList.add(o);
}
}
if (normalizedList.isEmpty())
{
throw new ResourceKeyCreationException("Unable to build a valid key.");
}
final StringBuffer buffer = new StringBuffer();
buffer.append(parentPrefix);
for (int i = 0; i < normalizedList.size(); i++)
{
final String s = (String) normalizedList.get(i);
if (i > 0)
{
buffer.append('/');
}
buffer.append(s);
}
return buffer.toString();
}
/**
* Parses the given name and returns the name elements as List of Strings.
*
* @param name the name, that should be parsed.
* @return the parsed name.
*/
private static List parseName(final String name, final boolean skipLast)
{
final ArrayList list = new ArrayList();
final StringTokenizer strTok = new StringTokenizer(name, "/");
while (strTok.hasMoreElements())
{
final String s = (String) strTok.nextElement();
if (s.length() != 0)
{
list.add(s);
}
}
if (skipLast && list.isEmpty() == false)
{
list.remove(list.size() - 1);
}
return list;
}
/**
* Extracts the file name from a path name.
*
* @param file the path name.
* @return the extracted filename.
*/
public static String getFileName(final String file)
{
final int last = file.lastIndexOf('/');
if (last < 0)
{
return file;
}
return file.substring(last + 1);
}
}
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