org.apache.myfaces.shared_impl.resource.ResourceLoader Maven / Gradle / Ivy
/*
* 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.myfaces.shared_impl.resource;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Comparator;
/**
* Base class for resource loaders. Resource loaders can lookup resources
* as URLs from arbitrary locations, including JAR files.
*
* @author Leonardo Uribe (latest modification by $Author: lu4242 $)
* @version $Revision: 882702 $ $Date: 2009-11-20 15:16:07 -0500 (Vie, 20 Nov 2009) $
*/
public abstract class ResourceLoader
{
public static final String VERSION_INVALID = "INVALID";
private String _prefix;
public ResourceLoader(String prefix)
{
_prefix = prefix;
}
public abstract String getResourceVersion(String path);
/**
* Return the max available version found (if exists) or
* return null if no version available.
*/
public abstract String getLibraryVersion(String path);
/**
* Return the max available version found (if exists) or
* return null if no version available.
*/
public abstract URL getResourceURL(ResourceMeta resourceMeta);
public abstract InputStream getResourceInputStream(ResourceMeta resourceMeta);
public abstract ResourceMeta createResourceMeta(String prefix, String libraryName, String libraryVersion,
String resourceName, String resourceVersion);
public abstract boolean libraryExists(String libraryName);
private Comparator _versionComparator = null;
protected Comparator getVersionComparator()
{
if (_versionComparator == null)
{
_versionComparator = new VersionComparator();
}
return _versionComparator;
}
protected void setVersionComparator(Comparator versionComparator)
{
_versionComparator = versionComparator;
}
public class VersionComparator implements Comparator
{
public int compare(String s1, String s2)
{
int n1 = 0;
int n2 = 0;
String o1 = s1;
String o2 = s2;
boolean p1 = true;
boolean p2 = true;
while (n1 == n2 && (p1 || p2))
{
int i1 = o1.indexOf('_');
int i2 = o2.indexOf('_');
if (i1 < 0)
{
if (o1.length() > 0)
{
p1 = false;
n1 = Integer.valueOf(o1);
o1 = "";
}
else
{
p1 = false;
n1 = 0;
}
}
else
{
n1 = Integer.valueOf(o1.substring(0, i1));
o1 = o1.substring(i1 + 1);
}
if (i2 < 0)
{
if (o2.length() > 0)
{
p2 = false;
n2 = Integer.valueOf(o2);
o2 = "";
}
else
{
p2 = false;
n2 = 0;
}
}
else
{
n2 = Integer.valueOf(o2.substring(0, i2));
o2 = o2.substring(i2 + 1);
}
}
if (n1 == n2)
{
return s1.length() - s2.length();
}
return n1 - n2;
}
}
public String getPrefix()
{
return _prefix;
}
public void setPrefix(String prefix)
{
_prefix = prefix;
}
}