/*******************************************************************************
* Copyright 2012 Geoscience Australia
*
* Licensed 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 au.gov.ga.earthsci.worldwind.common.util.transform;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Maintains a static list of {@link URLTransform}'s that can be applied in
* order using the {@link #transform} methods.
* <p/>
* Examples of {@link URLTransform}s might be to change the port number based on
* the current environment, or append request parameters to URLs matching a
* given pattern.
*
* @author Michael de Hoog (michael.dehoog@ga.gov.au)
*/
public class URLTransformer
{
private static List<URLTransform> transforms = new ArrayList<URLTransform>();
public synchronized static void addTransform(URLTransform transform)
{
transforms.add(transform);
}
public synchronized static void removeTransform(URLTransform transform)
{
transforms.remove(transform);
}
public synchronized static URL transform(URL url) throws MalformedURLException
{
if (url == null)
return null;
return new URL(transform(url.toExternalForm()));
}
public synchronized static String transform(String url)
{
if (url == null)
return null;
for (URLTransform transform : transforms)
{
url = transform.transformURL(url);
}
return url;
}
public synchronized static void clearTransforms()
{
transforms.clear();
}
public static List<URLTransform> getTransforms()
{
return Collections.unmodifiableList(transforms);
}
}