/*
* Copyright 2011 cruxframework.org.
*
* 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 org.cruxframework.crux.core.utils;
import java.io.File;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.net.URL;
import org.cruxframework.crux.scanner.URLStreamManager;
/**
* @author Thiago da Rosa de Bustamante
*
*/
public class URLUtils
{
/**
* Returns <code>true</code> if the resource referred by an URL really exists
* @param url
* @return
*/
public static boolean existsResource(URL url)
{
boolean result = false;
if (url != null)
{
if ("file".equals(url.getProtocol()))
{
try
{
result = new File(url.toURI()).exists();
}
catch (URISyntaxException e)
{
result = false;
}
}
else
{
URLStreamManager manager = new URLStreamManager(url);
InputStream stream = manager.open();
manager.close();
result = stream != null;
}
}
return result;
}
/**
* @param urlString
* @return
*/
public static URL isValidURL(String urlString)
{
try
{
return new URL(urlString);
}
catch (Exception e)
{
return null;
}
}
public static boolean isIdenticResource(URL view1, URL view2, String resourceId)
{
if (!view1.toString().equals(view2.toString()))
{
if (view1.getProtocol().equals(view2.getProtocol()) && view1.getProtocol().equals("file"))
{
File file1;
File file2;
try
{
file1 = new File(view1.toURI());
file2 = new File(view2.toURI());
}
catch (Exception e)
{
throw new ResourceException("Invalid url for resource ["+resourceId+"].", e);
}
if (file1.length() == file2.length())
{
String view1Content;
String view2Content;
try
{
view1Content = FileUtils.read(file1);
view2Content = FileUtils.read(file1);
}
catch (Exception e)
{
throw new ResourceException("Can not read the resource file. View ID["+resourceId+"].", e);
}
if (!view1Content.equals(view2Content))
{
return false;
}
}
else
{
return false;
}
}
else
{
return false;
}
}
return true;
}
public static class ResourceException extends RuntimeException
{
private static final long serialVersionUID = -2282344306575624565L;
public ResourceException(String message, Throwable cause)
{
super(message, cause);
}
}
}