org.mortbay.resource.Resource Maven / Gradle / Ivy
// ========================================================================
// Copyright 1996-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.mortbay.resource;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.text.DateFormat;
import java.util.Arrays;
import java.util.Date;
import org.mortbay.log.Log;
import org.mortbay.util.IO;
import org.mortbay.util.Loader;
import org.mortbay.util.StringUtil;
import org.mortbay.util.URIUtil;
/* ------------------------------------------------------------ */
/** Abstract resource class.
*
* @author Nuno Pregui�a
* @author Greg Wilkins (gregw)
*/
public abstract class Resource implements Serializable
{
public static boolean __defaultUseCaches = true;
Object _associate;
/**
* Change the default setting for url connection caches.
* Subsequent URLConnections will use this default.
* @param useCaches
*/
public static void setDefaultUseCaches (boolean useCaches)
{
__defaultUseCaches=useCaches;
}
public static boolean getDefaultUseCaches ()
{
return __defaultUseCaches;
}
/* ------------------------------------------------------------ */
/** Construct a resource from a url.
* @param url A URL.
* @return A Resource object.
*/
public static Resource newResource(URL url)
throws IOException
{
return newResource(url, __defaultUseCaches);
}
/* ------------------------------------------------------------ */
/**
* Construct a resource from a url.
* @param url the url for which to make the resource
* @param useCaches true enables URLConnection caching if applicable to the type of resource
* @return
*/
public static Resource newResource(URL url, boolean useCaches)
{
if (url==null)
return null;
String url_string=url.toExternalForm();
if( url_string.startsWith( "file:"))
{
try
{
FileResource fileResource= new FileResource(url);
return fileResource;
}
catch(Exception e)
{
Log.debug(Log.EXCEPTION,e);
return new BadResource(url,e.toString());
}
}
else if( url_string.startsWith( "jar:file:"))
{
return new JarFileResource(url, useCaches);
}
else if( url_string.startsWith( "jar:"))
{
return new JarResource(url, useCaches);
}
return new URLResource(url,null,useCaches);
}
/* ------------------------------------------------------------ */
/** Construct a resource from a string.
* @param resource A URL or filename.
* @return A Resource object.
*/
public static Resource newResource(String resource)
throws MalformedURLException, IOException
{
return newResource(resource, __defaultUseCaches);
}
/* ------------------------------------------------------------ */
/** Construct a resource from a string.
* @param resource A URL or filename.
* @param useCaches controls URLConnection caching
* @return A Resource object.
*/
public static Resource newResource (String resource, boolean useCaches)
throws MalformedURLException, IOException
{
URL url=null;
try
{
// Try to format as a URL?
url = new URL(resource);
}
catch(MalformedURLException e)
{
if(!resource.startsWith("ftp:") &&
!resource.startsWith("file:") &&
!resource.startsWith("jar:"))
{
try
{
// It's a file.
if (resource.startsWith("./"))
resource=resource.substring(2);
File file=new File(resource).getCanonicalFile();
url=new URL(URIUtil.encodePath(file.toURL().toString()));
URLConnection connection=url.openConnection();
connection.setUseCaches(useCaches);
FileResource fileResource= new FileResource(url,connection,file);
return fileResource;
}
catch(Exception e2)
{
Log.debug(Log.EXCEPTION,e2);
throw e;
}
}
else
{
Log.warn("Bad Resource: "+resource);
throw e;
}
}
// Make sure that any special characters stripped really are ignorable.
String nurl=url.toString();
if (nurl.length()>0 && nurl.charAt(nurl.length()-1)!=resource.charAt(resource.length()-1))
{
if ((nurl.charAt(nurl.length()-1)!='/' ||
nurl.charAt(nurl.length()-2)!=resource.charAt(resource.length()-1))
&&
(resource.charAt(resource.length()-1)!='/' ||
resource.charAt(resource.length()-2)!=nurl.charAt(nurl.length()-1)
))
{
return new BadResource(url,"Trailing special characters stripped by URL in "+resource);
}
}
return newResource(url);
}
/* ------------------------------------------------------------ */
/** Construct a system resource from a string.
* The resource is tried as classloader resource before being
* treated as a normal resource.
*/
public static Resource newSystemResource(String resource)
throws IOException
{
URL url=null;
// Try to format as a URL?
ClassLoader
loader=Thread.currentThread().getContextClassLoader();
if (loader!=null)
{
url=loader.getResource(resource);
if (url==null && resource.startsWith("/"))
url=loader.getResource(resource.substring(1));
}
if (url==null)
{
loader=Resource.class.getClassLoader();
if (loader!=null)
{
url=loader.getResource(resource);
if (url==null && resource.startsWith("/"))
url=loader.getResource(resource.substring(1));
}
}
if (url==null)
{
url=ClassLoader.getSystemResource(resource);
if (url==null && resource.startsWith("/"))
url=loader.getResource(resource.substring(1));
}
if (url==null)
return null;
return newResource(url);
}
/* ------------------------------------------------------------ */
/** Find a classpath resource.
*/
public static Resource newClassPathResource(String resource)
{
return newClassPathResource(resource,true,false);
}
/* ------------------------------------------------------------ */
/** Find a classpath resource.
* The {@java.lang.Class#getResource} method is used to lookup the resource. If it is not
* found, then the {@link Loader#getResource(Class, String, boolean)} method is used.
* If it is still not found, then {@link ClassLoader#getSystemResource(String)} is used.
* Unlike {@link #getSystemResource} this method does not check for normal resources.
* @param name The relative name of the resouce
* @param useCaches True if URL caches are to be used.
* @param checkParents True if forced searching of parent classloaders is performed to work around
* loaders with inverted priorities
* @return Resource or null
*/
public static Resource newClassPathResource(String name,boolean useCaches,boolean checkParents)
{
URL url=Resource.class.getResource(name);
if (url==null)
{
try
{
url=Loader.getResource(Resource.class,name,checkParents);
}
catch(ClassNotFoundException e)
{
url=ClassLoader.getSystemResource(name);
}
}
if (url==null)
return null;
return newResource(url,useCaches);
}
/* ------------------------------------------------------------ */
protected void finalize()
{
release();
}
/* ------------------------------------------------------------ */
/** Release any resources held by the resource.
*/
public abstract void release();
/* ------------------------------------------------------------ */
/**
* Returns true if the respresened resource exists.
*/
public abstract boolean exists();
/* ------------------------------------------------------------ */
/**
* Returns true if the respresenetd resource is a container/directory.
* If the resource is not a file, resources ending with "/" are
* considered directories.
*/
public abstract boolean isDirectory();
/* ------------------------------------------------------------ */
/**
* Returns the last modified time
*/
public abstract long lastModified();
/* ------------------------------------------------------------ */
/**
* Return the length of the resource
*/
public abstract long length();
/* ------------------------------------------------------------ */
/**
* Returns an URL representing the given resource
*/
public abstract URL getURL();
/* ------------------------------------------------------------ */
/**
* Returns an File representing the given resource or NULL if this
* is not possible.
*/
public abstract File getFile()
throws IOException;
/* ------------------------------------------------------------ */
/**
* Returns the name of the resource
*/
public abstract String getName();
/* ------------------------------------------------------------ */
/**
* Returns an input stream to the resource
*/
public abstract InputStream getInputStream()
throws java.io.IOException;
/* ------------------------------------------------------------ */
/**
* Returns an output stream to the resource
*/
public abstract OutputStream getOutputStream()
throws java.io.IOException, SecurityException;
/* ------------------------------------------------------------ */
/**
* Deletes the given resource
*/
public abstract boolean delete()
throws SecurityException;
/* ------------------------------------------------------------ */
/**
* Rename the given resource
*/
public abstract boolean renameTo( Resource dest)
throws SecurityException;
/* ------------------------------------------------------------ */
/**
* Returns a list of resource names contained in the given resource
* The resource names are not URL encoded.
*/
public abstract String[] list();
/* ------------------------------------------------------------ */
/**
* Returns the resource contained inside the current resource with the
* given name.
* @param path The path segment to add, which should be encoded by the
* encode method.
*/
public abstract Resource addPath(String path)
throws IOException,MalformedURLException;
/* ------------------------------------------------------------ */
/** Encode according to this resource type.
* The default implementation calls URI.encodePath(uri)
* @param uri
* @return String encoded for this resource type.
*/
public String encode(String uri)
{
return URIUtil.encodePath(uri);
}
/* ------------------------------------------------------------ */
public Object getAssociate()
{
return _associate;
}
/* ------------------------------------------------------------ */
public void setAssociate(Object o)
{
_associate=o;
}
/* ------------------------------------------------------------ */
/**
* @return The canonical Alias of this resource or null if none.
*/
public URL getAlias()
{
return null;
}
/* ------------------------------------------------------------ */
/** Get the resource list as a HTML directory listing.
* @param base The base URL
* @param parent True if the parent directory should be included
* @return String of HTML
*/
public String getListHTML(String base,
boolean parent)
throws IOException
{
if (!isDirectory())
return null;
String[] ls = list();
if (ls==null)
return null;
Arrays.sort(ls);
String decodedBase = URIUtil.decodePath(base);
String title = "Directory: "+decodedBase;
StringBuffer buf=new StringBuffer(4096);
buf.append("");
buf.append(title);
buf.append(" \n");
buf.append(title);
buf.append("
");
if (parent)
{
buf.append("Parent Directory ");
buf.append(StringUtil.replace(StringUtil.replace(ls[i],"<","<"),">",">"));
buf.append(" ");
buf.append(" ");
buf.append(item.length());
buf.append(" bytes ");
buf.append(dfmt.format(new Date(item.lastModified())));
buf.append("
\n");
buf.append("\n");
return buf.toString();
}
/* ------------------------------------------------------------ */
/**
* @param out
* @param start First byte to write
* @param count Bytes to write or -1 for all of them.
*/
public void writeTo(OutputStream out,long start,long count)
throws IOException
{
InputStream in = getInputStream();
try
{
in.skip(start);
if (count<0)
IO.copy(in,out);
else
IO.copy(in,out,count);
}
finally
{
in.close();
}
}
}
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