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// Copyright (C) 2001-2003 Jon A. Maxwell (JAM)
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
package net.sourceforge.jnlp.cache;
import static net.sourceforge.jnlp.runtime.Translator.R;
import java.io.*;
import java.net.*;
import net.sourceforge.jnlp.*;
import net.sourceforge.jnlp.runtime.*;
import net.sourceforge.jnlp.util.*;
/**
* Describes an entry in the cache.<p>
*
* @author <a href="mailto:jmaxwell@users.sourceforge.net">Jon A. Maxwell (JAM)</a> - initial author
* @version $Revision: 1.10 $
*/
public class CacheEntry {
/** the remote resource location */
private URL location;
/** the requested version */
private Version version;
/** info about the cached file */
private PropertiesFile properties;
/**
* Create a CacheEntry for the resources specified as a remote
* URL.
*
* @param location the remote resource location
* @param version the version of the resource
*/
public CacheEntry(URL location, Version version) {
this.location = location;
this.version = version;
File infoFile = CacheUtil.getCacheFile(location, version);
infoFile = new File(infoFile.getPath() + ".info"); // replace with something that can't be clobbered
properties = new PropertiesFile(infoFile, R("CAutoGen"));
}
/**
* Initialize the cache entry data from a connection to the
* remote resource (does not store data).
*/
void initialize(URLConnection connection) {
long modified = connection.getLastModified();
long length = connection.getContentLength(); // an int
properties.setProperty("content-length", Long.toString(length));
properties.setProperty("last-modified", Long.toString(modified));
}
/**
* Returns the remote location this entry caches.
*/
public URL getLocation() {
return location;
}
/**
* Returns the time in the local system clock that the file was
* most recently checked for an update.
*/
public long getLastUpdated() {
try {
return Long.parseLong(properties.getProperty("last-updated"));
} catch (Exception ex) {
return 0;
}
}
/**
* Sets the time in the local system clock that the file was
* most recently checked for an update.
*/
public void setLastUpdated(long updatedTime) {
properties.setProperty("last-updated", Long.toString(updatedTime));
}
/**
* Returns whether there is a version of the URL contents in
* the cache and it is up to date. This method may not return
* immediately.
*
* @param connection a connection to the remote URL
* @return whether the cache contains the version
*/
public boolean isCurrent(URLConnection connection) {
boolean cached = isCached();
if (!cached)
return false;
try {
long remoteModified = connection.getLastModified();
long cachedModified = Long.parseLong(properties.getProperty("last-modified"));
if (remoteModified > 0 && remoteModified <= cachedModified)
return true;
else
return false;
} catch (Exception ex) {
if (JNLPRuntime.isDebug())
ex.printStackTrace();
return cached; // if can't connect return whether already in cache
}
}
/**
* Returns true if the cache has a local copy of the contents
* of the URL matching the specified version string.
*
* @return true if the resource is in the cache
*/
public boolean isCached() {
File localFile = CacheUtil.getCacheFile(location, version);
if (!localFile.exists())
return false;
try {
long cachedLength = localFile.length();
long remoteLength = Long.parseLong(properties.getProperty("content-length", "-1"));
if (remoteLength >= 0 && cachedLength != remoteLength)
return false;
else
return true;
} catch (Exception ex) {
if (JNLPRuntime.isDebug())
ex.printStackTrace();
return false; // should throw?
}
}
/**
* Save the current information for the cache entry.
*/
protected void store() {
properties.store();
}
/**
* Mark this entry for deletion at shutdown.
*/
public void markForDelete() { // once marked it should not be unmarked.
properties.setProperty("delete", Boolean.toString(true));
}
/**
* Lock cache item.
*/
protected void lock() {
CacheUtil.lockFile(properties);
}
/**
* Unlock cache item.
*/
protected void unlock() {
CacheUtil.unlockFile(properties);
}
}
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