freemarker.cache.URLTemplateSource Maven / Gradle / Ivy
Go to download
Google App Engine compliant variation of FreeMarker.
FreeMarker is a "template engine"; a generic tool to generate text output based on templates.
/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.cache;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.JarURLConnection;
import java.net.URLConnection;
/**
* Wraps a java.net.URL, and implements methods required for a typical template source.
* @version $Id: URLTemplateSource.java,v 1.4 2003/04/02 11:43:18 szegedia Exp $
* @author Daniel Dekany
* @author TJ Laurenzo
*/
class URLTemplateSource {
private final URL url;
private URLConnection conn;
private InputStream inputStream;
URLTemplateSource(URL url) throws IOException {
this.url = url;
this.conn = url.openConnection();
}
public boolean equals(Object o) {
if (o instanceof URLTemplateSource) {
return url.equals(((URLTemplateSource) o).url);
} else {
return false;
}
}
public int hashCode() {
return url.hashCode();
}
public String toString() {
return url.toString();
}
long lastModified() {
if (conn instanceof JarURLConnection) {
// There is a bug in sun's jar url connection that causes file handle leaks when calling getLastModified()
// Since the time stamps of jar file contents can't vary independent from the jar file timestamp, just use
// the jar file timestamp
URL jarURL=((JarURLConnection)conn).getJarFileURL();
if (jarURL.getProtocol().equals("file")) {
// Return the last modified time of the underlying file - saves some opening and closing
return new File(jarURL.getFile()).lastModified();
} else {
// Use the URL mechanism
URLConnection jarConn=null;
try {
jarConn=jarURL.openConnection();
return jarConn.getLastModified();
} catch (IOException e) {
return -1;
} finally {
try {
if (jarConn!=null) jarConn.getInputStream().close();
} catch (IOException e) { }
}
}
} else {
long lastModified = conn.getLastModified();
if (lastModified == -1L && url.getProtocol().equals("file")) {
// Hack for obtaining accurate last modified time for
// URLs that point to the local file system. This is fixed
// in JDK 1.4, but prior JDKs returns -1 for file:// URLs.
return new File(url.getFile()).lastModified();
} else {
return lastModified;
}
}
}
InputStream getInputStream() throws IOException {
inputStream = conn.getInputStream();
return inputStream;
}
void close() throws IOException {
try {
if (inputStream != null) {
inputStream.close();
} else {
conn.getInputStream().close();
}
} finally {
inputStream = null;
conn = null;
}
}
}