/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2003 The Apache Software Foundation. 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 acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation", "Tapestry"
* must not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* or "Tapestry", nor may "Apache" or "Tapestry" appear in their
* name, without prior written permission of the Apache Software Foundation.
*
* 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 TAPESTRY CONTRIBUTOR COMMUNITY
* 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 Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.tapestry.engine;
import java.util.HashMap;
import java.util.Map;
import org.apache.tapestry.ApplicationRuntimeException;
import org.apache.tapestry.IResourceLocation;
import org.apache.tapestry.IResourceResolver;
import org.apache.tapestry.IScript;
import org.apache.tapestry.Tapestry;
import org.apache.tapestry.script.ScriptParser;
import org.apache.tapestry.util.xml.DocumentParseException;
/**
* Provides basic access to scripts available on the classpath. Scripts are cached in
* memory once parsed.
*
* @author Howard Lewis Ship
* @version $Id: DefaultScriptSource.java,v 1.3 2003/05/28 13:41:39 hlship Exp $
* @since 1.0.2
*
**/
public class DefaultScriptSource implements IScriptSource
{
private IResourceResolver _resolver;
private Map _cache = new HashMap();
public DefaultScriptSource(IResourceResolver resolver)
{
_resolver = resolver;
}
public synchronized void reset()
{
_cache.clear();
}
public synchronized IScript getScript(IResourceLocation scriptLocation)
{
IScript result = (IScript) _cache.get(scriptLocation);
if (result != null)
return result;
result = parse(scriptLocation);
_cache.put(scriptLocation, result);
return result;
}
private IScript parse(IResourceLocation location)
{
ScriptParser parser = new ScriptParser(_resolver);
try
{
return parser.parse(location);
}
catch (DocumentParseException ex)
{
throw new ApplicationRuntimeException(
Tapestry.format("DefaultScriptSource.unable-to-parse-script", location),
ex);
}
}
public String toString()
{
StringBuffer buffer = new StringBuffer("DefaultScriptSource@");
buffer.append(Integer.toHexString(hashCode()));
buffer.append('[');
if (_cache != null)
{
synchronized (_cache)
{
buffer.append(_cache.keySet());
}
buffer.append(", ");
}
buffer.append("]");
return buffer.toString();
}
}