package org.apache.velocity.context;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import java.util.HashMap;
import java.util.Stack;
import org.apache.velocity.app.event.EventCartridge;
import org.apache.velocity.runtime.resource.Resource;
import org.apache.velocity.util.introspection.IntrospectionCacheData;
/**
* class to encapsulate the 'stuff' for internal operation of velocity.
* We use the context as a thread-safe storage : we take advantage of the
* fact that it's a visitor of sorts to all nodes (that matter) of the
* AST during init() and render().
* Currently, it carries the template name for namespace
* support, as well as node-local context data introspection caching.
*
* Note that this is not a public class. It is for package access only to
* keep application code from accessing the internals, as AbstractContext
* is derived from this.
*
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id: InternalContextBase.java 463298 2006-10-12 16:10:32Z henning $
*/
class InternalContextBase implements InternalHousekeepingContext, InternalEventContext
{
/**
* Version Id for serializable
*/
private static final long serialVersionUID = -245905472770843470L;
/**
* cache for node/context specific introspection information
*/
private HashMap introspectionCache = new HashMap(33);
/**
* Template name stack. The stack top contains the current template name.
*/
private Stack templateNameStack = new Stack();
/**
* EventCartridge we are to carry. Set by application
*/
private EventCartridge eventCartridge = null;
/**
* Current resource - used for carrying encoding and other
* information down into the rendering process
*/
private Resource currentResource = null;
/**
* Is rendering allowed? Defaults to true, can be changed by #stop directive.
*/
private boolean allowRendering = true;
/**
* set the current template name on top of stack
*
* @param s current template name
*/
public void pushCurrentTemplateName( String s )
{
templateNameStack.push(s);
}
/**
* remove the current template name from stack
*/
public void popCurrentTemplateName()
{
templateNameStack.pop();
}
/**
* get the current template name
*
* @return String current template name
*/
public String getCurrentTemplateName()
{
if ( templateNameStack.empty() )
return "<undef>";
else
return (String) templateNameStack.peek();
}
/**
* get the current template name stack
*
* @return Object[] with the template name stack contents.
*/
public Object[] getTemplateNameStack()
{
return templateNameStack.toArray();
}
/**
* returns an IntrospectionCache Data (@see IntrospectionCacheData)
* object if exists for the key
*
* @param key key to find in cache
* @return cache object
*/
public IntrospectionCacheData icacheGet( Object key )
{
return ( IntrospectionCacheData ) introspectionCache.get( key );
}
/**
* places an IntrospectionCache Data (@see IntrospectionCacheData)
* element in the cache for specified key
*
* @param key key
* @param o IntrospectionCacheData object to place in cache
*/
public void icachePut( Object key, IntrospectionCacheData o )
{
introspectionCache.put( key, o );
}
/**
* @see org.apache.velocity.context.InternalHousekeepingContext#setCurrentResource(org.apache.velocity.runtime.resource.Resource)
*/
public void setCurrentResource( Resource r )
{
currentResource = r;
}
/**
* @see org.apache.velocity.context.InternalHousekeepingContext#getCurrentResource()
*/
public Resource getCurrentResource()
{
return currentResource;
}
/**
* @see org.apache.velocity.context.InternalHousekeepingContext#getAllowRendering()
*/
public boolean getAllowRendering()
{
return allowRendering;
}
/**
* @see org.apache.velocity.context.InternalHousekeepingContext#setAllowRendering(boolean)
*/
public void setAllowRendering(boolean v)
{
allowRendering = v;
}
/**
* @see org.apache.velocity.context.InternalEventContext#attachEventCartridge(org.apache.velocity.app.event.EventCartridge)
*/
public EventCartridge attachEventCartridge( EventCartridge ec )
{
EventCartridge temp = eventCartridge;
eventCartridge = ec;
return temp;
}
/**
* @see org.apache.velocity.context.InternalEventContext#getEventCartridge()
*/
public EventCartridge getEventCartridge()
{
return eventCartridge;
}
}