Source Code Cross Referenced for InternalHousekeepingContext.java in  » Template-Engine » Velocity » org » apache » velocity » context » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Template Engine » Velocity » org.apache.velocity.context 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.velocity.context;
002:
003:        /*
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *   http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.    
020:         */
021:
022:        import org.apache.velocity.util.introspection.IntrospectionCacheData;
023:
024:        import org.apache.velocity.runtime.resource.Resource;
025:
026:        /**
027:         *  interface to encapsulate the 'stuff' for internal operation of velocity.
028:         *  We use the context as a thread-safe storage : we take advantage of the
029:         *  fact that it's a visitor  of sorts  to all nodes (that matter) of the
030:         *  AST during init() and render().
031:         *
032:         *  Currently, it carries the template name for namespace
033:         *  support, as well as node-local context data introspection caching.
034:         *
035:         *  @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
036:         *  @author <a href="mailto:Christoph.Reck@dlr.de">Christoph Reck</a>
037:         *  @version $Id: InternalHousekeepingContext.java 463298 2006-10-12 16:10:32Z henning $
038:         */
039:        interface InternalHousekeepingContext {
040:            /**
041:             *  set the current template name on top of stack
042:             *
043:             *  @param s current template name
044:             */
045:            void pushCurrentTemplateName(String s);
046:
047:            /**
048:             *  remove the current template name from stack
049:             */
050:            void popCurrentTemplateName();
051:
052:            /**
053:             *  get the current template name
054:             *
055:             *  @return String current template name
056:             */
057:            String getCurrentTemplateName();
058:
059:            /**
060:             *  Returns the template name stack in form of an array.
061:             *
062:             *  @return Object[] with the template name stack contents.
063:             */
064:            Object[] getTemplateNameStack();
065:
066:            /**
067:             *  returns an IntrospectionCache Data (@see IntrospectionCacheData)
068:             *  object if exists for the key
069:             *
070:             *  @param key  key to find in cache
071:             *  @return cache object
072:             */
073:            IntrospectionCacheData icacheGet(Object key);
074:
075:            /**
076:             *  places an IntrospectionCache Data (@see IntrospectionCacheData)
077:             *  element in the cache for specified key
078:             *
079:             *  @param key  key
080:             *  @param o  IntrospectionCacheData object to place in cache
081:             */
082:            void icachePut(Object key, IntrospectionCacheData o);
083:
084:            /**
085:             *  temporary fix to enable #include() to figure out
086:             *  current encoding.
087:             *
088:             * @return The current resource.
089:             */
090:            Resource getCurrentResource();
091:
092:            /**
093:             * @param r
094:             */
095:            void setCurrentResource(Resource r);
096:
097:            /**
098:             * Checks to see if rendering should be allowed.  Defaults to true but will
099:             * return false after a #stop directive.
100:             *
101:             * @return true if rendering is allowed, false if no rendering should occur
102:             */
103:            boolean getAllowRendering();
104:
105:            /**
106:             * Set whether rendering is allowed.  Defaults to true but is set to
107:             * false after a #stop directive.
108:             * @param v
109:             */
110:            void setAllowRendering(boolean v);
111:
112:        }
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