freemarker.template.WrappingTemplateModel Maven / Gradle / Ivy
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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.template;
/**
* A base class for containers that wrap arbitrary Java objects into
* {@link TemplateModel} instances.
*
* @version $Id: WrappingTemplateModel.java,v 1.18.2.1 2005/12/07 00:41:23 revusky Exp $
*/
abstract public class WrappingTemplateModel {
private static ObjectWrapper defaultObjectWrapper =
DefaultObjectWrapper.instance;
private ObjectWrapper objectWrapper;
/**
* Sets the default object wrapper that is used when a wrapping template
* model is constructed without being passed an explicit object wrapper.
* The default value is {@link ObjectWrapper#SIMPLE_WRAPPER}.
* Note that {@link Configuration#setSharedVariable(String, Object)} and
* {@link Template#process(Object, java.io.Writer)} don't use this setting,
* they rather use whatever object wrapper their
* {@link Configuration#getObjectWrapper()} method returns.
*/
public static void setDefaultObjectWrapper(ObjectWrapper objectWrapper) {
defaultObjectWrapper = objectWrapper;
}
/**
* Returns the default object wrapper that is used when a wrapping template
* model is constructed without being passed an explicit object wrapper.
* Note that {@link Configuration#setSharedVariable(String, Object)} and
* {@link Template#process(Object, java.io.Writer)} don't use this setting,
* they rather use whatever object wrapper their
* {@link Configuration#getObjectWrapper()} method returns.
*/
public static ObjectWrapper getDefaultObjectWrapper() {
return defaultObjectWrapper;
}
/**
* Protected constructor that creates a new wrapping template model using
* the default object wrapper.
*/
protected WrappingTemplateModel() {
this(defaultObjectWrapper);
}
/**
* Protected constructor that creates a new wrapping template model using
* the specified object wrapper.
* @param objectWrapper the wrapper to use. If null is passed, the default
* object wrapper is used.
*/
protected WrappingTemplateModel(ObjectWrapper objectWrapper) {
this.objectWrapper =
objectWrapper != null ? objectWrapper : defaultObjectWrapper;
if (this.objectWrapper == null) {
this.objectWrapper = defaultObjectWrapper = new DefaultObjectWrapper();
}
}
/**
* Returns the object wrapper instance used by this wrapping template model.
*/
public ObjectWrapper getObjectWrapper() {
return objectWrapper;
}
public void setObjectWrapper(ObjectWrapper objectWrapper) {
this.objectWrapper = objectWrapper;
}
/**
* Wraps the passed object into a template model using this object's object
* wrapper.
* @param obj the object to wrap
* @return the template model that wraps the object
* @throws TemplateModelException if the wrapper does not know how to
* wrap the passed object.
*/
protected final TemplateModel wrap(Object obj) throws TemplateModelException {
return objectWrapper.wrap(obj);
}
}