freemarker.ext.beans.MapModel 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.ext.beans;
import java.util.List;
import java.util.Map;
import java.util.Set;
import freemarker.ext.util.ModelFactory;
import freemarker.template.ObjectWrapper;
import freemarker.template.TemplateMethodModelEx;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
/**
* A special case of {@link BeanModel} that adds implementation
* for {@link TemplateMethodModelEx} on map objects that is a shortcut for the
* Map.get() method. Note that if the passed argument itself is a
* reflection-wrapper model, then the map lookup will be performed using the
* wrapped object as the key. Note that you can call get() using the
* map.key syntax inherited from {@link BeanModel} as well,
* however in that case the key is always a string.
* The class itself does not implement the {@link freemarker.template.TemplateCollectionModel}.
* You can, however use map.entrySet(), map.keySet(), or
* map.values() to obtain {@link freemarker.template.TemplateCollectionModel} instances for
* various aspects of the map.
* @author Attila Szegedi
* @version $Id: MapModel.java,v 1.26.2.3 2006/02/26 18:26:37 revusky Exp $
*/
public class MapModel
extends
StringModel
implements
TemplateMethodModelEx
{
static final ModelFactory FACTORY =
new ModelFactory()
{
public TemplateModel create(Object object, ObjectWrapper wrapper)
{
return new MapModel((Map)object, (BeansWrapper)wrapper);
}
};
/**
* Creates a new model that wraps the specified map object.
* @param map the map object to wrap into a model.
* @param wrapper the {@link BeansWrapper} associated with this model.
* Every model has to have an associated {@link BeansWrapper} instance. The
* model gains many attributes from its wrapper, including the caching
* behavior, method exposure level, method-over-item shadowing policy etc.
*/
public MapModel(Map map, BeansWrapper wrapper)
{
super(map, wrapper);
}
/**
* The first argument is used as a key to call the map's get method.
*/
public Object exec(List arguments)
throws
TemplateModelException
{
Object key = unwrap((TemplateModel)arguments.get(0));
return wrap(((Map)object).get(key));
}
/**
* Overridden to invoke the generic get method by casting to Map instead of
* through reflection - should yield better performance.
*/
protected TemplateModel invokeGenericGet(Map keyMap, Class clazz, String key)
throws TemplateModelException
{
Map map = (Map) object;
Object val = map.get(key);
if(val == null) {
if(key.length() == 1) {
// just check for Character key if this is a single-character string
Character charKey = new Character(key.charAt(0));
val = map.get(charKey);
if (val == null && !(map.containsKey(key) || map.containsKey(charKey))) {
return UNKNOWN;
}
}
else if(!map.containsKey(key)) {
return UNKNOWN;
}
}
return wrap(val);
}
public boolean isEmpty()
{
return ((Map)object).isEmpty() && super.isEmpty();
}
public int size()
{
return keySet().size();
}
protected Set keySet()
{
Set set = super.keySet();
set.addAll(((Map)object).keySet());
return set;
}
}