freemarker.ext.jython.JythonModel 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.jython;
import java.util.Iterator;
import java.util.List;
import org.python.core.Py;
import org.python.core.PyException;
import org.python.core.PyObject;
import freemarker.ext.util.ModelFactory;
import freemarker.ext.util.WrapperTemplateModel;
import freemarker.template.AdapterTemplateModel;
import freemarker.template.ObjectWrapper;
import freemarker.template.TemplateBooleanModel;
import freemarker.template.TemplateHashModel;
import freemarker.template.TemplateMethodModelEx;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateScalarModel;
/**
* Generic model for arbitrary Jython objects.
* @version $Id: JythonModel.java,v 1.14 2005/06/12 19:03:06 szegedia Exp $
* @author Attila Szegedi
*/
public class JythonModel
implements TemplateBooleanModel, TemplateScalarModel, TemplateHashModel,
TemplateMethodModelEx, AdapterTemplateModel, WrapperTemplateModel
{
protected final PyObject object;
protected final JythonWrapper wrapper;
static final ModelFactory FACTORY =
new ModelFactory()
{
public TemplateModel create(Object object, ObjectWrapper wrapper)
{
return new JythonModel((PyObject)object, (JythonWrapper)wrapper);
}
};
public JythonModel(PyObject object, JythonWrapper wrapper)
{
this.object = object;
this.wrapper = wrapper;
}
/**
* Returns the value of {@link PyObject#__nonzero__()}.
*/
public boolean getAsBoolean() throws TemplateModelException
{
try
{
return object.__nonzero__();
}
catch(PyException e)
{
throw new TemplateModelException(e);
}
}
/**
* Returns the value of {@link Object#toString()}.
*/
public String getAsString() throws TemplateModelException
{
try
{
return object.toString();
}
catch(PyException e)
{
throw new TemplateModelException(e);
}
}
/**
* Calls {@link PyObject#__findattr__(java.lang.String)}, then if it
* returns null calls {@link PyObject#__finditem__(java.lang.String)}.
* If {@link JythonWrapper#setAttributesShadowItems(boolean)} was called
* with false, the order of calls is reversed (that is, item
* lookup takes precedence over attribute lookup).
*/
public TemplateModel get(String key)
throws
TemplateModelException
{
if(key != null)
{
key = key.intern();
}
PyObject obj = null;
try
{
if(wrapper.isAttributesShadowItems())
{
obj = object.__findattr__(key);
if(obj == null)
{
obj = object.__finditem__(key);
}
}
else
{
obj = object.__finditem__(key);
if(obj == null)
{
obj = object.__findattr__(key);
}
}
}
catch(PyException e)
{
throw new TemplateModelException(e);
}
return wrapper.wrap(obj);
}
/**
* Returns {@link PyObject#__len__()} == 0.
*/
public boolean isEmpty() throws TemplateModelException
{
try
{
return object.__len__() == 0;
}
catch(PyException e)
{
throw new TemplateModelException(e);
}
}
/**
* @see freemarker.template.TemplateMethodModel#exec(List)
*/
public Object exec(List arguments) throws TemplateModelException
{
int size = arguments.size();
try
{
switch(size)
{
case 0:
{
return wrapper.wrap(object.__call__());
}
case 1:
{
return wrapper.wrap(object.__call__(wrapper.unwrap(
(TemplateModel)arguments.get(0))));
}
default:
{
PyObject[] pyargs = new PyObject[size];
int i = 0;
for (Iterator arg = arguments.iterator(); arg.hasNext();)
{
pyargs[i++] = wrapper.unwrap(
(TemplateModel) arg.next());
}
return wrapper.wrap(object.__call__(pyargs));
}
}
}
catch(PyException e)
{
throw new TemplateModelException(e);
}
}
public Object getAdaptedObject(Class hint) {
if(object == null) {
return null;
}
Object view = object.__tojava__(hint);
if(view == Py.NoConversion) {
view = object.__tojava__(Object.class);
}
return view;
}
public Object getWrappedObject() {
return object == null ? null : object.__tojava__(Object.class);
}
}