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Liferay Portal Template FreeMarker
/*
* 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.
*/
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.
*/
public class JythonModel
implements TemplateBooleanModel, TemplateScalarModel, TemplateHashModel,
TemplateMethodModelEx, AdapterTemplateModel, WrapperTemplateModel {
protected final PyObject object;
protected final JythonWrapper wrapper;
static final ModelFactory FACTORY =
new ModelFactory()
{
@Override
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__()}.
*/
@Override
public boolean getAsBoolean() throws TemplateModelException {
try {
return object.__nonzero__();
} catch (PyException e) {
throw new TemplateModelException(e);
}
}
/**
* Returns the value of {@link Object#toString()}.
*/
@Override
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).
*/
@Override
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
.
*/
@Override
public boolean isEmpty() throws TemplateModelException {
try {
return object.__len__() == 0;
} catch (PyException e) {
throw new TemplateModelException(e);
}
}
/**
* @see freemarker.template.TemplateMethodModel#exec(List)
*/
@Override
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);
}
}
@Override
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;
}
@Override
public Object getWrappedObject() {
return object == null ? null : object.__tojava__(Object.class);
}
}
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