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#!/usr/bin/env python

# Copyright (C) 2010-2012 Google Inc.
#
# Licensed 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.

"""Simple module containing a shared base handler for Jinja2 rendering."""


import webapp2
from webapp2_extras import jinja2


class BaseHandler(webapp2.RequestHandler):
    """Base handler for rendering Jinja2 templates."""

    @webapp2.cached_property
    def jinja2(self):
        """Cached property holding a Jinja2 instance.

Returns:
A Jinja2 object for the current app.
"""
        return jinja2.get_jinja2(app=self.app)

    def render_response(self, template, **context):
        """Use Jinja2 instance to render template and write to output.

Args:
template: filename (relative to $PROJECT/templates) that we are
rendering.
context: keyword arguments corresponding to variables in template.
"""
        rendered_value = self.jinja2.render_template(template, **context)
        self.response.write(rendered_value)
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