#
# 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.
#

"""
A simple python representation for AMQP content.
"""


def default(val, defval):
    if val is None:
        return defval
    else:
        return val


class Content(object):

    def __init__(self, body="", children=None, properties=None):
        self.body = body
        self.children = default(children, [])
        self.properties = default(properties, {})

    def size(self):
        return len(self.body)

    def weight(self):
        return len(self.children)

    def __getitem__(self, name):
        return self.properties[name]

    def __setitem__(self, name, value):
        self.properties[name] = value

    def __delitem__(self, name):
        del self.properties[name]

    def __repr__(self):
        return '<%s instance: body=%r, children=%r, properties=%r>' % (
            self.__class__.__name__, self.body, self.children, self.properties)
