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# 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.
"""
Constraints for the requirements-and-capabilities matching mechanism.
"""
class NodeTemplateConstraint(object):
"""
Used to constrain requirements for node templates.
Must be serializable.
"""
def matches(self, source_node_template, target_node_template):
"""
Returns ``True`` if the target matches the constraint for the source.
"""
raise NotImplementedError
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