mirror of https://github.com/apache/cassandra
68 lines
2.7 KiB
Python
68 lines
2.7 KiB
Python
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import cql
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from marshal import (unmarshallers, unmarshal_noop)
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class SchemaDecoder(object):
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"""
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Decode binary column names/values according to schema.
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"""
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def __init__(self, schema={}):
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self.schema = schema
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def __get_column_family_def(self, keyspace, column_family):
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if self.schema.has_key(keyspace):
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if self.schema[keyspace].has_key(column_family):
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return self.schema[keyspace][column_family]
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return None
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def __comparator_for(self, keyspace, column_family):
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cfam = self.__get_column_family_def(keyspace, column_family)
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if cfam and "comparator" in cfam:
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return cfam["comparator"]
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return None
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def __validator_for(self, keyspace, column_family, name):
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cfam = self.__get_column_family_def(keyspace, column_family)
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if cfam:
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if name in cfam["columns"]:
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return cfam["columns"][name]
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return cfam["default_validation_class"]
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return None
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def __keytype_for(self, keyspace, column_family):
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cfam = self.__get_column_family_def(keyspace, column_family)
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if cfam and "key_validation_class" in cfam:
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return cfam["key_validation_class"]
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return None
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def decode_row(self, keyspace, column_family, row):
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key_type = self.__keytype_for(keyspace, column_family)
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key = unmarshallers.get(key_type, unmarshal_noop)(row.key)
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description = [(cql.ROW_KEY, key_type, None, None, None, None, None, False)]
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comparator = self.__comparator_for(keyspace, column_family)
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unmarshal = unmarshallers.get(comparator, unmarshal_noop)
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values = [key]
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for column in row.columns:
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description.append((unmarshal(column.name), comparator, None, None, None, None, True))
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validator = self.__validator_for(keyspace, column_family, column.name)
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values.append(unmarshallers.get(validator, unmarshal_noop)(column.value))
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return description, values
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