[8979f90] | 1 | #!/usr/bin/python |
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| 2 | |
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| 3 | import sys, struct, logging |
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| 4 | |
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| 5 | # initialize logger |
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| 6 | logger = logging.getLogger("ippLogger") |
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| 7 | |
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| 8 | class IPPAttributeGroup(): |
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| 9 | """ |
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| 10 | An IPPAttributeGroup consists of an attribute-group-tag, followed |
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| 11 | by a sequence of IPPAttributes. |
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| 12 | """ |
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| 13 | |
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| 14 | def __init__(self, attribute_group_tag, attributes=[]): |
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| 15 | """ |
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| 16 | Initialize an IPPAttributeGroup. |
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| 17 | |
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| 18 | Arguments: |
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| 19 | |
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| 20 | attribute_group_tag -- a signed char, holds the tag of the |
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| 21 | attribute group |
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| 22 | |
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| 23 | attributes -- (optional) a list of attributes |
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| 24 | """ |
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| 25 | |
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| 26 | # make sure attribute_group_tag isn't empty |
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| 27 | assert attribute_group_tag is not None |
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| 28 | |
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| 29 | # make sure attributes is a list or tuple of IPPAttributes |
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| 30 | assert isinstance(attributes, (list, tuple)) |
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| 31 | for a in attributes: assert isinstance(a, IPPAttribute) |
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| 32 | |
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| 33 | self.attribute_group_tag = attribute_group_tag |
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| 34 | self.attributes = attributes |
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| 35 | |
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| 36 | def getAttribute(self, name): |
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| 37 | return filter(lambda x: x.name == name, self.attributes) |
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| 38 | |
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| 39 | def toBinaryData(self): |
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| 40 | """ |
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| 41 | Convert the IPPAttributeGroup to binary. |
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| 42 | """ |
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| 43 | |
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| 44 | # conver the attribute_group_tag to binary |
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| 45 | tag = struct.pack('>b', self.attribute_group_tag) |
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| 46 | |
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| 47 | # convert each of the attributes to binary |
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| 48 | attributes = [a.toBinaryData() for a in self.attributes] |
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| 49 | |
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| 50 | # concatenate everything and return |
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| 51 | return tag + ''.join(attributes) |
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