mirror of
https://github.com/google/earthengine-api.git
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95 lines
3.0 KiB
Python
95 lines
3.0 KiB
Python
#!/usr/bin/env python
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"""Base class for Image, Feature and Collection.
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This class is never intended to be instantiated by the user.
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"""
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# Using lowercase function naming to match the JavaScript names.
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# pylint: disable=g-bad-name
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from . import apifunction
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from . import computedobject
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from . import ee_exception
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class Element(computedobject.ComputedObject):
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"""Base class for ImageCollection and FeatureCollection."""
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_initialized = False
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def __init__(self, func, args, opt_varName=None):
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"""Constructs a collection by initializing its ComputedObject."""
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super(Element, self).__init__(func, args, opt_varName)
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@classmethod
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def initialize(cls):
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"""Imports API functions to this class."""
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if not cls._initialized:
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apifunction.ApiFunction.importApi(cls, 'Element', 'Element')
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cls._initialized = True
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@classmethod
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def reset(cls):
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"""Removes imported API functions from this class."""
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apifunction.ApiFunction.clearApi(cls)
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cls._initialized = False
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@staticmethod
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def name():
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return 'Element'
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def set(self, *args):
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"""Overrides one or more metadata properties of an Element.
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Args:
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*args: Either a dictionary of properties, or a vararg sequence of
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properties, e.g. key1, value1, key2, value2, ...
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Returns:
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The element with the specified properties overridden.
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"""
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if len(args) == 1:
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properties = args[0]
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# If this is a keyword call, unwrap it.
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if (isinstance(properties, dict) and
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(len(properties) == 1 and 'properties' in properties) and
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isinstance(properties['properties'],
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(dict, computedobject.ComputedObject))):
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# Looks like a call with keyword parameters. Extract them.
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properties = properties['properties']
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if isinstance(properties, dict):
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# Still a plain object. Extract its keys. Setting the keys separately
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# allows filter propagation.
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result = self
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for key, value in properties.items():
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result = apifunction.ApiFunction.call_(
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'Element.set', result, key, value)
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elif (isinstance(properties, computedobject.ComputedObject) and
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apifunction.ApiFunction.lookupInternal('Element.setMulti')):
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# A computed dictionary. Can't set each key separately.
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result = apifunction.ApiFunction.call_(
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'Element.setMulti', self, properties)
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else:
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raise ee_exception.EEException(
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'When Element.set() is passed one argument, '
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'it must be a dictionary.')
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else:
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# Interpret as key1, value1, key2, value2, ...
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if len(args) % 2 != 0:
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raise ee_exception.EEException(
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'When Element.set() is passed multiple arguments, there '
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'must be an even number of them.')
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result = self
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for i in range(0, len(args), 2):
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key = args[i]
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value = args[i + 1]
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result = apifunction.ApiFunction.call_(
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'Element.set', result, key, value)
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# Manually cast the result to an image.
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return self._cast(result)
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