207 lines
6.1 KiB
Python
207 lines
6.1 KiB
Python
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# *****************************************************************************
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# 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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#
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# See NOTICE file for details.
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#
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# *****************************************************************************
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import _jpype
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from . import _jcustomizer
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__all__ = ['JArray']
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class JArray(_jpype._JObject, internal=True): # type: ignore[call-arg]
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""" Creates a Java array class for a Java type of a given dimension.
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This serves as a base type and factory for all Java array classes.
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The resulting Java array class can be used to construct a new
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array with a given size or specified members.
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JPype arrays support Python operators for iterating, length, equals,
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not equals, subscripting, and slicing. They also support Java
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object methods, clone, and length property. Java arrays may not
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be resized, and as such elements cannot be added nor deleted. Currently,
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applying the slice operator produces a new Python sequence.
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Example:
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.. code-block:: python
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# Define a new array class for ``int[]``
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IntArrayCls = JArray(JInt)
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# Create an array holding 10 elements
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# equivalent to Java ``int[] x=new int[10]``
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x = IntArrayCls(10)
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# Create a length 3 array initialized with [1,2,3]
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# equivalent to Java ``int[] x = new int[]{1,2,3};``
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x = IntArrayCls([1,2,3])
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# Operate on an array
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print(len(x))
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print(x[0])
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print(x[:-2])
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x[1:]=(5,6)
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if isinstance(x, JArray):
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print("object is a java array")
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if issubclass(IntArrayCls, JArray):
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print("class is a java array type.")
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Args:
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javaClass (str,type): Is the type of element to hold in
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the array.
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ndims (Optional,int): the number of dimensions of the array
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(default=1)
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Returns:
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A new Python class that representing a Java array class.
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Raises:
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TypeError: if the component class is invalid or could not be found.
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Note:
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javaClass can be specified in three ways:
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- as a string with the name of a java class.
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- as a Java primitive type such as ``jpype.JInt``.
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- as a Java class type such as ``java.lang.String``.
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"""
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def __new__(cls, tp, dims=1):
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if cls != JArray:
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raise TypeError("Arrays factory can't be used as type")
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jc = _toJavaClass(tp)
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return _jpype._newArrayType(jc, dims)
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@classmethod
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def of(cls, array, dtype=None):
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return _jpype.arrayFromBuffer(array, dtype)
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class _JArrayProto(object):
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def __str__(self):
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return str(list(self))
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def __iter__(self):
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return _JavaArrayIter(self)
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def __reversed__(self):
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for elem in self[::-1]:
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yield elem
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def clone(self):
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""" Clone the Java array.
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Create a "shallow" copy of a Java array. For a
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single dimensional array of primitives, the cloned array is
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complete independent copy of the original. For objects or
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multidimensional arrays, the new array is a copy which points
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to the same members as the original.
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To obtain a deep copy of a Java array, use Java serialize and
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deserialize operations to duplicate the entire array and
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contents. In order to deep copy, the objects must be
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Serializable.
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Returns:
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A shallow copy of the array.
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"""
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return _jpype.JClass("java.util.Arrays").copyOf(self, len(self))
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def _toJavaClass(tp):
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"""(internal) Converts a class type in python into a internal java class.
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Used mainly to support JArray.
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The type argument will operate on:
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- (str) lookup by class name or fail if not found.
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- (JClass) just returns the java type.
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- (type) uses a lookup table to find the class.
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"""
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# if it a string than we lookup the class by name.
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if isinstance(tp, str):
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return _jpype._java_lang_Class.forName(tp)
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# if is a java.lang.Class instance, then no coversion required
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if isinstance(tp, _jpype._JClass):
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return tp
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# Okay then it must be a type
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try:
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return _jpype._type_classes[tp].class_
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except KeyError:
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pass
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# See if it a class type
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try:
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return tp.class_
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except AttributeError:
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pass
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raise TypeError("Unable to find class for '%s'" % tp.__name__)
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# FIXME are these not sequences? They act like sequences but are they
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# connected to collections.abc.Sequence
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# has: __len__, __iter__, __getitem__
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# missing: __contains__ (required for in)
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# Cannot be Mutable because java arrays are fixed in length
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class _JavaArrayIter(object):
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def __init__(self, a):
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self._array = a
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self._ndx = -1
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def __iter__(self):
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return self
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def __next__(self):
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self._ndx += 1
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if self._ndx >= len(self._array):
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raise StopIteration
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return self._array[self._ndx]
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next = __next__
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# **********************************************************
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# Char array customizer
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@_jcustomizer.JImplementationFor("byte[]")
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@_jcustomizer.JImplementationFor("char[]")
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class _JCharArray(object):
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def __str__(self):
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return str(_jpype.JString(self))
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def __eq__(self, other):
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if isinstance(other, str):
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return str(self) == other
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try:
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return self.equals(self.__class__(other))
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except TypeError:
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return False
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__hash__ = _jpype._JObject.__hash__
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# Install module hooks
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_jcustomizer._applyCustomizerPost(_jpype._JArray, _JArrayProto)
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_jpype.JArray = JArray
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