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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Convert Python function to Java Function","articleBody":"It would be nice to support something like this:\r\n```python\r\n\u003e\u003e\u003e def fib(n):\r\n...     if n == 0 or n == 1:\r\n...         return 1;\r\n...     return fib(n - 1) + fib(n - 2)\r\n...\r\n\u003e\u003e\u003e import scyjava\r\n\u003e\u003e\u003e jfib = scyjava.convert.to_java(fib)\r\n\u003e\u003e\u003e print(type(jfib))\r\n\u003cclass 'scyjava.convert._convert.FunctionFromPython'\u003e\r\n\u003e\u003e\u003e\r\n```\r\n\r\nWhere `FunctionFromPython` is:\r\n```python\r\nfrom jnius import PythonJavaClass, java_method\r\n\r\nclass FunctionFromPython(PythonJavaClass):\r\n    __javainterfaces__ = ['java/util/function/Function']\r\n\r\n    def __init__(self, function):\r\n        self.function = function\r\n\r\n    @java_method('(Ljava/lang/Object;)Ljava/lang/Object;')\r\n    def apply(self, t):\r\n        return self.function(t)\r\n```\r\n\r\nThen anything operating on a Java `Function` can accept a Python `function` with appropriate conversion. For example:\r\n\r\n```python\r\njlist = ij.py.to_java([5, 4, 3, 2, 1])\r\nfibList = jlist.stream().map(jfib).toArray()\r\nprint(f'{type(fibList)}')\r\nprint(fibList)\r\n```\r\nPrints:\r\n```\r\n\u003cclass 'list'\u003e\r\n[8, 5, 3, 2, 1]\r\n```\r\n\r\n😎 ","author":{"url":"https://github.com/ctrueden","@type":"Person","name":"ctrueden"},"datePublished":"2020-06-18T18:10:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/17/scyjava/issues/17"}