File: cache.py

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"""
Objective-C runtime wrapper for use by LLDB Python formatters

Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
See https://llvm.org/LICENSE.txt for license information.
SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
"""
import lldb.formatters.metrics


class Cache:

    def __init__(self):
        self.data = {}
        self.statistics = lldb.formatters.metrics.Metrics()
        self.statistics.add_metric('hit')
        self.statistics.add_metric('miss')

    def look_for_key(self, key):
        if key in self.data:
            return True
        return False

    def add_item(self, key, value, ok_to_replace=True):
        if not(ok_to_replace) and self.look_for_key(key):
            return False
        self.data[key] = value
        return True

    def get_value(self, key, default=None):
        if self.look_for_key(key):
            self.statistics.metric_hit('hit', key)
            return self.data[key]
        else:
            self.statistics.metric_hit('miss', key)
            return default