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JavaObjectHolder.swift
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JavaObjectHolder.swift
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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2024 Apple Inc. and the Swift.org project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import JavaRuntime
/// Stores a reference to a Java object, managing it as a global reference so
/// that the Java virtual machine will not move or deallocate the object
/// while this instance is live.
public class JavaObjectHolder {
public private(set) var object: jobject?
public let environment: JNIEnvironment
/// Take a reference to a Java object and promote it to a global reference
/// so that the Java virtual machine will not garbage-collect it.
public init(object: jobject, environment: JNIEnvironment) {
self.object = environment.interface.NewGlobalRef(environment, object)
self.environment = environment
}
/// Forget this Java object, meaning that it is no longer used from anywhere
/// in Swift and the Java virtual machine is free to move or deallocate it.
func forget() {
if let object {
environment.interface.DeleteGlobalRef(environment, object)
self.object = nil
}
}
deinit {
self.forget()
}
}