76 lines
1.9 KiB
Kotlin
76 lines
1.9 KiB
Kotlin
// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package sop.util
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import java.io.ByteArrayOutputStream
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import java.io.IOException
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import java.io.OutputStream
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/**
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* [OutputStream] that buffers data being written into it, until its underlying output stream is
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* being replaced. At that point, first all the buffered data is being written to the underlying
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* stream, followed by any successive data that may get written to the [ProxyOutputStream]. This
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* class is useful if we need to provide an [OutputStream] at one point in time when the final
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* target output stream is not yet known.
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*/
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class ProxyOutputStream : OutputStream() {
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private val buffer = ByteArrayOutputStream()
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private var swapped: OutputStream? = null
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@Synchronized
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fun replaceOutputStream(underlying: OutputStream) {
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this.swapped = underlying
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swapped!!.write(buffer.toByteArray())
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}
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@Synchronized
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@Throws(IOException::class)
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override fun write(b: ByteArray) {
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if (swapped == null) {
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buffer.write(b)
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} else {
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swapped!!.write(b)
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}
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}
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@Synchronized
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@Throws(IOException::class)
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override fun write(b: ByteArray, off: Int, len: Int) {
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if (swapped == null) {
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buffer.write(b, off, len)
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} else {
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swapped!!.write(b, off, len)
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}
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}
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@Synchronized
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@Throws(IOException::class)
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override fun flush() {
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buffer.flush()
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if (swapped != null) {
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swapped!!.flush()
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}
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}
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@Synchronized
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@Throws(IOException::class)
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override fun close() {
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buffer.close()
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if (swapped != null) {
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swapped!!.close()
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}
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}
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@Synchronized
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@Throws(IOException::class)
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override fun write(i: Int) {
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if (swapped == null) {
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buffer.write(i)
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} else {
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swapped!!.write(i)
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}
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}
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}
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