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Kotlin conversion: ProxyOutputStream

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This commit is contained in:
Paul Schaub 2023-10-31 15:07:13 +01:00
parent b7007cc007
commit 05886228df
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
2 changed files with 75 additions and 80 deletions
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80
sop-java/src/main/java/sop/util/ProxyOutputStream.java
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@ -1,80 +0,0 @@
// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package sop.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* {@link OutputStream} that buffers data being written into it, until its underlying output stream is being replaced.
* At that point, first all the buffered data is being written to the underlying stream, followed by any successive
* data that may get written to the {@link ProxyOutputStream}.
* <p>
* This class is useful if we need to provide an {@link OutputStream} at one point in time when the final
* target output stream is not yet known.
*/
public class ProxyOutputStream extends OutputStream {
private final ByteArrayOutputStream buffer;
private OutputStream swapped;
public ProxyOutputStream() {
this.buffer = new ByteArrayOutputStream();
}
public synchronized void replaceOutputStream(OutputStream underlying) throws IOException {
if (underlying == null) {
throw new NullPointerException("Underlying OutputStream cannot be null.");
}
this.swapped = underlying;
byte[] bufferBytes = buffer.toByteArray();
swapped.write(bufferBytes);
}
@Override
public synchronized void write(byte[] b) throws IOException {
if (swapped == null) {
buffer.write(b);
} else {
swapped.write(b);
}
}
@Override
public synchronized void write(byte[] b, int off, int len) throws IOException {
if (swapped == null) {
buffer.write(b, off, len);
} else {
swapped.write(b, off, len);
}
}
@Override
public synchronized void flush() throws IOException {
buffer.flush();
if (swapped != null) {
swapped.flush();
}
}
@Override
public synchronized void close() throws IOException {
buffer.close();
if (swapped != null) {
swapped.close();
}
}
@Override
public synchronized void write(int i) throws IOException {
if (swapped == null) {
buffer.write(i);
} else {
swapped.write(i);
}
}
}

75
sop-java/src/main/kotlin/sop/util/ProxyOutputStream.kt Normal file
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@ -0,0 +1,75 @@
// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
//
// SPDX-License-Identifier: Apache-2.0
package sop.util
import java.io.ByteArrayOutputStream
import java.io.IOException
import java.io.OutputStream
/**
* [OutputStream] that buffers data being written into it, until its underlying output stream is
* being replaced. At that point, first all the buffered data is being written to the underlying
* stream, followed by any successive data that may get written to the [ProxyOutputStream]. This
* class is useful if we need to provide an [OutputStream] at one point in time when the final
* target output stream is not yet known.
*/
class ProxyOutputStream {
private val buffer = ByteArrayOutputStream()
private var swapped: OutputStream? = null
@Synchronized
fun replaceOutputStream(underlying: OutputStream) {
this.swapped = underlying
swapped!!.write(buffer.toByteArray())
}
@Synchronized
@Throws(IOException::class)
fun write(b: ByteArray) {
if (swapped == null) {
buffer.write(b)
} else {
swapped!!.write(b)
}
}
@Synchronized
@Throws(IOException::class)
fun write(b: ByteArray, off: Int, len: Int) {
if (swapped == null) {
buffer.write(b, off, len)
} else {
swapped!!.write(b, off, len)
}
}
@Synchronized
@Throws(IOException::class)
fun flush() {
buffer.flush()
if (swapped != null) {
swapped!!.flush()
}
}
@Synchronized
@Throws(IOException::class)
fun close() {
buffer.close()
if (swapped != null) {
swapped!!.close()
}
}
@Synchronized
@Throws(IOException::class)
fun write(i: Int) {
if (swapped == null) {
buffer.write(i)
} else {
swapped!!.write(i)
}
}
}