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[jsscripting] openhab-js integration (openhab#11656)
Fixes openhab#11222 Signed-off-by: Dan Cunningham <dan@digitaldan.com> Signed-off-by: Nick Waterton <n.waterton@outlook.com>
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93 changes: 93 additions & 0 deletions
93
...java/org/openhab/automation/jsscripting/internal/fs/ReadOnlySeekableByteArrayChannel.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| /** | ||
| * Copyright (c) 2010-2021 Contributors to the openHAB project | ||
| * | ||
| * See the NOTICE file(s) distributed with this work for additional | ||
| * information. | ||
| * | ||
| * This program and the accompanying materials are made available under the | ||
| * terms of the Eclipse Public License 2.0 which is available at | ||
| * http://www.eclipse.org/legal/epl-2.0 | ||
| * | ||
| * SPDX-License-Identifier: EPL-2.0 | ||
| */ | ||
|
|
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| package org.openhab.automation.jsscripting.internal.fs; | ||
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| import java.io.IOException; | ||
| import java.nio.ByteBuffer; | ||
| import java.nio.channels.ClosedChannelException; | ||
| import java.nio.channels.SeekableByteChannel; | ||
|
|
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| /** | ||
| * Simple wrapper around a byte array to provide a SeekableByteChannel for consumption | ||
| * | ||
| * @author Dan Cunningham - Initial contribution | ||
| */ | ||
| public class ReadOnlySeekableByteArrayChannel implements SeekableByteChannel { | ||
| private byte[] data; | ||
| private int position; | ||
| private boolean closed; | ||
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| public ReadOnlySeekableByteArrayChannel(byte[] data) { | ||
| this.data = data; | ||
| } | ||
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| @Override | ||
| public long position() { | ||
| return position; | ||
| } | ||
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| @Override | ||
| public SeekableByteChannel position(long newPosition) throws IOException { | ||
| ensureOpen(); | ||
| position = (int) Math.max(0, Math.min(newPosition, size())); | ||
| return this; | ||
| } | ||
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| @Override | ||
| public long size() { | ||
| return data.length; | ||
| } | ||
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| @Override | ||
| public int read(ByteBuffer buf) throws IOException { | ||
| ensureOpen(); | ||
| int remaining = (int) size() - position; | ||
| if (remaining <= 0) { | ||
| return -1; | ||
| } | ||
| int readBytes = buf.remaining(); | ||
| if (readBytes > remaining) { | ||
| readBytes = remaining; | ||
| } | ||
| buf.put(data, position, readBytes); | ||
| position += readBytes; | ||
| return readBytes; | ||
| } | ||
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| @Override | ||
| public void close() { | ||
| closed = true; | ||
| } | ||
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| @Override | ||
| public boolean isOpen() { | ||
| return !closed; | ||
| } | ||
|
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| @Override | ||
| public int write(ByteBuffer b) throws IOException { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public SeekableByteChannel truncate(long newSize) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| private void ensureOpen() throws ClosedChannelException { | ||
| if (!isOpen()) { | ||
| throw new ClosedChannelException(); | ||
| } | ||
| } | ||
| } |
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