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/*******************************************************************************
* Copyright (c) 2010, 2017 SAP AG and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Lazar Kirchev, SAP AG - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.console.common;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
/**
* This class serves as an input stream, which wraps the actual input (e.g. from the telnet) and buffers the lines.
*/
public class ConsoleInputStream extends InputStream {
private final ArrayList<byte[]> buffer = new ArrayList<>();
private byte[] current;
private int pos;
private boolean isClosed;
@Override
public synchronized int read() {
while (current == null && buffer.isEmpty() && !isClosed) {
try {
wait();
} catch (InterruptedException e) {
return -1;
}
}
if (isClosed) {
return -1;
}
try {
if (current == null) {
current = buffer.remove(0);
return current[pos++] & 0xFF;
} else {
return current[pos++] & 0xFF;
}
} finally {
if (current != null) {
if (pos == current.length) {
current = null;
pos = 0;
}
}
}
}
/*public int read(byte b[], int off, int len) throws IOException {
if (len == 0) {
return len;
}
int i = read();
if (i == -1) {
return -1;
}
b[off] = (byte) i;
return 1;
}*/
/*public synchronized int read(byte b[], int off, int len) throws IOException {
if (len == 0) {
return len;
}
int currOff = off;
int readCnt = 0;
if (current != null) {
int i;
while (pos > 0 && readCnt < len) {
i = read();
if (i == -1) {
return (readCnt > 0) ? readCnt : i;
}
b[currOff] = (byte) i;
currOff++;
readCnt++;
}
} else {
int i = read();
if (i == -1) {
return i;
}
b[currOff] = (byte) i;
currOff++;
readCnt++;
while (pos > 0 && readCnt < len) {
i = read();
if (i == -1) {
return (readCnt > 0) ? readCnt : i;
}
b[currOff] = (byte) i;
currOff++;
readCnt++;
}
}
return readCnt;
}*/
@Override
public synchronized int read(byte b[], int off, int len) throws IOException {
if (len == 0) {
return len;
}
int currOff = off;
int readCnt = 0;
int i;
if (current == null) {
i = read();
if (i == -1) {
return i;
}
b[currOff] = (byte) i;
currOff++;
readCnt++;
}
while ((pos > 0 || !buffer.isEmpty()) && readCnt < len) {
i = read();
if (i == -1) {
return (readCnt > 0) ? readCnt : i;
}
b[currOff] = (byte) i;
currOff++;
readCnt++;
}
return readCnt;
}
@Override
public synchronized void close() throws IOException {
isClosed = true;
notifyAll();
}
public synchronized void add(byte[] data) {
if (data.length > 0) {
buffer.add(data);
notify();
}
}
}
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