| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.jshell.execution; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| /** |
| * |
| * @author Jan Lahoda |
| */ |
| class PipeInputStream extends InputStream { |
| |
| private static final int INITIAL_SIZE = 128; |
| private int[] buffer = new int[INITIAL_SIZE]; |
| private int start; |
| private int end; |
| private boolean closed; |
| |
| @Override |
| public synchronized int read() throws IOException { |
| if (start == end && !closed) { |
| inputNeeded(); |
| } |
| while (start == end) { |
| if (closed) { |
| return -1; |
| } |
| try { |
| wait(); |
| } catch (InterruptedException ex) { |
| //ignore |
| } |
| } |
| try { |
| return buffer[start]; |
| } finally { |
| start = (start + 1) % buffer.length; |
| } |
| } |
| |
| @Override |
| public synchronized int read(byte[] b, int off, int len) throws IOException { |
| if (b == null) { |
| throw new NullPointerException(); |
| } else if (off < 0 || len < 0 || len > b.length - off) { |
| throw new IndexOutOfBoundsException(); |
| } else if (len == 0) { |
| return 0; |
| } |
| |
| int c = read(); |
| if (c == -1) { |
| return -1; |
| } |
| b[off] = (byte)c; |
| |
| int totalRead = 1; |
| while (totalRead < len && start != end) { |
| int r = read(); |
| if (r == (-1)) |
| break; |
| b[off + totalRead++] = (byte) r; |
| } |
| return totalRead; |
| } |
| |
| protected void inputNeeded() throws IOException {} |
| |
| private synchronized void write(int b) { |
| if (closed) { |
| throw new IllegalStateException("Already closed."); |
| } |
| int newEnd = (end + 1) % buffer.length; |
| if (newEnd == start) { |
| //overflow: |
| int[] newBuffer = new int[buffer.length * 2]; |
| int rightPart = (end > start ? end : buffer.length) - start; |
| int leftPart = end > start ? 0 : start - 1; |
| System.arraycopy(buffer, start, newBuffer, 0, rightPart); |
| System.arraycopy(buffer, 0, newBuffer, rightPart, leftPart); |
| buffer = newBuffer; |
| start = 0; |
| end = rightPart + leftPart; |
| newEnd = end + 1; |
| } |
| buffer[end] = b; |
| end = newEnd; |
| notifyAll(); |
| } |
| |
| @Override |
| public synchronized void close() { |
| closed = true; |
| notifyAll(); |
| } |
| |
| public OutputStream createOutput() { |
| return new OutputStream() { |
| @Override public void write(int b) throws IOException { |
| PipeInputStream.this.write(b); |
| } |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| for (int i = 0 ; i < len ; i++) { |
| write(Byte.toUnsignedInt(b[off + i])); |
| } |
| } |
| @Override |
| public void close() throws IOException { |
| PipeInputStream.this.close(); |
| } |
| }; |
| } |
| |
| } |