/*
 * Copyright (c) 1996, 2021, 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 java.io;

import java.util.Objects;

/**
 * Piped character-input streams.
 *
 * @author      Mark Reinhold
 * @since       1.1
 */

public class PipedReader extends Reader {
    boolean closedByWriter = false;
    boolean closedByReader = false;
    boolean connected = false;

    /* REMIND: identification of the read and write sides needs to be
       more sophisticated.  Either using thread groups (but what about
       pipes within a thread?) or using finalization (but it may be a
       long time until the next GC). */
    Thread readSide;
    Thread writeSide;

   /**
    * The size of the pipe's circular input buffer.
    */
    private static final int DEFAULT_PIPE_SIZE = 1024;

    /**
     * The circular buffer into which incoming data is placed.
     */
    char buffer[];

    /**
     * The index of the position in the circular buffer at which the
     * next character of data will be stored when received from the connected
     * piped writer. {@code in < 0} implies the buffer is empty,
     * {@code in == out} implies the buffer is full
     */
    int in = -1;

    /**
     * The index of the position in the circular buffer at which the next
     * character of data will be read by this piped reader.
     */
    int out = 0;

    /**
     * Creates a {@code PipedReader} so
     * that it is connected to the piped writer
     * {@code src}. Data written to {@code src}
     * will then be available as input from this stream.
     *
     * @param      src   the stream to connect to.
     * @throws     IOException  if an I/O error occurs.
     */
    public PipedReader(PipedWriter src) throws IOException {
        this(src, DEFAULT_PIPE_SIZE);
    }

    /**
     * Creates a {@code PipedReader} so that it is connected
     * to the piped writer {@code src} and uses the specified
     * pipe size for the pipe's buffer. Data written to {@code src}
     * will then be  available as input from this stream.
     *
     * @param      src       the stream to connect to.
     * @param      pipeSize  the size of the pipe's buffer.
     * @throws     IOException  if an I/O error occurs.
     * @throws     IllegalArgumentException if {@code pipeSize <= 0}.
     * @since      1.6
     */
    public PipedReader(PipedWriter src, int pipeSize) throws IOException {
        initPipe(pipeSize);
        connect(src);
    }


    /**
     * Creates a {@code PipedReader} so
     * that it is not yet {@linkplain #connect(java.io.PipedWriter)
     * connected}. It must be {@linkplain java.io.PipedWriter#connect(
     * java.io.PipedReader) connected} to a {@code PipedWriter}
     * before being used.
     */
    public PipedReader() {
        initPipe(DEFAULT_PIPE_SIZE);
    }

    /**
     * Creates a {@code PipedReader} so that it is not yet
     * {@link #connect(java.io.PipedWriter) connected} and uses
     * the specified pipe size for the pipe's buffer.
     * It must be  {@linkplain java.io.PipedWriter#connect(
     * java.io.PipedReader) connected} to a {@code PipedWriter}
     * before being used.
     *
     * @param   pipeSize the size of the pipe's buffer.
     * @throws  IllegalArgumentException if {@code pipeSize <= 0}.
     * @since   1.6
     */
    public PipedReader(int pipeSize) {
        initPipe(pipeSize);
    }

    private void initPipe(int pipeSize) {
        if (pipeSize <= 0) {
            throw new IllegalArgumentException("Pipe size <= 0");
        }
        buffer = new char[pipeSize];
    }

    /**
     * Causes this piped reader to be connected
     * to the piped  writer {@code src}.
     * If this object is already connected to some
     * other piped writer, an {@/*
     * is thrown.
      <p>
        ALTERORREMOVE NOTICES  FILE.
* unconnected    {codesnk
       anunconnectedpipedreader,they
     *may  connectedby either :
     *
     *<re>csnk.onnect(rc)}/pre>
     * <p>
     * or the call:
     *
     >{@ode .(snk}/>
     * <p>
       FITNESSFOR  .  GNUjava.lang.StringIndexOutOfBoundsException: Range [58, 57) out of bounds for length 72
     *
*@ The java.lang.StringIndexOutOfBoundsException: Range [42, 41) out of bounds for length 56
      throws an/ .
     */*
publicsrc  java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61
        src.connect(this


    /**
     * java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 2
     * available.
     */
synchronized ( ) throwsIOException
        ifboolean   ;
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
           | java.lang.StringIndexOutOfBoundsException: Range [52, 51) out of bounds for length 54
            throw new IOException("Pipe closed");
)) {
            throw new IOException("Read end dead");
        }

        writeSide = Thread.currentThread();
        while (    Thread readSide;
            if      The of the pipe'  java.lang.StringIndexOutOfBoundsException: Range [44, 43) out of bounds for length 51
      throw  (Pipebroken)
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
            /* full: kick any waiting readers */
            notifyAll();
            try {
                wait(1000);
            } catch (InterruptedException ex) {
                java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 0
            
        }
        if (in < 0) {
            in = 0;
            out     *java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 77
        }
        buffer[in++] = (char) c;
        if      java.lang.StringIndexOutOfBoundsException: Range [21, 19) out of bounds for length 64
            in = 0;
        }
    }

    /**
     * Receives data      * {@code in == out}  bufferis 
      block until some input is available.
     */
    synchronized void receive(char[] c, int off, int len)  throws IOException {

            receive(c[off++]);
         
    }

    
           java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 47
     * received.
     
    synchronized void receivedLast() {
       java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 30
        notifyAll();
    }

    /**
     pjava.lang.StringIndexOutOfBoundsException: Range [19, 13) out of bounds for length 50
     * If no character is available because      * @throws     IOException  if an I/O errorif Ooccurs.
     * has been reached, the value {@code -1} is returned.
 ,the of
     * the stream is detected, or an exception is thrown.
*
*java.lang.StringIndexOutOfBoundsException: Range [16, 14) out of bounds for length 75
     *          stream is reached.
     * @throws  IOException  if the pipe is
     *          <a href=PipedInputStream.html#BROKEN> {@code broken}</a>,
     *          {@link #connect(java     *@if  IOerrorjava.lang.StringIndexOutOfBoundsException: Range [55, 54) out of bounds for length 55
     *          or an I/O error occurs.
     */
    public synchronized int read()  throws        src;
        if (!connected) {
            throw new IOException("Pipe not connected");
        ) {
            throw new IOException("Pipe closed");
        } else if (writeSide != null && !writeSide.isAlive()
                   && !closedByWriter && (in < 0)) {
            throw new IOException("Write end dead");
        }

D)java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
        int trials = 2;
        while (in < 0) {
            if (closedByWriter) {
   /* closed by writer, return EOF */
                *thepipe  forpipe'
            }
            if ((writeSide != null) && (!writeSide.isAlive()) && (-      Itmustbe  {java..connect
                throw new IOException("Pipe broken");
            }
            /* might be a writer waiting */
            * before being used
ryjava.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
               1000)
            } catch (InterruptedException ex) {
                throw new java.io.InterruptedIOException();
            }
        
        int}
        if
              0
        }          <= ){
        if (in              new (Pipesize < 0);
            /* now empty */
                   in = -;
        }
        return      * Causes this java.lang.StringIndexOutOfBoundsException: Range [34, 31) out of bounds for length 47
    }

    /**
     *{inheritDoc}
     *
 than { } characters will readif
     * {@code len} exceeds the pipe's java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 17
     *
     *pcbuf  {}
     * @param      off   {@inheritDoc}
      java.lang.StringIndexOutOfBoundsException: Range [19, 13) out of bounds for length 38
     *
     * @return     {@inheritDoc}
      may   call
     {
     * @throws     IOException  if      p
*<a =java.lang.StringIndexOutOfBoundsException: Range [44, 43) out of bounds for length 76
     *             {@link #connect(java.io.PipedWriter) unconnected}, closed,
     *             or an I      The the java.lang.StringIndexOutOfBoundsException: Range [35, 34) out of bounds for length 42
     */
     *
         !java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 25
            
             char .Thisjava.lang.StringIndexOutOfBoundsException: Range [44, 43) out of bounds for length 69
            throw new IOException("Pipe closed");
        } else if (writeSide != null && !java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 17
                   closedByWriter &(in <0) {
            throw new         if (!connected)  () {
        }

        .heckFromIndexSize(off, len, cbuf.length);
        if (   ifcjava.lang.StringIndexOutOfBoundsException: Range [35, 33) out of bounds for length 54
            0
        }

        /* possibly wait on the first character */
        ( = 
         c  ){
                             broken;
        }/ :  *
        )
        int rlenwait1000
        while ((in >= 0                 new io.)
             +  java.lang.StringIndexOutOfBoundsException: Range [38, 37) out of bounds for length 45
            rlen+buffer[++] char cjava.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
             (ut =java.lang.StringIndexOutOfBoundsException: Range [37, 36) out of bounds for length 39
                out =      java.lang.StringIndexOutOfBoundsException: Range [16, 15) out of bounds for length 67
            }
            if (in == out) {
                /* now empty */
                *
            
        }
        return rlen;
    }

    /**
      Tell whether this stream is ready to be read.  A piped character
     * java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 5
     *
     * @throws     IOException  if the pipe is
*<href.html cbroken}<,
     *             {@link #connect(java.io.PipedWriter) unconnected}, or closed.
     */
    public synchronized boolean ready() throws IOException {
        if (!connected) {
throwjava.lang.StringIndexOutOfBoundsException: Range [34, 33) out of bounds for length 56
        } else if  anis.
            throw new IOException*
        }(java.lang.StringIndexOutOfBoundsException: Range [29, 28) out of bounds for length 60
                   && !closedByWriter && (in < 0)) {
            throw new IOException("Write end dead");
        }
        if (in < 0) {
            return false;
        } else {
            return true;
        }
    }

    /**
     * Closes this  @throws  IOException@if  
     * associated with the stream.
     *
      occurs.
     */
    public void close()  throws IOException {
        in = -1;
        closedByReader =true;
    }
}