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ASCII_CharStream.javaAPI DocGlassfish v2 API11381Sat May 05 19:17:16 BST 2007org.apache.taglibs.standard.extra.spath

ASCII_CharStream

public final class ASCII_CharStream extends Object
An implementation of interface CharStream, where the stream is assumed to contain only ASCII characters (without unicode processing).

Fields Summary
public static final boolean
staticFlag
int
bufsize
int
available
int
tokenBegin
public int
bufpos
private int[]
bufline
private int[]
bufcolumn
private int
column
private int
line
private boolean
prevCharIsCR
private boolean
prevCharIsLF
private Reader
inputStream
private char[]
buffer
private int
maxNextCharInd
private int
inBuf
Constructors Summary
public ASCII_CharStream(Reader dstream, int startline, int startcolumn, int buffersize)

    inputStream = dstream;
    line = startline;
    column = startcolumn - 1;

    available = bufsize = buffersize;
    buffer = new char[buffersize];
    bufline = new int[buffersize];
    bufcolumn = new int[buffersize];
public ASCII_CharStream(Reader dstream, int startline, int startcolumn)

     this(dstream, startline, startcolumn, 4096);
public ASCII_CharStream(InputStream dstream, int startline, int startcolumn, int buffersize)

     this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
public ASCII_CharStream(InputStream dstream, int startline, int startcolumn)

     this(dstream, startline, startcolumn, 4096);
Methods Summary
public final charBeginToken()

     tokenBegin = -1;
     char c = readChar();
     tokenBegin = bufpos;

     return c;
public voidDone()

     buffer = null;
     bufline = null;
     bufcolumn = null;
private final voidExpandBuff(boolean wrapAround)


      
  
     char[] newbuffer = new char[bufsize + 2048];
     int newbufline[] = new int[bufsize + 2048];
     int newbufcolumn[] = new int[bufsize + 2048];

     try
     {
        if (wrapAround)
        {
           System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
           System.arraycopy(buffer, 0, newbuffer,
                                             bufsize - tokenBegin, bufpos);
           buffer = newbuffer;

           System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
           System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);
           bufline = newbufline;

           System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
           System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);
           bufcolumn = newbufcolumn;

           maxNextCharInd = (bufpos += (bufsize - tokenBegin));
        }
        else
        {
           System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
           buffer = newbuffer;

           System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
           bufline = newbufline;

           System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
           bufcolumn = newbufcolumn;

           maxNextCharInd = (bufpos -= tokenBegin);
        }
     }
     catch (Throwable t)
     {
        throw new Error(t.getMessage());
     }


     bufsize += 2048;
     available = bufsize;
     tokenBegin = 0;
private final voidFillBuff()

     if (maxNextCharInd == available)
     {
        if (available == bufsize)
        {
           if (tokenBegin > 2048)
           {
              bufpos = maxNextCharInd = 0;
              available = tokenBegin;
           }
           else if (tokenBegin < 0)
              bufpos = maxNextCharInd = 0;
           else
              ExpandBuff(false);
        }
        else if (available > tokenBegin)
           available = bufsize;
        else if ((tokenBegin - available) < 2048)
           ExpandBuff(true);
        else
           available = tokenBegin;
     }

     int i;
     try {
        if ((i = inputStream.read(buffer, maxNextCharInd,
                                    available - maxNextCharInd)) == -1)
        {
           inputStream.close();
           throw new java.io.IOException();
        }
        else
           maxNextCharInd += i;
        return;
     }
     catch(java.io.IOException e) {
        --bufpos;
        backup(0);
        if (tokenBegin == -1)
           tokenBegin = bufpos;
        throw e;
     }
public final java.lang.StringGetImage()

     if (bufpos >= tokenBegin)
        return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
     else
        return new String(buffer, tokenBegin, bufsize - tokenBegin) +
                              new String(buffer, 0, bufpos + 1);
public final char[]GetSuffix(int len)

     char[] ret = new char[len];

     if ((bufpos + 1) >= len)
        System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
     else
     {
        System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0,
                                                          len - bufpos - 1);
        System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1);
     }

     return ret;
public voidReInit(java.io.Reader dstream, int startline, int startcolumn, int buffersize)

    inputStream = dstream;
    line = startline;
    column = startcolumn - 1;

    if (buffer == null || buffersize != buffer.length)
    {
      available = bufsize = buffersize;
      buffer = new char[buffersize];
      bufline = new int[buffersize];
      bufcolumn = new int[buffersize];
    }
    prevCharIsLF = prevCharIsCR = false;
    tokenBegin = inBuf = maxNextCharInd = 0;
    bufpos = -1;
public voidReInit(java.io.Reader dstream, int startline, int startcolumn)

     ReInit(dstream, startline, startcolumn, 4096);
public voidReInit(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)

     ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
public voidReInit(java.io.InputStream dstream, int startline, int startcolumn)

     ReInit(dstream, startline, startcolumn, 4096);
private final voidUpdateLineColumn(char c)

     column++;

     if (prevCharIsLF)
     {
        prevCharIsLF = false;
        line += (column = 1);
     }
     else if (prevCharIsCR)
     {
        prevCharIsCR = false;
        if (c == '\n")
        {
           prevCharIsLF = true;
        }
        else
           line += (column = 1);
     }

     switch (c)
     {
        case '\r" :
           prevCharIsCR = true;
           break;
        case '\n" :
           prevCharIsLF = true;
           break;
        case '\t" :
           column--;
           column += (8 - (column & 07));
           break;
        default :
           break;
     }

     bufline[bufpos] = line;
     bufcolumn[bufpos] = column;
public voidadjustBeginLineColumn(int newLine, int newCol)
Method to adjust line and column numbers for the start of a token.

     int start = tokenBegin;
     int len;

     if (bufpos >= tokenBegin)
     {
        len = bufpos - tokenBegin + inBuf + 1;
     }
     else
     {
        len = bufsize - tokenBegin + bufpos + 1 + inBuf;
     }

     int i = 0, j = 0, k = 0;
     int nextColDiff = 0, columnDiff = 0;

     while (i < len &&
            bufline[j = start % bufsize] == bufline[k = ++start % bufsize])
     {
        bufline[j] = newLine;
        nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
        bufcolumn[j] = newCol + columnDiff;
        columnDiff = nextColDiff;
        i++;
     } 

     if (i < len)
     {
        bufline[j] = newLine++;
        bufcolumn[j] = newCol + columnDiff;

        while (i++ < len)
        {
           if (bufline[j = start % bufsize] != bufline[++start % bufsize])
              bufline[j] = newLine++;
           else
              bufline[j] = newLine;
        }
     }

     line = bufline[j];
     column = bufcolumn[j];
public final voidbackup(int amount)


    inBuf += amount;
    if ((bufpos -= amount) < 0)
       bufpos += bufsize;
public final intgetBeginColumn()

     return bufcolumn[tokenBegin];
public final intgetBeginLine()

     return bufline[tokenBegin];
public final intgetColumn()

deprecated
see
#getEndColumn

     return bufcolumn[bufpos];
public final intgetEndColumn()

     return bufcolumn[bufpos];
public final intgetEndLine()

     return bufline[bufpos];
public final intgetLine()

deprecated
see
#getEndLine

     return bufline[bufpos];
public final charreadChar()

     if (inBuf > 0)
     {
        --inBuf;
        return (char)((char)0xff & buffer[(bufpos == bufsize - 1) ? (bufpos = 0) : ++bufpos]);
     }

     if (++bufpos >= maxNextCharInd)
        FillBuff();

     char c = (char)((char)0xff & buffer[bufpos]);

     UpdateLineColumn(c);
     return (c);