Class UCode_CharStream

java.lang.Object
org.apache.derby.impl.sql.compile.UCode_CharStream
All Implemented Interfaces:
CharStream
public final class UCode_CharStream extends Object implements CharStream
An implementation of interface CharStream, where the stream is assumed to contain only Unicode characters.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    (package private) int
    available
     
    private int[]
    bufcolumn
     
    private char[]
    buffer
     
    private int[]
    bufline
     
    int
    bufpos
     
    (package private) int
    bufsize
     
    (package private) int
    charCnt
     
    (package private) int[]
    charOffset
     
    private int
    column
     
    private int
    inBuf
     
    private Reader
    inputStream
     
    private int
    line
     
    private int
    maxNextCharInd
     
    private char[]
    nextCharBuf
     
    private int
    nextCharInd
     
    private boolean
    prevCharIsCR
     
    private boolean
    prevCharIsLF
     
    static final boolean
    staticFlag
     
    (package private) int
    tokenBegin
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    UCode_CharStream(InputStream dstream, int startline, int startcolumn)
     
    UCode_CharStream(InputStream dstream, int startline, int startcolumn, int buffersize)
     
    UCode_CharStream(Reader dstream, int startline, int startcolumn)
     
    UCode_CharStream(Reader dstream, int startline, int startcolumn, int buffersize)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    adjustBeginLineColumn(int newLine, int newCol)
    Method to adjust line and column numbers for the start of a token.
    final void
    backup(int amount)
    Backs up the input stream by amount steps.
    char
    BeginToken()
    Returns the next character that marks the beginning of the next token.
    void
    Done()
    The lexer calls this function to indicate that it is done with the stream and hence implementations can free any resources held by this class.
    private void
    ExpandBuff(boolean wrapAround)
     
    private void
    FillBuff()
     
    final int
    getBeginColumn()
    Returns the column number of the first character for current token (being matched after the last call to BeginTOken).
    final int
    getBeginLine()
    Returns the line number of the first character for current token (being matched after the last call to BeginTOken).
    final int
    getBeginOffset()
     
    final int
    getColumn()
    Deprecated. 
    final int
    getEndColumn()
    Returns the column number of the last character for current token (being matched after the last call to BeginTOken).
    final int
    getEndLine()
    Returns the line number of the last character for current token (being matched after the last call to BeginTOken).
    final int
    getEndOffset()
     
    final String
    GetImage()
    Returns a string made up of characters from the marked token beginning to the current buffer position.
    final int
    getLine()
    Deprecated. 
    final char[]
    GetSuffix(int len)
    Returns an array of characters that make up the suffix of length 'len' for the currently matched token.
    final char
    readChar()
    Returns the next character from the selected input.
    private char
    ReadChar()
     
    void
    ReInit(InputStream dstream, int startline, int startcolumn)
     
    void
    ReInit(InputStream dstream, int startline, int startcolumn, int buffersize)
     
    void
    ReInit(Reader dstream, int startline, int startcolumn)
     
    void
    ReInit(Reader dstream, int startline, int startcolumn, int buffersize)
     
    private void
    UpdateLineColumn(char c)
     

    Methods inherited from class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • charCnt

      int charCnt

    • charOffset

      int[] charOffset

    • staticFlag

      public static final boolean staticFlag
      See Also:

    • bufpos

      public int bufpos

    • bufsize

      int bufsize

    • available

      int available

    • tokenBegin

      int tokenBegin

    • bufline

      private int[] bufline

    • bufcolumn

      private int[] bufcolumn

    • column

      private int column

    • line

      private int line

    • prevCharIsCR

      private boolean prevCharIsCR

    • prevCharIsLF

      private boolean prevCharIsLF

    • inputStream

      private Reader inputStream

    • nextCharBuf

      private char[] nextCharBuf

    • buffer

      private char[] buffer

    • maxNextCharInd

      private int maxNextCharInd

    • nextCharInd

      private int nextCharInd

    • inBuf

      private int inBuf

  • Constructor Details

    • UCode_CharStream

      public UCode_CharStream(Reader dstream, int startline, int startcolumn, int buffersize)

    • UCode_CharStream

      public UCode_CharStream(Reader dstream, int startline, int startcolumn)

    • UCode_CharStream

      public UCode_CharStream(InputStream dstream, int startline, int startcolumn, int buffersize)

    • UCode_CharStream

      public UCode_CharStream(InputStream dstream, int startline, int startcolumn)

  • Method Details

    • ExpandBuff

      private void ExpandBuff(boolean wrapAround)

    • FillBuff

      private void FillBuff() throws IOException
      Throws:
      IOException

    • ReadChar

      private char ReadChar() throws IOException
      Throws:
      IOException

    • BeginToken

      public char BeginToken() throws IOException
      Description copied from interface: CharStream
      Returns the next character that marks the beginning of the next token. All characters must remain in the buffer between two successive calls to this method to implement backup correctly.
      Specified by:
      BeginToken in interface CharStream
      Throws:
      IOException

    • UpdateLineColumn

      private void UpdateLineColumn(char c)

    • readChar

      public final char readChar() throws IOException
      Description copied from interface: CharStream
      Returns the next character from the selected input. The method of selecting the input is the responsibility of the class implementing this interface. Can throw any java.io.IOException.
      Specified by:
      readChar in interface CharStream
      Throws:
      IOException

    • getColumn

      @Deprecated public final int getColumn()
      Deprecated.
      Description copied from interface: CharStream
      Returns the column position of the character last read.
      Specified by:
      getColumn in interface CharStream
      See Also:

    • getLine

      @Deprecated public final int getLine()
      Deprecated.
      Description copied from interface: CharStream
      Returns the line number of the character last read.
      Specified by:
      getLine in interface CharStream
      See Also:

    • getEndColumn

      public final int getEndColumn()
      Description copied from interface: CharStream
      Returns the column number of the last character for current token (being matched after the last call to BeginTOken).
      Specified by:
      getEndColumn in interface CharStream

    • getEndLine

      public final int getEndLine()
      Description copied from interface: CharStream
      Returns the line number of the last character for current token (being matched after the last call to BeginTOken).
      Specified by:
      getEndLine in interface CharStream

    • getBeginColumn

      public final int getBeginColumn()
      Description copied from interface: CharStream
      Returns the column number of the first character for current token (being matched after the last call to BeginTOken).
      Specified by:
      getBeginColumn in interface CharStream

    • getBeginLine

      public final int getBeginLine()
      Description copied from interface: CharStream
      Returns the line number of the first character for current token (being matched after the last call to BeginTOken).
      Specified by:
      getBeginLine in interface CharStream

    • getBeginOffset

      public final int getBeginOffset()
      Specified by:
      getBeginOffset in interface CharStream

    • getEndOffset

      public final int getEndOffset()
      Specified by:
      getEndOffset in interface CharStream

    • backup

      public final void backup(int amount)
      Description copied from interface: CharStream
      Backs up the input stream by amount steps. Lexer calls this method if it had already read some characters, but could not use them to match a (longer) token. So, they will be used again as the prefix of the next token and it is the implemetation's responsibility to do this right.
      Specified by:
      backup in interface CharStream

    • ReInit

      public void ReInit(Reader dstream, int startline, int startcolumn, int buffersize)
      Specified by:
      ReInit in interface CharStream

    • ReInit

      public void ReInit(Reader dstream, int startline, int startcolumn)
      Specified by:
      ReInit in interface CharStream

    • ReInit

      public void ReInit(InputStream dstream, int startline, int startcolumn, int buffersize)
      Specified by:
      ReInit in interface CharStream

    • ReInit

      public void ReInit(InputStream dstream, int startline, int startcolumn)
      Specified by:
      ReInit in interface CharStream

    • GetImage

      public final String GetImage()
      Description copied from interface: CharStream
      Returns a string made up of characters from the marked token beginning to the current buffer position. Implementations have the choice of returning anything that they want to. For example, for efficiency, one might decide to just return null, which is a valid implementation.
      Specified by:
      GetImage in interface CharStream

    • GetSuffix

      public final char[] GetSuffix(int len)
      Description copied from interface: CharStream
      Returns an array of characters that make up the suffix of length 'len' for the currently matched token. This is used to build up the matched string for use in actions in the case of MORE. A simple and inefficient implementation of this is as follows : { String t = GetImage(); return t.substring(t.length() - len, t.length()).toCharArray(); }
      Specified by:
      GetSuffix in interface CharStream

    • Done

      public void Done()
      Description copied from interface: CharStream
      The lexer calls this function to indicate that it is done with the stream and hence implementations can free any resources held by this class. Again, the body of this function can be just empty and it will not affect the lexer's operation.
      Specified by:
      Done in interface CharStream

    • adjustBeginLineColumn

      public void adjustBeginLineColumn(int newLine, int newCol)
      Method to adjust line and column numbers for the start of a token.