Package com.ribs.pdf

Class PDFCharStream

  • All Implemented Interfaces:
    CharStream
    public final class PDFCharStream
extends java.lang.Object
implements CharStream
    An implementation of interface CharStream, where the stream can contain any binary data. It holds a buffer to the entire contents and keeps track of the the current position within that buffer.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      int bufpos  
      static boolean staticFlag  

    • Constructor Summary

      Constructors 
      Constructor Description
      PDFCharStream​(byte[] b)  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      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.
      byte[] buffer()  
      int currentLocation()  
      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.
      int getBeginColumn()
      Returns the column number of the first character for current token (being matched after the last call to BeginTOken).
      int getBeginLine()
      Returns the line number of the first character for current token (being matched after the last call to BeginTOken).
      int getColumn()
      Returns the column position of the character last read.
      int getEndColumn()
      Returns the column number of the last character for current token (being matched after the last call to BeginTOken).
      int getEndLine()
      Returns the line number of the last character for current token (being matched after the last call to BeginTOken).
      java.lang.String GetImage()
      Returns a string made up of characters from the marked token beginning to the current buffer position.
      int getLine()
      Returns the line number of the character last read.
      byte[] GetNextBytes​(int n)  
      char[] GetSuffix​(int len)
      Returns an array of characters that make up the suffix of length 'len' for the currently matched token.
      char readChar()
      Returns the next character from the selected input.
      void ReInit​(byte[] newdata, int offset)  
      void ReInit​(int offset)  

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • bufpos

        public int bufpos

    • Constructor Detail

      • PDFCharStream

        public PDFCharStream​(byte[] b)

    • Method Detail

      • readChar

        public final char readChar()
                    throws java.io.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:
        java.io.IOException

      • getEndColumn

        public 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 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 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 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

      • 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

      • BeginToken

        public final char BeginToken()
                      throws java.io.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:
        java.io.IOException

      • GetImage

        public final java.lang.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 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

      • GetNextBytes

        public byte[] GetNextBytes​(int n)
                    throws java.io.IOException
        Throws:
        java.io.IOException

      • 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

      • currentLocation

        public int currentLocation()

      • buffer

        public byte[] buffer()

      • ReInit

        public void ReInit​(int offset)

      • ReInit

        public void ReInit​(byte[] newdata,
                   int offset)