Class UCode_CharStream
- java.lang.Object
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- org.apache.derby.impl.sql.compile.UCode_CharStream
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- All Implemented Interfaces:
CharStream
public final class UCode_CharStream extends java.lang.Object implements CharStream
An implementation of interface CharStream, where the stream is assumed to contain only Unicode characters.
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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 java.io.Reader
inputStream
private int
line
private int
maxNextCharInd
private char[]
nextCharBuf
private int
nextCharInd
private boolean
prevCharIsCR
private boolean
prevCharIsLF
static boolean
staticFlag
(package private) int
tokenBegin
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Constructor Summary
Constructors Constructor Description UCode_CharStream(java.io.InputStream dstream, int startline, int startcolumn)
UCode_CharStream(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)
UCode_CharStream(java.io.Reader dstream, int startline, int startcolumn)
UCode_CharStream(java.io.Reader dstream, int startline, int startcolumn, int buffersize)
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Method Summary
All Methods Instance Methods Concrete Methods Deprecated Methods Modifier and Type Method Description void
adjustBeginLineColumn(int newLine, int newCol)
Method to adjust line and column numbers for the start of a token.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()
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
getBeginOffset()
int
getColumn()
Deprecated.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).int
getEndOffset()
java.lang.String
GetImage()
Returns a string made up of characters from the marked token beginning to the current buffer position.int
getLine()
Deprecated.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.private char
ReadChar()
void
ReInit(java.io.InputStream dstream, int startline, int startcolumn)
void
ReInit(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)
void
ReInit(java.io.Reader dstream, int startline, int startcolumn)
void
ReInit(java.io.Reader dstream, int startline, int startcolumn, int buffersize)
private void
UpdateLineColumn(char c)
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Field Detail
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charCnt
int charCnt
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charOffset
int[] charOffset
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staticFlag
public static final boolean staticFlag
- See Also:
- Constant Field Values
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bufpos
public int bufpos
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bufsize
int bufsize
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available
int available
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tokenBegin
int tokenBegin
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bufline
private int[] bufline
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bufcolumn
private int[] bufcolumn
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column
private int column
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line
private int line
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prevCharIsCR
private boolean prevCharIsCR
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prevCharIsLF
private boolean prevCharIsLF
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inputStream
private java.io.Reader inputStream
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nextCharBuf
private char[] nextCharBuf
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buffer
private char[] buffer
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maxNextCharInd
private int maxNextCharInd
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nextCharInd
private int nextCharInd
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inBuf
private int inBuf
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Constructor Detail
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UCode_CharStream
public UCode_CharStream(java.io.Reader dstream, int startline, int startcolumn, int buffersize)
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UCode_CharStream
public UCode_CharStream(java.io.Reader dstream, int startline, int startcolumn)
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UCode_CharStream
public UCode_CharStream(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)
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UCode_CharStream
public UCode_CharStream(java.io.InputStream dstream, int startline, int startcolumn)
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Method Detail
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ExpandBuff
private void ExpandBuff(boolean wrapAround)
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FillBuff
private void FillBuff() throws java.io.IOException
- Throws:
java.io.IOException
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ReadChar
private char ReadChar() throws java.io.IOException
- Throws:
java.io.IOException
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BeginToken
public 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 interfaceCharStream
- Throws:
java.io.IOException
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UpdateLineColumn
private void UpdateLineColumn(char c)
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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 interfaceCharStream
- Throws:
java.io.IOException
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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 interfaceCharStream
- See Also:
getEndColumn()
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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 interfaceCharStream
- See Also:
getEndLine()
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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 interfaceCharStream
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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 interfaceCharStream
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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 interfaceCharStream
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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 interfaceCharStream
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getBeginOffset
public final int getBeginOffset()
- Specified by:
getBeginOffset
in interfaceCharStream
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getEndOffset
public final int getEndOffset()
- Specified by:
getEndOffset
in interfaceCharStream
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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 interfaceCharStream
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ReInit
public void ReInit(java.io.Reader dstream, int startline, int startcolumn, int buffersize)
- Specified by:
ReInit
in interfaceCharStream
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ReInit
public void ReInit(java.io.Reader dstream, int startline, int startcolumn)
- Specified by:
ReInit
in interfaceCharStream
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ReInit
public void ReInit(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)
- Specified by:
ReInit
in interfaceCharStream
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ReInit
public void ReInit(java.io.InputStream dstream, int startline, int startcolumn)
- Specified by:
ReInit
in interfaceCharStream
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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 interfaceCharStream
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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 interfaceCharStream
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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 interfaceCharStream
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adjustBeginLineColumn
public void adjustBeginLineColumn(int newLine, int newCol)
Method to adjust line and column numbers for the start of a token.
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