UnicodeInputStream (Apache Velocity 2.1 API)

java.lang.Object
- java.io.InputStream
- - org.apache.velocity.io.UnicodeInputStream

All Implemented Interfaces:

Closeable, AutoCloseable
```
public class UnicodeInputStream
extends InputStream
```
This is an input stream that is unicode BOM aware. This allows you to e.g. read Windows Notepad Unicode files as Velocity templates. It allows you to check the actual encoding of a file by calling getEncodingFromStream() on the input stream reader. This class is not thread safe! When more than one thread wants to use an instance of UnicodeInputStream, the caller must provide synchronization.

Since:

1.5

Version:

$Id: UnicodeInputStream.java 1855206 2019-03-11 11:09:53Z cbrisson $

Author:

Aki Nieminen, Henning P. Schmiedehausen

Field Summary

Fields
Modifier and Type	Field and Description
`static org.apache.velocity.io.UnicodeInputStream.UnicodeBOM`	`UTF16BE_BOM` BOM Marker for UTF 16, big endian.
`static org.apache.velocity.io.UnicodeInputStream.UnicodeBOM`	`UTF16LE_BOM` BOM Marker for UTF 16, little endian.
`static org.apache.velocity.io.UnicodeInputStream.UnicodeBOM`	`UTF32BE_BOM` BOM Marker for UTF 32, big endian.
`static org.apache.velocity.io.UnicodeInputStream.UnicodeBOM`	`UTF32LE_BOM` BOM Marker for UTF 32, little endian.
`static org.apache.velocity.io.UnicodeInputStream.UnicodeBOM`	`UTF8_BOM` BOM Marker for UTF 8.

Constructor Summary

Constructors
Constructor and Description
`UnicodeInputStream(InputStream inputStream)` Creates a new UnicodeInputStream object.
`UnicodeInputStream(InputStream inputStream, boolean skipBOM)` Creates a new UnicodeInputStream object.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`int`	`available()`
`void`	`close()`
`String`	`getEncodingFromStream()` Read encoding based on BOM.
`boolean`	`isSkipBOM()` Returns true if the input stream discards the BOM.
`void`	`mark(int readlimit)`
`boolean`	`markSupported()`
`int`	`read()`
`int`	`read(byte[] b)`
`int`	`read(byte[] b, int off, int len)`
`protected String`	`readEncoding()` This method gets the encoding from the stream contents if a BOM exists.
`void`	`reset()`
`static boolean`	`sameEncoding(String left, String right)` Helper function to compare encodings
`long`	`skip(long n)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - UTF8_BOM
```
public static final org.apache.velocity.io.UnicodeInputStream.UnicodeBOM UTF8_BOM
```
    BOM Marker for UTF 8. See http://www.unicode.org/unicode/faq/utf_bom.html
  - UTF16LE_BOM
```
public static final org.apache.velocity.io.UnicodeInputStream.UnicodeBOM UTF16LE_BOM
```
    BOM Marker for UTF 16, little endian. See http://www.unicode.org/unicode/faq/utf_bom.html
  - UTF16BE_BOM
```
public static final org.apache.velocity.io.UnicodeInputStream.UnicodeBOM UTF16BE_BOM
```
    BOM Marker for UTF 16, big endian. See http://www.unicode.org/unicode/faq/utf_bom.html
  - UTF32LE_BOM
```
public static final org.apache.velocity.io.UnicodeInputStream.UnicodeBOM UTF32LE_BOM
```
    BOM Marker for UTF 32, little endian. See http://www.unicode.org/unicode/faq/utf_bom.html
  - UTF32BE_BOM
```
public static final org.apache.velocity.io.UnicodeInputStream.UnicodeBOM UTF32BE_BOM
```
    BOM Marker for UTF 32, big endian. See http://www.unicode.org/unicode/faq/utf_bom.html
- Constructor Detail
  - UnicodeInputStream
```
public UnicodeInputStream(InputStream inputStream)
                   throws IllegalStateException,
                          IOException
```
    Creates a new UnicodeInputStream object. Skips a BOM which defines the file encoding.
    
    Parameters:
    
    inputStream - The input stream to use for reading.
    
    Throws:
    
    IllegalStateException
    
    IOException
  - UnicodeInputStream
```
public UnicodeInputStream(InputStream inputStream,
                          boolean skipBOM)
                   throws IllegalStateException,
                          IOException
```
    Creates a new UnicodeInputStream object.
    
    Parameters:
    
    inputStream - The input stream to use for reading.
    
    skipBOM - If this is set to true, a BOM read from the stream is discarded. This parameter should normally be true.
    
    Throws:
    
    IllegalStateException
    
    IOException
- Method Detail
  - isSkipBOM
```
public boolean isSkipBOM()
```
    Returns true if the input stream discards the BOM.
    
    Returns:
    
    True if the input stream discards the BOM.
  - getEncodingFromStream
```
public String getEncodingFromStream()
```
    Read encoding based on BOM.
    
    Returns:
    
    The encoding based on the BOM.
    
    Throws:
    
    IllegalStateException - When a problem reading the BOM occured.
  - readEncoding
```
protected String readEncoding()
                       throws IOException
```
    This method gets the encoding from the stream contents if a BOM exists. If no BOM exists, the encoding is undefined.
    
    Returns:
    
    The encoding of this streams contents as decided by the BOM or null if no BOM was found.
    
    Throws:
    
    IOException
  - close
```
public void close()
           throws IOException
```
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Overrides:
    
    close in class InputStream
    
    Throws:
    
    IOException
    
    See Also:
    
    InputStream.close()
  - available
```
public int available()
              throws IOException
```
    Overrides:
    
    available in class InputStream
    
    Throws:
    
    IOException
    
    See Also:
    
    InputStream.available()
  - mark
```
public void mark(int readlimit)
```
    Overrides:
    
    mark in class InputStream
    
    Parameters:
    
    readlimit -
    
    See Also:
    
    InputStream.mark(int)
  - markSupported
```
public boolean markSupported()
```
    Overrides:
    
    markSupported in class InputStream
    
    Returns:
    
    mark supported
    
    See Also:
    
    InputStream.markSupported()
  - read
```
public int read()
         throws IOException
```
    Specified by:
    
    read in class InputStream
    
    Returns:
    
    read char
    
    Throws:
    
    IOException
    
    See Also:
    
    InputStream.read()
  - read
```
public int read(byte[] b)
         throws IOException
```
    Overrides:
    
    read in class InputStream
    
    Parameters:
    
    b - buffer
    
    Returns:
    
    read chars count
    
    Throws:
    
    IOException
    
    See Also:
    
    InputStream.read(byte[])
  - read
```
public int read(byte[] b,
                int off,
                int len)
         throws IOException
```
    Overrides:
    
    read in class InputStream
    
    Parameters:
    
    b - buffer
    
    off - offset
    
    len - length
    
    Returns:
    
    reac char
    
    Throws:
    
    IOException
    
    See Also:
    
    InputStream.read(byte[], int, int)
  - reset
```
public void reset()
           throws IOException
```
    Overrides:
    
    reset in class InputStream
    
    Throws:
    
    IOException
    
    See Also:
    
    InputStream.reset()
  - skip
```
public long skip(long n)
          throws IOException
```
    Overrides:
    
    skip in class InputStream
    
    Parameters:
    
    n -
    
    Returns:
    
    skipped count
    
    Throws:
    
    IOException
    
    See Also:
    
    InputStream.skip(long)
  - sameEncoding
```
public static boolean sameEncoding(String left,
                                   String right)
```
    Helper function to compare encodings
    
    Parameters:
    
    left -
    
    right -
    
    Returns:
    
    true for same encoding

Class UnicodeInputStream

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

UTF8_BOM

UTF16LE_BOM

UTF16BE_BOM

UTF32LE_BOM

UTF32BE_BOM

Constructor Detail

UnicodeInputStream

UnicodeInputStream

Method Detail

isSkipBOM

getEncodingFromStream

readEncoding

close

available

mark

markSupported

read

read

read

reset

skip

sameEncoding