Package gov.nih.mipav.model.file

Class MetadataExtractor.Iso2022Converter

java.lang.Object

gov.nih.mipav.model.file.MetadataExtractor.Iso2022Converter

Enclosing class:

MetadataExtractor

public final class MetadataExtractor.Iso2022Converter
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	DOT
private static final byte	DOT_SIGN
private static final byte	ESC
private static final String	ISO_8859_1
private static final byte	LATIN_CAPITAL_A
private static final byte	LATIN_CAPITAL_G
private static final byte	PERCENT_SIGN
private static final String	UTF_8

Constructor Summary

Constructors

Constructor	Description
Iso2022Converter()

Method Summary

Modifier and Type	Method	Description
String	convertISO2022CharsetToJavaCharset(byte[] bytes)	Converts the given ISO2022 char set to a Java charset name.
(package private) Charset	guessCharSet(byte[] bytes)	Attempts to guess the Charset of a string provided as a byte array.

Methods inherited from class java.lang.Object

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

Field Details

ISO_8859_1

private static final String ISO_8859_1

See Also:

• Constant Field Values

UTF_8

private static final String UTF_8

See Also:

• Constant Field Values

LATIN_CAPITAL_A

private static final byte LATIN_CAPITAL_A

See Also:

• Constant Field Values

DOT

private static final int DOT

See Also:

• Constant Field Values

LATIN_CAPITAL_G

private static final byte LATIN_CAPITAL_G

See Also:

• Constant Field Values

PERCENT_SIGN

private static final byte PERCENT_SIGN

See Also:

• Constant Field Values

DOT_SIGN

private static final byte DOT_SIGN

See Also:

• Constant Field Values

ESC

private static final byte ESC

See Also:

• Constant Field Values

Constructor Details

Iso2022Converter

public Iso2022Converter()

Method Details

convertISO2022CharsetToJavaCharset

public String convertISO2022CharsetToJavaCharset(byte[] bytes)

Converts the given ISO2022 char set to a Java charset name. A reference of valid charsets can be found here: http://nozer0.github.io/en/technology/system/character-encoding/#ISO/IEC%202022

Parameters:

bytes - string data encoded using ISO2022

Returns:

the Java charset name as a string, or null if the conversion was not possible

guessCharSet

Charset guessCharSet(byte[] bytes)

Attempts to guess the Charset of a string provided as a byte array.

Charsets trialled are, in order:

• UTF-8
• System.getProperty("file.encoding")
• ISO-8859-1

Its only purpose is to guess the Charset if and only if IPTC tag coded character set is not set. If the encoding is not UTF-8, the tag should be set. Otherwise it is bad practice. This method tries to workaround this issue since some metadata manipulating tools do not prevent such bad practice.

About the reliability of this method: The check if some bytes are UTF-8 or not has a very high reliability. The two other checks are less reliable.

Parameters:

bytes - some text as bytes

Returns:

the name of the encoding or null if none could be guessed