com.fasterxml.jackson.core

Class Base64Variants

java.lang.Object

com.fasterxml.jackson.core.Base64Variants

public final class Base64Variants
extends Object

Container for commonly used Base64 variants:

• MIME
• MIME_NO_LINEFEEDS
• PEM
• MODIFIED_FOR_URL

Author:

Tatu Saloranta

Field Summary

Fields

Modifier and Type	Field and Description
static Base64Variant	MIME This variant is what most people would think of "the standard" Base64 encoding.
static Base64Variant	MIME_NO_LINEFEEDS Slightly non-standard modification of MIME which does not use linefeeds (max line length set to infinite).
static Base64Variant	MODIFIED_FOR_URL This non-standard variant is usually used when encoded data needs to be passed via URLs (such as part of GET request).
static Base64Variant	PEM This variant is the one that predates MIME: it is otherwise identical, except that it mandates shorter line length.

Constructor Summary

Constructors

Constructor and Description
Base64Variants()

Method Summary

Methods

Modifier and Type	Method and Description
static Base64Variant	getDefaultVariant() Method used to get the default variant ("MIME_NO_LINEFEEDS") for cases where caller does not explicitly specify the variant.
static Base64Variant	valueOf(String name)

Methods inherited from class java.lang.Object

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

Field Detail

MIME

public static final Base64Variant MIME

This variant is what most people would think of "the standard" Base64 encoding.

See wikipedia Base64 entry for details.

Note that although this can be thought of as the standard variant, it is not the default for Jackson: no-linefeeds alternative is because of JSON requirement of escaping all linefeeds.

MIME_NO_LINEFEEDS

public static final Base64Variant MIME_NO_LINEFEEDS

Slightly non-standard modification of MIME which does not use linefeeds (max line length set to infinite). Useful when linefeeds wouldn't work well (possibly in attributes), or for minor space savings (save 1 linefeed per 76 data chars, ie. ~1.4% savings).

PEM

public static final Base64Variant PEM

This variant is the one that predates MIME: it is otherwise identical, except that it mandates shorter line length.

MODIFIED_FOR_URL

public static final Base64Variant MODIFIED_FOR_URL

This non-standard variant is usually used when encoded data needs to be passed via URLs (such as part of GET request). It differs from the base MIME variant in multiple ways. First, no padding is used: this also means that it generally can not be written in multiple separate but adjacent chunks (which would not be the usual use case in any case). Also, no linefeeds are used (max line length set to infinite). And finally, two characters (plus and slash) that would need quoting in URLs are replaced with more optimal alternatives (hyphen and underscore, respectively).

Constructor Detail

Base64Variants

public Base64Variants()

Method Detail

getDefaultVariant

public static Base64Variant getDefaultVariant()

Method used to get the default variant ("MIME_NO_LINEFEEDS") for cases where caller does not explicitly specify the variant. We will prefer no-linefeed version because linefeeds in JSON values must be escaped, making linefeed-containing variants sub-optimal.

valueOf

public static Base64Variant valueOf(String name)
                             throws IllegalArgumentException

Throws:

IllegalArgumentException

Since:

2.1