com.google.api.client.util.escape

Class CharEscapers

java.lang.Object

com.google.api.client.util.escape.CharEscapers

public final class CharEscapers
extends Object

Utility functions for dealing with CharEscapers, and some commonly used CharEscaper instances.

Since:

1.0

Method Summary

Modifier and Type	Method and Description
static String	decodeUri(String uri) Percent-decodes a US-ASCII string into a Unicode string.
static String	escapeUri(String value) Escapes the string value so it can be safely included in URIs.
static String	escapeUriPath(String value) Escapes the string value so it can be safely included in URI path segments.
static String	escapeUriPathWithoutReserved(String value) Escapes a URI path but retains all reserved characters, including all general delimiters.
static String	escapeUriQuery(String value) Escapes the string value so it can be safely included in URI query string segments.
static String	escapeUriUserInfo(String value) Escapes the string value so it can be safely included in URI user info part.

Methods inherited from class java.lang.Object

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

Method Detail

escapeUri

public static String escapeUri(String value)

Escapes the string value so it can be safely included in URIs. For details on escaping URIs, see RFC 3986 - section 2.4.

When encoding a String, the following rules apply:

• The alphanumeric characters "a" through "z", "A" through "Z" and "0" through "9" remain the same.
• The special characters ".", "-", "*", and "_" remain the same.
• The space character " " is converted into a plus sign "+".
• All other characters are converted into one or more bytes using UTF-8 encoding and each byte is then represented by the 3-character string "%XY", where "XY" is the two-digit, uppercase, hexadecimal representation of the byte value.

Note: Unlike other escapers, URI escapers produce uppercase hexadecimal sequences. From RFC 3986:
"URI producers and normalizers should use uppercase hexadecimal digits for all percent-encodings."

This escaper has identical behavior to (but is potentially much faster than):

• URLEncoder.encode(String, String) with the encoding name "UTF-8"

decodeUri

public static String decodeUri(String uri)

Percent-decodes a US-ASCII string into a Unicode string. UTF-8 encoding is used to determine what characters are represented by any consecutive sequences of the form "%XX".

This replaces each occurrence of '+' with a space, ' '. So this method should not be used for non application/x-www-form-urlencoded strings such as host and path.

Parameters:

uri - a percent-encoded US-ASCII string

Returns:

a Unicode string

escapeUriPath

public static String escapeUriPath(String value)

Escapes the string value so it can be safely included in URI path segments. For details on escaping URIs, see RFC 3986 - section 2.4.

When encoding a String, the following rules apply:

• The alphanumeric characters "a" through "z", "A" through "Z" and "0" through "9" remain the same.
• The unreserved characters ".", "-", "~", and "_" remain the same.
• The general delimiters "@" and ":" remain the same.
• The subdelimiters "!", "$", "&", "'", "(", ")", "*", ",", ";", and "=" remain the same.
• The space character " " is converted into %20.
• All other characters are converted into one or more bytes using UTF-8 encoding and each byte is then represented by the 3-character string "%XY", where "XY" is the two-digit, uppercase, hexadecimal representation of the byte value.

Note: Unlike other escapers, URI escapers produce uppercase hexadecimal sequences. From RFC 3986:
"URI producers and normalizers should use uppercase hexadecimal digits for all percent-encodings."

escapeUriPathWithoutReserved

public static String escapeUriPathWithoutReserved(String value)

Escapes a URI path but retains all reserved characters, including all general delimiters. That is the same as escapeUriPath(String) except that it keeps '?', '+', and '/' unescaped.

escapeUriUserInfo

public static String escapeUriUserInfo(String value)

Escapes the string value so it can be safely included in URI user info part. For details on escaping URIs, see RFC 3986 - section 2.4.

When encoding a String, the following rules apply:

• The alphanumeric characters "a" through "z", "A" through "Z" and "0" through "9" remain the same.
• The unreserved characters ".", "-", "~", and "_" remain the same.
• The general delimiter ":" remains the same.
• The subdelimiters "!", "$", "&", "'", "(", ")", "*", ",", ";", and "=" remain the same.
• The space character " " is converted into %20.
• All other characters are converted into one or more bytes using UTF-8 encoding and each byte is then represented by the 3-character string "%XY", where "XY" is the two-digit, uppercase, hexadecimal representation of the byte value.

Note: Unlike other escapers, URI escapers produce uppercase hexadecimal sequences. From RFC 3986:
"URI producers and normalizers should use uppercase hexadecimal digits for all percent-encodings."

Since:

1.15

escapeUriQuery

public static String escapeUriQuery(String value)

Escapes the string value so it can be safely included in URI query string segments. When the query string consists of a sequence of name=value pairs separated by &, the names and values should be individually encoded. If you escape an entire query string in one pass with this escaper, then the "=" and "&" characters used as separators will also be escaped.

This escaper is also suitable for escaping fragment identifiers.

For details on escaping URIs, see RFC 3986 - section 2.4.

When encoding a String, the following rules apply:

• The alphanumeric characters "a" through "z", "A" through "Z" and "0" through "9" remain the same.
• The unreserved characters ".", "-", "~", and "_" remain the same.
• The general delimiters "@" and ":" remain the same.
• The path delimiters "/" and "?" remain the same.
• The subdelimiters "!", "$", "'", "(", ")", "*", ",", and ";", remain the same.
• The space character " " is converted into %20.
• The equals sign "=" is converted into %3D.
• The ampersand "&" is converted into %26.
• All other characters are converted into one or more bytes using UTF-8 encoding and each byte is then represented by the 3-character string "%XY", where "XY" is the two-digit, uppercase, hexadecimal representation of the byte value.

Note: Unlike other escapers, URI escapers produce uppercase hexadecimal sequences. From RFC 3986:
"URI producers and normalizers should use uppercase hexadecimal digits for all percent-encodings."