org.opencms.i18n
Class CmsEncoder

java.lang.Object
  org.opencms.i18n.CmsEncoder

public final class CmsEncoder
extends java.lang.Object

The OpenCms CmsEncoder class provides static methods to decode and encode data.

The methods in this class are substitutes for java.net.URLEncoder.encode() and java.net.URLDecoder.decode(). Use the methods from this class in all OpenCms core classes to ensure the encoding is always handled the same way.

The de- and encoding uses the same coding mechanism as JavaScript, special characters are replaced with %hex where hex is a two digit hex number.

Note: On the client side (browser) instead of using corresponding escape and unescape JavaScript functions, better use encodeURIComponent and decodeURIComponent functions which are work properly with unicode characters. These functions are supported in IE 5.5+ and NS 6+ only.

Since:

6.0.0

Version:

$Revision: 1.29 $

Author:

Alexander Kandzior

Field Summary

static java.lang.String	ENCODING_ISO_8859_1 Constant for the standard ISO-8859-1 encoding.
static java.lang.String	ENCODING_US_ASCII Constant for the standard US-ASCII encoding.
static java.lang.String	ENCODING_UTF_8 Constant for the standard UTF-8 encoding.

Method Summary

static java.lang.String	adjustHtmlEncoding(java.lang.String input, java.lang.String encoding) Adjusts the given String by making sure all characters that can be displayed in the given charset are contained as chars, whereas all other non-displayable characters are converted to HTML entities.
static byte[]	changeEncoding(byte[] input, java.lang.String oldEncoding, java.lang.String newEncoding) Changes the encoding of a byte array that represents a String.
static java.lang.String	createString(byte[] bytes, java.lang.String encoding) Creates a String out of a byte array with the specified encoding, falling back to the system default in case the encoding name is not valid.
static java.lang.String	decode(java.lang.String source) Decodes a String using UTF-8 encoding, which is the standard for http data transmission with GET ant POST requests.
static java.lang.String	decode(java.lang.String source, java.lang.String encoding) This method is a substitute for URLDecoder.decode().
static java.lang.String	decodeHtmlEntities(java.lang.String input, java.lang.String encoding) Decodes HTML entity references like € that are contained in the String to a regular character, but only if that character is contained in the given encodings charset.
static java.lang.String	decodeParameter(java.lang.String input) Decodes a string used as parameter in an uri in a way independent of other encodings/decodings applied before.
static java.lang.String	encode(java.lang.String source) Encodes a String using UTF-8 encoding, which is the standard for http data transmission with GET ant POST requests.
static java.lang.String	encode(java.lang.String source, java.lang.String encoding) This method is a substitute for URLEncoder.encode().
static java.lang.String	encodeHtmlEntities(java.lang.String input, java.lang.String encoding) Encodes all characters that are contained in the String which can not displayed in the given encodings charset with HTML entity references like €.
static java.lang.String	encodeJavaEntities(java.lang.String input, java.lang.String encoding) Encodes all characters that are contained in the String which can not displayed in the given encodings charset with Java escaping like €.
static java.lang.String	encodeParameter(java.lang.String input) Encodes a string used as parameter in an uri in a way independent of other encodings/decodings applied later.
static java.lang.String	escape(java.lang.String source, java.lang.String encoding) Encodes a String in a way that is compatible with the JavaScript escape function.
static java.lang.String	escapeHtml(java.lang.String source) Escapes special characters in a HTML-String with their number-based entity representation, for example & becomes &.
static java.lang.String	escapeNonAscii(java.lang.String source) Escapes non ASCII characters in a HTML-String with their number-based entity representation, for example & becomes &.
static java.lang.String	escapeSql(java.lang.String source) A simple method to avoid injection.
static java.lang.String	escapeWBlanks(java.lang.String source, java.lang.String encoding) Encodes a String in a way that is compatible with the JavaScript escape function.
static java.lang.String	escapeXml(java.lang.String source) Escapes a String so it may be printed as text content or attribute value in a HTML page or an XML file.
static java.lang.String	escapeXml(java.lang.String source, boolean doubleEscape) Escapes a String so it may be printed as text content or attribute value in a HTML page or an XML file.
static java.lang.String	lookupEncoding(java.lang.String encoding, java.lang.String fallback) Checks if a given encoding name is actually supported, and if so resolves it to it's canonical name, if not it returns the given fallback value.
static java.lang.String	redecodeUriComponent(java.lang.String input) Re-decodes a String that has not been correctly decoded and thus has scrambled character bytes.
static java.lang.String	unescape(java.lang.String source, java.lang.String encoding) Decodes a String in a way that is compatible with the JavaScript unescape function.

Methods inherited from class java.lang.Object

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

Field Detail

ENCODING_ISO_8859_1

public static final java.lang.String ENCODING_ISO_8859_1

Constant for the standard ISO-8859-1 encoding.

See Also:

Constant Field Values

ENCODING_US_ASCII

public static final java.lang.String ENCODING_US_ASCII

Constant for the standard US-ASCII encoding.

See Also:

Constant Field Values

ENCODING_UTF_8

public static final java.lang.String ENCODING_UTF_8

Constant for the standard UTF-8 encoding.

Default encoding for JavaScript decodeUriComponent methods is UTF-8 by w3c standard.

See Also:

Constant Field Values

Method Detail

adjustHtmlEncoding

public static java.lang.String adjustHtmlEncoding(java.lang.String input,
                                                  java.lang.String encoding)

Adjusts the given String by making sure all characters that can be displayed in the given charset are contained as chars, whereas all other non-displayable characters are converted to HTML entities.

Just calls decodeHtmlEntities(String, String) first and feeds the result to encodeHtmlEntities(String, String).

Parameters:

input - the input to adjust the HTML encoding for

encoding - the charset to encode the result with\

Returns:

the input with the decoded/encoded HTML entities

changeEncoding

public static byte[] changeEncoding(byte[] input,
                                    java.lang.String oldEncoding,
                                    java.lang.String newEncoding)

Changes the encoding of a byte array that represents a String.

Parameters:

input - the byte array to convert

oldEncoding - the current encoding of the byte array

newEncoding - the new encoding of the byte array

Returns:

the byte array encoded in the new encoding

createString

public static java.lang.String createString(byte[] bytes,
                                            java.lang.String encoding)

Creates a String out of a byte array with the specified encoding, falling back to the system default in case the encoding name is not valid.

Use this method as a replacement for new String(byte[], encoding) to avoid possible encoding problems.

Parameters:

bytes - the bytes to decode

encoding - the encoding scheme to use for decoding the bytes

Returns:

the bytes decoded to a String

decode

public static java.lang.String decode(java.lang.String source)

Decodes a String using UTF-8 encoding, which is the standard for http data transmission with GET ant POST requests.

Parameters:

source - the String to decode

Returns:

String the decoded source String

decode

public static java.lang.String decode(java.lang.String source,
                                      java.lang.String encoding)

This method is a substitute for URLDecoder.decode(). Use this in all OpenCms core classes to ensure the encoding is always handled the same way.

In case you don't know what encoding to use, set the value of the encoding parameter to null. This method will then default to UTF-8 encoding, which is probably the right one.

Parameters:

source - The string to decode

encoding - The encoding to use (if null, the system default is used)

Returns:

The decoded source String

decodeHtmlEntities

public static java.lang.String decodeHtmlEntities(java.lang.String input,
                                                  java.lang.String encoding)

Decodes HTML entity references like € that are contained in the String to a regular character, but only if that character is contained in the given encodings charset.

Parameters:

input - the input to decode the HTML entities in

encoding - the charset to decode the input for

Returns:

the input with the decoded HTML entities

See Also:

encodeHtmlEntities(String, String)

decodeParameter

public static java.lang.String decodeParameter(java.lang.String input)

Decodes a string used as parameter in an uri in a way independent of other encodings/decodings applied before.

Parameters:

input - the encoded parameter string

Returns:

the decoded parameter string

See Also:

encodeParameter(String)

encode

public static java.lang.String encode(java.lang.String source)

Encodes a String using UTF-8 encoding, which is the standard for http data transmission with GET ant POST requests.

Parameters:

source - the String to encode

Returns:

String the encoded source String

encode

public static java.lang.String encode(java.lang.String source,
                                      java.lang.String encoding)

This method is a substitute for URLEncoder.encode(). Use this in all OpenCms core classes to ensure the encoding is always handled the same way.

In case you don't know what encoding to use, set the value of the encoding parameter to null. This method will then default to UTF-8 encoding, which is probably the right one.

Parameters:

source - the String to encode

encoding - the encoding to use (if null, the system default is used)

Returns:

the encoded source String

encodeHtmlEntities

public static java.lang.String encodeHtmlEntities(java.lang.String input,
                                                  java.lang.String encoding)

Encodes all characters that are contained in the String which can not displayed in the given encodings charset with HTML entity references like €.

This is required since a Java String is internally always stored as Unicode, meaning it can contain almost every character, but the HTML charset used might not support all such characters.

Parameters:

input - the input to encode for HTML

encoding - the charset to encode the result with

Returns:

the input with the encoded HTML entities

See Also:

decodeHtmlEntities(String, String)

encodeJavaEntities

public static java.lang.String encodeJavaEntities(java.lang.String input,
                                                  java.lang.String encoding)

Encodes all characters that are contained in the String which can not displayed in the given encodings charset with Java escaping like €.

This can be used to escape values used in Java property files.

Parameters:

input - the input to encode for Java

encoding - the charset to encode the result with

Returns:

the input with the encoded Java entities

encodeParameter

public static java.lang.String encodeParameter(java.lang.String input)

Encodes a string used as parameter in an uri in a way independent of other encodings/decodings applied later.

Used to ensure that GET parameters are not wrecked by wrong or incompatible configuration settings. In order to ensure this, the String is first encoded with html entities for any character that cannot encoded in US-ASCII; additionally, the plus sign is also encoded to avoid problems with the white-space replacer. Finally, the entity prefix is replaced with characters not used as delimiters in urls.

Parameters:

input - the parameter string

Returns:

the encoded parameter string

escape

public static java.lang.String escape(java.lang.String source,
                                      java.lang.String encoding)

Encodes a String in a way that is compatible with the JavaScript escape function.

Parameters:

source - The text to be encoded

encoding - the encoding type

Returns:

The JavaScript escaped string

escapeHtml

public static java.lang.String escapeHtml(java.lang.String source)

Escapes special characters in a HTML-String with their number-based entity representation, for example & becomes &.

A character num is replaced if
((ch != 32) && ((ch > 122) || (ch < 48) || (ch == 60) || (ch == 62)))

Parameters:

source - the String to escape

Returns:

String the escaped String

See Also:

escapeXml(String)

escapeNonAscii

public static java.lang.String escapeNonAscii(java.lang.String source)

Escapes non ASCII characters in a HTML-String with their number-based entity representation, for example & becomes &.

A character num is replaced if
(ch > 255)

Parameters:

source - the String to escape

Returns:

String the escaped String

See Also:

escapeXml(String)

escapeWBlanks

public static java.lang.String escapeWBlanks(java.lang.String source,
                                             java.lang.String encoding)

Encodes a String in a way that is compatible with the JavaScript escape function. Multiple blanks are encoded _multiply _with %20.

Parameters:

source - The text to be encoded

encoding - the encoding type

Returns:

The JavaScript escaped string

escapeXml

public static java.lang.String escapeXml(java.lang.String source)

Escapes a String so it may be printed as text content or attribute value in a HTML page or an XML file.

This method replaces the following characters in a String:

• < with &lt;
• > with &gt;
• & with &amp;
• " with &quot;

Parameters:

source - the string to escape

Returns:

the escaped string

See Also:

escapeHtml(String)

escapeXml

public static java.lang.String escapeXml(java.lang.String source,
                                         boolean doubleEscape)

Escapes a String so it may be printed as text content or attribute value in a HTML page or an XML file.

This method replaces the following characters in a String:

• < with &lt;
• > with &gt;
• & with &amp;
• " with &quot;

Parameters:

source - the string to escape

doubleEscape - if false, all entities that already are escaped are left untouched

Returns:

the escaped string

See Also:

escapeHtml(String)

lookupEncoding

public static java.lang.String lookupEncoding(java.lang.String encoding,
                                              java.lang.String fallback)

Checks if a given encoding name is actually supported, and if so resolves it to it's canonical name, if not it returns the given fallback value.

Charsets have a set of aliases. For example, valid aliases for "UTF-8" are "UTF8", "utf-8" or "utf8". This method resolves any given valid charset name to it's "canonical" form, so that simple String comparison can be used when checking charset names internally later.

Please see http://www.iana.org/assignments/character-sets for a list of valid charset alias names.

Parameters:

encoding - the encoding to check and resolve

fallback - the fallback encoding scheme

Returns:

the resolved encoding name, or the fallback value

redecodeUriComponent

public static java.lang.String redecodeUriComponent(java.lang.String input)

Re-decodes a String that has not been correctly decoded and thus has scrambled character bytes.

This is an equivalent to the JavaScript "decodeURIComponent" function. It converts from the default "UTF-8" to the currently selected system encoding.

Parameters:

input - the String to convert

Returns:

String the converted String

unescape

public static java.lang.String unescape(java.lang.String source,
                                        java.lang.String encoding)

Decodes a String in a way that is compatible with the JavaScript unescape function.

Parameters:

source - The String to be decoded

encoding - the encoding type

Returns:

The JavaScript unescaped String

escapeSql

public static java.lang.String escapeSql(java.lang.String source)

A simple method to avoid injection.

Replaces all single quotes to double single quotes in the value parameter of the sql statement.

Parameters:

source - the String to escape SQL from

Returns:

the escaped value of the parameter source