org.apache.velocity.tools.generic
Class EscapeTool

java.lang.Object
  extended by org.apache.velocity.tools.generic.SafeConfig
      extended by org.apache.velocity.tools.generic.EscapeTool

@DefaultKey(value="esc")
public class EscapeTool
extends SafeConfig

Tool for working with escaping in Velocity templates. It provides methods to escape outputs for Velocity, Java, JavaScript, HTML, HTTP, XML and SQL. Also provides methods to render VTL characters that otherwise needs escaping.

 Example uses:
  $velocity                    -> Please escape $ and #!
  $esc.velocity($velocity)     -> Please escape ${esc.d} and ${esc.h}!

  $java                        -> He didn't say, "Stop!"
  $esc.java($java)             -> He didn't say, \"Stop!\"

  $javascript                  -> He didn't say, "Stop!"
  $esc.javascript($javascript) -> He didn\'t say, \"Stop!\"

  $html                        -> "bread" & "butter"
  $esc.html($html)             -> "bread" & "butter"

  $xml                         -> "bread" & "butter"
  $esc.xml($xml)               -> "bread" & "butter"

  $sql                         -> McHale's Navy
  $esc.sql($sql)               -> McHale''s Navy

  $url                         -> hello here & there
  $esc.url                     -> hello+here+%26+there

  $esc.dollar                  -> $
  $esc.d                       -> $

  $esc.hash                    -> #
  $esc.h                       -> #

  $esc.backslash               -> \
  $esc.b                       -> \

  $esc.quote                   -> "
  $esc.q                       -> "

  $esc.singleQuote             -> '
  $esc.s                       -> '

  $esc.newline                 -> 

  $esc.n                       -> 


  $esc.exclamation             -> !
  $esc.e                       -> !

 Example tools.xml config (if you want to use this with VelocityView):
 <tools>
   <toolbox scope="application">
     <tool class="org.apache.velocity.tools.generic.EscapeTool"/>
   </toolbox>
 </tools>
 

This tool is entirely threadsafe, and has no instance members. It may be used in any scope (request, session, or application).

Since:
VelocityTools 1.2
Version:
$Id: $
Author:
Shinobu Kawai
See Also:
StringEscapeUtils

Field Summary
static String DEFAULT_KEY
           
 
Fields inherited from class org.apache.velocity.tools.generic.SafeConfig
LOCK_CONFIG_KEY, OLD_LOCK_CONFIG_KEY, SAFE_MODE_KEY
 
Constructor Summary
EscapeTool()
           
 
Method Summary
protected  void configure(ValueParser values)
          Does the actual configuration.
protected  String dumpString(String string, boolean key)
          This code was pulled from the Apache Harmony project.
 String getB()
          Renders a backslash (\).
 String getBackslash()
          Renders a backslash (\).
 String getD()
          Renders a dollar sign ($).
 String getDollar()
          Renders a dollar sign ($).
 String getE()
          Renders an exclamation mark (!).
 String getExclamation()
          Renders an exclamation mark (!).
 String getH()
          Renders a hash (#).
 String getHash()
          Renders a hash (#).
 String getKey()
          Should return the key under which this tool has been configured.
 String getN()
          Renders a new line character appropriate for the operating system ("\n" in java).
 String getNewline()
          Renders a new line character appropriate for the operating system ("\n" in java).
 String getQ()
          Renders a double quotation mark (").
 String getQuote()
          Renders a double quotation mark (").
 String getS()
          Renders a single quotation mark (').
 String getSingleQuote()
          Renders a single quotation mark (').
 String html(Object string)
          Escapes the characters in a String using HTML entities.
 String java(Object string)
          Escapes the characters in a String using Java String rules.
 String javascript(Object string)
          Escapes the characters in a String using JavaScript String rules.
 String propertyKey(Object string)
          Escapes the characters in a String using java.util.Properties rules for escaping property keys.
 String propertyValue(Object string)
          Escapes the characters in a String using java.util.Properties rules for escaping property values.
protected  void setKey(String key)
          Sets the key under which this tool has been configured.
 String sql(Object string)
          Escapes the characters in a String to be suitable to pass to an SQL query.
 String unicode(Object code)
          Converts the specified Unicode code point and/or escape sequence into the associated Unicode character.
 String url(Object string)
          Escape the characters in a String to be suitable to use as an HTTP parameter value.
 String velocity(Object obj)
          Escapes the characters in a String using "poor man's escaping" for Velocity templates by replacing all '$' characters with '${esc.d}' and all '#' characters with '${esc.h}'.
 String xml(Object string)
          Escapes the characters in a String using XML entities.
 
Methods inherited from class org.apache.velocity.tools.generic.SafeConfig
configure, isConfigLocked, isSafeMode, setLockConfig, setSafeMode
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

DEFAULT_KEY

public static final String DEFAULT_KEY
See Also:
Constant Field Values
Constructor Detail

EscapeTool

public EscapeTool()
Method Detail

configure

protected void configure(ValueParser values)
Does the actual configuration. This is protected, so subclasses may share the same ValueParser and call configure at any time, while preventing templates from doing so when configure(Map) is locked.

Overrides:
configure in class SafeConfig

setKey

protected void setKey(String key)
Sets the key under which this tool has been configured.

See Also:
velocity(java.lang.Object)

getKey

public String getKey()
Should return the key under which this tool has been configured. The default is 'esc'.

See Also:
velocity(java.lang.Object)

velocity

public String velocity(Object obj)

Escapes the characters in a String using "poor man's escaping" for Velocity templates by replacing all '$' characters with '${esc.d}' and all '#' characters with '${esc.h}'. This form of escaping is far more reliable and consistent than using '\' to escape valid references, directives and macros, though it does require that you have the EscapeTool available in the context when you later go to process the result returned by this method.

NOTE: This will only work so long as the EscapeTool is placed in the context using its default key 'esc' or you are using VelocityTools 2.0+ and have put this tool in one of your toolboxes under an alternate key (in which case the EscapeTool will automatically be told what its new key is). If for some strange reason you wish to use an alternate key and are not using the tool management facilities of VelocityTools 2.0+, you must subclass this tool and manually call setKey(String) before using this method.

Parameters:
obj - the string value that needs escaping
Returns:
String with escaped values, null if null string input

java

public String java(Object string)
Escapes the characters in a String using Java String rules.
Delegates the process to StringEscapeUtils.escapeJava(String).

Parameters:
string - the string to escape values, may be null
Returns:
String with escaped values, null if null string input
See Also:
StringEscapeUtils.escapeJava(String)

propertyKey

public String propertyKey(Object string)
Escapes the characters in a String using java.util.Properties rules for escaping property keys.

Parameters:
string - the string to escape values, may be null
Returns:
String with escaped values, null if null string input
See Also:
dumpString(String, boolean)

propertyValue

public String propertyValue(Object string)
Escapes the characters in a String using java.util.Properties rules for escaping property values.

Parameters:
string - the string to escape values, may be null
Returns:
String with escaped values, null if null string input
See Also:
dumpString(String, boolean)

dumpString

protected String dumpString(String string,
                            boolean key)
This code was pulled from the Apache Harmony project. See https://svn.apache.org/repos/asf/harmony/enhanced/classlib/trunk/modules/luni/src/main/java/java/util/Properties.java


javascript

public String javascript(Object string)
Escapes the characters in a String using JavaScript String rules.
Delegates the process to StringEscapeUtils.escapeJavaScript(String).

Parameters:
string - the string to escape values, may be null
Returns:
String with escaped values, null if null string input
See Also:
StringEscapeUtils.escapeJavaScript(String)

html

public String html(Object string)
Escapes the characters in a String using HTML entities.
Delegates the process to StringEscapeUtils.escapeHtml(String).

Parameters:
string - the string to escape, may be null
Returns:
a new escaped String, null if null string input
See Also:
StringEscapeUtils.escapeHtml(String)

url

public String url(Object string)
Escape the characters in a String to be suitable to use as an HTTP parameter value.
Uses UTF-8 as default character encoding.

Parameters:
string - the string to escape, may be null
Returns:
a new escaped String, null if null string input See java.net.URLEncoder#encode(String,String).
Since:
VelocityTools 1.3

xml

public String xml(Object string)
Escapes the characters in a String using XML entities.
Delegates the process to StringEscapeUtils.escapeXml(String).

Parameters:
string - the string to escape, may be null
Returns:
a new escaped String, null if null string input
See Also:
StringEscapeUtils.escapeXml(String)

sql

public String sql(Object string)
Escapes the characters in a String to be suitable to pass to an SQL query.
Delegates the process to StringEscapeUtils.escapeSql(String).

Parameters:
string - the string to escape, may be null
Returns:
a new String, escaped for SQL, null if null string input
See Also:
StringEscapeUtils.escapeSql(String)

unicode

public String unicode(Object code)
Converts the specified Unicode code point and/or escape sequence into the associated Unicode character. This allows numeric code points or String versions of the numeric code point to be correctly translated within a template. This is especially useful for those creating unicode from a reference value, or injecting a unicode character into a template with a version of Velocity prior to 1.6.

Parameters:
code - the code to be translated/escaped, may be null
Returns:
the unicode character for that code, null if input was null
See Also:
Character.toChars(int codePoint)

getDollar

public String getDollar()
Renders a dollar sign ($).

Returns:
a dollar sign ($).
See Also:
getD()

getD

public String getD()
Renders a dollar sign ($).

Returns:
a dollar sign ($).
See Also:
getDollar()

getHash

public String getHash()
Renders a hash (#).

Returns:
a hash (#).
See Also:
getH()

getH

public String getH()
Renders a hash (#).

Returns:
a hash (#).
See Also:
getHash()

getBackslash

public String getBackslash()
Renders a backslash (\).

Returns:
a backslash (\).
See Also:
getB()

getB

public String getB()
Renders a backslash (\).

Returns:
a backslash (\).
See Also:
getBackslash()

getQuote

public String getQuote()
Renders a double quotation mark (").

Returns:
a double quotation mark (").
See Also:
getQ()

getQ

public String getQ()
Renders a double quotation mark (").

Returns:
a double quotation mark (").
See Also:
getQuote()

getSingleQuote

public String getSingleQuote()
Renders a single quotation mark (').

Returns:
a single quotation mark (').
See Also:
getS()

getS

public String getS()
Renders a single quotation mark (').

Returns:
a single quotation mark (').
See Also:
getSingleQuote()

getNewline

public String getNewline()
Renders a new line character appropriate for the operating system ("\n" in java).

See Also:
getN()

getN

public String getN()
Renders a new line character appropriate for the operating system ("\n" in java).

See Also:
getNewline()

getExclamation

public String getExclamation()
Renders an exclamation mark (!).

Returns:
an exclamation mark (!).
See Also:
getE()

getE

public String getE()
Renders an exclamation mark (!).

Returns:
an exclamation mark (!).
See Also:
getExclamation()


Copyright © 2002-2011 The Apache Software Foundation. All Rights Reserved.