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java.lang.Objectorg.apache.commons.jexl.ScriptFactory
public class ScriptFactory
Creates Script
s. To create a JEXL Script, pass
valid JEXL syntax to the static createScript() method:
String jexl = "y = x * 12 + 44; y = y * 4;"; Script script = ScriptFactory.createScript( jexl );
When an Script
is created, the JEXL syntax is
parsed and verified.
Field Summary | |
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protected static ScriptFactory |
factory
ScriptFactory is a singleton and this is the private instance fufilling that pattern. |
protected static org.apache.commons.logging.Log |
log
The Log to which all ScriptFactory messages will be logged. |
protected static Parser |
parser
The singleton ScriptFactory also holds a single instance of Parser . |
Constructor Summary | |
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private |
ScriptFactory()
Private constructor, the single instance is always obtained with a call to getInstance(). |
Method Summary | |
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private java.lang.String |
cleanScript(java.lang.String script)
|
protected Script |
createNewScript(java.lang.String scriptText)
Creates a new Script based on the string. |
static Script |
createScript(java.io.File scriptFile)
Creates a Script from a File containing valid JEXL syntax. |
static Script |
createScript(java.lang.String scriptText)
Creates a Script from a String containing valid JEXL syntax. |
static Script |
createScript(java.net.URL scriptUrl)
Creates a Script from a URL containing valid JEXL syntax. |
protected static ScriptFactory |
getInstance()
Returns the single instance of ScriptFactory. |
private static java.lang.String |
readerToString(java.io.BufferedReader reader)
Read a buffered reader into a StringBuffer and return a String with the contents of the reader. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected static org.apache.commons.logging.Log log
protected static Parser parser
Parser
. When parsing expressions, ScriptFactory
synchronizes on Parser.
protected static ScriptFactory factory
Constructor Detail |
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private ScriptFactory()
Method Detail |
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protected static ScriptFactory getInstance()
public static Script createScript(java.lang.String scriptText) throws java.lang.Exception
scriptText
- A String containing valid JEXL syntax
Script
which can be executed with a
JexlContext
.
java.lang.Exception
- An exception can be thrown if there is a
problem parsing the script.public static Script createScript(java.io.File scriptFile) throws java.lang.Exception
File
containing valid JEXL syntax.
This method parses the script and validates the syntax.
scriptFile
- A File
containing valid JEXL syntax.
Must not be null. Must be a readable file.
Script
which can be executed with a
JexlContext
.
java.lang.Exception
- An exception can be thrown if there is a problem
parsing the script.public static Script createScript(java.net.URL scriptUrl) throws java.lang.Exception
URL
containing valid JEXL syntax.
This method parses the script and validates the syntax.
scriptUrl
- A URL
containing valid JEXL syntax.
Must not be null. Must be a readable file.
Script
which can be executed with a
JexlContext
.
java.lang.Exception
- An exception can be thrown if there is a problem
parsing the script.protected Script createNewScript(java.lang.String scriptText) throws java.lang.Exception
scriptText
- valid Jexl script
java.lang.Exception
- for a variety of reasons - mostly malformed scriptsprivate java.lang.String cleanScript(java.lang.String script)
script
- to clean
private static java.lang.String readerToString(java.io.BufferedReader reader) throws java.io.IOException
reader
- to be read.
java.io.IOException
- on any error reading the reader.
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