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Java™ Platform Standard Ed. 6 |
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public interface ScriptEngineFactory
ScriptEngineFactory is used to describe and instantiate
ScriptEngines.
Each class implementing ScriptEngine has a corresponding factory
that exposes metadata describing the engine class.
The ScriptEngineManager
uses the service provider mechanism described in the Jar File Specification to obtain
instances of all ScriptEngineFactories available in
the current ClassLoader.
| Method Summary | |
|---|---|
String |
getEngineName()
Returns the full name of the ScriptEngine. |
String |
getEngineVersion()
Returns the version of the ScriptEngine. |
List<String> |
getExtensions()
Returns an immutable list of filename extensions, which generally identify scripts written in the language supported by this ScriptEngine. |
String |
getLanguageName()
Returns the name of the scripting langauge supported by this ScriptEngine. |
String |
getLanguageVersion()
Returns the version of the scripting language supported by this ScriptEngine. |
String |
getMethodCallSyntax(String obj,
String m,
String... args)
Returns a String which can be used to invoke a method of a Java object using the syntax of the supported scripting language. |
List<String> |
getMimeTypes()
Returns an immutable list of mimetypes, associated with scripts that can be executed by the engine. |
List<String> |
getNames()
Returns an immutable list of short names for the ScriptEngine, which may be used to
identify the ScriptEngine by the ScriptEngineManager. |
String |
getOutputStatement(String toDisplay)
Returns a String that can be used as a statement to display the specified String using the syntax of the supported scripting language. |
Object |
getParameter(String key)
Returns the value of an attribute whose meaning may be implementation-specific. |
String |
getProgram(String... statements)
Returns A valid scripting language executable progam with given statements. |
ScriptEngine |
getScriptEngine()
Returns an instance of the ScriptEngine associated with this
ScriptEngineFactory. |
| Method Detail |
|---|
String getEngineName()
ScriptEngine. For
instance an implementation based on the Mozilla Rhino Javascript engine
might return Rhino Mozilla Javascript Engine.
String getEngineVersion()
ScriptEngine.
ScriptEngine implementation version.List<String> getExtensions()
ScriptEngine.
The array is used by the ScriptEngineManager to implement its
getEngineByExtension method.
List<String> getMimeTypes()
ScriptEngineManager class to implement its
getEngineByMimetype method.
List<String> getNames()
ScriptEngine, which may be used to
identify the ScriptEngine by the ScriptEngineManager.
For instance, an implementation based on the Mozilla Rhino Javascript engine might
return list containing {"javascript", "rhino"}.
String getLanguageName()
ScriptEngine.
String getLanguageVersion()
ScriptEngine.
Object getParameter(String key)
The values for these keys are the Strings returned by getEngineName,
getEngineVersion, getName, getLanguageName and
getLanguageVersion respectively.
A reserved key, THREADING, whose value describes the behavior of the engine
with respect to concurrent execution of scripts and maintenance of state is also defined.
These values for the THREADING key are:
null - The engine implementation is not thread safe, and cannot
be used to execute scripts concurrently on multiple threads.
"MULTITHREADED" - The engine implementation is internally
thread-safe and scripts may execute concurrently although effects of script execution
on one thread may be visible to scripts on other threads.
"THREAD-ISOLATED" - The implementation satisfies the requirements
of "MULTITHREADED", and also, the engine maintains independent values
for symbols in scripts executing on different threads.
"STATELESS" - The implementation satisfies the requirements of
"THREAD-ISOLATED". In addition, script executions do not alter the
mappings in the Bindings which is the engine scope of the
ScriptEngine. In particular, the keys in the Bindings
and their associated values are the same before and after the execution of the script.
key - The name of the parameter
null if no
value is assigned to the key.
String getMethodCallSyntax(String obj,
String m,
String... args)
public String getMethodCallSyntax(String obj,
String m, String... args) {
String ret = obj;
ret += "." + m + "(";
for (int i = 0; i < args.length; i++) {
ret += args[i];
if (i == args.length - 1) {
ret += ")";
} else {
ret += ",";
}
}
return ret;
}
obj - The name representing the object whose method is to be invoked. The
name is the one used to create bindings using the put method of
ScriptEngine, the put method of an ENGINE_SCOPE
Bindings,or the setAttribute method
of ScriptContext. The identifier used in scripts may be a decorated form of the
specified one.m - The name of the method to invoke.args - names of the arguments in the method call.
String getOutputStatement(String toDisplay)
public String getOutputStatement(String toDisplay) {
return "print(" + toDisplay + ")";
}
toDisplay - The String to be displayed by the returned statement.
String getProgram(String... statements)
public String getProgram(String... statements) {
$retval = "<?\n";
int len = statements.length;
for (int i = 0; i < len; i++) {
$retval += statements[i] + ";\n";
}
$retval += "?>";
}
statements - The statements to be executed. May be return values of
calls to the getMethodCallSyntax and getOutputStatement methods.
ScriptEngine getScriptEngine()
ScriptEngine associated with this
ScriptEngineFactory. A new ScriptEngine is generally
returned, but implementations may pool, share or reuse engines.
ScriptEngine instance.
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Java™ Platform Standard Ed. 6 |
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