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java.lang.Object org.apache.lucene.expressions.js.JavascriptCompiler
public class JavascriptCompiler
An expression compiler for javascript expressions.
Example:
Expression foo = JavascriptCompiler.compile("((0.3*popularity)/10.0)+(0.7*score)");
See the package documentation
for
the supported syntax and default functions.
You can compile with an alternate set of functions via compile(String, Map, ClassLoader)
.
For example:
Map<String,Method> functions = new HashMap<String,Method>(); // add all the default functions functions.putAll(JavascriptCompiler.DEFAULT_FUNCTIONS); // add cbrt() functions.put("cbrt", Math.class.getMethod("cbrt", double.class)); // call compile with customized function map Expression foo = JavascriptCompiler.compile("cbrt(score)+ln(popularity)", functions, getClass().getClassLoader());
Field Summary | |
---|---|
static Map<String,Method> |
DEFAULT_FUNCTIONS
The default set of functions available to expressions. |
Method Summary | |
---|---|
static Expression |
compile(String sourceText)
Compiles the given expression. |
static Expression |
compile(String sourceText,
Map<String,Method> functions,
ClassLoader parent)
Compiles the given expression with the supplied custom functions. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
public static final Map<String,Method> DEFAULT_FUNCTIONS
See the package documentation
for a list.
Method Detail |
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public static Expression compile(String sourceText) throws ParseException
sourceText
- The expression to compile
ParseException
- on failure to compilepublic static Expression compile(String sourceText, Map<String,Method> functions, ClassLoader parent) throws ParseException
Functions must be public static
, return double
and
can take from zero to 256 double
parameters.
sourceText
- The expression to compilefunctions
- map of String names to functionsparent
- a ClassLoader
that should be used as the parent of the loaded class.
It must contain all classes referred to by the given functions
.
ParseException
- on failure to compile
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