JavaMacro

java.lang.Object
- weka.core.expressionlanguage.common.JavaMacro

All Implemented Interfaces:

Macro, MacroDeclarations
```
public class JavaMacro
extends java.lang.Object
implements MacroDeclarations, Macro
```
A macro declarations that exposes the java macro to a program.
The java macro can be used as follows
java(class, signature, arguments)
Where class is the name of class, signature is the signature of the function and arguments is a list of arguments passed to the java function.
The signature follows the pattern:
type name '(' [ type [ ',' type ]* ] ')'
where type is one of 'boolean', 'double' or 'String' and name must be a valid java identifier.
Examples:
- java('java.lang.Math', 'double sqrt(double)', 4.0)
- java('java.lang.String', 'String valueOf(double)', 2^30)
Version:

$Revision: 1000 $

Author:

Benjamin Weber ( benweber at student dot ethz dot ch )

Constructor Summary

Constructors
Constructor Description

JavaMacro()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Node`	`evaluate(Node... nodes)`	Evaluates the java macro on the given arguments
`Macro`	`getMacro(java.lang.String name)`	Tries to fetch the macro
`boolean`	`hasMacro(java.lang.String name)`	Whether the macro declarations contains the macro

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - JavaMacro
```
public JavaMacro()
```
- Method Detail
  - evaluate
```
public Node evaluate(Node... nodes)
              throws SemanticException
```
    Evaluates the java macro on the given arguments
    
    Specified by:
    
    evaluate in interface Macro
    
    Parameters:
    
    nodes - the arguments to the java macro
    
    Returns:
    
    an AST node returned by the macro
    
    Throws:
    
    SemanticException
  - hasMacro
```
public boolean hasMacro(java.lang.String name)
```
    Whether the macro declarations contains the macro
    
    Specified by:
    
    hasMacro in interface MacroDeclarations
    
    Parameters:
    
    name - name of the macro
    
    Returns:
    
    whether the macro is declared
  - getMacro
```
public Macro getMacro(java.lang.String name)
```
    Description copied from interface: MacroDeclarations
    
    Tries to fetch the macro
    Before a macro is fetched it shold be checked whether it is declared through MacroDeclarations.hasMacro(String)
    
    Specified by:
    
    getMacro in interface MacroDeclarations
    
    Returns: