StrConcat (Apache Jena)

java.lang.Object
- org.apache.jena.reasoner.rulesys.builtins.BaseBuiltin
- - org.apache.jena.reasoner.rulesys.builtins.StrConcat

All Implemented Interfaces:

Builtin

Direct Known Subclasses:

UriConcat
```
public class StrConcat
extends BaseBuiltin
```
Builtin which concatenates a set of strings. It binds the last argument to a plain literal which is the concatenation of all the preceeding arguments. For a literal argument we use its lexical form, for a URI argument its URI, for a bNode argument its internal ID.

Field Summary
- Fields inherited from class org.apache.jena.reasoner.rulesys.builtins.BaseBuiltin
  BASE_URI

Constructor Summary

Constructors
Constructor Description

StrConcat()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`bodyCall(Node[] args, int length, RuleContext context)`	This method is invoked when the builtin is called in a rule body.
`int`	`getArgLength()`	Return the expected number of arguments for this functor or 0 if the number is flexible.
`java.lang.String`	`getName()`	Return a name for this builtin, normally this will be the name of the functor that will be used to invoke it.

Methods inherited from class org.apache.jena.reasoner.rulesys.builtins.BaseBuiltin
checkArgs, getArg, getURI, headAction, isMonotonic, isSafe

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

- Constructor Detail
  - StrConcat
```
public StrConcat()
```
- Method Detail
  - getName
```
public java.lang.String getName()
```
    Return a name for this builtin, normally this will be the name of the functor that will be used to invoke it.
  - getArgLength
```
public int getArgLength()
```
    Return the expected number of arguments for this functor or 0 if the number is flexible.
    
    Specified by:
    
    getArgLength in interface Builtin
    
    Overrides:
    
    getArgLength in class BaseBuiltin
  - bodyCall
```
public boolean bodyCall(Node[] args,
                        int length,
                        RuleContext context)
```
    This method is invoked when the builtin is called in a rule body.
    
    Specified by:
    
    bodyCall in interface Builtin
    
    Overrides:
    
    bodyCall in class BaseBuiltin
    
    Parameters:
    
    args - the array of argument values for the builtin, this is an array of Nodes, some of which may be Node_RuleVariables.
    
    length - the length of the argument list, may be less than the length of the args array for some rule engines
    
    context - an execution context giving access to other relevant data
    
    Returns:
    
    return true if the buildin predicate is deemed to have succeeded in the current environment