Examples of org.luaj.vm2.LuaValue

org.luaj.vm2.LuaValue
Base class for all concrete lua type values.
Establishes base implementations for all the operations on lua types. This allows Java clients to deal essentially with one type for all Java values, namely {@link LuaValue}.
Constructors are provided as static methods for common Java types, such as {@link LuaValue#valueOf(int)} or {@link LuaValue#valueOf(String)} to allow for instance pooling.
Constants are defined for the lua values {@link #NIL}, {@link #TRUE}, and {@link #FALSE}. A constant {@link #NONE} is defined which is a {@link Varargs} list having no values.
Operations are performed on values directly via their Java methods. For example, the following code divides two numbers:
```
  {@code LuaValue a = LuaValue.valueOf( 5 ); LuaValue b = LuaValue.valueOf( 4 ); LuaValue c = a.div(b);} 
```
Note that in this example, c will be a {@link LuaDouble}, but would be a {@link LuaInteger} if the value of a were changed to 8, say. In general the value of c in practice will vary depending on both the types and values of a and b as well as any metatable/metatag processing that occurs.
Field access and function calls are similar, with common overloads to simplify Java usage:
```
  {@code LuaValue globals = JsePlatform.standardGlobals(); LuaValue sqrt = globals.get("math").get("sqrt"); LuaValue print = globals.get("print"); LuaValue d = sqrt.call( a ); print.call( LuaValue.valueOf("sqrt(5):"), a );} 
```
To supply variable arguments or get multiple return values, use {@link invoke(Varargs)} or {@link invokemethod(LuaValue, Varargs)} methods:
```
  {@code LuaValue modf = globals.get("math").get("modf"); Varargs r = modf.invoke( d ); print.call( r.arg(1), r.arg(2) );} 
```
To load and run a script, {@link LoadState} is used:
```
  {@code LoadState.load( new FileInputStream("main.lua"), "main.lua", globals ).call();} 
```
although {@code require} could also be used:
```
  {@code globals.get("require").call(LuaValue.valueOf("main"));} 
```
For this to work the file must be in the current directory, or in the class path, dependening on the platform. See {@link JsePlatform} and {@link JmePlatform} for details.
In general a {@link LuaError} may be thrown on any operation when the types supplied to any operation are illegal from a lua perspective. Examples could be attempting to concatenate a NIL value, or attempting arithmetic on values that are not number.
There are several methods for preinitializing tables, such as:
- {@link #listOf(LuaValue[])} for unnamed elements
- {@link #tableOf(LuaValue[])} for named elements
- {@link #tableOf(LuaValue[],LuaValue[],Varargs)} for mixtures
Predefined constants exist for the standard lua type constants {@link TNIL}, {@link TBOOLEAN}, {@link TLIGHTUSERDATA}, {@link TNUMBER}, {@link TSTRING}, {@link TTABLE}, {@link TFUNCTION}, {@link TUSERDATA}, {@link TTHREAD}, and extended lua type constants {@link TINT}, {@link TNONE}, {@link TVALUE}
Predefined constants exist for all strings used as metatags: {@link INDEX}, {@link NEWINDEX}, {@link CALL}, {@link MODE}, {@link METATABLE}, {@link ADD}, {@link SUB}, {@link DIV}, {@link MUL}, {@link POW}, {@link MOD}, {@link UNM}, {@link LEN}, {@link EQ}, {@link LT}, {@link LE}, {@link TOSTRING}, and {@link CONCAT}. @see JsePlatform @see JmePlatform @see LoadState @see Varargs

    public Varargs invoke(Varargs args) {
      LuaList list = new LuaList(instance, new ArrayList<LuaValue>());
      
      if (args.istable(2)) {
        LuaTable table = args.checktable(2);
        LuaValue k = LuaValue.NIL;
        
        while (true) {
           Varargs n = table.next(k);
           
           if ((k = n.arg1()).isnil())
             break;


           LuaValue v = n.arg(2);
           list.append(v);
         }
      }        
      return LuaValue.varargsOf(new LuaValue[] {list});
    }

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    public Varargs invoke(Varargs args) {
      LuaMap map = new LuaMap(instance, new HashMap<LuaValue,LuaValue>());
      
      if (args.istable(2)) {
        LuaTable table = args.checktable(2);
        LuaValue k = LuaValue.NIL;
        
        while (true) {
           Varargs n = table.next(k);
           
           if ((k = n.arg1()).isnil())
             break;


           LuaValue v = n.arg(2);
           map.put(k, v);
         }
      }        
      return LuaValue.varargsOf(new LuaValue[] {map});
    }

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      readBytes(nameSize);
      String name = Buffer.utf8ToString(dataBuffer, 0, nameSize);
  
      int particleBytesSize = (int) (opSize - (4 + nameSize));
      readBytes(particleBytesSize);
      LuaValue aggregateValue = instance.getValue(particleType, dataBuffer, 0, particleBytesSize);
            
      if (! name.equals("SUCCESS")) {
        throw new AerospikeException("Query aggregate expected bin name SUCCESS.  Received " + name);
      }

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        else {
          throw new AerospikeException(ResultCode.QUERY_GENERIC, "Query aggregate expected bin name SUCCESS.  Received " + name);
        }
      }
      
      LuaValue aggregateValue = instance.getLuaValue(particleType, dataBuffer, 0, particleBytesSize);
                  
      if (! valid) {
        throw new AerospikeException.QueryTerminated();
      }

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  public LuaMap getLuaMap(Map<?,?> map) {
    Map<LuaValue,LuaValue> luaMap = new HashMap<LuaValue,LuaValue>(map.size());
    
    for (Map.Entry<?,?> entry : map.entrySet()) {
      LuaValue key = getLuaValue(entry.getKey());
      LuaValue value = getLuaValue(entry.getValue());
      luaMap.put(key, value);
    }
    return new LuaMap(this, luaMap);    
  }

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    public Varargs invoke(Varargs args) {
      LuaList list = new LuaList(instance, new ArrayList<LuaValue>());
      
      if (args.istable(2)) {
        LuaTable table = args.checktable(2);
        LuaValue k = LuaValue.NIL;
        
        while (true) {
           Varargs n = table.next(k);
           
           if ((k = n.arg1()).isnil())
             break;


           LuaValue v = n.arg(2);
           list.append(v);
         }
      }        
      return LuaValue.varargsOf(new LuaValue[] {list});
    }

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    public Varargs invoke(Varargs args) {
      LuaMap map = new LuaMap(instance, new HashMap<LuaValue,LuaValue>());
      
      if (args.istable(2)) {
        LuaTable table = args.checktable(2);
        LuaValue k = LuaValue.NIL;
        
        while (true) {
           Varargs n = table.next(k);
           
           if ((k = n.arg1()).isnil())
             break;


           LuaValue v = n.arg(2);
           map.put(k, v);
         }
      }        
      return LuaValue.varargsOf(new LuaValue[] {map});
    }

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    _G = JsePlatform.standardGlobals();
  }
  
  public void testJavaIntToLuaInt() {
    Integer i = Integer.valueOf(777);
    LuaValue v = CoerceJavaToLua.coerce(i);
    assertEquals( LuaInteger.class, v.getClass() );
    assertEquals( 777, v.toint() );
  }

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    assertEquals( new Integer(777), o );
  }
  
  public void testJavaStringToLuaString() {
    String s = new String("777");
    LuaValue v = CoerceJavaToLua.coerce(s);
    assertEquals( LuaString.class, v.getClass() );
    assertEquals( "777", v.toString() );
  }

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    assertEquals( "777", o );
  }
  
  public void testJavaIntArrayToLuaTable() {
    int[] i = { 222, 333 };
    LuaValue v = CoerceJavaToLua.coerce(i);
    assertEquals( JavaArray.class, v.getClass() );
    assertEquals( LuaInteger.valueOf(222), v.get(ONE) );
    assertEquals( LuaInteger.valueOf(333), v.get(TWO) );
    assertEquals( TWO, v.get(LENGTH));
    assertEquals( LuaValue.NIL, v.get(THREE) );
    assertEquals( LuaValue.NIL, v.get(ZERO) );
    v.set(ONE, LuaInteger.valueOf(444));
    v.set(TWO, LuaInteger.valueOf(555));
    assertEquals( 444, i[0] );
    assertEquals( 555, i[1] );
    assertEquals( LuaInteger.valueOf(444), v.get(ONE) );
    assertEquals( LuaInteger.valueOf(555), v.get(TWO) );
    try {
      v.set(ZERO, LuaInteger.valueOf(777));
      fail( "array bound exception not thrown" );
    } catch ( LuaError lee ) {
      // expected
    }
    try {
      v.set(THREE, LuaInteger.valueOf(777));
      fail( "array bound exception not thrown" );
    } catch ( LuaError lee ) {
      // expected
    }
  }

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