LexicalFrame

java.lang.Object
- org.apache.commons.jexl3.internal.LexicalScope
- - org.apache.commons.jexl3.internal.LexicalFrame

```
public class LexicalFrame
extends LexicalScope
```
The set of valued symbols defined in a lexical frame.
The functional scope determines the symbol identifiers. Since the frame contains values of all symbols in the functional scope, the lexical frame preserves values of symbols reused for local definition.

Field Summary

Fields
Modifier and Type	Field	Description
`private Frame`	`frame`	The script frame.
`protected LexicalFrame`	`previous`	Previous frame.
`private java.util.Deque<java.lang.Object>`	`stack`	The stack of values in the lexical frame.

Fields inherited from class org.apache.commons.jexl3.internal.LexicalScope
BITS_PER_LONG, BITS_PER_SYMBOL, count, moreSymbols, SYMBOL_MASK, SYMBOL_SHIFT, symbols

Constructor Summary

Constructors
Constructor Description

LexicalFrame(Frame scriptf, LexicalFrame outerf)
Lexical frame ctor.

LexicalFrame(LexicalFrame src)
Copy ctor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`LexicalFrame`	`defineArgs()`	Define the arguments.
`boolean`	`defineSymbol(int symbol, boolean capture)`	Defines a symbol.
`LexicalFrame`	`pop()`	Pops back values and lexical frame.

Methods inherited from class org.apache.commons.jexl3.internal.LexicalScope
addConstant, addSymbol, clearSymbols, getSymbolCount, hasSymbol, isConstant

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

- Field Detail
  - frame
```
private final Frame frame
```
    The script frame.
  - previous
```
protected final LexicalFrame previous
```
    Previous frame.
  - stack
```
private java.util.Deque<java.lang.Object> stack
```
    The stack of values in the lexical frame.
    [symbol identifier, value] are stacked in pairs
- Constructor Detail
  - LexicalFrame
```
public LexicalFrame(Frame scriptf,
                    LexicalFrame outerf)
```
    Lexical frame ctor.
    
    Parameters:
    
    scriptf - the script frame
    
    outerf - the previous lexical frame
  - LexicalFrame
```
public LexicalFrame(LexicalFrame src)
```
    Copy ctor.
    
    Parameters:
    
    src - the frame to copy
- Method Detail
  - defineArgs
```
public LexicalFrame defineArgs()
```
    Define the arguments.
    
    Returns:
    
    this frame
  - defineSymbol
```
public boolean defineSymbol(int symbol,
                            boolean capture)
```
    Defines a symbol.
    
    Parameters:
    
    symbol - the symbol to define
    
    capture - whether this redefines a captured symbol
    
    Returns:
    
    true if the symbol is defined, false otherwise
  - pop
```
public LexicalFrame pop()
```
    Pops back values and lexical frame.
    
    Returns:
    
    the previous frame