ExpressionNode

All Known Implementing Classes:

ExpressionBranch, ExpressionDirective, ExpressionFunction
```
public interface ExpressionNode
```
A single node in a compiled expression.

Author:

Matthew Tropiano

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`execute(ExpressionStack stack, ExpressionVariableContext context)`	Executes this node.
`boolean`	`isCollapsable()`	Checks if this node is collapsable.
`void`	`writeBytes(OutputStream out)`	Write value as bytes (for digest later).

- Method Detail
  - isCollapsable
```
boolean isCollapsable()
```
    Checks if this node is collapsable.
    
    Returns:
    
    true if so, false if not.
  - execute
```
boolean execute(ExpressionStack stack,
                ExpressionVariableContext context)
```
    Executes this node.
    
    Parameters:
    
    stack - the stack to use.
    
    context - the context for added variables.
    
    Returns:
    
    if false, stop expression calculation, else if true, continue.
  - writeBytes
```
void writeBytes(OutputStream out)
         throws IOException
```
    Write value as bytes (for digest later).
    
    Parameters:
    
    out - the output stream.
    
    Throws:
    
    IOException - on a write error.