ExpressionNode (document 7.286.18 API)

All Known Implementing Classes:

ArithmeticNode, AttributeNode, ComparisonNode, DocumentNode, EmbracedNode, IdNode, LiteralNode, LogicNode, NegationNode, NowNode, VariableNode
```
public interface ExpressionNode
```
This is the interface of all expression nodes. It declares the methods requires by all expression nodes to maintain a working document selector language.

Author:

Simon Thoresen Hult

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`accept(Visitor visitor)`	Perform visitation of this node.
`java.lang.Object`	`evaluate(Context doc)`	Evaluate the content of this node based on document object, and return that value.
`BucketSet`	`getBucketSet(BucketIdFactory factory)`	Returns the set of bucket ids covered by this node.

- Method Detail
  - evaluate
```
java.lang.Object evaluate(Context doc)
```
    Evaluate the content of this node based on document object, and return that value.
    
    Parameters:
    
    doc - the document to evaluate over.
    
    Returns:
    
    the value of this.
  - getBucketSet
```
BucketSet getBucketSet(BucketIdFactory factory)
```
    Returns the set of bucket ids covered by this node.
    
    Parameters:
    
    factory - the factory used by the current application.
  - accept
```
void accept(Visitor visitor)
```
    Perform visitation of this node.
    
    Parameters:
    
    visitor - the visitor that wishes to visit the node.