RuleChain

java.lang.Object
- net.sf.saxon.trans.rules.RuleChain

```
public class RuleChain
extends java.lang.Object
```
A chain of rules: actually in this incarnation just a pointer to the first rule in the chain, the others being linked together each to the next.

Field Summary

Fields
Modifier and Type Field Description

java.lang.Object optimizationData

Constructor Summary

Constructors
Constructor Description

RuleChain()
Create an empty rule chain

RuleChain(Rule head)
Create an rule chain with a give rule as the _head of the chain

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`getLength()`	Get the length of the rule chain
`boolean`	`hasOptimizationData()`	Ask whether the rule chain has optimization data, requiring allocation of a PreconditionMatcher when searching the rule chain
`Rule`	`head()`	Get the first rule in the chain, or null if the chain is empty
`void`	`setHead(Rule head)`	Set the first rule in the chain, or null if the chain is empty

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

- Field Detail
  - optimizationData
```
public java.lang.Object optimizationData
```
- Constructor Detail
  - RuleChain
```
public RuleChain()
```
    Create an empty rule chain
  - RuleChain
```
public RuleChain(Rule head)
```
    Create an rule chain with a give rule as the _head of the chain
    
    Parameters:
    
    head - the _head of a chain of rules
- Method Detail
  - head
```
public Rule head()
```
    Get the first rule in the chain, or null if the chain is empty
    
    Returns:
    
    the first rule in the chain, or null if empty
  - setHead
```
public void setHead(Rule head)
```
    Set the first rule in the chain, or null if the chain is empty
    
    Parameters:
    
    head - the first rule in the chain, or null if empty
  - getLength
```
public int getLength()
```
    Get the length of the rule chain
    
    Returns:
    
    the number of rules in the chain
  - hasOptimizationData
```
public boolean hasOptimizationData()
```
    Ask whether the rule chain has optimization data, requiring allocation of a PreconditionMatcher when searching the rule chain
    
    Returns:
    
    true if there is optimization data associated with the rule chain.