CustomSet

java.lang.Object
- net.sf.saxon.expr.sort.CustomSet<T>

Type Parameters:

T - The type of the entries in the set
```
public class CustomSet<T>
extends java.lang.Object
```
A mutable set implementation using a custom equality matcher, to avoid having to wrap each entry in a wrapper object to achieve customised equality testing.
Note: this doesn't implement java.util.Set<T>. This is to save the effort of implementing methods like size() and iterator() that aren't required for our use cases. These methods could easily be added without changing the basic design.

Constructor Summary

Constructors
Constructor Description

CustomSet(EqualityMatcher<T> matcher)
Create an empty set using the supplied equality matcher

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`add(T value)`	Add a value to the set
`boolean`	`contains(T value)`	Ask if a value exists in the set

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

- Constructor Detail
  - CustomSet
```
public CustomSet(EqualityMatcher<T> matcher)
```
    Create an empty set using the supplied equality matcher
    
    Parameters:
    
    matcher - the function used to compare items for equality
- Method Detail
  - add
```
public boolean add(T value)
```
    Add a value to the set
    
    Parameters:
    
    value - the value to be added.
    
    Returns:
    
    true if the value is newly added, that is, if it was not already present
  - contains
```
public boolean contains(T value)
```
    Ask if a value exists in the set
    
    Parameters:
    
    value - the requested value
    
    Returns:
    
    true if it exists