CustomMap

java.lang.Object
- net.sf.saxon.expr.sort.CustomMap<K,V>

```
public class CustomMap<K,V>
extends java.lang.Object
```
A map 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 Map<K, V> 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

CustomMap(EqualityMatcher<K> matcher)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`containsKey(K key)`	Ask if a key exists in the set of keys
`V`	`get(K key)`	Get the value associated with a given key, or null if absemt
`java.util.List<K>`	`keys()`	List all the keys.
`V`	`put(K key, V value)`	Add an entry to the map
`java.util.List<V>`	`values()`	List all the values.

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

- Constructor Detail
  - CustomMap
```
public CustomMap(EqualityMatcher<K> matcher)
```
- Method Detail
  - put
```
public V put(K key,
             V value)
```
    Add an entry to the map
    
    Parameters:
    
    key - the new key
    
    value - the value to be added.
    
    Returns:
    
    the previous value for the key if there was one, or null otherwise
  - get
```
public V get(K key)
```
    Get the value associated with a given key, or null if absemt
    
    Parameters:
    
    key - the new key
    
    Returns:
    
    the value for the key if there is one, or null otherwise
  - containsKey
```
public boolean containsKey(K key)
```
    Ask if a key exists in the set of keys
    
    Parameters:
    
    key - the requested key
    
    Returns:
    
    true if it exists
  - keys
```
public java.util.List<K> keys()
```
    List all the keys.
    
    Returns:
    
    a list of all the keys
  - values
```
public java.util.List<V> values()
```
    List all the values.
    
    Returns:
    
    a list of all the values