DoubleKeyMap

java.lang.Object
- org.eclipse.persistence.internal.libraries.antlr.runtime.misc.DoubleKeyMap<Key1,Key2,Value>

```
public class DoubleKeyMap<Key1,Key2,Value>
extends java.lang.Object
```
Sometimes we need to map a key to a value but key is two pieces of data. This nested hash table saves creating a single key each time we access map; avoids mem creation.

Constructors
Constructor and Description
`DoubleKeyMap()`

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`java.util.Map<Key2,Value>`	`get(Key1 k1)`
`Value`	`get(Key1 k1, Key2 k2)`
`java.util.Set<Key1>`	`keySet()` get all primary keys
`java.util.Set<Key2>`	`keySet(Key1 k1)` get all secondary keys associated with a primary key
`Value`	`put(Key1 k1, Key2 k2, Value v)`
`java.util.Collection<Value>`	`values()`
`java.util.Collection<Value>`	`values(Key1 k1)` Get all values associated with primary key

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

public Value put(Key1 k1,
                 Key2 k2,
                 Value v)

public Value get(Key1 k1,
                 Key2 k2)

public java.util.Map<Key2,Value> get(Key1 k1)

public java.util.Collection<Value> values(Key1 k1)

Get all values associated with primary key

keySet
```
public java.util.Set<Key2> keySet(Key1 k1)
```
get all secondary keys associated with a primary key

public java.util.Collection<Value> values()

Class DoubleKeyMap<Key1,Key2,Value>