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## ix.util.match
Class MatchEnv

    java.lang.Object
      java.util.AbstractMap<K,V>
          java.util.HashMap
              ix.util.match.MatchEnv

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, java.util.Map

    public class MatchEnv

extends java.util.HashMap

A root class for objects that contain the bindings that result from pattern-matching.

MatchEnvs are not used automatically in MatchTable-based matching; they are merely available in case they are useful. For instance, a MatchCase tryMatch method might construct a MatchEnv while matching and return it if the match succeeds. It would then be passed to the MatchCase's ifSelected method by the MatchTable.

See Also:
  `MatchTable`, `MatchCase`, Serialized Form

Constructor Summary
`MatchEnv()`
`MatchEnv(java.util.Map t)`

Method Summary
`java.lang.Object` | `checkedPut(java.lang.Object key, java.lang.Object value)`
`java.util.Map` | `getVariableBindings(java.lang.Class variableClass)` Returns a Map containing any variable-to-value pairs specified by this MatchEnv for instances of the specified variable class.
`java.lang.Object` | `instantiate(java.lang.Object obj, Function1 ifUnbound)`
`java.lang.Object` | `instantiateTree(java.lang.Object tree, Function1 ifUnbound)`

Methods inherited from class java.util.HashMap
`clear, clone, containsKey, containsValue, entrySet, get, isEmpty, keySet, put, putAll, remove, size, values`

Methods inherited from class java.util.AbstractMap
`equals, hashCode, toString`

Methods inherited from class java.lang.Object
`finalize, getClass, notify, notifyAll, wait, wait, wait`

Methods inherited from interface java.util.Map
`equals, hashCode`

Constructor Detail

### MatchEnv

    public MatchEnv()

### MatchEnv

    public MatchEnv(java.util.Map t)

Method Detail

### checkedPut

    public java.lang.Object checkedPut(java.lang.Object key,
                                       java.lang.Object value)

### getVariableBindings

    public java.util.Map getVariableBindings(java.lang.Class variableClass)

  Returns a Map containing any variable-to-value pairs specified by this MatchEnv for instances of the specified variable class.

  Returns:
    a nonEmpty Map if any variable bindings were specified, otherwise null.

### instantiate

    public java.lang.Object instantiate(java.lang.Object obj,
                                        Function1 ifUnbound)

### instantiateTree

    public java.lang.Object instantiateTree(java.lang.Object tree,
                                            Function1 ifUnbound)

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