Class SimpleBindings

java.lang.Object
- javax.script.SimpleBindings

All Implemented Interfaces:: Map<String,Object>, Bindings

public class SimpleBindings
extends Object
implements Bindings

A simple implementation of Bindings backed by a HashMap or some other specified Map.

Since:: 1.6

Nested Class Summary

Nested classes/interfaces declared in interface java.util.Map

Map.Entry<K,V>

Constructor Summary

Constructors
Constructor	Description
`SimpleBindings()`	Default constructor uses a `HashMap`.
`SimpleBindings(Map<String,Object> m)`	Constructor uses an existing `Map` to store the values.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`containsKey(Object key)`	Returns `true` if this map contains a mapping for the specified key.
`Object`	`get(Object key)`	Returns the value to which this map maps the specified key.
`Object`	`put(String name, Object value)`	Sets the specified key/value in the underlying `map` field.
`void`	`putAll(Map<? extends String,? extends Object> toMerge)`	`putAll` is implemented using `Map.putAll`.
`Object`	`remove(Object key)`	Removes the mapping for this key from this map if it is present (optional operation).

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods declared in interface java.util.Map

clear, compute, computeIfAbsent, computeIfPresent, containsValue, entrySet, equals, forEach, getOrDefault, hashCode, isEmpty, keySet, merge, putIfAbsent, remove, replace, replace, replaceAll, size, values

Constructor Detail

SimpleBindings

public SimpleBindings(Map<String,Object> m)

Constructor uses an existing Map to store the values.

Parameters:: m - The Map backing this SimpleBindings.
Throws:: NullPointerException - if m is null

SimpleBindings

public SimpleBindings()

Default constructor uses a HashMap.

Method Detail

put

public Object put(String name,
                  Object value)

Sets the specified key/value in the underlying map field.

Specified by:: put in interface Bindings
Specified by:: put in interface Map<String,Object>
Parameters:: name - Name of value; value - Value to set.
Returns:: Previous value for the specified key. Returns null if key was previously unset.
Throws:: NullPointerException - if the name is null.; IllegalArgumentException - if the name is empty.

putAll

public void putAll(Map<? extends String,? extends Object> toMerge)

putAll is implemented using Map.putAll.

Specified by:: putAll in interface Bindings
Specified by:: putAll in interface Map<String,Object>
Parameters:: toMerge - The Map of values to add.
Throws:: NullPointerException - if toMerge map is null or if some key in the map is null.; IllegalArgumentException - if some key in the map is an empty String.

containsKey

public boolean containsKey(Object key)

Returns true if this map contains a mapping for the specified key. More formally, returns true if and only if this map contains a mapping for a key k such that (key==null ? k==null : key.equals(k)). (There can be at most one such mapping.)

Specified by:: containsKey in interface Bindings
Specified by:: containsKey in interface Map<String,Object>
Parameters:: key - key whose presence in this map is to be tested.
Returns:: true if this map contains a mapping for the specified key.
Throws:: NullPointerException - if key is null; ClassCastException - if key is not String; IllegalArgumentException - if key is empty String

get

public Object get(Object key)

Returns the value to which this map maps the specified key. Returns null if the map contains no mapping for this key. A return value of null does not necessarily indicate that the map contains no mapping for the key; it's also possible that the map explicitly maps the key to null. The containsKey operation may be used to distinguish these two cases.

More formally, if this map contains a mapping from a key k to a value v such that (key==null ? k==null : key.equals(k)), then this method returns v; otherwise it returns null. (There can be at most one such mapping.)

Specified by:: get in interface Bindings
Specified by:: get in interface Map<String,Object>
Parameters:: key - key whose associated value is to be returned.
Returns:: the value to which this map maps the specified key, or null if the map contains no mapping for this key.
Throws:: NullPointerException - if key is null; ClassCastException - if key is not String; IllegalArgumentException - if key is empty String

remove

public Object remove(Object key)

Removes the mapping for this key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that (key==null ? k==null : key.equals(k)), that mapping is removed. (The map can contain at most one such mapping.)

Returns the value to which the map previously associated the key, or null if the map contained no mapping for this key. (A null return can also indicate that the map previously associated null with the specified key if the implementation supports null values.) The map will not contain a mapping for the specified key once the call returns.

Specified by:: remove in interface Bindings
Specified by:: remove in interface Map<String,Object>
Parameters:: key - key whose mapping is to be removed from the map.
Returns:: previous value associated with specified key, or null if there was no mapping for key.
Throws:: NullPointerException - if key is null; ClassCastException - if key is not String; IllegalArgumentException - if key is empty String