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javax.script
Class SimpleBindings

java.lang.Object
  extended by 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 inherited from interface java.util.Map
Map.Entry<K,V>
 
Constructor Summary
SimpleBindings()
          Default constructor uses a HashMap.
SimpleBindings(Map<String,Object> m)
          Constructor uses an existing Map to store the values.
 
Method Summary
 void clear()
          Removes all of the mappings from this map (optional operation).
 boolean containsKey(Object key)
          Returns true if this map contains a mapping for the specified key.
 boolean containsValue(Object value)
          Returns true if this map maps one or more keys to the specified value.
 Set<Map.Entry<String,Object>> entrySet()
          Returns a Set view of the mappings contained in this map.
 Object get(Object key)
          Returns the value to which this map maps the specified key.
 boolean isEmpty()
          Returns true if this map contains no key-value mappings.
 Set<String> keySet()
          Returns a Set view of the keys contained in this map.
 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).
 int size()
          Returns the number of key-value mappings in this map.
 Collection<Object> values()
          Returns a Collection view of the values contained in this map.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface java.util.Map
equals, hashCode
 

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 Map<String,Object>
Specified by:
put in interface Bindings
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 Map<String,Object>
Specified by:
putAll in interface Bindings
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.

clear

public void clear()
Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.

Specified by:
clear in interface Map<String,Object>

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 Map<String,Object>
Specified by:
containsKey in interface Bindings
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

containsValue

public boolean containsValue(Object value)
Returns true if this map maps one or more keys to the specified value. More formally, returns true if and only if this map contains at least one mapping to a value v such that (value==null ? v==null : value.equals(v)). This operation will probably require time linear in the map size for most implementations of the Map interface.

Specified by:
containsValue in interface Map<String,Object>
Parameters:
value - value whose presence in this map is to be tested
Returns:
true if this map maps one or more keys to the specified value

entrySet

public Set<Map.Entry<String,Object>> entrySet()
Returns a Set view of the mappings contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation, or through the setValue operation on a map entry returned by the iterator) the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.

Specified by:
entrySet in interface Map<String,Object>
Returns:
a set view of the mappings contained in this map

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 Map<String,Object>
Specified by:
get in interface Bindings
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

isEmpty

public boolean isEmpty()
Returns true if this map contains no key-value mappings.

Specified by:
isEmpty in interface Map<String,Object>
Returns:
true if this map contains no key-value mappings

keySet

public Set<String> keySet()
Returns a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa. If the map is modified while an iteration over the set is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.

Specified by:
keySet in interface Map<String,Object>
Returns:
a set view of the keys contained in this map

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 Map<String,Object>
Specified by:
remove in interface Bindings
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

size

public int size()
Returns the number of key-value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.

Specified by:
size in interface Map<String,Object>
Returns:
the number of key-value mappings in this map

values

public Collection<Object> values()
Returns a Collection view of the values contained in this map. The collection is backed by the map, so changes to the map are reflected in the collection, and vice-versa. If the map is modified while an iteration over the collection is in progress (except through the iterator's own remove operation), the results of the iteration are undefined. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll and clear operations. It does not support the add or addAll operations.

Specified by:
values in interface Map<String,Object>
Returns:
a collection view of the values contained in this map

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