IT. Expert System.

Java Standard Edition (SE)

SimpleBindings


compact1, compact2, compact3
javax.script

Class 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
    • 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

      • 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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