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package javax.script;
import java.util.Map;


A mapping of key/value pairs, all of whose keys are Strings. 
Author:Mike Grogan
Since:1.6
/**
 * A mapping of key/value pairs, all of whose keys are
 * {@code Strings}.
 *
 * @author Mike Grogan
 * @since 1.6
 */
public interface Bindings extends Map<String, Object> {
    
Set a named value.

Params:
  • name – The name associated with the value.
  • value – The value associated with the name.
Throws:
Returns:The value previously associated with the given name.
Returns null if no value was previously associated with the name.
/**
     * Set a named value.
     *
     * @param name The name associated with the value.
     * @param value The value associated with the name.
     *
     * @return The value previously associated with the given name.
     * Returns null if no value was previously associated with the name.
     *
     * @throws NullPointerException if the name is null.
     * @throws IllegalArgumentException if the name is empty String.
     */
    public Object put(String name, Object value);

    
Adds all the mappings in a given Map to this Bindings. 
Params:
  • toMerge – The Map to merge with this one.
Throws:
/**
     * Adds all the mappings in a given {@code Map} to this {@code Bindings}.
     * @param toMerge The {@code Map} to merge with this one.
     *
     * @throws NullPointerException
     *         if toMerge map is null or if some key in the map is null.
     * @throws IllegalArgumentException
     *         if some key in the map is an empty String.
     */
    public void putAll(Map<? extends String, ? extends Object> toMerge);

    
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.) 
Params:
  • key – key whose presence in this map is to be tested.
Throws:
Returns:true if this map contains a mapping for the specified key.
/**
     * Returns {@code true} if this map contains a mapping for the specified
     * key.  More formally, returns {@code true} if and only if
     * this map contains a mapping for a key {@code k} such that
     * {@code (key==null ? k==null : key.equals(k))}.  (There can be
     * at most one such mapping.)
     *
     * @param key key whose presence in this map is to be tested.
     * @return {@code true} if this map contains a mapping for the specified
     *         key.
     *
     * @throws NullPointerException if key is null
     * @throws ClassCastException if key is not String
     * @throws IllegalArgumentException if key is empty String
     */
    public boolean containsKey(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.) 
Params:
  • key – key whose associated value is to be returned.
Throws:
Returns:the value to which this map maps the specified key, or null if the map contains no mapping for this key.
/**
     * Returns the value to which this map maps the specified key.  Returns
     * {@code null} if the map contains no mapping for this key.  A return
     * value of {@code null} does not <i>necessarily</i> indicate that the
     * map contains no mapping for the key; it's also possible that the map
     * explicitly maps the key to {@code null}.  The {@code containsKey}
     * operation may be used to distinguish these two cases.
     *
     * <p>More formally, if this map contains a mapping from a key
     * {@code k} to a value {@code v} such that
     * {@code (key==null ? k==null : key.equals(k))},
     * then this method returns {@code v}; otherwise
     * it returns {@code null}.  (There can be at most one such mapping.)
     *
     * @param key key whose associated value is to be returned.
     * @return the value to which this map maps the specified key, or
     *         {@code null} if the map contains no mapping for this key.
     *
     * @throws NullPointerException if key is null
     * @throws ClassCastException if key is not String
     * @throws IllegalArgumentException if key is empty String
     */
    public Object get(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. 
Params:
  • key – key whose mapping is to be removed from the map.
Throws:
Returns:previous value associated with specified key, or null if there was no mapping for 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 {@code k} to value {@code v} such that
     * {@code (key==null ?  k==null : key.equals(k))}, that mapping
     * is removed.  (The map can contain at most one such mapping.)
     *
     * <p>Returns the value to which the map previously associated the key, or
     * {@code null} if the map contained no mapping for this key.  (A
     * {@code null} return can also indicate that the map previously
     * associated {@code null} with the specified key if the implementation
     * supports {@code null} values.)  The map will not contain a mapping for
     * the specified  key once the call returns.
     *
     * @param key key whose mapping is to be removed from the map.
     * @return previous value associated with specified key, or {@code null}
     *         if there was no mapping for key.
     *
     * @throws NullPointerException if key is null
     * @throws ClassCastException if key is not String
     * @throws IllegalArgumentException if key is empty String
     */
    public Object remove(Object key);
}