Class SimpleBindings

engine/javax-src/javax/script/SimpleBindings.java:23–149

A simple implementation of Bindings backed by a HashMap or some other specified Map . @author Mike Grogan @version 1.0 @since 1.6

 * @since 1.6
 */
public class SimpleBindings implements Bindings {

    /**
     * The <code>Map</code> field stores the attributes.
     */
    private Map<String,Object> map;
    
    /**
     * Constructor uses an existing <code>Map</code> to store the values.
     * @param m The <code>Map</code> backing this <code>SimpleBindings</code>.
     * @throws NullPointerException if m is null
     */
    public SimpleBindings(Map<String,Object> m) {
        if (m == null) {
            throw new NullPointerException();
        }
        this.map = m;
    }
    
    /**
     * Default constructor uses a <code>HashMap</code>.
     */
    public SimpleBindings() {
        this(new HashMap<String,Object>());
    }

    /**
     * Sets the specified key/value in the underlying <code>map</code> field.
     *
     * @param name Name of value
     * @param value Value to set.
     *
     * @return Previous value for the specified key.  Returns null if key was previously 
     * unset.
     *
     * @throws <code>NullPointerException</code> if the name is null.
     * @throws <code>IllegalArgumentException</code> if the name is empty.
     */
    public Object put(String name, Object value) {
        checkKey(name);
        map.put(name,value);
        return value;
    }
    
    /**
     * <code>putAll</code> is implemented using <code>Map.putAll</code>.
     *
     * @param toMerge The <code>Map</code> of values to add.
     *
     * @throws <code>NullPointerException</code> if some key in the specified <code>Map</code>
     * is null.
     * @throws <code>IllegalArgumentException</code> if some key in the specified <code>Map</code> is empty String.
     */
    public void putAll(Map<? extends String, ? extends Object> toMerge) {
        for (Map.Entry<? extends String, ? extends Object> entry : toMerge.entrySet()) { 
            String key = entry.getKey();
            checkKey(key);
            put(key, entry.getValue());