public boolean containsKey(String key)
Returns true if and only if this CompositeData instance contains
an item whose name is key.
If key is a null or empty String, this method simply returns false.

 public boolean containsValue(Object value)
Returns true if and only if this CompositeData instance contains an item
whose value is value.

 public boolean equals(Object obj)
Compares the specified obj parameter with this
CompositeData instance for equality.

Returns true if and only if all of the following statements are true:

obj is non null,
obj also implements the CompositeData interface,
their composite types are equal
their contents, i.e. (name, value) pairs are equal. If a value contained in
the content is an array, the value comparison is done as if by calling
the  deepEquals  method
for arrays of object reference types or the appropriate overloading of
{@code Arrays.equals(e1,e2)} for arrays of primitive types


This ensures that this equals method works properly for
obj parameters which are different implementations of the
CompositeData interface, with the restrictions mentioned in the
 equals 
method of the java.util.Collection interface.

 public Object get(String key)
Returns the value of the item whose name is key.

 public Object[] getAll(String[] keys)
Returns an array of the values of the items whose names are specified by keys, in the same order as keys.

 public CompositeType getCompositeType()
Returns the composite type  of this composite data instance.

 public int hashCode()
Returns the hash code value for this CompositeData instance.

The hash code of a CompositeData instance is the sum of the hash codes
of all elements of information used in equals comparisons
(ie: its composite type and all the item values).

This ensures that  t1.equals(t2)  implies that  t1.hashCode()==t2.hashCode() 
for any two CompositeData instances t1 and t2,
as required by the general contract of the method
Object.hashCode() .

Each item value's hash code is added to the returned hash code.
If an item value is an array,
its hash code is obtained as if by calling the
 deepHashCode  method
for arrays of object reference types or the appropriate overloading
of {@code Arrays.hashCode(e)} for arrays of primitive types.

 public String toString()
Returns a string representation of this CompositeData instance.

The string representation consists of the name of the implementing class,
the string representation of the composite type of this instance, and the string representation of the contents
(ie list the itemName=itemValue mappings).

 public Collection<?> values()
Returns an unmodifiable Collection view of the item values contained in this CompositeData instance.
The returned collection's iterator will return the values in the ascending lexicographic order of the corresponding
item names.