Interface CompositeData
- All Known Implementing Classes:
-
CompositeDataSupport
,GcInfo
public interface CompositeData
The CompositeData
interface specifies the behavior of a specific type of complex open data objects which represent composite data structures.
- Since:
- 1.5
Method Summary
Modifier and Type | Method | Description |
---|---|---|
boolean | containsKey(String key) | Returns |
boolean | containsValue(Object value) | Returns |
boolean | equals(Object obj) | Compares the specified obj parameter with this |
Object | get(String key) | Returns the value of the item whose name is |
Object[] | getAll(String[] keys) | Returns an array of the values of the items whose names are specified by |
CompositeType | getCompositeType() | Returns the composite type of this composite data instance. |
int | hashCode() | Returns the hash code value for this |
String | toString() | Returns a string representation of this |
Collection<?> | values() | Returns an unmodifiable Collection view of the item values contained in this |
Method Detail
getCompositeType
CompositeType getCompositeType()
Returns the composite type of this composite data instance.
- Returns:
- the type of this CompositeData.
get
Object get(String key)
Returns the value of the item whose name is key
.
- Parameters:
-
key
- the name of the item. - Returns:
- the value associated with this key.
- Throws:
-
IllegalArgumentException
- ifkey
is a null or empty String. -
InvalidKeyException
- ifkey
is not an existing item name for thisCompositeData
instance.
getAll
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
.
- Parameters:
-
keys
- the names of the items. - Returns:
- the values corresponding to the keys.
- Throws:
-
IllegalArgumentException
- if an element inkeys
is a null or empty String. -
InvalidKeyException
- if an element inkeys
is not an existing item name for thisCompositeData
instance.
containsKey
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.
- Parameters:
-
key
- the key to be tested. - Returns:
- true if this
CompositeData
contains the key.
containsValue
boolean containsValue(Object value)
Returns true
if and only if this CompositeData
instance contains an item whose value is value
.
- Parameters:
-
value
- the value to be tested. - Returns:
- true if this
CompositeData
contains the value.
values
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.
- Returns:
- the values.
equals
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 ofArrays.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.
- Overrides:
-
equals
in classObject
- Parameters:
-
obj
- the object to be compared for equality with thisCompositeData
instance. - Returns:
-
true
if the specified object is equal to thisCompositeData
instance. - See Also:
-
Object.hashCode()
,HashMap
hashCode
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 Arrays.hashCode(e)
for arrays of primitive types.
- Overrides:
-
hashCode
in classObject
- Returns:
- the hash code value for this
CompositeData
instance - See Also:
-
Object.equals(java.lang.Object)
,System.identityHashCode(java.lang.Object)
toString
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).