Oracle Fusion Middleware C++ API Reference for Oracle Coherence: SafeHashMap::Entry Class Reference

The Map.entrySet method returns a collection-view of the map, whose elements are of this class.

Public Types

typedef spec::Handle Handle

Entry Handle definition.

typedef spec::View View

Entry View definition.

typedef spec::Holder Holder

Entry Holder definition.

Public Member Functions

virtual bool isKeyEqual (Object::View vKey) const

Return true if the supplied key is equal to the entries key.

virtual Object::View getKey () const

virtual Object::Holder getValue () const

virtual Object::Holder getValue ()

virtual Object::Holder setValue (Object::Holder ohValue)

virtual void onAdd ()

This method is invoked when the containing Map has actually added this Entry to itself.

virtual bool equals (Object::View vThat) const

virtual size32_t hashCode () const

Return a hash code value for the Object.

This method is supported for the benefit of hash-based containers.

The general contract of hashCode is:

Whenever it is invoked on the same Object more than once during an execution of an application, the hashCode method must consistently return the same value, provided no information used in equals comparisons on the object is modified. This value need not remain consistent from one execution of an application to another execution of the same application.
If two Objects are equal according to the equals method, then calling the hashCode method on each of the two Objects must produce the same value.
It is not required that if two Objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct results. However, the programmer should be aware that producing distinct results for unequal objects may improve the performance of hash-based containers.

The default implementation is identity based.

Returns:: a hash code value for this Object

virtual void toStream (std::ostream &out) const

Output a human-readable description of this Object to the given stream.

coherence::lang::operator<<(std::ostream, Object::View) is defined and will call into the toStream method, to output Objects. If a managed String object is desired, the COH_TO_STRING macro can be used to build up a String from streamable contents.

 Object::View vKey   = ...
 Object::View vValue = ...
 std::cout << vKey << " = " << vValue << std::endl;

 String::Handle hs = COH_TO_STRING(vKey << " = " << vValue);

Parameters:

out

the stream used to output the description

Protected Member Functions

Entry (Object::View vKey, Object::Holder ohValue, size32_t nHash)

Create a new Map::Entry.

Entry (const Entry &that)

Copy Constructor.

Entry (Entry::View vThat)

Instantiate an Entry shallow copying the key and value from the Entry provided.

Protected Attributes

FinalView< Object > f_vKey

The key.

MemberHolder< Object > m_ohValue

The value.

const size32_t m_nHash

The key's hash code.

MemberHandle< Entry > m_hNext

The next entry in the linked list (an open hashing implementation).

Constructor & Destructor Documentation

Entry	(	Object::View	vKey,
		Object::Holder	ohValue,
		size32_t	nHash
	)			`[protected]`

Create a new Map::Entry.

Parameters:

	vKey	the assocaited key
	ohValue	the associated value
	hHash	the associated hash code

Returns:: a new Map::Entry

Entry ( Entry::View vThat ) [protected]

Instantiate an Entry shallow copying the key and value from the Entry provided.

Parameters:

vThat

the entry to copy from

Member Data Documentation

MemberHolder<Object> m_ohValue [protected]

The value.

This object reference can change within the life of the Entry.

const size32_t m_nHash [protected]

The key's hash code.

This value will not change for the life of the Entry.

SafeHashMap::Entry Class Reference

Detailed Description

Public Types

Public Member Functions

Protected Member Functions

Protected Attributes

Constructor & Destructor Documentation

Member Data Documentation