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EmptyMapIterator - JBoss RULES 3.0.6 API 英文版文档

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org.drools.util
Class EmptyMapIterator

java.lang.Object
  org.drools.util.EmptyMapIterator

All Implemented Interfaces:

java.util.Iterator, MapIterator

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public class EmptyMapIterator
extends java.lang.Object
implements MapIterator

Provides an implementation of an empty map iterator.

Since:

Commons Collections 3.1

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Field Summary
static MapIterator	INSTANCE           Singleton instance of the iterator.

 

Constructor Summary
protected	EmptyMapIterator()           Constructor.

 

Method Summary
void	add(java.lang.Object obj)
java.lang.Object	getKey()           Gets the current key, which is the key returned by the last call to next().
java.lang.Object	getValue()           Gets the current value, which is the value associated with the last key returned by next().
boolean	hasNext()           Checks to see if there are more entries still to be iterated.
boolean	hasPrevious()
java.lang.Object	next()           Gets the next key from the Map.
int	nextIndex()
java.lang.Object	previous()
int	previousIndex()
void	remove()           Removes the last returned key from the underlying Map (optional operation).
void	reset()
void	set(java.lang.Object obj)
java.lang.Object	setValue(java.lang.Object value)           Sets the value associated with the current key (optional operation).

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

INSTANCE

public static final MapIterator INSTANCE

Singleton instance of the iterator.

Since:

Commons Collections 3.1

Constructor Detail

EmptyMapIterator

protected EmptyMapIterator()

Constructor.

Method Detail

hasNext

public boolean hasNext()

Description copied from interface: MapIterator

Checks to see if there are more entries still to be iterated.

Specified by:

hasNext in interface java.util.Iterator

Specified by:

hasNext in interface MapIterator

Returns:

true if the iterator has more elements

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next

public java.lang.Object next()

Description copied from interface: MapIterator

Gets the next key from the Map.

Specified by:

next in interface java.util.Iterator

Specified by:

next in interface MapIterator

Returns:

the next key in the iteration

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hasPrevious

public boolean hasPrevious()

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previous

public java.lang.Object previous()

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nextIndex

public int nextIndex()

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previousIndex

public int previousIndex()

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add

public void add(java.lang.Object obj)

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set

public void set(java.lang.Object obj)

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remove

public void remove()

Description copied from interface: MapIterator

Removes the last returned key from the underlying Map (optional operation).

This method can be called once per call to next().

Specified by:

remove in interface java.util.Iterator

Specified by:

remove in interface MapIterator

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getKey

public java.lang.Object getKey()

Description copied from interface: MapIterator

Gets the current key, which is the key returned by the last call to next().

Specified by:

getKey in interface MapIterator

Returns:

the current key

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getValue

public java.lang.Object getValue()

Description copied from interface: MapIterator

Gets the current value, which is the value associated with the last key returned by next().

Specified by:

getValue in interface MapIterator

Returns:

the current value

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setValue

public java.lang.Object setValue(java.lang.Object value)

Description copied from interface: MapIterator

Sets the value associated with the current key (optional operation).

Specified by:

setValue in interface MapIterator

Parameters:

value - the new value

Returns:

the previous value

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reset

public void reset()

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