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java.lang.Objectgoldman.collection.AbstractCollection.AbstractLocator<E>
goldman.collection.priority.BinaryHeap.BinaryHeapLocator
public class BinaryHeap.BinaryHeapLocator
Field Summary |
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Fields inherited from class goldman.collection.AbstractCollection.AbstractLocator |
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versionNumber |
Constructor Summary | |
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protected |
BinaryHeap.BinaryHeapLocator(PositionalCollectionLocator<E> loc)
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Method Summary | |
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boolean |
advance()
Moves the locator to the next element in the iteration order (or {\texttt AFT} if it is currently at the last element). |
void |
decreasePriority(E element)
Replaces the tracked element by element
REQUIRES: the given parameter is less than e, or that e is the parameter being passed and its value has been mutated to have a lower priority than it had previously. |
E |
get()
Returns the element associated with this locator. |
boolean |
hasNext()
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boolean |
inCollection()
Returns true if and only if the locator is at an element of the collection. |
void |
increasePriority(E element)
Replaces the tracked element by element
REQUIRES: the given parameter is greater than e, or that e is the parameter being passed and its value has been mutated to have a higher priority than it had previously. |
void |
remove()
Removes the element at the locator position, and updates the locator to be at the element in the iteration order that preceded the one removed. |
boolean |
retreat()
Moves the locator to the previous element in the iteration order (or FORE if it is currently at the first element). |
void |
update(E element)
Replaces the element associated with this priority queue locator by the given element. |
Methods inherited from class goldman.collection.AbstractCollection.AbstractLocator |
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checkValidity, ignoreConcurrentModifications, ignorePriorConcurrentModifications, next, updateVersion |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface goldman.collection.Locator |
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ignoreConcurrentModifications, ignorePriorConcurrentModifications |
Methods inherited from interface java.util.Iterator |
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next |
Constructor Detail |
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protected BinaryHeap.BinaryHeapLocator(PositionalCollectionLocator<E> loc)
loc
- a reference to the node to place the locator.Method Detail |
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public boolean inCollection()
Locator
inCollection
in interface Locator<E>
public E get()
Locator
inCollection
method can be
used to determine if a tracked element is currently in the collection.
If the locator is at FORE or AFT then
a NoSuchElementException
is thrown.
get
in interface Locator<E>
NoSuchElementException
- locator is not at an element in
the collection.public boolean advance()
advance
in interface Locator<E>
AtBoundaryException
- the locator is at AFT since there is
no place to advance.public boolean retreat()
retreat
in interface Locator<E>
AtBoundaryException
- the locator is at FORE since then there is
no place to retreat.public boolean hasNext()
hasNext
in interface Iterator<E>
public void update(E element)
PriorityQueueLocator
update
in interface PriorityQueueLocator<E>
element
- the new element to replace the
one at the locator positionpublic void increasePriority(E element)
element
increasePriority
in interface PriorityQueueLocator<E>
public void decreasePriority(E element)
element
decreasePriority
in interface PriorityQueueLocator<E>
public void remove()
remove
in interface Iterator<E>
NoSuchElementException
- called on a locator at FORE or AFT
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