Package gnu.trove.iterator
Interface TByteObjectIterator<V>
- All Superinterfaces:
TAdvancingIterator
,TIterator
Iterator for maps of type byte and Object.
The iterator semantics for Trove's primitive maps is slightly different
from those defined in java.util.Iterator, but still well within
the scope of the pattern, as defined by Gamma, et al.
This iterator does not implicitly advance to the next entry when
the value at the current position is retrieved. Rather, you must explicitly
ask the iterator to advance() and then retrieve either the key(),
the value() or both. This is done so that you have the option, but not
the obligation, to retrieve keys and/or values as your application requires, and
without introducing wrapper objects that would carry both. As the iteration is
stateful, access to the key/value parts of the current map entry happens in
constant time.
In practice, the iterator is akin to a "search finger" that you move from
position to position. Read or write operations affect the current entry only and
do not assume responsibility for moving the finger.
Here are some sample scenarios for this class of iterator:
// accessing keys/values through an iterator: for ( TByteObjectIterator it = map.iterator(); it.hasNext(); ) { it.advance(); if ( satisfiesCondition( it.key() ) ) { doSomethingWithValue( it.value() ); } }
// modifying values in-place through iteration: for ( TByteObjectIterator it = map.iterator(); it.hasNext(); ) { it.advance(); if ( satisfiesCondition( it.key() ) ) { it.setValue( newValueForKey( it.key() ) ); } }
// deleting entries during iteration: for ( TByteObjectIterator it = map.iterator(); it.hasNext(); ) { it.advance(); if ( satisfiesCondition( it.key() ) ) { it.remove(); } }
// faster iteration by avoiding hasNext(): TByteObjectIterator iterator = map.iterator(); for ( int i = map.size(); i-- > 0; ) { iterator.advance(); doSomethingWithKeyAndValue( iterator.key(), iterator.value() ); }
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Method Summary
Methods inherited from interface gnu.trove.iterator.TAdvancingIterator
advance
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Method Details
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key
byte key()Provides access to the key of the mapping at the iterator's position. Note that you must advance() the iterator at least once before invoking this method.- Returns:
- the key of the entry at the iterator's current position.
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value
V value()Provides access to the value of the mapping at the iterator's position. Note that you must advance() the iterator at least once before invoking this method.- Returns:
- the value of the entry at the iterator's current position.
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setValue
Replace the value of the mapping at the iterator's position with the specified value. Note that you must advance() the iterator at least once before invoking this method.- Parameters:
val
- the value to set in the current entry- Returns:
- the old value of the entry.
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