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java.lang.Objectrelop.Iterator
relop.IndexScan
public class IndexScan
Wrapper for bucket scan, an index access method.
Field Summary |
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Fields inherited from class relop.Iterator |
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schema |
Constructor Summary | |
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IndexScan(Schema schema,
HashIndex index,
HeapFile file)
Constructs an index scan, given the hash index and schema. |
Method Summary | |
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void |
close()
Closes the iterator, releasing any resources (i.e. |
void |
explain(int depth)
Gives a one-line explaination of the iterator, repeats the call on any child iterators, and increases the indent depth along the way. |
SearchKey |
getLastKey()
Gets the key of the last tuple returned. |
Tuple |
getNext()
Gets the next tuple in the iteration. |
int |
getNextHash()
Returns the hash value for the bucket containing the next tuple, or maximum number of buckets if none. |
boolean |
hasNext()
Returns true if there are more tuples, false otherwise. |
boolean |
isOpen()
Returns true if the iterator is open; false otherwise. |
void |
restart()
Restarts the iterator, i.e. |
Methods inherited from class relop.Iterator |
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execute, finalize, indent |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public IndexScan(Schema schema, HashIndex index, HeapFile file)
Method Detail |
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public void explain(int depth)
explain
in class Iterator
public void restart()
restart
in class Iterator
public boolean isOpen()
isOpen
in class Iterator
public void close()
close
in class Iterator
public boolean hasNext()
hasNext
in class Iterator
public Tuple getNext()
getNext
in class Iterator
java.lang.IllegalStateException
- if no more tuplespublic SearchKey getLastKey()
public int getNextHash()
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