Package com.mckoi.database
Class CollatedBaseSearch
- java.lang.Object
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- com.mckoi.database.SelectableScheme
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- com.mckoi.database.CollatedBaseSearch
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- Direct Known Subclasses:
InsertSearch
public abstract class CollatedBaseSearch extends SelectableScheme
An implementation of SelectableScheme that is based on some collated set of data. This can be used to implement more advanced types of selectable schemes based on presistant indexes (see InsertSearch).The default implementation maintains no state,
Derived classes are required to implement 'copy', 'searchFirst' and 'searchLast' methods. With these basic methods, a selectable scheme can be generated provided the column is sorted in ascending order (value of row i is <= value of row i+1). Overwrite 'firstInCollationOrder', 'lastInCollationOrder' and 'addRangeToSet' methods for non sorted underlying sets.
Assumptions - the underlying column is sorted low to high (value of row i is <= value of row i+1).
- Author:
- Tobias Downer
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Field Summary
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Fields inherited from class com.mckoi.database.SelectableScheme
EMPTY_LIST, ONE_LIST
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Constructor Summary
Constructors Constructor Description CollatedBaseSearch(TableDataSource table, int column)
The Constructor.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description protected IntegerVector
addRangeToSet(int start, int end, IntegerVector ivec)
Adds the set indexes to the list that represent the range of values between the start (inclusive) and end offset (inclusive) given.void
dispose()
Disposes and invalidates the BlindSearch.protected TObject
firstInCollationOrder()
Returns the first value of this column (in collated order).void
insert(int row)
This scheme doesn't take any notice of insertions or removals.protected TObject
lastInCollationOrder()
Returns the last value of this column (in collated order).void
readFrom(java.io.InputStream in)
Reads the entire state of the scheme from the input stream.void
remove(int row)
This scheme doesn't take any notice of insertions or removals.protected abstract int
searchFirst(TObject val)
Finds the position in the collated set of the first value in the column equal to the given value.protected abstract int
searchLast(TObject val)
Finds the position in the collated set of the last value in the column equal to the given value.IntegerVector
selectAll()
These are the select operations that are the main purpose of the scheme.IntegerVector
selectRange(SelectableRange range)
IntegerVector
selectRange(SelectableRange[] ranges)
protected int
setSize()
The size of the set (the number of rows in this column).void
writeTo(java.io.OutputStream out)
Writes the entire state of the scheme to the output stream.-
Methods inherited from class com.mckoi.database.SelectableScheme
copy, Debug, getCellContents, getColumn, getSubsetScheme, getSystem, getTable, internalOrderIndexSet, isImmutable, selectAllNonNull, selectBetween, selectEqual, selectFirst, selectGreater, selectGreaterOrEqual, selectLast, selectLess, selectLessOrEqual, selectNotEqual, selectNotFirst, selectNotLast, setImmutable, toString
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Constructor Detail
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CollatedBaseSearch
public CollatedBaseSearch(TableDataSource table, int column)
The Constructor.
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Method Detail
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insert
public void insert(int row)
This scheme doesn't take any notice of insertions or removals.
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remove
public void remove(int row)
This scheme doesn't take any notice of insertions or removals.
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readFrom
public void readFrom(java.io.InputStream in) throws java.io.IOException
Reads the entire state of the scheme from the input stream. This is a trivial case for BlindSearch which doesn't require any data to be stored.- Specified by:
readFrom
in classSelectableScheme
- Throws:
java.io.IOException
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writeTo
public void writeTo(java.io.OutputStream out) throws java.io.IOException
Writes the entire state of the scheme to the output stream. This is a trivial case for BlindSearch which doesn't require any data to be stored.- Specified by:
writeTo
in classSelectableScheme
- Throws:
java.io.IOException
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dispose
public void dispose()
Disposes and invalidates the BlindSearch.- Specified by:
dispose
in classSelectableScheme
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searchFirst
protected abstract int searchFirst(TObject val)
Finds the position in the collated set of the first value in the column equal to the given value. If the value is not to be found in the column, it returns -(insert_position + 1).
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searchLast
protected abstract int searchLast(TObject val)
Finds the position in the collated set of the last value in the column equal to the given value. If the value is not to be found in the column, it returns -(insert_position + 1).
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setSize
protected int setSize()
The size of the set (the number of rows in this column).
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firstInCollationOrder
protected TObject firstInCollationOrder()
Returns the first value of this column (in collated order). For example, if the column contains (1, 4, 8} then '1' is returned.
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lastInCollationOrder
protected TObject lastInCollationOrder()
Returns the last value of this column (in collated order). For example, if the column contains (1, 4, 8} then '8' is returned.
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addRangeToSet
protected IntegerVector addRangeToSet(int start, int end, IntegerVector ivec)
Adds the set indexes to the list that represent the range of values between the start (inclusive) and end offset (inclusive) given.
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selectAll
public IntegerVector selectAll()
Description copied from class:SelectableScheme
These are the select operations that are the main purpose of the scheme. They retrieve the given information from the set. Different schemes will have varying performance on different types of data sets. The select operations must *always* return a resultant row set that is sorted from lowest to highest.- Overrides:
selectAll
in classSelectableScheme
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selectRange
public IntegerVector selectRange(SelectableRange range)
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selectRange
public IntegerVector selectRange(SelectableRange[] ranges)
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