Package uk.ac.starlink.array
Class ReorderingMapper
- java.lang.Object
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- uk.ac.starlink.array.ReorderingMapper
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- All Implemented Interfaces:
OffsetMapper
public class ReorderingMapper extends java.lang.Object implements OffsetMapper
Implements the OffsetMapper interface to map between arrays with the same shape but different ordering schemes.- Author:
- Mark Taylor (Starlink)
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Constructor Summary
Constructors Constructor Description ReorderingMapper(NDShape shape, Order order1, Order order2)
Constructs an OffsetMapper which maps between two arrays with the same shape but different pixel sequences.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description long
mapOffset(long off1)
Returns an offset into array 2 corresponding to a given offset in array 1.long[]
mapRange(long[] range1)
Returns a two-element array (min,max) indicating the range of mapping output values (array 2 offsets) which correspond to a given range of input values (array 1 offsets).
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Constructor Detail
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ReorderingMapper
public ReorderingMapper(NDShape shape, Order order1, Order order2)
Constructs an OffsetMapper which maps between two arrays with the same shape but different pixel sequences.- Parameters:
shape
- the common shape of the two arraysorder1
- the ordering scheme of array 1order2
- the ordering scheme of array 2
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Method Detail
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mapOffset
public long mapOffset(long off1)
Description copied from interface:OffsetMapper
Returns an offset into array 2 corresponding to a given offset in array 1. Any long value may be returned, though depending on the the size of array 2 it may not fall within its bounds. A negative value always corresponds to a pixel which does not exist in array 2. It is the responsibility of clients of this OffsetMapper to cope with such out-of-bounds return values sensibly.- Specified by:
mapOffset
in interfaceOffsetMapper
- Parameters:
off1
- the offset into the array 1 giving a pixel position- Returns:
- the offset into array 2 giving the position of the corresponding pixel off1 into array 1
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mapRange
public long[] mapRange(long[] range1)
Description copied from interface:OffsetMapper
Returns a two-element array (min,max) indicating the range of mapping output values (array 2 offsets) which correspond to a given range of input values (array 1 offsets). The return value constitutes a guarantee thatOffsetMapper.mapOffset(long)
will not return any value outside of the range returned, as long as no value outside of the supplied range parameter is not supplied to it. The returned range is only used for efficiency purposes and may be conservative (a larger range than will actually be returned). A null value may be returned; this, like a return value of {-Long.MIN_VALUE,Long.MAX_VALUE} constitutes no guarantee about the mapping output values.- Specified by:
mapRange
in interfaceOffsetMapper
- Parameters:
range1
- a two-element array giving the lowest value and highest value (inclusive) which will be supplied to the mapOffset method (range to be considered in array 1)- Returns:
- a two-element array giving the lowest value and highest value (inclusive) which could be returned by the mapOffset method (range which could be returned in array 2) under the above circumstances. May be null if the information is not available
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