Package uk.ac.starlink.ttools.plot2.data
Interface CachedReader
public interface CachedReader
Accessor for stored values.
Although several data type accessor methods are provided,
in general for a given instance of this class only one of these will
give a non-error return (the same one for all rows); it is therefore
the responsibility of the user of an instance of this class to
keep track of what type is appropriate, since Java's type system
will not enforce it. Attempting to retrieve the wrong type of data
will give a result (it must not throw an exception), but this
result may not be meaningful.
This non-type-safe arrangement is used so that primitive objects can
be accessed from this interface.
Attempting to access a value with an index out of range for this reader will also result in undefined behaviour.
- Since:
- 25 Apr 2017
- Author:
- Mark Taylor
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Method Summary
Modifier and TypeMethodDescriptionboolean
getBooleanValue
(long ix) Retrieve the value at a given index as a boolean value.double
getDoubleValue
(long ix) Retrieve the value at a given index as a floating point number.int
getIntValue
(long ix) Retrieve the value at a given index as an integer.long
getLongValue
(long ix) Retrieve the value at a given index a long.getObjectValue
(long ix) Retrieve the value at a given index as an object.
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Method Details
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getObjectValue
Retrieve the value at a given index as an object. Note it is permitted for the same instance to be returned each time, if the object is mutable it may have different values each time (for instance an array with different contents for each row). Therefore the state or contents of the returned object must not be relied on to stay the same between calls to this method.- Parameters:
ix
- value index- Returns:
- value
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getDoubleValue
double getDoubleValue(long ix) Retrieve the value at a given index as a floating point number.- Parameters:
ix
- value index- Returns:
- value
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getIntValue
int getIntValue(long ix) Retrieve the value at a given index as an integer.- Parameters:
ix
- value index- Returns:
- value
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getLongValue
long getLongValue(long ix) Retrieve the value at a given index a long.- Parameters:
ix
- value index- Returns:
- value
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getBooleanValue
boolean getBooleanValue(long ix) Retrieve the value at a given index as a boolean value.- Parameters:
ix
- value index- Returns:
- value
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